1.1 --- a/AcornElectronMainboard.sch Mon Jan 23 00:37:25 2023 +0100
1.2 +++ b/AcornElectronMainboard.sch Tue Jan 24 21:56:51 2023 +0100
1.3 @@ -4,7 +4,7 @@
1.4 EELAYER END
1.5 $Descr A4 8268 11693 portrait
1.6 encoding utf-8
1.7 -Sheet 1 9
1.8 +Sheet 1 10
1.9 Title "Acorn Electron Mainboard"
1.10 Date ""
1.11 Rev ""
1.12 @@ -239,29 +239,6 @@
1.13 2200 3400 2900 3400
1.14 Wire Wire Line
1.15 2200 3500 2900 3500
1.16 -$Comp
1.17 -L Connector_Generic:Conn_01x03 PL3
1.18 -U 1 1 61CF9DF4
1.19 -P 1400 8900
1.20 -F 0 "PL3" H 1320 9217 50 0000 C CNN
1.21 -F 1 "Power" H 1320 9126 50 0000 C CNN
1.22 -F 2 "" H 1400 8900 50 0001 C CNN
1.23 -F 3 "~" H 1400 8900 50 0001 C CNN
1.24 - 1 1400 8900
1.25 - -1 0 0 -1
1.26 -$EndComp
1.27 -Text GLabel 3700 8800 2 50 Output ~ 0
1.28 -5V
1.29 -Wire Wire Line
1.30 - 1600 8800 2100 8800
1.31 -Text GLabel 3700 9300 2 50 Output ~ 0
1.32 -0V
1.33 -Text GLabel 3700 9800 2 50 Output ~ 0
1.34 --5V
1.35 -Wire Wire Line
1.36 - 1900 9300 2000 9300
1.37 -Wire Wire Line
1.38 - 1800 9800 2000 9800
1.39 Text GLabel 3800 7100 3 50 Input ~ 0
1.40 0V
1.41 Wire Wire Line
1.42 @@ -332,121 +309,14 @@
1.43 3250 1500 3350 1500
1.44 Wire Wire Line
1.45 3350 1500 3350 1400
1.46 -$Comp
1.47 -L Device:C Ax19
1.48 -U 1 1 621AFB3A
1.49 -P 2700 9050
1.50 -F 0 "Ax19" H 2815 9096 50 0000 L CNN
1.51 -F 1 "47nF" H 2815 9005 50 0000 L CNN
1.52 -F 2 "" H 2738 8900 50 0001 C CNN
1.53 -F 3 "~" H 2700 9050 50 0001 C CNN
1.54 - 1 2700 9050
1.55 - 1 0 0 -1
1.56 -$EndComp
1.57 -$Comp
1.58 -L Device:C Ax1
1.59 -U 1 1 62245E33
1.60 -P 2600 9550
1.61 -F 0 "Ax1" H 2715 9596 50 0000 L CNN
1.62 -F 1 "47nF" H 2715 9505 50 0000 L CNN
1.63 -F 2 "" H 2638 9400 50 0001 C CNN
1.64 -F 3 "~" H 2600 9550 50 0001 C CNN
1.65 - 1 2600 9550
1.66 - 1 0 0 -1
1.67 -$EndComp
1.68 -$Comp
1.69 -L Device:CP C1
1.70 -U 1 1 62245FAE
1.71 -P 2100 9050
1.72 -F 0 "C1" H 2218 9096 50 0000 L CNN
1.73 -F 1 "47µF/16V" H 2218 9005 38 0000 L CNN
1.74 -F 2 "" H 2138 8900 50 0001 C CNN
1.75 -F 3 "~" H 2100 9050 50 0001 C CNN
1.76 - 1 2100 9050
1.77 - 1 0 0 -1
1.78 -$EndComp
1.79 -$Comp
1.80 -L Device:CP C2
1.81 -U 1 1 62245FF4
1.82 -P 2000 9550
1.83 -F 0 "C2" H 2118 9596 50 0000 L CNN
1.84 -F 1 "10µF/16V" H 2118 9505 38 0000 L CNN
1.85 -F 2 "" H 2038 9400 50 0001 C CNN
1.86 -F 3 "~" H 2000 9550 50 0001 C CNN
1.87 - 1 2000 9550
1.88 - 1 0 0 -1
1.89 -$EndComp
1.90 -Wire Wire Line
1.91 - 1900 9300 1900 8900
1.92 -Wire Wire Line
1.93 - 1900 8900 1600 8900
1.94 -Wire Wire Line
