# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1674593811 -3600
# Node ID 5616c5b75dcdc2c4e7994d56c71eab2ce73d3512
# Parent  d35594a45cbb2f580d7a503ed2c490ba29bb167b
Added decoupling capacitors and missing power units.

diff -r d35594a45cbb -r 5616c5b75dcd AcornElectronMainboard.pro
--- a/AcornElectronMainboard.pro	Mon Jan 23 00:37:25 2023 +0100
+++ b/AcornElectronMainboard.pro	Tue Jan 24 21:56:51 2023 +0100
@@ -1,4 +1,4 @@
-update=22/05/2015 07:44:53
+update=Tue 24 Jan 2023 21:57:29 CET
 version=1
 last_client=kicad
 [general]
@@ -31,3 +31,13 @@
 version=1
 LibDir=
 [eeschema/libraries]
+[schematic_editor]
+version=1
+PageLayoutDescrFile=
+PlotDirectoryName=
+SubpartIdSeparator=0
+SubpartFirstId=65
+NetFmtName=
+SpiceAjustPassiveValues=0
+LabSize=50
+ERC_TestSimilarLabels=1
diff -r d35594a45cbb -r 5616c5b75dcd AcornElectronMainboard.sch
--- a/AcornElectronMainboard.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/AcornElectronMainboard.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
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-Sheet 1 9
+Sheet 1 10
 Title "Acorn Electron Mainboard"
 Date ""
 Rev ""
@@ -239,29 +239,6 @@
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 	2200 3500 2900 3500
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-U 1 1 61CF9DF4
-P 1400 8900
-F 0 "PL3" H 1320 9217 50  0000 C CNN
-F 1 "Power" H 1320 9126 50  0000 C CNN
-F 2 "" H 1400 8900 50  0001 C CNN
-F 3 "~" H 1400 8900 50  0001 C CNN
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-	-1   0    0    -1  
-$EndComp
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-Wire Wire Line
-	1800 9800 2000 9800
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@@ -332,121 +309,14 @@
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-$Comp
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-F 2 "" H 2038 9400 50  0001 C CNN
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-Connection ~ 2700 9300
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-Connection ~ 2700 8800
-$Comp
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-F 1 "Power" H 1320 10226 50  0000 C CNN
-F 2 "" H 1400 10100 50  0001 C CNN
-F 3 "~" H 1400 10100 50  0001 C CNN
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-	-1   0    0    -1  
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-0V
-Wire Wire Line
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-Text Label 1600 9000 0    50   ~ 0
--5V
-Text Label 1600 10100 0    50   ~ 0
-RETURN
-Text Label 1600 10200 0    50   ~ 0
-18VAC
 Wire Wire Line
 	4600 7600 4600 6750
 $Sheet
-S 2800 7800 700  300 
+S 2800 8300 700  300 
 U 61DF4BC2
 F0 "Clocks" 50
 F1 "clocks.sch" 50
@@ -456,7 +326,7 @@
 Text GLabel 3500 7400 0    50   Input ~ 0
 CLOCK_16MHz_DIV_13
 $Sheet
-S 1200 1100 700  300 
+S 1200 900  700  300 
 U 61D7EEE8
 F0 "RAM" 50
 F1 "RAM.sch" 50
@@ -468,7 +338,7 @@
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 RA[0..7]
 $Sheet
-S 5800 1300 700  300 
+S 6700 900  700  300 
 U 624B50A6
 F0 "Cassette" 50
 F1 "cassette.sch" 50
@@ -482,7 +352,7 @@
 Wire Wire Line
 	5600 1800 5800 1800
 $Sheet
-S 5800 4200 700  300 
+S 6700 4200 700  300 
 U 61E9B87F
 F0 "Sound" 50
 F1 "sound.sch" 50
@@ -491,20 +361,12 @@
 SOUND_OUTPUT
 Wire Wire Line
 	5600 4700 5800 4700
-Text GLabel 2600 10100 2    50   UnSpc ~ 0
-POWER_AC_RETURN
-Text GLabel 2600 10200 2    50   UnSpc ~ 0
-POWER_18VAC
-Wire Wire Line
-	1600 10100 2100 10100
-Wire Wire Line
-	1600 10200 2100 10200
 Wire Wire Line
 	3500 7600 4600 7600
 Text GLabel 1700 6400 0    50   Output ~ 0
 PHI_OUT
 $Sheet
-S 1300 7800 700  300 
+S 2800 8900 700  300 
 U 61FB7D7E
 F0 "Expansion" 50
 F1 "expansion.sch" 50
@@ -524,7 +386,7 @@
 Text GLabel 2700 3700 0    50   Input ~ 0
 ~RST
 $Sheet
-S 1300 6800 700  300 
+S 1300 8300 700  300 
 U 61F2273C
 F0 "CPU, ROM, keyboard" 50
 F1 "CPU_ROM_KBD.sch" 50
@@ -586,7 +448,7 @@
 Wire Wire Line
 	1700 6400 2900 6400
 $Sheet
-S 4800 7800 700  300 
+S 4300 8900 700  300 
 U 61DB955D
 F0 "Video" 50
 F1 "video.sch" 50
@@ -657,7 +519,7 @@
 Wire Wire Line
 	5600 2600 5800 2600
 $Sheet
-S 4800 7200 700  300 
+S 4300 8300 700  300 
 U 62411C42
 F0 "UHF" 50
 F1 "UHF.sch" 50
@@ -666,7 +528,7 @@
 	5600 6300 5800 6300
 Wire Wire Line
 	5600 5900 6000 5900
-Text Notes 5800 9150 0    50   ~ 0
+Text Notes 6100 9100 0    50   ~ 0
 Issue 6 boards tend to have\nIC19 (74LS08) fitted for\nsome kind of buffering\nof the video signals.\n\nLK7 is supposedly connected\nto +5V to ensure this.
 $Comp
 L 74xx:74LS08 IC19
@@ -712,17 +574,6 @@
 	4    6700 6700
 	1    0    0    -1  
 $EndComp
-$Comp
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-U 5 1 61E3E5E4
-P 7200 8900
-F 0 "IC19" H 7430 8946 50  0000 L CNN
-F 1 "74LS08" H 7430 8855 50  0000 L CNN
-F 2 "" H 7200 8900 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 8900 50  0001 C CNN
-	5    7200 8900
-	1    0    0    -1  
-$EndComp
 Wire Wire Line
 	5800 6300 5800 7800
 Wire Wire Line
@@ -785,21 +636,11 @@
 5V
 Wire Wire Line
 	6900 8400 6800 8400
-Text GLabel 7200 8300 1    50   Input ~ 0
-5V
-Wire Wire Line
-	7200 8300 7200 8400
-Text GLabel 7200 9500 3    50   Input ~ 0
-0V
-Wire Wire Line
-	7200 9500 7200 9400
 Text GLabel 6100 8400 0    50   Output ~ 0
 BUFFER_ENABLE
 Wire Wire Line
 	6100 8400 6200 8400
 Connection ~ 6200 8400
-Text Notes 1400 10600 0    50   ~ 0
-PL4 introduced for the two separate connections\non the original board.
 Text Label 2100 5400 2    50   ~ 0
 D[0..7]
 Text Label 2100 3800 2    50   ~ 0
@@ -824,135 +665,11 @@
 KBD2
 Text Label 2900 3500 2    50   ~ 0
 KBD3
-$Comp
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-U 1 1 62281B8F
-P 2100 10100
-F 0 "#FLG0104" H 2100 10175 50  0001 C CNN
-F 1 "PWR_FLAG" H 2100 10274 50  0000 C CNN
-F 2 "" H 2100 10100 50  0001 C CNN
-F 3 "~" H 2100 10100 50  0001 C CNN
-	1    2100 10100
-	1    0    0    -1  
-$EndComp
-Connection ~ 2100 10100
-Wire Wire Line
-	2100 10100 2600 10100
-$Comp
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-F 0 "#FLG0105" H 2100 10275 50  0001 C CNN
-F 1 "PWR_FLAG" H 2100 10373 50  0000 C CNN
-F 2 "" H 2100 10200 50  0001 C CNN
-F 3 "~" H 2100 10200 50  0001 C CNN
-	1    2100 10200
-	-1   0    0    1   
-$EndComp
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-Wire Wire Line
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 	4000 900  4000 800 
 Wire Wire Line
 	4000 1550 4000 1250
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-F 2 "" H 3500 8600 50  0001 C CNN
-F 3 "" H 3500 8600 50  0001 C CNN
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-	1    0    0    -1  
-$EndComp
-$Comp
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-F 1 "GND" H 3305 9327 50  0000 C CNN
-F 2 "" H 3300 9500 50  0001 C CNN
-F 3 "" H 3300 9500 50  0001 C CNN
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-	1    0    0    -1  
-$EndComp
-$Comp
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-F 2 "" H 3500 9600 50  0001 C CNN
-F 3 "" H 3500 9600 50  0001 C CNN
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-$EndComp
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-Connection ~ 3500 9800
-Wire Wire Line
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-F 2 "" H 3500 8700 50  0001 C CNN
-F 3 "~" H 3500 8700 50  0001 C CNN
-	1    3500 8700
-	0    -1   -1   0   
-$EndComp
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-U 1 1 61FD1D09
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-F 0 "#FLG0102" H 3500 9775 50  0001 C CNN
-F 1 "PWR_FLAG" V 3500 9828 50  0000 L CNN
-F 2 "" H 3500 9700 50  0001 C CNN
-F 3 "~" H 3500 9700 50  0001 C CNN
-	1    3500 9700
-	0    1    1    0   
-$EndComp
-$Comp
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-U 1 1 61FD8A1C
-P 3300 9400
-F 0 "#FLG0103" H 3300 9475 50  0001 C CNN
-F 1 "PWR_FLAG" V 3300 9528 50  0000 L CNN
-F 2 "" H 3300 9400 50  0001 C CNN
-F 3 "~" H 3300 9400 50  0001 C CNN
-	1    3300 9400
-	0    -1   -1   0   
-$EndComp
-Connection ~ 3300 9400
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-Connection ~ 3500 8700
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-Connection ~ 3500 9700
-Wire Wire Line
-	3500 9600 3500 9700
-$Comp
 L power:PWR_FLAG #FLG0106
 U 1 1 62024979
 P 4000 1250
@@ -984,6 +701,12 @@
 Note that KiCad gets upset\nwhen connecting passives\nto power input pins.
 Wire Bus Line
 	1700 1600 2100 1600
+$Sheet
+S 1300 8900 700  300 
+U 6460C88B
+F0 "Power" 50
+F1 "power.sch" 50
+$EndSheet
 Wire Bus Line
 	2100 1600 2100 1900
 Wire Bus Line
diff -r d35594a45cbb -r 5616c5b75dcd CPU_ROM_KBD.sch
--- a/CPU_ROM_KBD.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/CPU_ROM_KBD.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
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-Sheet 7 9
+Sheet 7 10
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@@ -20,8 +20,8 @@
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 AR Path="/61F2273C/61F22EDC" Ref="IC3"  Part="1" 
-F 0 "IC3" H 5400 5528 50  0000 C CNN
-F 1 "6502A" H 5400 5437 50  0000 C CNN
+F 0 "IC3" H 5400 5450 50  0000 C CNN
+F 1 "6502A" H 5400 5350 50  0000 C CNN
 F 2 "" H 5400 4050 50  0001 C CNN
 F 3 "" H 5400 4050 50  0001 C CNN
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@@ -148,8 +148,8 @@
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 AR Path="/61F2273C/61F22F23" Ref="IC2"  Part="1" 
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-F 1 "ROM_32K" H 3300 4500 50  0000 C CNN
+F 0 "IC2" H 3300 4500 50  0000 C CNN
+F 1 "ROM_32K" H 3300 4400 50  0000 C CNN
 F 2 "" H 3300 3700 50  0001 C CNN
 F 3 "" H 3300 3700 50  0001 C CNN
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@@ -232,21 +232,21 @@
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 Entry Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Text GLabel 5200 2400 1    50   Input ~ 0
 5V
 Wire Wire Line
-	5200 2750 5200 2400
+	5200 2750 5200 2500
 $Comp
 L Device:C C?
