# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1645891424 -3600
# Node ID aec8f8ba49a9b6292d217c5851664385c464846a
# Parent  aa42a38b72f093fcdac64935209948736a9b454a
Added a sheet with the keyboard matrix circuit.

diff -r aa42a38b72f0 -r aec8f8ba49a9 AcornElectron.lib
--- a/AcornElectron.lib	Thu Feb 24 18:52:07 2022 +0100
+++ b/AcornElectron.lib	Sat Feb 26 17:03:44 2022 +0100
@@ -110,6 +110,19 @@
 ENDDRAW
 ENDDEF
 #
+# Keyswitch
+#
+DEF Keyswitch SW 0 40 Y Y 1 F N
+F0 "SW" 0 150 50 H V C CNN
+F1 "Keyswitch" 0 50 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+X COL 1 -200 0 100 D 25 25 1 1 P
+X ROW 2 0 -250 100 L 25 25 1 1 P
+ENDDRAW
+ENDDEF
+#
 # ULA12C021
 #
 DEF ULA12C021 U 0 40 Y Y 1 F N
diff -r aa42a38b72f0 -r aec8f8ba49a9 AcornElectronMainboard.sch
--- a/AcornElectronMainboard.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/AcornElectronMainboard.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 8268 11693 portrait
 encoding utf-8
-Sheet 1 9
+Sheet 1 10
 Title "Acorn Electron Mainboard"
 Date ""
 Rev ""
@@ -984,6 +984,12 @@
 	3800 1350 3800 1200
 Text Notes 4550 1400 0    50   ~ 0
 Note that KiCad gets upset\nwhen connecting passives\nto power input pins.
+$Sheet
+S 1300 7300 700  300 
+U 621BBAD2
+F0 "Keyboard matrix" 50
+F1 "KBD.sch" 50
+$EndSheet
 Wire Bus Line
 	2100 1600 2100 1900
 Wire Bus Line
diff -r aa42a38b72f0 -r aec8f8ba49a9 CPU_ROM_KBD.sch
--- a/CPU_ROM_KBD.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/CPU_ROM_KBD.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 7 9
+Sheet 7 10
 Title ""
 Date ""
 Rev ""
diff -r aa42a38b72f0 -r aec8f8ba49a9 KBD.sch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/KBD.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -0,0 +1,1387 @@
+EESchema Schematic File Version 4
+LIBS:AcornElectronMainboard-cache
+EELAYER 26 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 10 10
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector_Generic:Conn_01x22 PL?
+U 1 1 621BBC68
+P 2000 1000
+AR Path="/621BBC68" Ref="PL?"  Part="1" 
+AR Path="/61F2273C/621BBC68" Ref="PL?"  Part="1" 
+AR Path="/621BBAD2/621BBC68" Ref="PL2a"  Part="1" 
+F 0 "PL2a" V 2250 1000 50  0000 C CNN
+F 1 "Keyboard" V 2150 1000 50  0000 C CNN
+F 2 "" H 2000 1000 50  0001 C CNN
+F 3 "~" H 2000 1000 50  0001 C CNN
+	1    2000 1000
+	0    -1   -1   0   
+$EndComp
+Wire Wire Line
+	1800 1200 1800 2800
+Wire Wire Line
+	1900 1200 1900 2700
+Wire Wire Line
+	2000 1200 2000 2600
+Wire Wire Line
+	2100 1200 2100 2500
+Wire Wire Line
+	2200 1200 2200 2400
+Wire Wire Line
+	2300 1200 2300 2300
+Wire Wire Line
+	2400 1200 2400 2200
+Wire Wire Line
+	2500 1200 2500 2100
+Wire Wire Line
+	2600 1200 2600 2000
+Wire Wire Line
+	2700 1200 2700 1400
+Wire Wire Line
+	2800 1200 2800 1500
+Wire Wire Line
+	2900 1200 2900 1650
+Wire Wire Line
+	3000 1200 3000 1800
+Wire Wire Line
+	3100 1200 3100 1900
+Text Label 2700 1200 3    50   ~ 0
+A0
+Text Label 2800 1200 3    50   ~ 0
+A1
+Text Label 2900 1200 3    50   ~ 0
+A2
+Text Label 3000 1200 3    50   ~ 0
+A3
+Text Label 3100 1200 3    50   ~ 0
+A4
+Text Label 1800 1200 3    50   ~ 0
+A13
+Text Label 1900 1200 3    50   ~ 0
+A12
+Text Label 2000 1200 3    50   ~ 0
+A11
+Text Label 2100 1200 3    50   ~ 0
+A10
+Text Label 2200 1200 3    50   ~ 0
+A9
+Text Label 2300 1200 3    50   ~ 0
+A8
+Text Label 2400 1200 3    50   ~ 0
+A7
+Text Label 2500 1200 3    50   ~ 0
+A6
+Text Label 2600 1200 3    50   ~ 0
+A5
+Wire Wire Line
+	1100 5400 1100 1200
+Text Label 1000 1200 3    50   ~ 0
+BREAK
+Text Label 1100 1200 3    50   ~ 0
+CAPS_LOCK
+Text Label 1200 1200 3    50   ~ 0
+0V
+Text Label 1300 1200 3    50   ~ 0
+5V
+Text Label 1400 1200 3    50   ~ 0
+KBD0
+Text Label 1500 1200 3    50   ~ 0
+KBD1
+Text Label 1600 1200 3    50   ~ 0
+KBD2
+Text Label 1700 1200 3    50   ~ 0
+KBD3
+Wire Wire Line
+	1400 1200 1400 3600
+Wire Wire Line
+	1500 1200 1500 4200
+Wire Wire Line
+	1600 1200 1600 4800
+Wire Wire Line
+	1700 1200 1700 5400
+Wire Wire Line
+	1200 1200 1200 1700
+Wire Wire Line
+	1300 1200 1300 1500
+Wire Wire Line
+	1000 1900 1000 1200
+$Comp
+L Device:D D?