1.95 - 1800 9800 1800 9000
1.96 -Wire Wire Line
1.97 - 2100 8900 2100 8800
1.98 -Connection ~ 2100 8800
1.99 -Wire Wire Line
1.100 - 2100 8800 2700 8800
1.101 -Wire Wire Line
1.102 - 2000 9400 2000 9300
1.103 -Connection ~ 2000 9300
1.104 -Wire Wire Line
1.105 - 2000 9300 2100 9300
1.106 -Wire Wire Line
1.107 - 2100 9200 2100 9300
1.108 -Connection ~ 2100 9300
1.109 -Wire Wire Line
1.110 - 2100 9300 2600 9300
1.111 -Wire Wire Line
1.112 - 2000 9700 2000 9800
1.113 -Connection ~ 2000 9800
1.114 -Wire Wire Line
1.115 - 2000 9800 2600 9800
1.116 -Wire Wire Line
1.117 - 2600 9800 2600 9700
1.118 -Connection ~ 2600 9800
1.119 -Wire Wire Line
1.120 - 2600 9400 2600 9300
1.121 -Connection ~ 2600 9300
1.122 -Wire Wire Line
1.123 - 2600 9300 2700 9300
1.124 -Wire Wire Line
1.125 - 2700 9300 2700 9200
1.126 -Connection ~ 2700 9300
1.127 -Wire Wire Line
1.128 - 2700 8900 2700 8800
1.129 -Connection ~ 2700 8800
1.130 -$Comp
1.131 -L Connector_Generic:Conn_01x02 PL4
1.132 -U 1 1 627DA4FF
1.133 -P 1400 10100
1.134 -F 0 "PL4" H 1320 10317 50 0000 C CNN
1.135 -F 1 "Power" H 1320 10226 50 0000 C CNN
1.136 -F 2 "" H 1400 10100 50 0001 C CNN
1.137 -F 3 "~" H 1400 10100 50 0001 C CNN
1.138 - 1 1400 10100
1.139 - -1 0 0 -1
1.140 -$EndComp
1.141 Wire Wire Line
1.142 3600 6750 3600 7400
1.143 Wire Wire Line
1.144 3600 7400 3500 7400
1.145 -Text Label 1600 8800 0 50 ~ 0
1.146 -5V
1.147 -Text Label 1600 8900 0 50 ~ 0
1.148 -0V
1.149 -Wire Wire Line
1.150 - 1600 9000 1800 9000
1.151 -Text Label 1600 9000 0 50 ~ 0
1.152 --5V
1.153 -Text Label 1600 10100 0 50 ~ 0
1.154 -RETURN
1.155 -Text Label 1600 10200 0 50 ~ 0
1.156 -18VAC
1.157 Wire Wire Line
1.158 4600 7600 4600 6750
1.159 $Sheet
1.160 -S 2800 7800 700 300
1.161 +S 2800 8300 700 300
1.162 U 61DF4BC2
1.163 F0 "Clocks" 50
1.164 F1 "clocks.sch" 50
1.165 @@ -456,7 +326,7 @@
1.166 Text GLabel 3500 7400 0 50 Input ~ 0
1.167 CLOCK_16MHz_DIV_13
1.168 $Sheet
1.169 -S 1200 1100 700 300
1.170 +S 1200 900 700 300
1.171 U 61D7EEE8
1.172 F0 "RAM" 50
1.173 F1 "RAM.sch" 50
1.174 @@ -468,7 +338,7 @@
1.175 Text GLabel 1700 2300 0 50 Output ~ 0
1.176 RA[0..7]
1.177 $Sheet
1.178 -S 5800 1300 700 300
1.179 +S 6700 900 700 300
1.180 U 624B50A6
1.181 F0 "Cassette" 50
1.182 F1 "cassette.sch" 50
1.183 @@ -482,7 +352,7 @@
1.184 Wire Wire Line
1.185 5600 1800 5800 1800
1.186 $Sheet
1.187 -S 5800 4200 700 300
1.188 +S 6700 4200 700 300
1.189 U 61E9B87F
1.190 F0 "Sound" 50
1.191 F1 "sound.sch" 50
1.192 @@ -491,20 +361,12 @@