 U 1 1 61F22FD5
-P 3750 2750
+P 3800 2500
 AR Path="/61F22FD5" Ref="C?"  Part="1" 
 AR Path="/61F2273C/61F22FD5" Ref="A1"  Part="1" 
-F 0 "A1" H 3865 2796 50  0000 L CNN
-F 1 "A" H 3865 2705 50  0000 L CNN
-F 2 "" H 3788 2600 50  0001 C CNN
-F 3 "~" H 3750 2750 50  0001 C CNN
-	1    3750 2750
-	1    0    0    -1  
+F 0 "A1" H 3915 2546 50  0000 L CNN
+F 1 "47n/33n decoupler" H 3915 2455 50  0000 L CNN
+F 2 "" H 3838 2350 50  0001 C CNN
+F 3 "~" H 3800 2500 50  0001 C CNN
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 Wire Wire Line
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-	3550 4900 4200 4900
-Wire Wire Line
-	4200 4900 4200 3000
-Wire Wire Line
-	4200 3000 3750 3000
-Wire Wire Line
-	3750 3000 3750 2900
+	3550 4900 4100 4900
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 Wire Wire Line
 	3550 4900 3550 4800
-Wire Wire Line
-	3750 2600 3750 2500
-Wire Wire Line
-	3750 2500 3550 2500
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 Wire Wire Line
 	3550 2500 3550 2400
 Wire Wire Line
-	5300 5700 5300 5400
+	5300 5700 5300 5600
 Wire Wire Line
 	5300 5400 5500 5400
 Wire Wire Line
@@ -537,25 +527,25 @@
 Wire Wire Line
 	5700 1300 7500 1300
 Wire Bus Line
-	4000 6100 6700 6100
+	4000 6100 6500 6100
 Wire Wire Line
 	5900 4700 6000 4700
 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Text GLabel 9400 3300 2    50   Input ~ 0
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 Text GLabel 6200 4200 2    50   Input ~ 0
@@ -569,8 +559,8 @@
 Text GLabel 6800 6100 2    50   BiDi ~ 0
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 Wire Bus Line
-	6800 6100 6700 6100
-Connection ~ 6700 6100
+	6800 6100 6500 6100
+Connection ~ 6500 6100
 Text GLabel 6800 1100 2    50   Output ~ 0
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@@ -680,25 +670,6 @@
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 Wire Wire Line
 	6800 4100 6900 4100
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-U 5 1 61FA23D2
-P 10500 3100
-F 0 "IC18" H 10730 3146 50  0000 L CNN
-F 1 "74LS08" H 10730 3055 50  0000 L CNN
-F 2 "" H 10500 3100 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 10500 3100 50  0001 C CNN
-	5    10500 3100
-	1    0    0    -1  
-$EndComp
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 Text Label 6700 1100 2    50   ~ 0
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 Text Label 6700 1500 2    50   ~ 0
@@ -737,7 +708,7 @@
 	2100 1600 2200 1500
 Entry Bus Bus
 	4400 1600 4500 1500
-Text Label 6600 6100 2    50   ~ 0
+Text Label 6400 6100 2    50   ~ 0
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 $Comp
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@@ -786,6 +757,43 @@
 	8900 3300 8500 3300
 Text Notes 8900 3600 0    50   ~ 0
 Diode added to satisfy KiCad\nelectrical rules check.
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 	2200 1500 6800 1500
 Wire Bus Line
@@ -793,7 +801,7 @@
 Wire Bus Line
 	4000 3800 4000 6100
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diff -r d35594a45cbb -r 5616c5b75dcd RAM.sch
--- a/RAM.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/RAM.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
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-Sheet 3 9
+Sheet 3 10
 Title ""
 Date ""
 Rev ""
@@ -17,327 +17,279 @@
 $Comp
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-F 0 "IC4" H 2100 3225 50  0000 C CNN
-F 1 "4164" H 2100 3134 50  0000 C CNN
-F 2 "" H 2050 2650 50  0001 C CNN
-F 3 "" H 2050 2650 50  0001 C CNN
-	1    2100 2650
+P 2100 2250
+F 0 "IC4" H 2100 2825 50  0000 C CNN
+F 1 "4164" H 2100 2734 50  0000 C CNN
+F 2 "" H 2050 2250 50  0001 C CNN
+F 3 "" H 2050 2250 50  0001 C CNN
+	1    2100 2250
 	1    0    0    -1  
 $EndComp
 $Comp
 L DRAM:4164 IC5
 U 1 1 61D7F241
-P 3900 2650
-F 0 "IC5" H 3900 3225 50  0000 C CNN
-F 1 "4164" H 3900 3134 50  0000 C CNN
-F 2 "" H 3850 2650 50  0001 C CNN
-F 3 "" H 3850 2650 50  0001 C CNN
-	1    3900 2650
+P 3900 2250
+F 0 "IC5" H 3900 2825 50  0000 C CNN
+F 1 "4164" H 3900 2734 50  0000 C CNN
+F 2 "" H 3850 2250 50  0001 C CNN
+F 3 "" H 3850 2250 50  0001 C CNN
+	1    3900 2250
 	1    0    0    -1  
 $EndComp
 $Comp
 L DRAM:4164 IC6
 U 1 1 61D7F248
-P 5700 2650
-F 0 "IC6" H 5700 3225 50  0000 C CNN
-F 1 "4164" H 5700 3134 50  0000 C CNN
-F 2 "" H 5650 2650 50  0001 C CNN
-F 3 "" H 5650 2650 50  0001 C CNN
-	1    5700 2650
+P 5700 2250
+F 0 "IC6" H 5700 2825 50  0000 C CNN
+F 1 "4164" H 5700 2734 50  0000 C CNN
+F 2 "" H 5650 2250 50  0001 C CNN
+F 3 "" H 5650 2250 50  0001 C CNN
+	1    5700 2250
 	1    0    0    -1  
 $EndComp
 $Comp
 L DRAM:4164 IC7
 U 1 1 61D7F24F
-P 7500 2650
-F 0 "IC7" H 7500 3225 50  0000 C CNN
-F 1 "4164" H 7500 3134 50  0000 C CNN
-F 2 "" H 7450 2650 50  0001 C CNN
-F 3 "" H 7450 2650 50  0001 C CNN
-	1    7500 2650
+P 7500 2250
+F 0 "IC7" H 7500 2825 50  0000 C CNN
+F 1 "4164" H 7500 2734 50  0000 C CNN
+F 2 "" H 7450 2250 50  0001 C CNN
+F 3 "" H 7450 2250 50  0001 C CNN
+	1    7500 2250
 	1    0    0    -1  
 $EndComp
 Entry Wire Line
-	1500 2800 1600 2700
-Entry Wire Line
-	1500 2900 1600 2800
-Entry Wire Line
-	1500 3000 1600 2900
+	1500 2400 1600 2300
 Connection ~ 3000 3500
 Wire Bus Line
 	3000 3500 1500 3500
 Entry Wire Line
-	2900 2600 3000 2700
-Entry Wire Line
-	2900 2700 3000 2800
-Entry Wire Line
-	2900 2800 3000 2900
-Entry Wire Line
-	2900 2900 3000 3000
-Entry Wire Line
-	2900 3000 3000 3100
+	2900 2200 3000 2300
 Connection ~ 3300 3500
 Wire Bus Line
 	3300 3500 3000 3500
 Entry Wire Line
-	3300 2800 3400 2700
-Entry Wire Line
-	3300 2900 3400 2800
-Entry Wire Line
-	3300 3000 3400 2900
+	3300 2400 3400 2300
 Entry Wire Line
-	4700 2600 4800 2700
-Entry Wire Line
-	4700 2700 4800 2800
-Entry Wire Line
-	4700 2800 4800 2900
+	4700 2200 4800 2300
 Entry Wire Line
-	4700 2900 4800 3000
-Entry Wire Line
-	4700 3000 4800 3100
-Entry Wire Line
-	5100 2800 5200 2700
+	5100 2400 5200 2300
 Entry Wire Line
-	5100 2900 5200 2800
+	6500 2200 6600 2300
 Entry Wire Line
-	5100 3000 5200 2900
-Entry Wire Line
-	6500 2600 6600 2700
+	6900 2400 7000 2300
 Entry Wire Line
-	6500 2700 6600 2800
-Entry Wire Line
-	6500 2800 6600 2900
-Entry Wire Line
-	6500 2900 6600 3000
-Entry Wire Line
-	6500 3000 6600 3100
-Entry Wire Line
-	6900 2800 7000 2700
-Entry Wire Line
-	6900 2900 7000 2800
-Entry Wire Line
-	6900 3000 7000 2900
-Entry Wire Line
-	8300 2600 8400 2700
-Entry Wire Line
-	8300 2700 8400 2800
-Entry Wire Line
-	8300 2800 8400 2900
-Entry Wire Line
-	8300 2900 8400 3000
-Entry Wire Line
-	8300 3000 8400 3100
+	8300 2200 8400 2300
+Wire Wire Line
+	7850 2200 8300 2200
+Wire Wire Line
+	7850 2300 8300 2300
+Wire Wire Line
+	7850 2400 8300 2400
+Wire Wire Line
+	7850 2500 8300 2500
 Wire Wire Line
 	7850 2600 8300 2600
 Wire Wire Line
-	7850 2700 8300 2700
+	7000 2300 7150 2300
 Wire Wire Line
-	7850 2800 8300 2800
+	7000 2400 7150 2400
 Wire Wire Line
-	7850 2900 8300 2900
+	7000 2500 7150 2500
 Wire Wire Line
-	7850 3000 8300 3000
+	1600 2300 1750 2300
 Wire Wire Line
-	7000 2700 7150 2700
+	1600 2400 1750 2400
 Wire Wire Line
-	7000 2800 7150 2800
+	1600 2500 1750 2500
 Wire Wire Line
-	7000 2900 7150 2900
+	2450 2200 2900 2200
 Wire Wire Line
-	1600 2700 1750 2700
+	2450 2300 2900 2300
 Wire Wire Line
-	1600 2800 1750 2800
+	2450 2400 2900 2400
 Wire Wire Line
-	1600 2900 1750 2900
+	2450 2500 2900 2500
 Wire Wire Line
 	2450 2600 2900 2600
 Wire Wire Line
-	2450 2700 2900 2700
+	3400 2300 3550 2300
 Wire Wire Line
-	2450 2800 2900 2800
+	3400 2400 3550 2400
 Wire Wire Line
-	2450 2900 2900 2900
+	3400 2500 3550 2500
 Wire Wire Line
-	2450 3000 2900 3000
+	4250 2200 4700 2200
 Wire Wire Line
-	3400 2700 3550 2700
+	4250 2300 4700 2300
 Wire Wire Line
-	3400 2800 3550 2800
+	4250 2400 4700 2400
 Wire Wire Line
-	3400 2900 3550 2900
+	4250 2500 4700 2500
 Wire Wire Line
 	4250 2600 4700 2600
 Wire Wire Line
-	4250 2700 4700 2700
-Wire Wire Line
-	4250 2800 4700 2800
-Wire Wire Line
-	4250 2900 4700 2900
-Wire Wire Line
-	4250 3000 4700 3000
-Wire Wire Line
-	5200 2700 5350 2700
+	5200 2300 5350 2300
 Wire Wire Line
-	5200 2800 5350 2800
-Wire Wire Line
-	5200 2900 5350 2900
-Wire Wire Line
-	6050 2600 6500 2600
-Wire Wire Line
-	6050 2700 6500 2700
-Wire Wire Line
-	6050 2800 6500 2800
-Wire Wire Line
-	6050 2900 6500 2900
+	5200 2400 5350 2400
 Wire Wire Line
-	6050 3000 6500 3000
-Text Label 7900 2600 0    50   ~ 0
-A6
-Text Label 7900 2700 0    50   ~ 0
-A3
-Text Label 7900 2800 0    50   ~ 0
-A4
-Text Label 7900 2900 0    50   ~ 0
-A5
-Text Label 7900 3000 0    50   ~ 0
-A7
-Text Label 7100 2700 2    50   ~ 0
-A0
-Text Label 7100 2800 2    50   ~ 0
-A2
-Text Label 7100 2900 2    50   ~ 0
-A1
-Text Label 6100 2600 0    50   ~ 0
-A6
-Text Label 4300 2600 0    50   ~ 0
-A6
-Text Label 2500 2600 0    50   ~ 0