+U 1 1 621BEC4B
+P 2400 2950
+F 0 "D?" V 2354 3029 50  0000 L CNN
+F 1 "D" V 2445 3029 50  0000 L CNN
+F 2 "" H 2400 2950 50  0001 C CNN
+F 3 "~" H 2400 2950 50  0001 C CNN
+	1    2400 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BED3A
+P 3000 2950
+F 0 "D?" V 2954 3029 50  0000 L CNN
+F 1 "D" V 3045 3029 50  0000 L CNN
+F 2 "" H 3000 2950 50  0001 C CNN
+F 3 "~" H 3000 2950 50  0001 C CNN
+	1    3000 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BED66
+P 3600 2950
+F 0 "D?" V 3554 3029 50  0000 L CNN
+F 1 "D" V 3645 3029 50  0000 L CNN
+F 2 "" H 3600 2950 50  0001 C CNN
+F 3 "~" H 3600 2950 50  0001 C CNN
+	1    3600 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEDAE
+P 4200 2950
+F 0 "D?" V 4154 3029 50  0000 L CNN
+F 1 "D" V 4245 3029 50  0000 L CNN
+F 2 "" H 4200 2950 50  0001 C CNN
+F 3 "~" H 4200 2950 50  0001 C CNN
+	1    4200 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEDD0
+P 4800 2950
+F 0 "D?" V 4754 3029 50  0000 L CNN
+F 1 "D" V 4845 3029 50  0000 L CNN
+F 2 "" H 4800 2950 50  0001 C CNN
+F 3 "~" H 4800 2950 50  0001 C CNN
+	1    4800 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEE37
+P 5400 2950
+F 0 "D?" V 5354 3029 50  0000 L CNN
+F 1 "D" V 5445 3029 50  0000 L CNN
+F 2 "" H 5400 2950 50  0001 C CNN
+F 3 "~" H 5400 2950 50  0001 C CNN
+	1    5400 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEE5C
+P 6000 2950
+F 0 "D?" V 5954 3029 50  0000 L CNN
+F 1 "D" V 6045 3029 50  0000 L CNN
+F 2 "" H 6000 2950 50  0001 C CNN
+F 3 "~" H 6000 2950 50  0001 C CNN
+	1    6000 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEE7D
+P 6600 2950
+F 0 "D?" V 6554 3029 50  0000 L CNN
+F 1 "D" V 6645 3029 50  0000 L CNN
+F 2 "" H 6600 2950 50  0001 C CNN
+F 3 "~" H 6600 2950 50  0001 C CNN
+	1    6600 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEEBC
+P 7200 2950
+F 0 "D?" V 7154 3029 50  0000 L CNN
+F 1 "D" V 7245 3029 50  0000 L CNN
+F 2 "" H 7200 2950 50  0001 C CNN
+F 3 "~" H 7200 2950 50  0001 C CNN
+	1    7200 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEF0F
+P 7800 2950
+F 0 "D?" V 7754 3029 50  0000 L CNN
+F 1 "D" V 7845 3029 50  0000 L CNN
+F 2 "" H 7800 2950 50  0001 C CNN
+F 3 "~" H 7800 2950 50  0001 C CNN
+	1    7800 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEF3F
+P 8400 2950
+F 0 "D?" V 8354 3029 50  0000 L CNN
+F 1 "D" V 8445 3029 50  0000 L CNN
+F 2 "" H 8400 2950 50  0001 C CNN
+F 3 "~" H 8400 2950 50  0001 C CNN
+	1    8400 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEF7E
+P 9000 2950
+F 0 "D?" V 8954 3029 50  0000 L CNN
+F 1 "D" V 9045 3029 50  0000 L CNN
+F 2 "" H 9000 2950 50  0001 C CNN
+F 3 "~" H 9000 2950 50  0001 C CNN
+	1    9000 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEFA9
+P 9600 2950
+F 0 "D?" V 9554 3029 50  0000 L CNN
+F 1 "D" V 9645 3029 50  0000 L CNN
+F 2 "" H 9600 2950 50  0001 C CNN
+F 3 "~" H 9600 2950 50  0001 C CNN
+	1    9600 2950
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:D D?