1.193 SOUND_OUTPUT
1.194 Wire Wire Line
1.195 5600 4700 5800 4700
1.196 -Text GLabel 2600 10100 2 50 UnSpc ~ 0
1.197 -POWER_AC_RETURN
1.198 -Text GLabel 2600 10200 2 50 UnSpc ~ 0
1.199 -POWER_18VAC
1.200 -Wire Wire Line
1.201 - 1600 10100 2100 10100
1.202 -Wire Wire Line
1.203 - 1600 10200 2100 10200
1.204 Wire Wire Line
1.205 3500 7600 4600 7600
1.206 Text GLabel 1700 6400 0 50 Output ~ 0
1.207 PHI_OUT
1.208 $Sheet
1.209 -S 1300 7800 700 300
1.210 +S 2800 8900 700 300
1.211 U 61FB7D7E
1.212 F0 "Expansion" 50
1.213 F1 "expansion.sch" 50
1.214 @@ -524,7 +386,7 @@
1.215 Text GLabel 2700 3700 0 50 Input ~ 0
1.216 ~RST
1.217 $Sheet
1.218 -S 1300 6800 700 300
1.219 +S 1300 8300 700 300
1.220 U 61F2273C
1.221 F0 "CPU, ROM, keyboard" 50
1.222 F1 "CPU_ROM_KBD.sch" 50
1.223 @@ -586,7 +448,7 @@
1.224 Wire Wire Line
1.225 1700 6400 2900 6400
1.226 $Sheet
1.227 -S 4800 7800 700 300
1.228 +S 4300 8900 700 300
1.229 U 61DB955D
1.230 F0 "Video" 50
1.231 F1 "video.sch" 50
1.232 @@ -657,7 +519,7 @@
1.233 Wire Wire Line
1.234 5600 2600 5800 2600
1.235 $Sheet
1.236 -S 4800 7200 700 300
1.237 +S 4300 8300 700 300
1.238 U 62411C42
1.239 F0 "UHF" 50
1.240 F1 "UHF.sch" 50
1.241 @@ -666,7 +528,7 @@
1.242 5600 6300 5800 6300
1.243 Wire Wire Line
1.244 5600 5900 6000 5900
1.245 -Text Notes 5800 9150 0 50 ~ 0
1.246 +Text Notes 6100 9100 0 50 ~ 0
1.247 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.
1.248 $Comp
1.249 L 74xx:74LS08 IC19
1.250 @@ -712,17 +574,6 @@
1.251 4 6700 6700
1.252 1 0 0 -1
1.253 $EndComp
1.254 -$Comp
1.255 -L 74xx:74LS08 IC19
1.256 -U 5 1 61E3E5E4
1.257 -P 7200 8900
1.258 -F 0 "IC19" H 7430 8946 50 0000 L CNN
1.259 -F 1 "74LS08" H 7430 8855 50 0000 L CNN
1.260 -F 2 "" H 7200 8900 50 0001 C CNN
1.261 -F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 8900 50 0001 C CNN
1.262 - 5 7200 8900
1.263 - 1 0 0 -1
1.264 -$EndComp
1.265 Wire Wire Line
1.266 5800 6300 5800 7800
1.267 Wire Wire Line
1.268 @@ -785,21 +636,11 @@
1.269 5V
1.270 Wire Wire Line
1.271 6900 8400 6800 8400
1.272 -Text GLabel 7200 8300 1 50 Input ~ 0
1.273 -5V
1.274 -Wire Wire Line
1.275 - 7200 8300 7200 8400
1.276 -Text GLabel 7200 9500 3 50 Input ~ 0
1.277 -0V
1.278 -Wire Wire Line
1.279 - 7200 9500 7200 9400
1.280 Text GLabel 6100 8400 0 50 Output ~ 0
1.281 BUFFER_ENABLE
1.282 Wire Wire Line
1.283 6100 8400 6200 8400
1.284 Connection ~ 6200 8400
1.285 -Text Notes 1400 10600 0 50 ~ 0
1.286 -PL4 introduced for the two separate connections\non the original board.