-A6
-Text Label 6100 2700 0    50   ~ 0
-A3
-Text Label 4300 2700 0    50   ~ 0
-A3
-Text Label 2500 2700 0    50   ~ 0
-A3
-Text Label 6100 2800 0    50   ~ 0
-A4
-Text Label 4300 2800 0    50   ~ 0
-A4
-Text Label 2500 2800 0    50   ~ 0
-A4
-Text Label 6100 2900 0    50   ~ 0
-A5
-Text Label 4300 2900 0    50   ~ 0
-A5
-Text Label 2500 2900 0    50   ~ 0
-A5
-Text Label 6100 3000 0    50   ~ 0
-A7
-Text Label 4300 3000 0    50   ~ 0
-A7
-Text Label 2500 3000 0    50   ~ 0
-A7
-Text Label 5300 2700 2    50   ~ 0
-A0
-Text Label 5300 2800 2    50   ~ 0
-A2
-Text Label 5300 2900 2    50   ~ 0
-A1
-Text Label 3500 2700 2    50   ~ 0
-A0
-Text Label 1700 2700 2    50   ~ 0
-A0
-Text Label 3500 2800 2    50   ~ 0
-A2
-Text Label 1700 2800 2    50   ~ 0
-A2
-Text Label 3500 2900 2    50   ~ 0
-A1
-Text Label 1700 2900 2    50   ~ 0
-A1
+	5200 2500 5350 2500
 Wire Wire Line
-	2450 2400 2900 2400
-Wire Wire Line
-	4250 2400 4700 2400
+	6050 2200 6500 2200
 Wire Wire Line
-	4900 2500 5350 2500
-Wire Wire Line
-	5000 2600 5350 2600
+	6050 2300 6500 2300
 Wire Wire Line
 	6050 2400 6500 2400
 Wire Wire Line
-	6700 2500 7150 2500
-Wire Wire Line
-	6800 2600 7150 2600
+	6050 2500 6500 2500
 Wire Wire Line
-	7850 2400 8300 2400
-Text Label 7100 2600 2    50   ~ 0
-~RAS
-Text Label 5300 2600 2    50   ~ 0
-~RAS
-Text Label 3500 2600 2    50   ~ 0
-~RAS
-Text Label 1700 2600 2    50   ~ 0
-~RAS
+	6050 2600 6500 2600
+Text Label 7900 2200 0    50   ~ 0
+A6
+Text Label 7900 2300 0    50   ~ 0
+A3
+Text Label 7900 2400 0    50   ~ 0
+A4
+Text Label 7900 2500 0    50   ~ 0
+A5
+Text Label 7900 2600 0    50   ~ 0
+A7
+Text Label 7100 2300 2    50   ~ 0
+A0
+Text Label 7100 2400 2    50   ~ 0
+A2
 Text Label 7100 2500 2    50   ~ 0
-~WE
+A1
+Text Label 6100 2200 0    50   ~ 0
+A6
+Text Label 4300 2200 0    50   ~ 0
+A6
+Text Label 2500 2200 0    50   ~ 0
+A6
+Text Label 6100 2300 0    50   ~ 0
+A3
+Text Label 4300 2300 0    50   ~ 0
+A3
+Text Label 2500 2300 0    50   ~ 0
+A3
+Text Label 6100 2400 0    50   ~ 0
+A4
+Text Label 4300 2400 0    50   ~ 0
+A4
+Text Label 2500 2400 0    50   ~ 0
+A4
+Text Label 6100 2500 0    50   ~ 0
+A5
+Text Label 4300 2500 0    50   ~ 0
+A5
+Text Label 2500 2500 0    50   ~ 0
+A5
+Text Label 6100 2600 0    50   ~ 0
+A7
+Text Label 4300 2600 0    50   ~ 0
+A7
+Text Label 2500 2600 0    50   ~ 0
+A7
+Text Label 5300 2300 2    50   ~ 0
+A0
+Text Label 5300 2400 2    50   ~ 0
+A2
 Text Label 5300 2500 2    50   ~ 0
-~WE
+A1
+Text Label 3500 2300 2    50   ~ 0
+A0
+Text Label 1700 2300 2    50   ~ 0
+A0
+Text Label 3500 2400 2    50   ~ 0
+A2
+Text Label 1700 2400 2    50   ~ 0
+A2
 Text Label 3500 2500 2    50   ~ 0
-~WE
+A1
 Text Label 1700 2500 2    50   ~ 0
+A1
+Wire Wire Line
+	2450 2000 2900 2000
+Wire Wire Line
+	4250 2000 4700 2000
+Wire Wire Line
+	4900 2100 5350 2100
+Wire Wire Line
+	5000 2200 5350 2200
+Wire Wire Line
+	6050 2000 6500 2000
+Wire Wire Line
+	6700 2100 7150 2100
+Wire Wire Line
+	6800 2200 7150 2200
+Wire Wire Line
+	7850 2000 8300 2000
+Text Label 7100 2200 2    50   ~ 0
+~RAS
+Text Label 5300 2200 2    50   ~ 0
+~RAS
+Text Label 3500 2200 2    50   ~ 0
+~RAS
+Text Label 1700 2200 2    50   ~ 0
+~RAS
+Text Label 7100 2100 2    50   ~ 0
 ~WE
-Text Label 7900 2400 0    50   ~ 0
-~CAS
-Text Label 6100 2400 0    50   ~ 0
+Text Label 5300 2100 2    50   ~ 0
+~WE
+Text Label 3500 2100 2    50   ~ 0
+~WE
+Text Label 1700 2100 2    50   ~ 0
+~WE
+Text Label 7900 2000 0    50   ~ 0
 ~CAS
-Text Label 4300 2400 0    50   ~ 0
+Text Label 6100 2000 0    50   ~ 0
 ~CAS
-Text Label 2500 2400 0    50   ~ 0
+Text Label 4300 2000 0    50   ~ 0
+~CAS
+Text Label 2500 2000 0    50   ~ 0
 ~CAS
 Wire Wire Line
-	6900 2400 6800 2300
+	6900 2000 6800 1900
 Wire Wire Line
-	6800 2300 6800 1700
+	6800 1900 6800 1300
 Wire Wire Line
-	8400 2400 8400 1700
+	8400 2000 8400 1300
 Wire Wire Line
-	8300 2500 8400 2400
+	8300 2100 8400 2000
 Wire Wire Line
-	7850 2500 8300 2500
+	7850 2100 8300 2100
 Wire Wire Line
-	6500 2500 6600 2400
+	6500 2100 6600 2000
 Wire Wire Line
-	6600 2400 6600 1700
+	6600 2000 6600 1300
 Wire Wire Line
-	6050 2500 6500 2500
+	6050 2100 6500 2100
 Wire Wire Line
-	4700 2500 4800 2400
+	4700 2100 4800 2000
 Wire Wire Line
-	4800 2400 4800 1700
+	4800 2000 4800 1300
 Wire Wire Line
-	4700 2500 4250 2500
+	4700 2100 4250 2100
 Wire Wire Line
-	2900 2500 3000 2400
+	2900 2100 3000 2000
 Wire Wire Line
-	3000 2400 3000 1700
+	3000 2000 3000 1300
 Wire Wire Line
-	2900 2500 2450 2500
+	2900 2100 2450 2100
 Wire Wire Line
-	5000 2300 5100 2400
+	5000 1900 5100 2000
 Wire Wire Line
-	5000 1700 5000 2300
+	5000 1300 5000 1900
 Wire Wire Line
-	1400 2300 1500 2400
+	1400 1900 1500 2000
 Wire Wire Line
-	1400 1700 1400 2300
+	1400 1300 1400 1900
 Wire Wire Line
-	3200 2300 3300 2400
+	3200 1900 3300 2000
 Wire Wire Line
-	3200 1700 3200 2300
+	3200 1300 3200 1900
 Connection ~ 8400 3500
-Text Label 7900 2500 0    50   ~ 0
+Text Label 7900 2100 0    50   ~ 0
 RAM3
 Connection ~ 6900 3500
 Wire Bus Line
@@ -353,71 +305,71 @@
 	4800 3500 5100 3500
 Wire Bus Line
 	3300 3500 4800 3500
-Text Label 6100 2500 0    50   ~ 0
+Text Label 6100 2100 0    50   ~ 0
 RAM2
-Text Label 4300 2500 0    50   ~ 0
+Text Label 4300 2100 0    50   ~ 0
 RAM1
-Text Label 2500 2500 0    50   ~ 0
+Text Label 2500 2100 0    50   ~ 0
 RAM0
-Text Label 7100 2400 2    50   ~ 0
+Text Label 7100 2000 2    50   ~ 0
 RAM3
-Text Label 5300 2400 2    50   ~ 0
+Text Label 5300 2000 2    50   ~ 0
 RAM2
-Text Label 3500 2400 2    50   ~ 0
+Text Label 3500 2000 2    50   ~ 0
 RAM1
-Text Label 1700 2400 2    50   ~ 0
+Text Label 1700 2000 2    50   ~ 0
 RAM0
 Wire Wire Line
-	6900 2400 7150 2400
+	6900 2000 7150 2000
 Wire Wire Line
-	5100 2400 5350 2400
+	5100 2000 5350 2000
 Wire Wire Line
-	3300 2400 3550 2400
+	3300 2000 3550 2000
 Wire Wire Line
-	1500 2400 1750 2400
+	1500 2000 1750 2000
 Entry Wire Line
-	8300 1600 8400 1700
+	8300 1200 8400 1300
 Entry Wire Line
-	6700 1600 6800 1700
+	6700 1200 6800 1300
 Entry Wire Line
-	6500 1600 6600 1700
+	6500 1200 6600 1300
 Entry Wire Line
-	4900 1600 5000 1700
+	4900 1200 5000 1300
 Entry Wire Line
-	4700 1600 4800 1700
+	4700 1200 4800 1300
 Entry Wire Line
-	3100 1600 3200 1700
+	3100 1200 3200 1300
 Entry Wire Line
-	2900 1600 3000 1700
+	2900 1200 3000 1300
 Entry Wire Line
-	1300 1600 1400 1700
+	1300 1200 1400 1300
 Text GLabel 1000 1200 1    50   Input ~ 0
 5V
 Wire Wire Line
 	1000 1200 1000 3400
 Wire Wire Line
-	7000 3000 7100 3000
+	7000 2600 7100 2600
 Wire Wire Line
-	5200 3000 5300 3000
+	5200 2600 5300 2600
 Wire Wire Line
-	3400 3000 3500 3000
+	3400 2600 3500 2600
 Wire Wire Line
-	1600 3000 1700 3000
-Text GLabel 1600 1200 1    50   Input ~ 0
+	1600 2600 1700 2600
+Text GLabel 1600 800  1    50   Input ~ 0
 0V
 Wire Wire Line
-	1600 1200 1600 1400
+	1600 800  1600 1000
 Wire Wire Line
-	8200 2300 7850 2300
+	8200 1900 7850 1900
 Wire Wire Line
-	6050 2300 6400 2300
+	6050 1900 6400 1900
 Wire Wire Line
-	4250 2300 4600 2300
+	4250 1900 4600 1900
 Wire Wire Line
-	2450 2300 2800 2300
+	2450 1900 2800 1900
 Wire Bus Line
 	8400 3500 8900 3500
-Text GLabel 8900 1600 2    50   BiDi ~ 0
+Text GLabel 8900 1200 2    50   BiDi ~ 0
 RAM[0..3]
 Text GLabel 8900 3500 2    50   Input ~ 0
 RA[0..7]
@@ -428,364 +380,437 @@
 Text GLabel 8650 3600 2    50   Input ~ 0
 ~RAS
 Wire Wire Line
-	1300 2500 1750 2500
-Text GLabel 8900 1900 2    50   Input ~ 0
+	1300 2100 1750 2100
+Text GLabel 8900 1400 2    50   Input ~ 0
 ~CAS
 Wire Wire Line
 	1300 3700 3100 3700
 Wire Wire Line
-	1300 3700 1300 2500
+	1300 3700 1300 2100
 Wire Wire Line
-	3550 2500 3100 2500
+	3550 2100 3100 2100
 Wire Wire Line
-	3100 2500 3100 3700
+	3100 2100 3100 3700
 Connection ~ 3100 3700
 Wire Wire Line
 	3100 3700 4900 3700
 Wire Wire Line
-	4900 2500 4900 3700
+	4900 2100 4900 3700
 Connection ~ 4900 3700
 Wire Wire Line
 	4900 3700 6700 3700
 Wire Wire Line
-	6700 2500 6700 3700
+	6700 2100 6700 3700
 Connection ~ 6700 3700
 Wire Wire Line
 	6700 3700 8900 3700
 Wire Wire Line
-	6800 2600 6800 3600
+	6800 2200 6800 3600
 Wire Wire Line
 	6800 3600 8650 3600
 Wire Wire Line
-	5000 2600 5000 3600
+	5000 2200 5000 3600
 Wire Wire Line
 	5000 3600 6800 3600
 Connection ~ 6800 3600
 Wire Wire Line
-	3550 2600 3200 2600
+	3550 2200 3200 2200
 Wire Wire Line
-	3200 2600 3200 3600
+	3200 2200 3200 3600
 Wire Wire Line
 	3200 3600 5000 3600
 Connection ~ 5000 3600
 Wire Wire Line
-	1750 2600 1400 2600
+	1750 2200 1400 2200
 Wire Wire Line
-	1400 2600 1400 3600
+	1400 2200 1400 3600
 Wire Wire Line
 	1400 3600 3200 3600
 Connection ~ 3200 3600
 Wire Wire Line
-	8300 2400 8300 1900
+	8300 2000 8300 1400
 Wire Wire Line
-	8300 1900 8900 1900
+	8300 1400 8900 1400
 Wire Wire Line
-	6500 2400 6500 1900