+U 1 1 621BEFDC
+P 10200 2950
+F 0 "D?" V 10154 3029 50  0000 L CNN
+F 1 "D" V 10245 3029 50  0000 L CNN
+F 2 "" H 10200 2950 50  0001 C CNN
+F 3 "~" H 10200 2950 50  0001 C CNN
+	1    10200 2950
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	1900 2700 3000 2700
+Wire Wire Line
+	3000 2700 3000 2800
+Wire Wire Line
+	2000 2600 3600 2600
+Wire Wire Line
+	3600 2600 3600 2800
+Wire Wire Line
+	2100 2500 4200 2500
+Wire Wire Line
+	4200 2500 4200 2800
+Wire Wire Line
+	2200 2400 4800 2400
+Wire Wire Line
+	4800 2400 4800 2800
+Wire Wire Line
+	2300 2300 5400 2300
+Wire Wire Line
+	5400 2300 5400 2800
+Wire Wire Line
+	2400 2200 6000 2200
+Wire Wire Line
+	6000 2200 6000 2800
+Wire Wire Line
+	2500 2100 6600 2100
+Wire Wire Line
+	6600 2100 6600 2800
+Wire Wire Line
+	2600 2000 7200 2000
+Wire Wire Line
+	7200 2000 7200 2800
+Wire Wire Line
+	3100 1900 7800 1900
+Wire Wire Line
+	7800 1900 7800 2800
+Wire Wire Line
+	3000 1800 8400 1800
+Wire Wire Line
+	8400 1800 8400 2800
+Wire Wire Line
+	2900 1650 9000 1650
+Wire Wire Line
+	9000 1650 9000 2800
+Wire Wire Line
+	2800 1500 9600 1500
+Wire Wire Line
+	9600 1500 9600 2800
+Wire Wire Line
+	2700 1400 10200 1400
+Wire Wire Line
+	10200 1400 10200 2800
+Wire Wire Line
+	1800 2800 2400 2800
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BB705
+P 2400 3600
+F 0 "SW?" H 2139 3519 50  0000 R CNN
+F 1 "Escape" H 2139 3428 50  0000 R CNN
+F 2 "" H 2400 3600 50  0001 C CNN
+F 3 "" H 2400 3600 50  0001 C CNN
+	1    2400 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BBA2F
+P 2400 4200
+F 0 "SW?" H 2139 4119 50  0000 R CNN
+F 1 "Caps/Func" H 2139 4028 50  0000 R CNN
+F 2 "" H 2400 4200 50  0001 C CNN
+F 3 "" H 2400 4200 50  0001 C CNN
+	1    2400 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BBA80
+P 2400 4800
+F 0 "SW?" H 2139 4719 50  0000 R CNN
+F 1 "Ctrl" H 2139 4628 50  0000 R CNN
+F 2 "" H 2400 4800 50  0001 C CNN
+F 3 "" H 2400 4800 50  0001 C CNN
+	1    2400 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BBAC3
+P 2400 5400
+F 0 "SW?" H 2139 5319 50  0000 R CNN
+F 1 "Shift" H 2139 5228 50  0000 R CNN
+F 2 "" H 2400 5400 50  0001 C CNN
+F 3 "" H 2400 5400 50  0001 C CNN
+	1    2400 5400
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2400 5650 2400 5050
+Connection ~ 2400 3850
+Wire Wire Line
+	2400 3850 2400 3100
+Connection ~ 2400 4450
+Wire Wire Line
+	2400 4450 2400 3850
+Connection ~ 2400 5050
+Wire Wire Line
+	2400 5050 2400 4450
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC5F2
+P 3000 3600
+F 0 "SW?" H 2739 3519 50  0000 R CNN
+F 1 "1" H 2739 3428 50  0000 R CNN
+F 2 "" H 3000 3600 50  0001 C CNN
+F 3 "" H 3000 3600 50  0001 C CNN
+	1    3000 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC63C
+P 3000 4200
+F 0 "SW?" H 2739 4119 50  0000 R CNN
+F 1 "Q" H 2739 4028 50  0000 R CNN
+F 2 "" H 3000 4200 50  0001 C CNN
+F 3 "" H 3000 4200 50  0001 C CNN
+	1    3000 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC68F
+P 3000 4800
+F 0 "SW?" H 2739 4719 50  0000 R CNN
+F 1 "A" H 2739 4628 50  0000 R CNN
+F 2 "" H 3000 4800 50  0001 C CNN
+F 3 "" H 3000 4800 50  0001 C CNN
+	1    3000 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC6E4
+P 3000 5400
+F 0 "SW?" H 2739 5319 50  0000 R CNN
+F 1 "Z" H 2739 5228 50  0000 R CNN
+F 2 "" H 3000 5400 50  0001 C CNN
+F 3 "" H 3000 5400 50  0001 C CNN
+	1    3000 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC739
+P 3600 3600
+F 0 "SW?" H 3339 3519 50  0000 R CNN
+F 1 "2" H 3339 3428 50  0000 R CNN
+F 2 "" H 3600 3600 50  0001 C CNN
+F 3 "" H 3600 3600 50  0001 C CNN
+	1    3600 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC78E
+P 3600 4200
+F 0 "SW?" H 3339 4119 50  0000 R CNN
+F 1 "W" H 3339 4028 50  0000 R CNN
+F 2 "" H 3600 4200 50  0001 C CNN
+F 3 "" H 3600 4200 50  0001 C CNN
+	1    3600 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC7EF
+P 3600 4800
+F 0 "SW?" H 3339 4719 50  0000 R CNN
+F 1 "S" H 3339 4628 50  0000 R CNN
+F 2 "" H 3600 4800 50  0001 C CNN
+F 3 "" H 3600 4800 50  0001 C CNN
+	1    3600 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC84C
+P 3600 5400
+F 0 "SW?" H 3339 5319 50  0000 R CNN
+F 1 "X" H 3339 5228 50  0000 R CNN
+F 2 "" H 3600 5400 50  0001 C CNN
+F 3 "" H 3600 5400 50  0001 C CNN
+	1    3600 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC8A7
+P 4200 3600
+F 0 "SW?" H 3939 3519 50  0000 R CNN
+F 1 "3" H 3939 3428 50  0000 R CNN
+F 2 "" H 4200 3600 50  0001 C CNN
+F 3 "" H 4200 3600 50  0001 C CNN
+	1    4200 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC91C
+P 4200 4200