+	6500 2000 6500 1400
 Wire Wire Line
-	6500 1900 8300 1900
-Connection ~ 8300 1900
+	6500 1400 8300 1400
+Connection ~ 8300 1400
 Wire Wire Line
-	4700 2400 4700 1900
+	4700 2000 4700 1400
 Wire Wire Line
-	4700 1900 6500 1900
-Connection ~ 6500 1900
+	4700 1400 6500 1400
+Connection ~ 6500 1400
 Wire Wire Line
-	2900 2400 2900 1900
+	2900 2000 2900 1400
 Wire Wire Line
-	2900 1900 4700 1900
-Connection ~ 4700 1900
+	2900 1400 4700 1400
+Connection ~ 4700 1400
 $Comp
 L DRAM:TM4164EA4 IC20
 U 1 1 623B101C
-P 1350 5250
+P 1550 5350
 AR Path="/623B101C" Ref="IC20"  Part="1" 
 AR Path="/61D7EEE8/623B101C" Ref="IC20"  Part="1" 
-F 0 "IC20" H 1072 5296 50  0000 R CNN
-F 1 "TM4164EA4" H 1072 5205 50  0000 R CNN
-F 2 "" H 1400 5750 50  0001 C CNN
-F 3 "" H 1400 5750 50  0001 C CNN
-	1    1350 5250
+F 0 "IC20" H 1272 5396 50  0000 R CNN
+F 1 "TM4164EA4" H 1272 5305 50  0000 R CNN
+F 2 "" H 1600 5850 50  0001 C CNN
+F 3 "" H 1600 5850 50  0001 C CNN
+	1    1550 5350
 	1    0    0    -1  
 $EndComp
-Text GLabel 1350 3900 1    50   Input ~ 0
+Text GLabel 1550 3900 1    50   Input ~ 0
 5V
-Text GLabel 1350 6600 3    50   Input ~ 0
+Text GLabel 1550 7100 3    50   Input ~ 0
 0V
 Wire Wire Line
-	1350 3900 1350 4000
+	1550 3900 1550 4000
 Wire Wire Line
-	1350 6600 1350 6500
-Text GLabel 8900 5000 2    50   Input ~ 0
+	1550 7100 1550 6800
+Text GLabel 8900 5100 2    50   Input ~ 0
 RA[0..7]
 Wire Bus Line
-	8900 5000 2100 5000
+	8900 5100 2400 5100
 Entry Wire Line
-	2000 5100 2100 5000
+	2300 5200 2400 5100
 Entry Wire Line
-	2000 5200 2100 5100
+	2300 5300 2400 5200
 Entry Wire Line
-	2000 5300 2100 5200
+	2300 5400 2400 5300
 Entry Wire Line
-	2000 5400 2100 5300
+	2300 5500 2400 5400
 Entry Wire Line
-	2000 5500 2100 5400
+	2300 5600 2400 5500
 Entry Wire Line
-	2000 5600 2100 5500
+	2300 5700 2400 5600
 Entry Wire Line
-	2000 5700 2100 5600
+	2300 5800 2400 5700
 Entry Wire Line
-	2000 5800 2100 5700
+	2300 5900 2400 5800
 Wire Wire Line
-	1700 5100 2000 5100
+	1900 5200 2300 5200
 Wire Wire Line
-	1700 5200 2000 5200
+	1900 5300 2300 5300
 Wire Wire Line
-	1700 5300 2000 5300
+	1900 5400 2300 5400
 Wire Wire Line
-	1700 5400 2000 5400
+	1900 5500 2300 5500
 Wire Wire Line
-	1700 5500 2000 5500
+	1900 5600 2300 5600
 Wire Wire Line
-	1700 5600 2000 5600
+	1900 5700 2300 5700
 Wire Wire Line
-	1700 5700 2000 5700
+	1900 5800 2300 5800
 Wire Wire Line
-	1700 5800 2000 5800
-NoConn ~ 1700 5900
-Text Label 1750 5100 0    50   ~ 0
+	1900 5900 2300 5900
+NoConn ~ 1900 6000
+Text Label 1950 5200 0    50   ~ 0
 A0
-Text Label 1750 5200 0    50   ~ 0
+Text Label 1950 5300 0    50   ~ 0
 A1
-Text Label 1750 5300 0    50   ~ 0
+Text Label 1950 5400 0    50   ~ 0
 A2
-Text Label 1750 5400 0    50   ~ 0
+Text Label 1950 5500 0    50   ~ 0
 A3
-Text Label 1750 5500 0    50   ~ 0
+Text Label 1950 5600 0    50   ~ 0
 A4
-Text Label 1750 5600 0    50   ~ 0
+Text Label 1950 5700 0    50   ~ 0
 A5
-Text Label 1750 5700 0    50   ~ 0
+Text Label 1950 5800 0    50   ~ 0
 A6
-Text Label 1750 5800 0    50   ~ 0
+Text Label 1950 5900 0    50   ~ 0
 A7
-Text GLabel 8900 4100 2    50   BiDi ~ 0
+Text GLabel 8900 4200 2    50   BiDi ~ 0
 RAM[0..3]
 Wire Bus Line
-	8900 4100 2100 4100
+	8900 4200 2400 4200
 Entry Wire Line
-	2000 4200 2100 4100
+	2300 4300 2400 4200
 Entry Wire Line
-	2000 4300 2100 4200
+	2300 4400 2400 4300
 Entry Wire Line
-	2000 4400 2100 4300
+	2300 4500 2400 4400
 Entry Wire Line
-	2000 4500 2100 4400
+	2300 4600 2400 4500
 Entry Wire Line
-	2000 4600 2100 4500
+	2300 4700 2400 4600
 Entry Wire Line
-	2000 4700 2100 4600
+	2300 4800 2400 4700
 Entry Wire Line
-	2000 4800 2100 4700
+	2300 4900 2400 4800
 Entry Wire Line
-	2000 4900 2100 4800
+	2300 5000 2400 4900
 Wire Wire Line
-	1700 4200 2000 4200
+	1900 4300 2300 4300
 Wire Wire Line
-	1700 4300 2000 4300
+	1900 4400 2300 4400
 Wire Wire Line
-	1700 4400 2000 4400
+	1900 4500 2300 4500
 Wire Wire Line
-	1700 4500 2000 4500
+	1900 4600 2300 4600
 Wire Wire Line
-	1700 4600 2000 4600
+	1900 4700 2300 4700
 Wire Wire Line
-	1700 4700 2000 4700
+	1900 4800 2300 4800
 Wire Wire Line
-	1700 4800 2000 4800
+	1900 4900 2300 4900
 Wire Wire Line
-	1700 4900 2000 4900
-Text Label 1750 4200 0    50   ~ 0
+	1900 5000 2300 5000
+Text Label 1950 4300 0    50   ~ 0
 RAM0
-Text Label 1750 4400 0    50   ~ 0
+Text Label 1950 4500 0    50   ~ 0
 RAM1
-Text Label 1750 4600 0    50   ~ 0
+Text Label 1950 4700 0    50   ~ 0
 RAM2
-Text Label 1750 4800 0    50   ~ 0
+Text Label 1950 4900 0    50   ~ 0
 RAM3
-Text Label 1750 4300 0    50   ~ 0
+Text Label 1950 4400 0    50   ~ 0
 RAM0
-Text Label 1750 4500 0    50   ~ 0
+Text Label 1950 4600 0    50   ~ 0
 RAM1
-Text Label 1750 4700 0    50   ~ 0
+Text Label 1950 4800 0    50   ~ 0
 RAM2
-Text Label 1750 4900 0    50   ~ 0
+Text Label 1950 5000 0    50   ~ 0
 RAM3
-Text Label 8850 5000 2    50   ~ 0
+Text Label 8850 5100 2    50   ~ 0
 A[0..7]
-Text GLabel 8900 6100 2    50   Input ~ 0
+Text GLabel 8900 6200 2    50   Input ~ 0
 ~CAS
-Text GLabel 8650 6200 2    50   Input ~ 0
+Text GLabel 8650 6300 2    50   Input ~ 0
 ~RAS
-Text GLabel 8900 6300 2    50   Input ~ 0
+Text GLabel 8900 6400 2    50   Input ~ 0
 ~WE
 Wire Wire Line
-	8900 6100 1700 6100
+	8900 6200 1900 6200
 Wire Wire Line
-	1700 6200 8650 6200
+	1900 6300 8650 6300
 Wire Wire Line
-	1700 6300 8900 6300
-Text Notes 2100 4000 0    50   ~ 0
+	1900 6400 8900 6400
+Text Notes 2100 4100 0    50   ~ 0
 Alternative DRAM single-in-line package
 $Comp
 L Device:C_Small A5
 U 1 1 62D1023B
-P 7900 3200
-F 0 "A5" V 8050 3200 50  0000 C CNN
-F 1 "A" V 7750 3200 50  0000 C CNN
-F 2 "" H 7900 3200 50  0001 C CNN
-F 3 "~" H 7900 3200 50  0001 C CNN
-	1    7900 3200
+P 7650 3000
+F 0 "A5" V 7800 3000 50  0000 C CNN
+F 1 "47n/33n decoupler" V 7500 3000 50  0000 C CNN
+F 2 "" H 7650 3000 50  0001 C CNN
+F 3 "~" H 7650 3000 50  0001 C CNN
+	1    7650 3000
 	0    1    1    0   
 $EndComp
 Wire Wire Line
-	8200 2300 8200 3200
+	8200 1900 8200 3000
 Wire Wire Line
-	8200 3200 8000 3200
+	8200 3000 7750 3000
 Wire Wire Line
-	7800 3200 7100 3200
+	7550 3000 7100 3000
 Wire Wire Line
-	7100 3200 7100 3000
+	7100 3000 7100 2600
 Wire Wire Line
-	7100 3000 7150 3000
-Connection ~ 7100 3000
+	7100 2600 7150 2600
+Connection ~ 7100 2600
 Wire Wire Line
-	1600 1400 2800 1400
+	1600 1000 2800 1000
 $Comp
 L Device:C_Small A4
 U 1 1 62DF3EF5
-P 6100 3200
-F 0 "A4" V 6250 3200 50  0000 C CNN
-F 1 "A" V 5950 3200 50  0000 C CNN
-F 2 "" H 6100 3200 50  0001 C CNN
-F 3 "~" H 6100 3200 50  0001 C CNN
-	1    6100 3200
+P 5850 3000
+F 0 "A4" V 6000 3000 50  0000 C CNN
+F 1 "47n/33n decoupler" V 5700 3000 50  0000 C CNN
+F 2 "" H 5850 3000 50  0001 C CNN
+F 3 "~" H 5850 3000 50  0001 C CNN
+	1    5850 3000
 	0    1    1    0   
 $EndComp
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-	6400 2300 6400 3200
+	6400 1900 6400 3000
 Wire Wire Line
-	6400 3200 6200 3200
+	6400 3000 5950 3000
 Wire Wire Line
-	6000 3200 5300 3200
+	5750 3000 5300 3000
 Wire Wire Line
-	5300 3200 5300 3000
-Connection ~ 5300 3000
+	5300 3000 5300 2600
+Connection ~ 5300 2600
 Wire Wire Line
-	5300 3000 5350 3000
+	5300 2600 5350 2600
 $Comp
 L Device:C_Small A3
 U 1 1 62E816E9
-P 4300 3200
-F 0 "A3" V 4450 3200 50  0000 C CNN
-F 1 "A" V 4150 3200 50  0000 C CNN
-F 2 "" H 4300 3200 50  0001 C CNN
-F 3 "~" H 4300 3200 50  0001 C CNN
-	1    4300 3200
+P 4050 3000
+F 0 "A3" V 4200 3000 50  0000 C CNN
+F 1 "47n/33n decoupler" V 3900 3000 50  0000 C CNN
+F 2 "" H 4050 3000 50  0001 C CNN
+F 3 "~" H 4050 3000 50  0001 C CNN
+	1    4050 3000
 	0    1    1    0   
 $EndComp
 Wire Wire Line
-	4600 2300 4600 3200
+	4600 1900 4600 3000
 Wire Wire Line
-	4600 3200 4400 3200
+	4600 3000 4150 3000
 Wire Wire Line
-	4200 3200 3500 3200
+	3950 3000 3500 3000
 Wire Wire Line
-	3500 3200 3500 3000
-Connection ~ 3500 3000
+	3500 3000 3500 2600
+Connection ~ 3500 2600
 Wire Wire Line
-	3500 3000 3550 3000
+	3500 2600 3550 2600
 $Comp
 L Device:C_Small A2
 U 1 1 62F3C917
-P 2500 3200
-F 0 "A2" V 2650 3200 50  0000 C CNN
-F 1 "A" V 2350 3200 50  0000 C CNN
-F 2 "" H 2500 3200 50  0001 C CNN
-F 3 "~" H 2500 3200 50  0001 C CNN
-	1    2500 3200
+P 2250 3000
+F 0 "A2" V 2400 3000 50  0000 C CNN
+F 1 "47n/33n decoupler" V 2100 3000 50  0000 C CNN
+F 2 "" H 2250 3000 50  0001 C CNN
+F 3 "~" H 2250 3000 50  0001 C CNN
+	1    2250 3000
 	0    1    1    0   
 $EndComp
 Wire Wire Line
-	2800 2300 2800 3200
+	2800 1900 2800 3000
 Wire Wire Line
-	2800 3200 2600 3200
+	2800 3000 2350 3000
 Wire Wire Line
-	2400 3200 1700 3200
+	2150 3000 1700 3000
 Wire Wire Line
-	1700 3200 1700 3000
-Connection ~ 1700 3000
+	1700 3000 1700 2600
+Connection ~ 1700 2600
 Wire Wire Line
-	1700 3000 1750 3000
+	1700 2600 1750 2600
 Wire Wire Line
 	1000 3400 1600 3400
 Wire Wire Line