+F 0 "SW?" H 3939 4119 50  0000 R CNN
+F 1 "E" H 3939 4028 50  0000 R CNN
+F 2 "" H 4200 4200 50  0001 C CNN
+F 3 "" H 4200 4200 50  0001 C CNN
+	1    4200 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC96D
+P 4200 4800
+F 0 "SW?" H 3939 4719 50  0000 R CNN
+F 1 "D" H 3939 4628 50  0000 R CNN
+F 2 "" H 4200 4800 50  0001 C CNN
+F 3 "" H 4200 4800 50  0001 C CNN
+	1    4200 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BC9BE
+P 4200 5400
+F 0 "SW?" H 3939 5319 50  0000 R CNN
+F 1 "C" H 3939 5228 50  0000 R CNN
+F 2 "" H 4200 5400 50  0001 C CNN
+F 3 "" H 4200 5400 50  0001 C CNN
+	1    4200 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCEF6
+P 4800 3600
+F 0 "SW?" H 4539 3519 50  0000 R CNN
+F 1 "4" H 4539 3428 50  0000 R CNN
+F 2 "" H 4800 3600 50  0001 C CNN
+F 3 "" H 4800 3600 50  0001 C CNN
+	1    4800 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCEFD
+P 4800 4200
+F 0 "SW?" H 4539 4119 50  0000 R CNN
+F 1 "R" H 4539 4028 50  0000 R CNN
+F 2 "" H 4800 4200 50  0001 C CNN
+F 3 "" H 4800 4200 50  0001 C CNN
+	1    4800 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF04
+P 4800 4800
+F 0 "SW?" H 4539 4719 50  0000 R CNN
+F 1 "F" H 4539 4628 50  0000 R CNN
+F 2 "" H 4800 4800 50  0001 C CNN
+F 3 "" H 4800 4800 50  0001 C CNN
+	1    4800 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF0B
+P 4800 5400
+F 0 "SW?" H 4539 5319 50  0000 R CNN
+F 1 "V" H 4539 5228 50  0000 R CNN
+F 2 "" H 4800 5400 50  0001 C CNN
+F 3 "" H 4800 5400 50  0001 C CNN
+	1    4800 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF12
+P 5400 3600
+F 0 "SW?" H 5139 3519 50  0000 R CNN
+F 1 "5" H 5139 3428 50  0000 R CNN
+F 2 "" H 5400 3600 50  0001 C CNN
+F 3 "" H 5400 3600 50  0001 C CNN
+	1    5400 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF19
+P 5400 4200
+F 0 "SW?" H 5139 4119 50  0000 R CNN
+F 1 "T" H 5139 4028 50  0000 R CNN
+F 2 "" H 5400 4200 50  0001 C CNN
+F 3 "" H 5400 4200 50  0001 C CNN
+	1    5400 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF20
+P 5400 4800
+F 0 "SW?" H 5139 4719 50  0000 R CNN
+F 1 "G" H 5139 4628 50  0000 R CNN
+F 2 "" H 5400 4800 50  0001 C CNN
+F 3 "" H 5400 4800 50  0001 C CNN
+	1    5400 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF27
+P 5400 5400
+F 0 "SW?" H 5139 5319 50  0000 R CNN
+F 1 "B" H 5139 5228 50  0000 R CNN
+F 2 "" H 5400 5400 50  0001 C CNN
+F 3 "" H 5400 5400 50  0001 C CNN
+	1    5400 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF2E
+P 6000 3600
+F 0 "SW?" H 5739 3519 50  0000 R CNN
+F 1 "6" H 5739 3428 50  0000 R CNN
+F 2 "" H 6000 3600 50  0001 C CNN
+F 3 "" H 6000 3600 50  0001 C CNN
+	1    6000 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF35
+P 6000 4200
+F 0 "SW?" H 5739 4119 50  0000 R CNN
+F 1 "Y" H 5739 4028 50  0000 R CNN
+F 2 "" H 6000 4200 50  0001 C CNN
+F 3 "" H 6000 4200 50  0001 C CNN
+	1    6000 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF3C
+P 6000 4800
+F 0 "SW?" H 5739 4719 50  0000 R CNN
+F 1 "H" H 5739 4628 50  0000 R CNN
+F 2 "" H 6000 4800 50  0001 C CNN
+F 3 "" H 6000 4800 50  0001 C CNN
+	1    6000 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BCF43
+P 6000 5400
+F 0 "SW?" H 5739 5319 50  0000 R CNN
+F 1 "N" H 5739 5228 50  0000 R CNN
+F 2 "" H 6000 5400 50  0001 C CNN
+F 3 "" H 6000 5400 50  0001 C CNN
+	1    6000 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB00
+P 6600 3600
+F 0 "SW?" H 6339 3519 50  0000 R CNN
+F 1 "7" H 6339 3428 50  0000 R CNN
+F 2 "" H 6600 3600 50  0001 C CNN
+F 3 "" H 6600 3600 50  0001 C CNN
+	1    6600 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB07
+P 6600 4200
+F 0 "SW?" H 6339 4119 50  0000 R CNN
+F 1 "U" H 6339 4028 50  0000 R CNN
+F 2 "" H 6600 4200 50  0001 C CNN
+F 3 "" H 6600 4200 50  0001 C CNN
+	1    6600 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB0E
+P 6600 4800
+F 0 "SW?" H 6339 4719 50  0000 R CNN
+F 1 "J" H 6339 4628 50  0000 R CNN
+F 2 "" H 6600 4800 50  0001 C CNN
+F 3 "" H 6600 4800 50  0001 C CNN
+	1    6600 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB15
+P 6600 5400
+F 0 "SW?" H 6339 5319 50  0000 R CNN
+F 1 "M" H 6339 5228 50  0000 R CNN
+F 2 "" H 6600 5400 50  0001 C CNN
+F 3 "" H 6600 5400 50  0001 C CNN
+	1    6600 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB1C
+P 7200 3600
+F 0 "SW?" H 6939 3519 50  0000 R CNN
+F 1 "8" H 6939 3428 50  0000 R CNN
+F 2 "" H 7200 3600 50  0001 C CNN
+F 3 "" H 7200 3600 50  0001 C CNN
+	1    7200 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB23
+P 7200 4200
+F 0 "SW?" H 6939 4119 50  0000 R CNN