-	1600 3000 1600 3400
+	1600 2600 1600 3400
 Wire Wire Line
 	1600 3400 3400 3400
 Wire Wire Line
-	3400 3000 3400 3400
+	3400 2600 3400 3400
 Connection ~ 1600 3400
 Wire Wire Line
 	3400 3400 5200 3400
 Wire Wire Line
-	5200 3000 5200 3400
+	5200 2600 5200 3400
 Connection ~ 3400 3400
 Wire Wire Line
 	5200 3400 7000 3400
 Wire Wire Line
-	7000 3000 7000 3400
+	7000 2600 7000 3400
 Connection ~ 5200 3400
 Wire Wire Line
-	8200 2300 8200 1400
-Connection ~ 8200 2300
+	8200 1900 8200 1000
+Connection ~ 8200 1900
+Wire Wire Line
+	6400 1900 6400 1000
+Connection ~ 6400 1900
+Connection ~ 6400 1000
+Wire Wire Line
+	6400 1000 8200 1000
 Wire Wire Line
-	6400 2300 6400 1400
-Connection ~ 6400 2300
-Connection ~ 6400 1400
+	4600 1900 4600 1000
+Connection ~ 4600 1900
+Connection ~ 4600 1000
 Wire Wire Line
-	6400 1400 8200 1400
+	4600 1000 6400 1000
+Wire Wire Line
+	2800 1900 2800 1000
+Connection ~ 2800 1900
+Connection ~ 2800 1000
 Wire Wire Line
-	4600 2300 4600 1400
-Connection ~ 4600 2300
-Connection ~ 4600 1400
-Wire Wire Line
-	4600 1400 6400 1400
+	2800 1000 4600 1000
+Entry Wire Line
+	2900 2300 3000 2400
+Entry Wire Line
+	2900 2400 3000 2500
+Entry Wire Line
+	2900 2500 3000 2600
+Entry Wire Line
+	2900 2600 3000 2700
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+	1500 2500 1600 2400
+Entry Wire Line
+	1500 2600 1600 2500
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+	3300 2500 3400 2400
+Entry Wire Line
+	3300 2600 3400 2500
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+	4700 2300 4800 2400
+Entry Wire Line
+	4700 2400 4800 2500
+Entry Wire Line
+	4700 2500 4800 2600
+Entry Wire Line
+	4700 2600 4800 2700
+Entry Wire Line
+	6500 2300 6600 2400
+Entry Wire Line
+	6500 2400 6600 2500
+Entry Wire Line
+	6500 2500 6600 2600
+Entry Wire Line
+	6500 2600 6600 2700
+Entry Wire Line
+	5100 2500 5200 2400
+Entry Wire Line
+	5100 2600 5200 2500
+Entry Wire Line
+	6900 2500 7000 2400
+Entry Wire Line
+	6900 2600 7000 2500
+Entry Wire Line
+	8300 2300 8400 2400
+Entry Wire Line
+	8300 2400 8400 2500
+Entry Wire Line
+	8300 2500 8400 2600
+Entry Wire Line
+	8300 2600 8400 2700
+$Comp
+L Device:C_Small A7
+U 1 1 647212B6
+P 1000 6800
+F 0 "A7" V 1150 6800 50  0000 C CNN
+F 1 "47n/33n decoupler" V 850 6800 50  0000 C CNN
+F 2 "" H 1000 6800 50  0001 C CNN
+F 3 "~" H 1000 6800 50  0001 C CNN
+	1    1000 6800
+	0    -1   -1   0   
+$EndComp
 Wire Wire Line
-	2800 2300 2800 1400
-Connection ~ 2800 2300
-Connection ~ 2800 1400
+	1550 6800 1100 6800
+Connection ~ 1550 6800
+Wire Wire Line
+	1550 6800 1550 6600
 Wire Wire Line
-	2800 1400 4600 1400
+	900  6800 700  6800
+Wire Wire Line
+	700  6800 700  4000
+Wire Wire Line
+	700  4000 1550 4000
 Wire Bus Line
-	1500 2800 1500 3500
+	1500 2400 1500 3500
 Wire Bus Line
-	3300 2800 3300 3500
+	3300 2400 3300 3500
+Wire Bus Line
+	5100 2400 5100 3500
 Wire Bus Line
-	5100 2800 5100 3500
+	6900 2400 6900 3500
 Wire Bus Line
-	6900 2800 6900 3500
+	3000 2300 3000 3500
 Wire Bus Line
-	6600 2700 6600 3500
+	4800 2300 4800 3500
 Wire Bus Line
-	8400 2700 8400 3500
+	6600 2300 6600 3500
 Wire Bus Line
-	4800 2700 4800 3500
+	8400 2300 8400 3500
 Wire Bus Line
-	3000 2700 3000 3500
+	2400 5100 2400 5800
 Wire Bus Line
-	2100 5000 2100 5700
+	2400 4200 2400 4900
 Wire Bus Line
-	2100 4100 2100 4800
-Wire Bus Line
-	1300 1600 8900 1600
+	1300 1200 8900 1200
+Connection ~ 1550 4000
+Wire Wire Line
+	1550 4000 1550 4100
 $EndSCHEMATC
diff -r d35594a45cbb -r 5616c5b75dcd UHF.sch
--- a/UHF.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/UHF.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 9 9
+Sheet 9 10
 Title ""
 Date ""
 Rev ""
@@ -52,19 +52,6 @@
 $EndComp
 $Comp
 L 74xx:74LS74 IC12
-U 3 1 61DD1F0E
-P 1200 6700
-AR Path="/61DB955D/61DF7FF4/61DD1F0E" Ref="IC12"  Part="3" 
-AR Path="/62411C42/61DD1F0E" Ref="IC11"  Part="3" 
-F 0 "IC11" H 1430 6746 50  0000 L CNN
-F 1 "74LS74" H 1430 6655 50  0000 L CNN
-F 2 "" H 1200 6700 50  0001 C CNN
-F 3 "74xx/74hc_hct74.pdf" H 1200 6700 50  0001 C CNN
-	3    1200 6700
-	1    0    0    -1  
-$EndComp
-$Comp
-L 74xx:74LS74 IC12
 U 1 1 61DD898C
 P 3100 6500
 AR Path="/61DB955D/61DF7FF4/61DD898C" Ref="IC12"  Part="1" 
@@ -89,19 +76,6 @@
 	2    4500 6200
 	1    0    0    -1  
 $EndComp
-$Comp
-L 74xx:74LS74 IC11
-U 3 1 61DD8ABE
-P 800 5800
-AR Path="/61DB955D/61DF7FF4/61DD8ABE" Ref="IC11"  Part="3" 
-AR Path="/62411C42/61DD8ABE" Ref="IC12"  Part="3" 
-F 0 "IC12" H 1030 5846 50  0000 L CNN
-F 1 "74LS74" H 1030 5755 50  0000 L CNN
-F 2 "" H 800 5800 50  0001 C CNN
-F 3 "74xx/74hc_hct74.pdf" H 800 5800 50  0001 C CNN
-	3    800  5800
-	1    0    0    -1  
-$EndComp
 Wire Wire Line
 	1700 5000 1900 5000
 Wire Wire Line
@@ -209,22 +183,6 @@
 	3400 6400 3600 6400
 Wire Wire Line
 	3850 5300 4000 5300
-Text GLabel 1200 6200 1    50   Input ~ 0
-5V
-Text GLabel 800  5300 1    50   Input ~ 0
-5V
-Text GLabel 1200 7200 3    50   Input ~ 0
-0V
-Text GLabel 800  6300 3    50   Input ~ 0
-0V
-Wire Wire Line
-	800  6300 800  6200
-Wire Wire Line
-	800  5400 800  5300
-Wire Wire Line
-	1200 7200 1200 7100
-Wire Wire Line
-	1200 6300 1200 6200
 $Comp
 L 74xx:74LS86 IC14
 U 2 1 61E8C5C6
@@ -347,48 +305,6 @@
 Wire Wire Line
 	4800 4300 5100 4300
 $Comp
-L 74xx:74LS86 IC15
-U 5 1 6205A86B
-P 800 4350
-AR Path="/61DB955D/61DF7FF4/6205A86B" Ref="IC15"  Part="5" 
-AR Path="/62411C42/6205A86B" Ref="IC14"  Part="5" 
-F 0 "IC14" H 1030 4396 50  0000 L CNN
-F 1 "74LS86" H 1030 4305 50  0000 L CNN
-F 2 "" H 800 4350 50  0001 C CNN
-F 3 "74xx/74ls86.pdf" H 800 4350 50  0001 C CNN
-	5    800  4350
-	1    0    0    -1  
-$EndComp
-$Comp
-L 74xx:74LS86 IC14
-U 5 1 6205ABE4
-P 1200 3300
-AR Path="/61DB955D/61DF7FF4/6205ABE4" Ref="IC14"  Part="5" 
-AR Path="/62411C42/6205ABE4" Ref="IC15"  Part="5" 
-F 0 "IC15" H 1430 3346 50  0000 L CNN
-F 1 "74LS86" H 1430 3255 50  0000 L CNN
-F 2 "" H 1200 3300 50  0001 C CNN
-F 3 "74xx/74ls86.pdf" H 1200 3300 50  0001 C CNN
-	5    1200 3300
-	1    0    0    -1  
-$EndComp
-Text GLabel 1200 2700 1    50   Input ~ 0
-5V
-Text GLabel 800  3750 1    50   Input ~ 0
-5V
-Text GLabel 800  4950 3    50   Input ~ 0
-0V
-Text GLabel 1200 3900 3    50   Input ~ 0
-0V
-Wire Wire Line
-	1200 2700 1200 2800
-Wire Wire Line
-	1200 3800 1200 3900
-Wire Wire Line
-	800  3750 800  3850
-Wire Wire Line
-	800  4850 800  4950
-$Comp
 L 74xx:74LS00 IC16
 U 1 1 620777FB
 P 7100 3500
@@ -724,48 +640,6 @@
 Wire Wire Line
 	6400 3600 6800 3600
 $Comp
-L 74xx:74LS00 IC16
-U 5 1 61E3EA72
-P 1200 1300
-AR Path="/61DB955D/61DF7FF4/61E3EA72" Ref="IC16"  Part="5" 
-AR Path="/62411C42/61E3EA72" Ref="IC16"  Part="5" 
-F 0 "IC16" H 1430 1346 50  0000 L CNN
-F 1 "74LS00" H 1430 1255 50  0000 L CNN
-F 2 "" H 1200 1300 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 1200 1300 50  0001 C CNN
-	5    1200 1300
-	1    0    0    -1  
-$EndComp
-Text GLabel 1200 1900 3    50   Input ~ 0
-0V
-Text GLabel 1200 700  1    50   Input ~ 0
-5V
-Wire Wire Line
-	1200 800  1200 700 
-Wire Wire Line
-	1200 1900 1200 1800
-$Comp
-L 74xx:74LS00 IC10
-U 5 1 61E9B602
-P 800 2300
-AR Path="/61DB955D/61DF7FF4/61E9B602" Ref="IC10"  Part="5" 
-AR Path="/62411C42/61E9B602" Ref="IC10"  Part="5" 
-F 0 "IC10" H 1030 2346 50  0000 L CNN
-F 1 "74LS00" H 1030 2255 50  0000 L CNN
-F 2 "" H 800 2300 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 800 2300 50  0001 C CNN
-	5    800  2300
-	1    0    0    -1  
-$EndComp
-Text GLabel 800  2900 3    50   Input ~ 0
-0V
-Text GLabel 800  1700 1    50   Input ~ 0
-5V
-Wire Wire Line
-	800  1800 800  1700
-Wire Wire Line
-	800  2900 800  2800
-$Comp
 L 74xx:74LS00 IC10
 U 1 1 61EB617E
 P 6300 6800
diff -r d35594a45cbb -r 5616c5b75dcd cassette.sch
--- a/cassette.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/cassette.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 4 9
+Sheet 4 10
 Title ""
 Date ""
 Rev ""
@@ -602,25 +602,6 @@
 	10200 1900 10000 1900
 $Comp
 L Amplifier_Operational:LM324 IC13
-U 5 1 626384A4
-P 3700 6700
-F 0 "IC13" H 3658 6746 50  0000 L CNN
-F 1 "LM324" H 3658 6655 50  0000 L CNN
-F 2 "" H 3650 6800 50  0001 C CNN
-F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 3750 6900 50  0001 C CNN
-	5    3700 6700
-	1    0    0    -1  
-$EndComp
-Text GLabel 3600 7100 3    50   Input ~ 0
--5V
-Text GLabel 3600 6300 1    50   Input ~ 0
-5V
-Wire Wire Line
-	3600 6400 3600 6300
-Wire Wire Line
-	3600 7100 3600 7000
-$Comp
-L Amplifier_Operational:LM324 IC13
 U 1 1 6263C24D
 P 7800 1800
 F 0 "IC13" H 7800 2167 50  0000 C CNN
diff -r d35594a45cbb -r 5616c5b75dcd clocks.sch
--- a/clocks.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/clocks.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 2 9
+Sheet 2 10
 Title ""
 Date ""
 Rev ""
@@ -307,108 +307,108 @@
 $Comp
 L 74xx:74LS163 IC?
 U 1 1 61F9FB39
-P 6500 2700
+P 7900 2700
 AR Path="/61F9FB39" Ref="IC?"  Part="1" 
 AR Path="/61DF4BC2/61F9FB39" Ref="IC9"  Part="1" 
-F 0 "IC9" H 6200 3600 50  0000 C CNN
-F 1 "74LS163" H 6200 3500 50  0000 C CNN
-F 2 "" H 6500 2700 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74LS169" H 6500 2700 50  0001 C CNN
-	1    6500 2700
+F 0 "IC9" H 7600 3600 50  0000 C CNN
+F 1 "74LS163" H 7600 3500 50  0000 C CNN
+F 2 "" H 7900 2700 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74LS169" H 7900 2700 50  0001 C CNN
+	1    7900 2700
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	5900 2500 5900 2400
+	7300 2500 7300 2400
 Wire Wire Line
-	5900 2400 6000 2400
+	7300 2400 7400 2400
 Wire Wire Line
-	5900 2500 6000 2500
+	7300 2500 7400 2500
 Wire Wire Line
-	7000 2500 7200 2500
-Text GLabel 6500 3650 3    50   Input ~ 0
+	8400 2500 8600 2500
+Text GLabel 7900 3650 3    50   Input ~ 0
 0V
 Wire Wire Line
-	6500 3650 6500 3500
-Text GLabel 6500 1800 1    50   Input ~ 0
+	7900 3650 7900 3500
+Text GLabel 7900 1600 1    50   Input ~ 0
 5V
 Wire Wire Line
-	6500 1900 6500 1800
+	7900 1900 7900 1700
 Wire Wire Line
-	4100 3000 6000 3000
-Text GLabel 5800 3200 0    50   Input ~ 0
+	4100 3000 7400 3000
+Text GLabel 7200 3200 0    50   Input ~ 0
 0V
-NoConn ~ 7000 2300
-NoConn ~ 7000 2200
-NoConn ~ 7000 2700
+NoConn ~ 8400 2300
+NoConn ~ 8400 2200
+NoConn ~ 8400 2700
 Wire Wire Line
-	5800 3200 5900 3200
+	7200 3200 7300 3200
 Wire Wire Line
-	5900 2400 5900 2300
+	7300 2400 7300 2300
 Wire Wire Line
-	5900 2300 6000 2300
-Connection ~ 5900 2400
+	7300 2300 7400 2300
+Connection ~ 7300 2400
 Wire Wire Line
-	5900 2300 5900 2200
+	7300 2300 7300 2200
 Wire Wire Line
-	5900 2200 6000 2200
-Connection ~ 5900 2300
+	7300 2200 7400 2200
+Connection ~ 7300 2300
 $Comp
 L 74xx:74LS00 U?
 U 1 1 61F9FB55
-P 7600 2500
+P 9000 2500
 AR Path="/61F9FB55" Ref="U?"  Part="1" 
 AR Path="/61DF4BC2/61F9FB55" Ref="IC17"  Part="1" 
-F 0 "IC17" H 7600 2825 50  0000 C CNN
-F 1 "74LS00" H 7600 2734 50  0000 C CNN
-F 2 "" H 7600 2500 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 7600 2500 50  0001 C CNN
-	1    7600 2500
+F 0 "IC17" H 9000 2825 50  0000 C CNN
+F 1 "74LS00" H 9000 2734 50  0000 C CNN
+F 2 "" H 9000 2500 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 9000 2500 50  0001 C CNN
+	1    9000 2500
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	7000 2400 7300 2400
+	8400 2400 8700 2400
 Wire Wire Line
-	7200 2500 7200 2600
+	8600 2500 8600 2600
 Wire Wire Line
-	7200 2600 7300 2600
+	8600 2600 8700 2600
 Wire Wire Line
-	7900 2500 7900 1600
+	9300 2500 9300 1400
 Wire Wire Line
-	7900 1600 5600 1600
+	9300 1400 7000 1400
 Wire Wire Line
-	5600 1600 5600 2700
+	7000 1400 7000 2700
 Wire Wire Line
-	5600 2700 6000 2700
+	7000 2700 7400 2700
 Wire Wire Line
-	5900 2500 5900 2800
-Connection ~ 5900 2500
-Connection ~ 5900 3200
+	7300 2500 7300 2800
+Connection ~ 7300 2500
+Connection ~ 7300 3200
 Wire Wire Line
-	5900 3200 6000 3200
+	7300 3200 7400 3200
 Wire Wire Line
-	6000 2800 5900 2800
-Connection ~ 5900 2800
+	7400 2800 7300 2800
+Connection ~ 7300 2800
 Wire Wire Line
-	5900 2800 5900 2900
+	7300 2800 7300 2900
 Wire Wire Line
-	6000 2900 5900 2900
-Connection ~ 5900 2900
+	7400 2900 7300 2900
+Connection ~ 7300 2900
 Wire Wire Line
-	5900 2900 5900 3200
-Text Notes 6900 3300 0    50   ~ 0
+	7300 2900 7300 3200
+Text Notes 8300 3300 0    50   ~ 0
 Service Manual and issue 4\nuse 74LS169 for IC9.
 Wire Wire Line
 	4100 3000 4100 1800
 Connection ~ 4100 1800
 Wire Wire Line
 	4100 1800 4100 1200
-Text GLabel 8100 2800 2    50   Output ~ 0
+Text GLabel 9500 2800 2    50   Output ~ 0
 CLOCK_16MHz_DIV_13
 Wire Wire Line
-	8100 2800 7200 2800
+	9500 2800 8600 2800
 Wire Wire Line
-	7200 2800 7200 2600
-Connection ~ 7200 2600
+	8600 2800 8600 2600
+Connection ~ 8600 2600
 Text Notes 4200 2950 0    50   ~ 0
 Issue 6 boards tend to have\nIC18 (74LS08) fitted for\nsome kind of buffering\nof the clock signal.\n\nWithout it, LK10 is made to\ndeliver the signal directly,\nbut LK10 seems not to be made.\n\nAccording to "Acorn Information\n- Volume 1", LK10 would be\nmade for boards using the\nFerranti ULA.
 $Comp
@@ -450,26 +450,7 @@
 Connection ~ 5500 1100
 Wire Wire Line
 	5500 1100 5400 1100
-$Comp
-L 74xx:74LS00 IC17
-U 5 1 61F8B195
-P 9700 2700
-F 0 "IC17" H 9930 2746 50  0000 L CNN
-F 1 "74LS00" H 9930 2655 50  0000 L CNN
-F 2 "" H 9700 2700 50  0001 C CNN
-F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 9700 2700 50  0001 C CNN
-	5    9700 2700
-	1    0    0    -1  
-$EndComp
-Text GLabel 9700 2100 1    50   Input ~ 0
-5V
-Text GLabel 9700 3300 3    50   Input ~ 0
-0V
-Wire Wire Line
-	9700 2200 9700 2100
-Wire Wire Line
-	9700 3300 9700 3200
-Text Notes 8000 2300 0    50   ~ 0
+Text Notes 9400 2300 0    50   ~ 0
 IC17 label deduced from schematic.
 $Comp
 L Device:C_Variable VC1
@@ -486,4 +467,29 @@
 	2550 2600 2350 2600
 Text Notes 1600 2650 2    50   ~ 0
 PAL video clock circuit.
+$Comp
+L Device:C_Small A?
+U 1 1 646F71A5
+P 7100 3500
+AR Path="/61D7EEE8/646F71A5" Ref="A?"  Part="1" 
+AR Path="/61DF4BC2/646F71A5" Ref="A6"  Part="1" 
+F 0 "A6" V 7250 3500 50  0000 C CNN
+F 1 "47n/33n decoupler" V 6950 3500 50  0000 C CNN
+F 2 "" H 7100 3500 50  0001 C CNN
+F 3 "~" H 7100 3500 50  0001 C CNN
+	1    7100 3500
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	7900 3500 7200 3500
+Wire Wire Line
+	7000 3500 6600 3500
+Connection ~ 7900 3500
+Wire Wire Line
+	6600 3500 6600 1700
+Wire Wire Line
+	6600 1700 7900 1700
+Connection ~ 7900 1700
+Wire Wire Line
+	7900 1700 7900 1600
 $EndSCHEMATC
diff -r d35594a45cbb -r 5616c5b75dcd expansion.sch
--- a/expansion.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/expansion.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 6 9
+Sheet 6 10
 Title ""
 Date ""
 Rev ""
diff -r d35594a45cbb -r 5616c5b75dcd power.sch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/power.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -0,0 +1,798 @@
+EESchema Schematic File Version 4
+LIBS:AcornElectronMainboard-cache
+EELAYER 26 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 10 10
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector_Generic:Conn_01x03 PL?
+U 1 1 6461644D
+P 850 1300
+AR Path="/6461644D" Ref="PL?"  Part="1" 
+AR Path="/6460C88B/6461644D" Ref="PL3"  Part="1" 
+F 0 "PL3" H 770 1617 50  0000 C CNN
+F 1 "Power" H 770 1526 50  0000 C CNN
+F 2 "" H 850 1300 50  0001 C CNN
+F 3 "~" H 850 1300 50  0001 C CNN
+	1    850  1300
+	-1   0    0    -1  
+$EndComp
+Text GLabel 3150 1200 2    50   Output ~ 0
+5V
+Wire Wire Line
+	1050 1200 1550 1200
+Text GLabel 3150 1700 2    50   Output ~ 0
+0V
+Text GLabel 3150 2200 2    50   Output ~ 0
+-5V
+Wire Wire Line
+	1350 1700 1450 1700
+Wire Wire Line
+	1250 2200 1450 2200
+$Comp
+L Device:C Ax?
+U 1 1 6461645A
+P 2150 1450
+AR Path="/6461645A" Ref="Ax?"  Part="1" 
+AR Path="/6460C88B/6461645A" Ref="Ax19"  Part="1" 
+F 0 "Ax19" H 2265 1496 50  0000 L CNN
+F 1 "47nF" H 2265 1405 50  0000 L CNN
+F 2 "" H 2188 1300 50  0001 C CNN
+F 3 "~" H 2150 1450 50  0001 C CNN
+	1    2150 1450
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:C Ax?
+U 1 1 64616461
+P 2050 1950
+AR Path="/64616461" Ref="Ax?"  Part="1" 
+AR Path="/6460C88B/64616461" Ref="Ax1"  Part="1" 
+F 0 "Ax1" H 2165 1996 50  0000 L CNN
+F 1 "47nF" H 2165 1905 50  0000 L CNN
+F 2 "" H 2088 1800 50  0001 C CNN
+F 3 "~" H 2050 1950 50  0001 C CNN
+	1    2050 1950
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:CP C?
+U 1 1 64616468
+P 1550 1450
+AR Path="/64616468" Ref="C?"  Part="1" 
+AR Path="/6460C88B/64616468" Ref="C1"  Part="1" 
+F 0 "C1" H 1668 1496 50  0000 L CNN
+F 1 "47µF/16V" H 1668 1405 38  0000 L CNN
+F 2 "" H 1588 1300 50  0001 C CNN
+F 3 "~" H 1550 1450 50  0001 C CNN
+	1    1550 1450
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:CP C?
+U 1 1 6461646F
+P 1450 1950
+AR Path="/6461646F" Ref="C?"  Part="1" 
+AR Path="/6460C88B/6461646F" Ref="C2"  Part="1" 
+F 0 "C2" H 1568 1996 50  0000 L CNN
+F 1 "10µF/16V" H 1568 1905 38  0000 L CNN
+F 2 "" H 1488 1800 50  0001 C CNN
+F 3 "~" H 1450 1950 50  0001 C CNN
+	1    1450 1950
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1350 1700 1350 1300
+Wire Wire Line
+	1350 1300 1050 1300
+Wire Wire Line
+	1250 2200 1250 1400
+Wire Wire Line
+	1550 1300 1550 1200
+Connection ~ 1550 1200
+Wire Wire Line
+	1550 1200 2150 1200
+Wire Wire Line
+	1450 1800 1450 1700
+Connection ~ 1450 1700
+Wire Wire Line
+	1450 1700 1550 1700
+Wire Wire Line
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+Connection ~ 1550 1700
+Wire Wire Line
+	1550 1700 2050 1700
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+Connection ~ 1450 2200
+Wire Wire Line
+	1450 2200 2050 2200
+Wire Wire Line
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+Connection ~ 2050 2200
+Wire Wire Line
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+Connection ~ 2050 1700
+Wire Wire Line
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+Wire Wire Line
+	2150 1700 2150 1600
+Connection ~ 2150 1700
+Wire Wire Line
+	2150 1300 2150 1200
+Connection ~ 2150 1200
+$Comp
+L Connector_Generic:Conn_01x02 PL?