+F 1 "I" H 6939 4028 50  0000 R CNN
+F 2 "" H 7200 4200 50  0001 C CNN
+F 3 "" H 7200 4200 50  0001 C CNN
+	1    7200 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB2A
+P 7200 4800
+F 0 "SW?" H 6939 4719 50  0000 R CNN
+F 1 "K" H 6939 4628 50  0000 R CNN
+F 2 "" H 7200 4800 50  0001 C CNN
+F 3 "" H 7200 4800 50  0001 C CNN
+	1    7200 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB31
+P 7200 5400
+F 0 "SW?" H 6939 5319 50  0000 R CNN
+F 1 "," H 6939 5228 50  0000 R CNN
+F 2 "" H 7200 5400 50  0001 C CNN
+F 3 "" H 7200 5400 50  0001 C CNN
+	1    7200 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB38
+P 7800 3600
+F 0 "SW?" H 7539 3519 50  0000 R CNN
+F 1 "9" H 7539 3428 50  0000 R CNN
+F 2 "" H 7800 3600 50  0001 C CNN
+F 3 "" H 7800 3600 50  0001 C CNN
+	1    7800 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB3F
+P 7800 4200
+F 0 "SW?" H 7539 4119 50  0000 R CNN
+F 1 "O" H 7539 4028 50  0000 R CNN
+F 2 "" H 7800 4200 50  0001 C CNN
+F 3 "" H 7800 4200 50  0001 C CNN
+	1    7800 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB46
+P 7800 4800
+F 0 "SW?" H 7539 4719 50  0000 R CNN
+F 1 "L" H 7539 4628 50  0000 R CNN
+F 2 "" H 7800 4800 50  0001 C CNN
+F 3 "" H 7800 4800 50  0001 C CNN
+	1    7800 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621BEB4D
+P 7800 5400
+F 0 "SW?" H 7539 5319 50  0000 R CNN
+F 1 "." H 7539 5228 50  0000 R CNN
+F 2 "" H 7800 5400 50  0001 C CNN
+F 3 "" H 7800 5400 50  0001 C CNN
+	1    7800 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C1069
+P 8400 3600
+F 0 "SW?" H 8139 3519 50  0000 R CNN
+F 1 "0" H 8139 3428 50  0000 R CNN
+F 2 "" H 8400 3600 50  0001 C CNN
+F 3 "" H 8400 3600 50  0001 C CNN
+	1    8400 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C1070
+P 8400 4200
+F 0 "SW?" H 8139 4119 50  0000 R CNN
+F 1 "P" H 8139 4028 50  0000 R CNN
+F 2 "" H 8400 4200 50  0001 C CNN
+F 3 "" H 8400 4200 50  0001 C CNN
+	1    8400 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C1077
+P 8400 4800
+F 0 "SW?" H 8139 4719 50  0000 R CNN
+F 1 ";" H 8139 4628 50  0000 R CNN
+F 2 "" H 8400 4800 50  0001 C CNN
+F 3 "" H 8400 4800 50  0001 C CNN
+	1    8400 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C107E
+P 8400 5400
+F 0 "SW?" H 8139 5319 50  0000 R CNN
+F 1 "/" H 8139 5228 50  0000 R CNN
+F 2 "" H 8400 5400 50  0001 C CNN
+F 3 "" H 8400 5400 50  0001 C CNN
+	1    8400 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C1085
+P 9000 3600
+F 0 "SW?" H 8739 3519 50  0000 R CNN
+F 1 "-" H 8739 3428 50  0000 R CNN
+F 2 "" H 9000 3600 50  0001 C CNN
+F 3 "" H 9000 3600 50  0001 C CNN
+	1    9000 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C108C
+P 9000 4200
+F 0 "SW?" H 8739 4119 50  0000 R CNN
+F 1 "Up" H 8739 4028 50  0000 R CNN
+F 2 "" H 9000 4200 50  0001 C CNN
+F 3 "" H 9000 4200 50  0001 C CNN
+	1    9000 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C1093
+P 9000 4800
+F 0 "SW?" H 8739 4719 50  0000 R CNN
+F 1 ":" H 8739 4628 50  0000 R CNN
+F 2 "" H 9000 4800 50  0001 C CNN
+F 3 "" H 9000 4800 50  0001 C CNN
+	1    9000 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C10A1
+P 9600 3600
+F 0 "SW?" H 9339 3519 50  0000 R CNN
+F 1 "Left" H 9339 3428 50  0000 R CNN
+F 2 "" H 9600 3600 50  0001 C CNN
+F 3 "" H 9600 3600 50  0001 C CNN
+	1    9600 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C10A8
+P 9600 4200
+F 0 "SW?" H 9340 4119 50  0000 R CNN
+F 1 "Down" H 9340 4028 50  0000 R CNN
+F 2 "" H 9600 4200 50  0001 C CNN
+F 3 "" H 9600 4200 50  0001 C CNN
+	1    9600 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C10AF
+P 9600 4800
+F 0 "SW?" H 9340 4719 50  0000 R CNN
+F 1 "Return" H 9340 4628 50  0000 R CNN
+F 2 "" H 9600 4800 50  0001 C CNN
+F 3 "" H 9600 4800 50  0001 C CNN
+	1    9600 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C10B6
+P 9600 5400
+F 0 "SW?" H 9340 5319 50  0000 R CNN
+F 1 "Delete" H 9340 5228 50  0000 R CNN
+F 2 "" H 9600 5400 50  0001 C CNN
+F 3 "" H 9600 5400 50  0001 C CNN
+	1    9600 5400
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C2072
+P 10200 3600
+F 0 "SW?" H 9940 3519 50  0000 R CNN
+F 1 "Right" H 9940 3428 50  0000 R CNN
+F 2 "" H 10200 3600 50  0001 C CNN
+F 3 "" H 10200 3600 50  0001 C CNN
+	1    10200 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C2079
+P 10200 4200
+F 0 "SW?" H 9940 4119 50  0000 R CNN
+F 1 "Copy" H 9940 4028 50  0000 R CNN
+F 2 "" H 10200 4200 50  0001 C CNN
+F 3 "" H 10200 4200 50  0001 C CNN
+	1    10200 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L AcornElectron:Keyswitch SW?