+U 1 1 6461648E
+P 850 2700
+AR Path="/6461648E" Ref="PL?"  Part="1" 
+AR Path="/6460C88B/6461648E" Ref="PL4"  Part="1" 
+F 0 "PL4" H 770 2917 50  0000 C CNN
+F 1 "Power" H 770 2826 50  0000 C CNN
+F 2 "" H 850 2700 50  0001 C CNN
+F 3 "~" H 850 2700 50  0001 C CNN
+	1    850  2700
+	-1   0    0    -1  
+$EndComp
+Text Label 1050 1200 0    50   ~ 0
+5V
+Text Label 1050 1300 0    50   ~ 0
+0V
+Wire Wire Line
+	1050 1400 1250 1400
+Text Label 1050 1400 0    50   ~ 0
+-5V
+Text Label 1050 2700 0    50   ~ 0
+RETURN
+Text Label 1050 2800 0    50   ~ 0
+18VAC
+Text GLabel 2050 2700 2    50   UnSpc ~ 0
+POWER_AC_RETURN
+Text GLabel 2050 2800 2    50   UnSpc ~ 0
+POWER_18VAC
+Wire Wire Line
+	1050 2700 1550 2700
+Wire Wire Line
+	1050 2800 1550 2800
+Text Notes 850  3200 0    50   ~ 0
+PL4 introduced for the two separate connections\non the original board.
+$Comp
+L power:PWR_FLAG #FLG?
+U 1 1 646164A0
+P 1550 2700
+AR Path="/646164A0" Ref="#FLG?"  Part="1" 
+AR Path="/6460C88B/646164A0" Ref="#FLG01"  Part="1" 
+F 0 "#FLG01" H 1550 2775 50  0001 C CNN
+F 1 "PWR_FLAG" H 1550 2874 50  0000 C CNN
+F 2 "" H 1550 2700 50  0001 C CNN
+F 3 "~" H 1550 2700 50  0001 C CNN
+	1    1550 2700
+	1    0    0    -1  
+$EndComp
+Connection ~ 1550 2700
+Wire Wire Line
+	1550 2700 2050 2700
+$Comp
+L power:PWR_FLAG #FLG?
+U 1 1 646164A8
+P 1550 2800
+AR Path="/646164A8" Ref="#FLG?"  Part="1" 
+AR Path="/6460C88B/646164A8" Ref="#FLG02"  Part="1" 
+F 0 "#FLG02" H 1550 2875 50  0001 C CNN
+F 1 "PWR_FLAG" H 1550 2973 50  0000 C CNN
+F 2 "" H 1550 2800 50  0001 C CNN
+F 3 "~" H 1550 2800 50  0001 C CNN
+	1    1550 2800
+	-1   0    0    1   
+$EndComp
+Connection ~ 1550 2800
+Wire Wire Line
+	1550 2800 2050 2800
+$Comp
+L power:+5V #PWR?
+U 1 1 646164B0
+P 2950 1000
+AR Path="/646164B0" Ref="#PWR?"  Part="1" 
+AR Path="/6460C88B/646164B0" Ref="#PWR02"  Part="1" 
+F 0 "#PWR02" H 2950 850 50  0001 C CNN
+F 1 "+5V" H 2965 1173 50  0000 C CNN
+F 2 "" H 2950 1000 50  0001 C CNN
+F 3 "" H 2950 1000 50  0001 C CNN
+	1    2950 1000
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 646164B6
+P 2750 1900
+AR Path="/646164B6" Ref="#PWR?"  Part="1" 
+AR Path="/6460C88B/646164B6" Ref="#PWR01"  Part="1" 
+F 0 "#PWR01" H 2750 1650 50  0001 C CNN
+F 1 "GND" H 2755 1727 50  0000 C CNN
+F 2 "" H 2750 1900 50  0001 C CNN
+F 3 "" H 2750 1900 50  0001 C CNN
+	1    2750 1900
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:-5V #PWR?
+U 1 1 646164BC
+P 2950 2000
+AR Path="/646164BC" Ref="#PWR?"  Part="1" 
+AR Path="/6460C88B/646164BC" Ref="#PWR03"  Part="1" 
+F 0 "#PWR03" H 2950 2100 50  0001 C CNN
+F 1 "-5V" H 2965 2173 50  0000 C CNN
+F 2 "" H 2950 2000 50  0001 C CNN
+F 3 "" H 2950 2000 50  0001 C CNN
+	1    2950 2000
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2150 1200 2950 1200
+Wire Wire Line
+	2050 2200 2950 2200
+Wire Wire Line
+	2150 1700 2750 1700
+Connection ~ 2950 1200
+Wire Wire Line
+	2950 1200 3150 1200
+Wire Wire Line
+	2750 1900 2750 1800
+Connection ~ 2750 1700
+Wire Wire Line
+	2750 1700 3150 1700
+Wire Wire Line
+	2950 2200 2950 2100
+Connection ~ 2950 2200
+Wire Wire Line
+	2950 2200 3150 2200
+$Comp
+L power:PWR_FLAG #FLG?
+U 1 1 646164CD
+P 2950 1100
+AR Path="/646164CD" Ref="#FLG?"  Part="1" 
+AR Path="/6460C88B/646164CD" Ref="#FLG04"  Part="1" 
+F 0 "#FLG04" H 2950 1175 50  0001 C CNN
+F 1 "PWR_FLAG" V 2950 1228 50  0000 L CNN
+F 2 "" H 2950 1100 50  0001 C CNN
+F 3 "~" H 2950 1100 50  0001 C CNN
+	1    2950 1100
+	0    -1   -1   0   
+$EndComp
+$Comp
+L power:PWR_FLAG #FLG?
+U 1 1 646164D3
+P 2950 2100
+AR Path="/646164D3" Ref="#FLG?"  Part="1" 
+AR Path="/6460C88B/646164D3" Ref="#FLG05"  Part="1" 
+F 0 "#FLG05" H 2950 2175 50  0001 C CNN
+F 1 "PWR_FLAG" V 2950 2228 50  0000 L CNN
+F 2 "" H 2950 2100 50  0001 C CNN
+F 3 "~" H 2950 2100 50  0001 C CNN
+	1    2950 2100
+	0    1    1    0   
+$EndComp
+$Comp
+L power:PWR_FLAG #FLG?
+U 1 1 646164D9
+P 2750 1800
+AR Path="/646164D9" Ref="#FLG?"  Part="1" 
+AR Path="/6460C88B/646164D9" Ref="#FLG03"  Part="1" 
+F 0 "#FLG03" H 2750 1875 50  0001 C CNN
+F 1 "PWR_FLAG" V 2750 1928 50  0000 L CNN
+F 2 "" H 2750 1800 50  0001 C CNN
+F 3 "~" H 2750 1800 50  0001 C CNN
+	1    2750 1800
+	0    -1   -1   0   
+$EndComp
+Connection ~ 2750 1800
+Wire Wire Line
+	2750 1800 2750 1700
+Wire Wire Line
+	2950 1000 2950 1100
+Connection ~ 2950 1100
+Wire Wire Line
+	2950 1100 2950 1200
+Connection ~ 2950 2100
+Wire Wire Line
+	2950 2000 2950 2100
+$Comp
+L 74xx:74LS08 IC?
+U 5 1 6461B35E
+P 8300 1200
+AR Path="/6461B35E" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/6461B35E" Ref="IC19"  Part="5" 
+F 0 "IC19" V 8700 1200 50  0000 C CNN
+F 1 "74LS08" V 8600 1200 50  0000 C CNN
+F 2 "" H 8300 1200 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 8300 1200 50  0001 C CNN
+	5    8300 1200
+	0    -1   -1   0   
+$EndComp
+Text GLabel 7700 1200 0    50   Input ~ 0
+5V
+Wire Wire Line
+	7700 1200 7800 1200
+Text GLabel 8900 1200 2    50   Input ~ 0
+0V
+Wire Wire Line
+	8900 1200 8800 1200
+$Comp
+L Device:C_Small A?
+U 1 1 6461B369
+P 8300 1700
+AR Path="/61D7EEE8/6461B369" Ref="A?"  Part="1" 
+AR Path="/6461B369" Ref="A?"  Part="1" 
+AR Path="/6460C88B/6461B369" Ref="A18"  Part="1" 
+F 0 "A18" V 8450 1700 50  0000 C CNN
+F 1 "47n/33n decoupler" V 8150 1700 50  0000 C CNN
+F 2 "" H 8300 1700 50  0001 C CNN
+F 3 "~" H 8300 1700 50  0001 C CNN
+	1    8300 1700
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	8800 1700 8400 1700
+Wire Wire Line
+	8200 1700 7800 1700
+Wire Wire Line
+	8800 1700 8800 1200
+Connection ~ 8800 1200
+Wire Wire Line
+	7800 1700 7800 1200
+Connection ~ 7800 1200
+$Comp
+L 74xx:74LS86 IC?
+U 5 1 6462D6A5
+P 6400 1200
+AR Path="/61DB955D/61DF7FF4/6462D6A5" Ref="IC?"  Part="5" 
+AR Path="/62411C42/6462D6A5" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/6462D6A5" Ref="IC15"  Part="5" 
+F 0 "IC15" V 6800 1200 50  0000 C CNN
+F 1 "74LS86" V 6700 1200 50  0000 C CNN
+F 2 "" H 6400 1200 50  0001 C CNN
+F 3 "74xx/74ls86.pdf" H 6400 1200 50  0001 C CNN
+	5    6400 1200
+	0    -1   -1   0   
+$EndComp
+Text GLabel 5800 1200 0    50   Input ~ 0
+5V
+Text GLabel 7000 1200 2    50   Input ~ 0
+0V
+Wire Wire Line
+	5800 1200 5900 1200
+Wire Wire Line
+	6900 1200 7000 1200
+$Comp
+L 74xx:74LS00 IC?
+U 5 1 6462D6B0
+P 6400 2500
+AR Path="/61DB955D/61DF7FF4/6462D6B0" Ref="IC?"  Part="5" 
+AR Path="/62411C42/6462D6B0" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/6462D6B0" Ref="IC16"  Part="5" 
+F 0 "IC16" V 6800 2500 50  0000 C CNN
+F 1 "74LS00" V 6700 2500 50  0000 C CNN
+F 2 "" H 6400 2500 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 6400 2500 50  0001 C CNN
+	5    6400 2500
+	0    -1   -1   0   
+$EndComp
+Text GLabel 7000 2500 2    50   Input ~ 0
+0V
+Text GLabel 5800 2500 0    50   Input ~ 0
+5V
+Wire Wire Line
+	5900 2500 5800 2500
+Wire Wire Line
+	7000 2500 6900 2500
+$Comp
+L 74xx:74LS74 IC?
+U 3 1 64640CAE
+P 4500 3800
+AR Path="/61DB955D/61DF7FF4/64640CAE" Ref="IC?"  Part="3" 
+AR Path="/62411C42/64640CAE" Ref="IC?"  Part="3" 
+AR Path="/6460C88B/64640CAE" Ref="IC12"  Part="3" 
+F 0 "IC12" V 4900 3800 50  0000 C CNN
+F 1 "74LS74" V 4800 3800 50  0000 C CNN
+F 2 "" H 4500 3800 50  0001 C CNN
+F 3 "74xx/74hc_hct74.pdf" H 4500 3800 50  0001 C CNN
+	3    4500 3800
+	0    -1   -1   0   
+$EndComp
+Text GLabel 3900 3800 0    50   Input ~ 0
+5V
+Text GLabel 5100 3800 2    50   Input ~ 0
+0V
+Wire Wire Line
+	5100 3800 5000 3800
+Wire Wire Line
+	4100 3800 4000 3800
+$Comp
+L 74xx:74LS86 IC?
+U 5 1 64640CB9
+P 4500 6400
+AR Path="/61DB955D/61DF7FF4/64640CB9" Ref="IC?"  Part="5" 
+AR Path="/62411C42/64640CB9" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/64640CB9" Ref="IC14"  Part="5" 
+F 0 "IC14" V 4900 6400 50  0000 C CNN
+F 1 "74LS86" V 4800 6400 50  0000 C CNN
+F 2 "" H 4500 6400 50  0001 C CNN
+F 3 "74xx/74ls86.pdf" H 4500 6400 50  0001 C CNN
+	5    4500 6400
+	0    -1   -1   0   
+$EndComp
+Text GLabel 3900 6400 0    50   Input ~ 0
+5V
+Text GLabel 5100 6400 2    50   Input ~ 0
+0V
+Wire Wire Line
+	3900 6400 4000 6400
+Wire Wire Line
+	5000 6400 5100 6400
+$Comp
+L 74xx:74LS74 IC?
+U 3 1 64652B99
+P 4500 2500
+AR Path="/61DB955D/61DF7FF4/64652B99" Ref="IC?"  Part="3" 
+AR Path="/62411C42/64652B99" Ref="IC?"  Part="3" 
+AR Path="/6460C88B/64652B99" Ref="IC11"  Part="3" 
+F 0 "IC11" V 4900 2500 50  0000 C CNN
+F 1 "74LS74" V 4800 2500 50  0000 C CNN
+F 2 "" H 4500 2500 50  0001 C CNN
+F 3 "74xx/74hc_hct74.pdf" H 4500 2500 50  0001 C CNN
+	3    4500 2500
+	0    -1   -1   0   
+$EndComp
+Text GLabel 3900 2500 0    50   Input ~ 0
+5V
+Text GLabel 5100 2500 2    50   Input ~ 0
+0V
+Wire Wire Line
+	5100 2500 5000 2500
+Wire Wire Line
+	4100 2500 4000 2500
+$Comp
+L 74xx:74LS00 IC?