+U 1 1 621C2087
+P 10200 5400
+F 0 "SW?" H 9939 5319 50  0000 R CNN
+F 1 "Space" H 9939 5228 50  0000 R CNN
+F 2 "" H 10200 5400 50  0001 C CNN
+F 3 "" H 10200 5400 50  0001 C CNN
+	1    10200 5400
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3000 3100 3000 3850
+Connection ~ 3000 3850
+Wire Wire Line
+	3000 3850 3000 4450
+Connection ~ 3000 4450
+Wire Wire Line
+	3000 4450 3000 5050
+Connection ~ 3000 5050
+Wire Wire Line
+	3000 5050 3000 5650
+Wire Wire Line
+	3600 3100 3600 3850
+Connection ~ 3600 3850
+Wire Wire Line
+	3600 3850 3600 4450
+Connection ~ 3600 4450
+Wire Wire Line
+	3600 4450 3600 5050
+Connection ~ 3600 5050
+Wire Wire Line
+	3600 5050 3600 5650
+Wire Wire Line
+	4200 3100 4200 3850
+Connection ~ 4200 3850
+Wire Wire Line
+	4200 3850 4200 4450
+Connection ~ 4200 4450
+Wire Wire Line
+	4200 4450 4200 5050
+Connection ~ 4200 5050
+Wire Wire Line
+	4200 5050 4200 5650
+Wire Wire Line
+	4800 3100 4800 3850
+Connection ~ 4800 3850
+Wire Wire Line
+	4800 3850 4800 4450
+Connection ~ 4800 4450
+Wire Wire Line
+	4800 4450 4800 5050
+Connection ~ 4800 5050
+Wire Wire Line
+	4800 5050 4800 5650
+Wire Wire Line
+	5400 3100 5400 3850
+Connection ~ 5400 3850
+Wire Wire Line
+	5400 3850 5400 4450
+Connection ~ 5400 4450
+Wire Wire Line
+	5400 4450 5400 5050
+Connection ~ 5400 5050
+Wire Wire Line
+	5400 5050 5400 5650
+Wire Wire Line
+	6000 3100 6000 3850
+Connection ~ 6000 3850
+Wire Wire Line
+	6000 3850 6000 4450
+Connection ~ 6000 4450
+Wire Wire Line
+	6000 4450 6000 5050
+Connection ~ 6000 5050
+Wire Wire Line
+	6000 5050 6000 5650
+Wire Wire Line
+	6600 3100 6600 3850
+Connection ~ 6600 3850
+Wire Wire Line
+	6600 3850 6600 4450
+Connection ~ 6600 4450
+Wire Wire Line
+	6600 4450 6600 5050
+Connection ~ 6600 5050
+Wire Wire Line
+	6600 5050 6600 5650
+Wire Wire Line
+	7200 3100 7200 3850
+Connection ~ 7200 3850
+Wire Wire Line
+	7200 3850 7200 4450
+Connection ~ 7200 4450
+Wire Wire Line
+	7200 4450 7200 5050
+Connection ~ 7200 5050
+Wire Wire Line
+	7200 5050 7200 5650
+Wire Wire Line
+	7800 3100 7800 3850
+Connection ~ 7800 3850
+Wire Wire Line
+	7800 3850 7800 4450
+Connection ~ 7800 4450
+Wire Wire Line
+	7800 4450 7800 5050
+Connection ~ 7800 5050
+Wire Wire Line
+	7800 5050 7800 5650
+Wire Wire Line
+	8400 3100 8400 3850
+Connection ~ 8400 3850
+Wire Wire Line
+	8400 3850 8400 4450
+Connection ~ 8400 4450
+Wire Wire Line
+	8400 4450 8400 5050
+Connection ~ 8400 5050
+Wire Wire Line
+	8400 5050 8400 5650
+Wire Wire Line
+	9000 3100 9000 3850
+Connection ~ 9000 3850
+Wire Wire Line
+	9000 3850 9000 4450
+Connection ~ 9000 4450
+Wire Wire Line
+	9000 4450 9000 5050
+Wire Wire Line
+	9600 3100 9600 3850
+Connection ~ 9600 3850
+Wire Wire Line
+	9600 3850 9600 4450
+Connection ~ 9600 4450
+Wire Wire Line
+	9600 4450 9600 5050
+Connection ~ 9600 5050
+Wire Wire Line
+	9600 5050 9600 5650
+Wire Wire Line
+	10200 3100 10200 3850
+Connection ~ 10200 3850
+Wire Wire Line
+	10200 3850 10200 4450
+Connection ~ 10200 4450
+Wire Wire Line
+	1400 3600 2200 3600
+Connection ~ 2200 3600
+Wire Wire Line
+	2200 3600 2800 3600
+Connection ~ 2800 3600
+Wire Wire Line
+	2800 3600 3400 3600
+Connection ~ 3400 3600
+Wire Wire Line
+	3400 3600 4000 3600
+Connection ~ 4000 3600
+Wire Wire Line
+	4000 3600 4600 3600
+Connection ~ 4600 3600
+Wire Wire Line
+	4600 3600 5200 3600
+Connection ~ 5200 3600
+Wire Wire Line
+	5200 3600 5800 3600
+Connection ~ 5800 3600
+Wire Wire Line
+	5800 3600 6400 3600
+Connection ~ 6400 3600
+Wire Wire Line
+	6400 3600 7000 3600
+Connection ~ 7000 3600
+Wire Wire Line
+	7000 3600 7600 3600
+Connection ~ 7600 3600
+Wire Wire Line
+	7600 3600 8200 3600
+Connection ~ 8200 3600
+Wire Wire Line
+	8200 3600 8800 3600
+Connection ~ 8800 3600
+Wire Wire Line
+	8800 3600 9400 3600
+Connection ~ 9400 3600
+Wire Wire Line
+	9400 3600 10000 3600
+Wire Wire Line
+	1500 4200 2200 4200
+Connection ~ 2200 4200
+Wire Wire Line
+	2200 4200 2800 4200
+Connection ~ 2800 4200
+Wire Wire Line
+	2800 4200 3400 4200
+Connection ~ 3400 4200
+Wire Wire Line
+	3400 4200 4000 4200
+Connection ~ 4000 4200
+Wire Wire Line
+	4000 4200 4600 4200
+Connection ~ 4600 4200
+Wire Wire Line
+	4600 4200 5200 4200
+Connection ~ 5200 4200
+Wire Wire Line
+	5200 4200 5800 4200
+Connection ~ 5800 4200
+Wire Wire Line
+	5800 4200 6400 4200
+Connection ~ 6400 4200
+Wire Wire Line
+	6400 4200 7000 4200
+Connection ~ 7000 4200
+Wire Wire Line
+	7000 4200 7600 4200
+Connection ~ 7600 4200
+Wire Wire Line
+	7600 4200 8200 4200
+Connection ~ 8200 4200
+Wire Wire Line
+	8200 4200 8800 4200
+Connection ~ 8800 4200
+Wire Wire Line
+	8800 4200 9400 4200
+Connection ~ 9400 4200
+Wire Wire Line
+	9400 4200 10000 4200
+Wire Wire Line
+	1600 4800 2200 4800
+Connection ~ 2200 4800
+Wire Wire Line
+	2200 4800 2800 4800
+Connection ~ 2800 4800
+Wire Wire Line
+	2800 4800 3400 4800
+Connection ~ 3400 4800
+Wire Wire Line
+	3400 4800 4000 4800
+Connection ~ 4000 4800
+Wire Wire Line
+	4000 4800 4600 4800
+Connection ~ 4600 4800
+Wire Wire Line
+	4600 4800 5200 4800
+Connection ~ 5200 4800
+Wire Wire Line
+	5200 4800 5800 4800
+Connection ~ 5800 4800
+Wire Wire Line
+	5800 4800 6400 4800
+Connection ~ 6400 4800
+Wire Wire Line
+	6400 4800 7000 4800
+Connection ~ 7000 4800
+Wire Wire Line
+	7000 4800 7600 4800
+Connection ~ 7600 4800
+Wire Wire Line
+	7600 4800 8200 4800
+Connection ~ 8200 4800
+Wire Wire Line
+	8200 4800 8800 4800
+Connection ~ 8800 4800
+Wire Wire Line
+	8800 4800 9400 4800
+Wire Wire Line
+	1700 5400 2200 5400
+Connection ~ 2200 5400
+Wire Wire Line
+	2200 5400 2800 5400
+Connection ~ 2800 5400
+Wire Wire Line
+	2800 5400 3400 5400
+Connection ~ 3400 5400
+Wire Wire Line
+	3400 5400 4000 5400
+Connection ~ 4000 5400
+Wire Wire Line
+	4000 5400 4600 5400
+Connection ~ 4600 5400
+Wire Wire Line
+	4600 5400 5200 5400
+Connection ~ 5200 5400
+Wire Wire Line
+	5200 5400 5800 5400
+Connection ~ 5800 5400
+Wire Wire Line
+	5800 5400 6400 5400
+Connection ~ 6400 5400
+Wire Wire Line
+	6400 5400 7000 5400
+Connection ~ 7000 5400
+Wire Wire Line
+	7000 5400 7600 5400
+Connection ~ 7600 5400
+Wire Wire Line
+	7600 5400 8200 5400
+Connection ~ 8200 5400
+Connection ~ 9400 5400
+Wire Wire Line
+	9400 5400 10000 5400
+Wire Wire Line
+	8200 5400 9400 5400
+Wire Wire Line
+	10200 4450 10200 5650
+Text GLabel 1300 1500 3    50   Output ~ 0
+5V
+Text GLabel 1200 1700 3    50   Output ~ 0
+0V
+Text GLabel 11000 3000 2    50   Input ~ 0
+5V
+$Comp
+L Device:R R?
+U 1 1 622063E0
+P 10700 3350
+F 0 "R?" H 10650 3400 50  0000 R CNN
+F 1 "15000R" H 10650 3300 50  0000 R CNN
+F 2 "" V 10630 3350 50  0001 C CNN
+F 3 "~" H 10700 3350 50  0001 C CNN
+	1    10700 3350
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	10000 3600 10700 3600
+Wire Wire Line
+	10700 3600 10700 3500
+Connection ~ 10000 3600
+Wire Wire Line
+	10000 4200 10700 4200
+Wire Wire Line
+	10700 4200 10700 4100
+Connection ~ 10000 4200
+Wire Wire Line
+	9400 4800 10700 4800
+Wire Wire Line
+	10700 4800 10700 4700
+Connection ~ 9400 4800
+Wire Wire Line
+	10000 5400 10700 5400
+Wire Wire Line
+	10700 5400 10700 5300
+Connection ~ 10000 5400
+Wire Wire Line
+	10700 3200 10700 3000
+Wire Wire Line
+	10700 3000 10900 3000
+Wire Wire Line
+	10700 3800 10900 3800
+Wire Wire Line
+	10900 3800 10900 3000
+Connection ~ 10900 3000
+Wire Wire Line
+	10900 3000 11000 3000
+Wire Wire Line
+	10700 4400 10900 4400
+Wire Wire Line
+	10900 4400 10900 3800
+Connection ~ 10900 3800
+Wire Wire Line
+	10700 5000 10900 5000
+Wire Wire Line
+	10900 5000 10900 4400
+Connection ~ 10900 4400
+Text GLabel 700  2400 0    50   Input ~ 0
+0V
+$Comp
+L Switch:SW_Push SW?