+U 5 1 64663FDB
+P 4500 1200
+AR Path="/61DB955D/61DF7FF4/64663FDB" Ref="IC?"  Part="5" 
+AR Path="/62411C42/64663FDB" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/64663FDB" Ref="IC10"  Part="5" 
+F 0 "IC10" V 4900 1200 50  0000 C CNN
+F 1 "74LS00" V 4800 1200 50  0000 C CNN
+F 2 "" H 4500 1200 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 4500 1200 50  0001 C CNN
+	5    4500 1200
+	0    -1   -1   0   
+$EndComp
+Text GLabel 5100 1200 2    50   Input ~ 0
+0V
+Text GLabel 3900 1200 0    50   Input ~ 0
+5V
+Wire Wire Line
+	5100 1200 5000 1200
+$Comp
+L Device:C_Small A?
+U 1 1 646919C3
+P 4500 1700
+AR Path="/61D7EEE8/646919C3" Ref="A?"  Part="1" 
+AR Path="/646919C3" Ref="A?"  Part="1" 
+AR Path="/6460C88B/646919C3" Ref="A10"  Part="1" 
+F 0 "A10" V 4650 1700 50  0000 C CNN
+F 1 "47n/33n decoupler" V 4350 1700 50  0000 C CNN
+F 2 "" H 4500 1700 50  0001 C CNN
+F 3 "~" H 4500 1700 50  0001 C CNN
+	1    4500 1700
+	0    1    1    0   
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+	4000 1700 4400 1700
+Connection ~ 4000 1200
+Wire Wire Line
+	4000 1200 3900 1200
+Wire Wire Line
+	4600 1700 5000 1700
+Wire Wire Line
+	5000 1700 5000 1200
+Connection ~ 5000 1200
+$Comp
+L Device:C_Small A?
+U 1 1 64697A6B
+P 4500 3000
+AR Path="/61D7EEE8/64697A6B" Ref="A?"  Part="1" 
+AR Path="/64697A6B" Ref="A?"  Part="1" 
+AR Path="/6460C88B/64697A6B" Ref="A11"  Part="1" 
+F 0 "A11" V 4650 3000 50  0000 C CNN
+F 1 "47n/33n decoupler" V 4350 3000 50  0000 C CNN
+F 2 "" H 4500 3000 50  0001 C CNN
+F 3 "~" H 4500 3000 50  0001 C CNN
+	1    4500 3000
+	0    1    1    0   
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+	4000 3000 4400 3000
+Connection ~ 4000 2500
+Wire Wire Line
+	4000 2500 3900 2500
+Wire Wire Line
+	4600 3000 5000 3000
+Wire Wire Line
+	5000 3000 5000 2500
+Connection ~ 5000 2500
+Wire Wire Line
+	5000 2500 4900 2500
+$Comp
+L Device:C_Small A?
+U 1 1 6469C3A3
+P 4500 4300
+AR Path="/61D7EEE8/6469C3A3" Ref="A?"  Part="1" 
+AR Path="/6469C3A3" Ref="A?"  Part="1" 
+AR Path="/6460C88B/6469C3A3" Ref="A12"  Part="1" 
+F 0 "A12" V 4650 4300 50  0000 C CNN
+F 1 "47n/33n decoupler" V 4350 4300 50  0000 C CNN
+F 2 "" H 4500 4300 50  0001 C CNN
+F 3 "~" H 4500 4300 50  0001 C CNN
+	1    4500 4300
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	4000 3800 4000 4300
+Wire Wire Line
+	4000 4300 4400 4300
+Connection ~ 4000 3800
+Wire Wire Line
+	4000 3800 3900 3800
+Wire Wire Line
+	4600 4300 5000 4300
+Wire Wire Line
+	5000 4300 5000 3800
+Connection ~ 5000 3800
+Wire Wire Line
+	5000 3800 4900 3800
+$Comp
+L Device:C_Small A?
+U 1 1 646A9C11
+P 6400 1700
+AR Path="/61D7EEE8/646A9C11" Ref="A?"  Part="1" 
+AR Path="/646A9C11" Ref="A?"  Part="1" 
+AR Path="/6460C88B/646A9C11" Ref="A14"  Part="1" 
+F 0 "A14" V 6550 1700 50  0000 C CNN
+F 1 "47n/33n decoupler" V 6250 1700 50  0000 C CNN
+F 2 "" H 6400 1700 50  0001 C CNN
+F 3 "~" H 6400 1700 50  0001 C CNN
+	1    6400 1700
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:C_Small A?
+U 1 1 646A9C75
+P 4500 6900
+AR Path="/61D7EEE8/646A9C75" Ref="A?"  Part="1" 
+AR Path="/646A9C75" Ref="A?"  Part="1" 
+AR Path="/6460C88B/646A9C75" Ref="A13"  Part="1" 
+F 0 "A13" V 4650 6900 50  0000 C CNN
+F 1 "47n/33n decoupler" V 4350 6900 50  0000 C CNN
+F 2 "" H 4500 6900 50  0001 C CNN
+F 3 "~" H 4500 6900 50  0001 C CNN
+	1    4500 6900
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	5900 1200 5900 1700
+Wire Wire Line
+	5900 1700 6300 1700
+Connection ~ 5900 1200
+Wire Wire Line
+	6500 1700 6900 1700
+Wire Wire Line
+	6900 1700 6900 1200
+Connection ~ 6900 1200
+Wire Wire Line
+	4000 6400 4000 6900
+Wire Wire Line
+	4000 6900 4400 6900
+Connection ~ 4000 6400
+Wire Wire Line
+	4600 6900 5000 6900
+Wire Wire Line
+	5000 6900 5000 6400
+Connection ~ 5000 6400
+$Comp
+L Device:C_Small A?
+U 1 1 646B9B14
+P 6400 3000
+AR Path="/61D7EEE8/646B9B14" Ref="A?"  Part="1" 
+AR Path="/646B9B14" Ref="A?"  Part="1" 
+AR Path="/6460C88B/646B9B14" Ref="A15"  Part="1" 
+F 0 "A15" V 6550 3000 50  0000 C CNN
+F 1 "47n/33n decoupler" V 6250 3000 50  0000 C CNN
+F 2 "" H 6400 3000 50  0001 C CNN
+F 3 "~" H 6400 3000 50  0001 C CNN
+	1    6400 3000
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	5900 2500 5900 3000
+Wire Wire Line
+	5900 3000 6300 3000
+Connection ~ 5900 2500
+Wire Wire Line
+	6500 3000 6900 3000
+Wire Wire Line
+	6900 3000 6900 2500
+Connection ~ 6900 2500
+$Comp
+L 74xx:74LS08 IC?
+U 5 1 646C3EC4
+P 6400 5100
+AR Path="/61F2273C/646C3EC4" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/646C3EC4" Ref="IC18"  Part="5" 
+F 0 "IC18" V 6800 5100 50  0000 C CNN
+F 1 "74LS08" V 6700 5100 50  0000 C CNN
+F 2 "" H 6400 5100 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 6400 5100 50  0001 C CNN
+	5    6400 5100
+	0    -1   -1   0   
+$EndComp
+Text GLabel 5800 5100 0    50   Input ~ 0
+5V
+Wire Wire Line
+	5800 5100 5900 5100
+Text GLabel 7000 5100 2    50   Input ~ 0
+0V
+Wire Wire Line
+	7000 5100 6900 5100
+$Comp
+L Device:C_Small A?
+U 1 1 646CAC33
+P 6400 5600
+AR Path="/61D7EEE8/646CAC33" Ref="A?"  Part="1" 
+AR Path="/646CAC33" Ref="A?"  Part="1" 
+AR Path="/6460C88B/646CAC33" Ref="A17"  Part="1" 
+F 0 "A17" V 6550 5600 50  0000 C CNN
+F 1 "47n/33n decoupler" V 6250 5600 50  0000 C CNN
+F 2 "" H 6400 5600 50  0001 C CNN
+F 3 "~" H 6400 5600 50  0001 C CNN
+	1    6400 5600
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	5900 5100 5900 5600
+Wire Wire Line
+	5900 5600 6300 5600
+Connection ~ 5900 5100
+Wire Wire Line
+	6500 5600 6900 5600
+Wire Wire Line
+	6900 5600 6900 5100
+Connection ~ 6900 5100
+$Comp
+L 74xx:74LS00 IC?
+U 5 1 646D1448
+P 6400 3800
+AR Path="/61DF4BC2/646D1448" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/646D1448" Ref="IC17"  Part="5" 
+F 0 "IC17" V 6800 3800 50  0000 C CNN
+F 1 "74LS00" V 6700 3800 50  0000 C CNN
+F 2 "" H 6400 3800 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 6400 3800 50  0001 C CNN
+	5    6400 3800
+	0    -1   -1   0   
+$EndComp
+Text GLabel 5800 3800 0    50   Input ~ 0
+5V
+Text GLabel 7000 3800 2    50   Input ~ 0
+0V
+Wire Wire Line
+	5900 3800 5800 3800
+Wire Wire Line
+	7000 3800 6900 3800
+$Comp
+L Device:C_Small A?
+U 1 1 646D706B
+P 6400 4300
+AR Path="/61D7EEE8/646D706B" Ref="A?"  Part="1" 
+AR Path="/646D706B" Ref="A?"  Part="1" 
+AR Path="/6460C88B/646D706B" Ref="A16"  Part="1" 
+F 0 "A16" V 6550 4300 50  0000 C CNN
+F 1 "47n/33n decoupler" V 6250 4300 50  0000 C CNN
+F 2 "" H 6400 4300 50  0001 C CNN
+F 3 "~" H 6400 4300 50  0001 C CNN
+	1    6400 4300
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	5900 3800 5900 4300
+Wire Wire Line
+	5900 4300 6300 4300
+Connection ~ 5900 3800
+Wire Wire Line
+	6500 4300 6900 4300
+Wire Wire Line
+	6900 4300 6900 3800
+Connection ~ 6900 3800
+$Comp
+L Amplifier_Operational:LM324 IC?
+U 5 1 646E146E
+P 4500 5000
+AR Path="/624B50A6/646E146E" Ref="IC?"  Part="5" 
+AR Path="/6460C88B/646E146E" Ref="IC13"  Part="5" 
+F 0 "IC13" V 4800 5000 50  0000 C CNN
+F 1 "LM324" V 4700 5000 50  0000 C CNN
+F 2 "" H 4450 5100 50  0001 C CNN
+F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 4550 5200 50  0001 C CNN
+	5    4500 5000
+	0    -1   -1   0   
+$EndComp
+Text GLabel 5100 5100 2    50   Input ~ 0
+-5V
+Text GLabel 3900 5100 0    50   Input ~ 0
+5V
+Wire Wire Line
+	4200 5100 3900 5100
+Wire Wire Line
+	5100 5100 4800 5100
+$Comp
+L 74xx:74LS04 IC8
+U 7 1 647088BB
+P 2600 5100
+F 0 "IC8" V 2967 5100 50  0000 C CNN
+F 1 "74LS04" V 2876 5100 50  0000 C CNN
+F 2 "" H 2600 5100 50  0001 C CNN
+F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2600 5100 50  0001 C CNN
+	7    2600 5100
+	0    -1   -1   0   
+$EndComp
+Text GLabel 3200 5100 2    50   Input ~ 0
+0V
+Text GLabel 2000 5100 0    50   Input ~ 0
+5V
+$Comp
+L Device:C_Small A?
+U 1 1 6470DED4
+P 2600 5600
+AR Path="/61D7EEE8/6470DED4" Ref="A?"  Part="1" 
+AR Path="/6470DED4" Ref="A?"  Part="1" 
+AR Path="/6460C88B/6470DED4" Ref="A9"  Part="1" 
+F 0 "A9" V 2750 5600 50  0000 C CNN
+F 1 "47n/33n decoupler" V 2450 5600 50  0000 C CNN
+F 2 "" H 2600 5600 50  0001 C CNN
+F 3 "~" H 2600 5600 50  0001 C CNN
+	1    2600 5600
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	2000 5100 2100 5100
+Wire Wire Line
+	2100 5100 2100 5600
+Wire Wire Line
+	2100 5600 2500 5600
+Connection ~ 2100 5100
+Wire Wire Line
+	2700 5600 3100 5600
+Wire Wire Line
+	3100 5600 3100 5100
+Wire Wire Line
+	3100 5100 3200 5100
+Connection ~ 3100 5100
+Text Notes 2300 6850 0    50   ~ 0
+See clocks for IC9.
+Text Notes 2300 4300 0    50   ~ 0
+See ULA for IC1.\nSee ROM for IC2.\nSee CPU for IC3.\nSee RAM for IC4, IC5, IC6, IC7.
+Text Notes 8000 3000 0    50   ~ 0
+See RAM for IC20.
+$EndSCHEMATC
diff -r d35594a45cbb -r 5616c5b75dcd sound.sch
--- a/sound.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/sound.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 5 9
+Sheet 5 10
 Title ""
 Date ""
 Rev ""
diff -r d35594a45cbb -r 5616c5b75dcd video.sch
--- a/video.sch	Mon Jan 23 00:37:25 2023 +0100
+++ b/video.sch	Tue Jan 24 21:56:51 2023 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 8 9
+Sheet 8 10
 Title ""
 Date ""
 Rev ""