+U 1 1 62237B45
+P 1000 2100
+F 0 "SW?" V 1050 2250 50  0000 L CNN
+F 1 "Break" V 950 2250 50  0000 L CNN
+F 2 "" H 1000 2300 50  0001 C CNN
+F 3 "" H 1000 2300 50  0001 C CNN
+	1    1000 2100
+	0    -1   -1   0   
+$EndComp
+Wire Wire Line
+	700  2400 1000 2400
+Wire Wire Line
+	1000 2400 1000 2300
+Text GLabel 1700 6300 2    50   Input ~ 0
+5V
+Text GLabel 1700 6800 2    50   Input ~ 0
+0V
+$Comp
+L Device:C C?
+U 1 1 62247582
+P 1500 6550
+F 0 "C?" H 1615 6596 50  0000 L CNN
+F 1 "0.47µF" H 1615 6505 50  0000 L CNN
+F 2 "" H 1538 6400 50  0001 C CNN
+F 3 "~" H 1500 6550 50  0001 C CNN
+	1    1500 6550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1500 6700 1500 6800
+Wire Wire Line
+	1500 6800 1700 6800
+Wire Wire Line
+	1500 6400 1500 6300
+Wire Wire Line
+	1500 6300 1700 6300
+$Comp
+L Device:R R?
+U 1 1 622563BF
+P 1100 6050
+F 0 "R?" H 1170 6096 50  0000 L CNN
+F 1 "470R" H 1170 6005 50  0000 L CNN
+F 2 "" V 1030 6050 50  0001 C CNN
+F 3 "~" H 1100 6050 50  0001 C CNN
+	1    1100 6050
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:LED D?
+U 1 1 6225652E
+P 1100 5550
+F 0 "D?" V 1045 5628 50  0000 L CNN
+F 1 "LED" V 1136 5628 50  0000 L CNN
+F 2 "" H 1100 5550 50  0001 C CNN
+F 3 "~" H 1100 5550 50  0001 C CNN
+	1    1100 5550
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	1500 6300 1100 6300
+Wire Wire Line
+	1100 6300 1100 6200
+Connection ~ 1500 6300
+Wire Wire Line
+	1100 5900 1100 5700
+$Comp
+L Device:R R?
+U 1 1 62271B97
+P 10700 3950
+F 0 "R?" H 10650 4000 50  0000 R CNN
+F 1 "15000R" H 10650 3900 50  0000 R CNN
+F 2 "" V 10630 3950 50  0001 C CNN
+F 3 "~" H 10700 3950 50  0001 C CNN
+	1    10700 3950
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R?
+U 1 1 62271C51
+P 10700 4550
+F 0 "R?" H 10650 4600 50  0000 R CNN
+F 1 "15000R" H 10650 4500 50  0000 R CNN
+F 2 "" V 10630 4550 50  0001 C CNN
+F 3 "~" H 10700 4550 50  0001 C CNN
+	1    10700 4550
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R?
+U 1 1 62271CFE
+P 10700 5150
+F 0 "R?" H 10650 5200 50  0000 R CNN
+F 1 "15000R" H 10650 5100 50  0000 R CNN
+F 2 "" V 10630 5150 50  0001 C CNN
+F 3 "~" H 10700 5150 50  0001 C CNN
+	1    10700 5150
+	1    0    0    -1  
+$EndComp
+$EndSCHEMATC
diff -r aa42a38b72f0 -r aec8f8ba49a9 RAM.sch
--- a/RAM.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/RAM.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 3 9
+Sheet 3 10
 Title ""
 Date ""
 Rev ""
@@ -525,6 +525,7 @@
 	2900 2400 2900 1900
 Wire Wire Line
 	2900 1900 4300 1900
+Connection ~ 4300 1900
 Wire Wire Line
 	1900 3100 3300 3100
 Wire Wire Line
@@ -549,5 +550,4 @@
 	3000 2700 3000 3300
 Wire Bus Line
 	1600 1600 7700 1600
-Connection ~ 4300 1900
 $EndSCHEMATC
diff -r aa42a38b72f0 -r aec8f8ba49a9 UHF.sch
--- a/UHF.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/UHF.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 9 9
+Sheet 9 10
 Title ""
 Date ""
 Rev ""
diff -r aa42a38b72f0 -r aec8f8ba49a9 cassette.sch
--- a/cassette.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/cassette.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 4 9
+Sheet 4 10
 Title ""
 Date ""
 Rev ""
diff -r aa42a38b72f0 -r aec8f8ba49a9 clocks.sch
--- a/clocks.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/clocks.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 2 9
+Sheet 2 10
 Title ""
 Date ""
 Rev ""
diff -r aa42a38b72f0 -r aec8f8ba49a9 expansion.sch
--- a/expansion.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/expansion.sch	Sat Feb 26 17:03:44 2022 +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 aa42a38b72f0 -r aec8f8ba49a9 sound.sch
--- a/sound.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/sound.sch	Sat Feb 26 17:03:44 2022 +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 aa42a38b72f0 -r aec8f8ba49a9 video.sch
--- a/video.sch	Thu Feb 24 18:52:07 2022 +0100
+++ b/video.sch	Sat Feb 26 17:03:44 2022 +0100
@@ -4,7 +4,7 @@
 EELAYER END
 $Descr A4 11693 8268
 encoding utf-8
-Sheet 8 9
+Sheet 8 10
 Title ""
 Date ""
 Rev ""