1.287 Text Label 2100 5400 2 50 ~ 0
1.288 D[0..7]
1.289 Text Label 2100 3800 2 50 ~ 0
1.290 @@ -824,135 +665,11 @@
1.291 KBD2
1.292 Text Label 2900 3500 2 50 ~ 0
1.293 KBD3
1.294 -$Comp
1.295 -L power:PWR_FLAG #FLG0104
1.296 -U 1 1 62281B8F
1.297 -P 2100 10100
1.298 -F 0 "#FLG0104" H 2100 10175 50 0001 C CNN
1.299 -F 1 "PWR_FLAG" H 2100 10274 50 0000 C CNN
1.300 -F 2 "" H 2100 10100 50 0001 C CNN
1.301 -F 3 "~" H 2100 10100 50 0001 C CNN
1.302 - 1 2100 10100
1.303 - 1 0 0 -1
1.304 -$EndComp
1.305 -Connection ~ 2100 10100
1.306 -Wire Wire Line
1.307 - 2100 10100 2600 10100
1.308 -$Comp
1.309 -L power:PWR_FLAG #FLG0105
1.310 -U 1 1 62281BE9
1.311 -P 2100 10200
1.312 -F 0 "#FLG0105" H 2100 10275 50 0001 C CNN
1.313 -F 1 "PWR_FLAG" H 2100 10373 50 0000 C CNN
1.314 -F 2 "" H 2100 10200 50 0001 C CNN
1.315 -F 3 "~" H 2100 10200 50 0001 C CNN
1.316 - 1 2100 10200
1.317 - -1 0 0 1
1.318 -$EndComp
1.319 -Connection ~ 2100 10200
1.320 -Wire Wire Line
1.321 - 2100 10200 2600 10200
1.322 Wire Wire Line
1.323 4000 900 4000 800
1.324 Wire Wire Line
1.325 4000 1550 4000 1250
1.326 $Comp
1.327 -L power:+5V #PWR0101
1.328 -U 1 1 61F9A343
1.329 -P 3500 8600
1.330 -F 0 "#PWR0101" H 3500 8450 50 0001 C CNN
1.331 -F 1 "+5V" H 3515 8773 50 0000 C CNN
1.332 -F 2 "" H 3500 8600 50 0001 C CNN
1.333 -F 3 "" H 3500 8600 50 0001 C CNN
1.334 - 1 3500 8600
1.335 - 1 0 0 -1
1.336 -$EndComp
1.337 -$Comp
1.338 -L power:GND #PWR0102
1.339 -U 1 1 61FAE014
1.340 -P 3300 9500
1.341 -F 0 "#PWR0102" H 3300 9250 50 0001 C CNN
1.342 -F 1 "GND" H 3305 9327 50 0000 C CNN
1.343 -F 2 "" H 3300 9500 50 0001 C CNN
1.344 -F 3 "" H 3300 9500 50 0001 C CNN
1.345 - 1 3300 9500
1.346 - 1 0 0 -1
1.347 -$EndComp
1.348 -$Comp
1.349 -L power:-5V #PWR0103
1.350 -U 1 1 61FAE0AD
1.351 -P 3500 9600
1.352 -F 0 "#PWR0103" H 3500 9700 50 0001 C CNN
1.353 -F 1 "-5V" H 3515 9773 50 0000 C CNN
1.354 -F 2 "" H 3500 9600 50 0001 C CNN
1.355 -F 3 "" H 3500 9600 50 0001 C CNN
1.356 - 1 3500 9600
1.357 - 1 0 0 -1
1.358 -$EndComp
1.359 -Wire Wire Line
1.360 - 2700 8800 3500 8800
1.361 -Wire Wire Line
1.362 - 2600 9800 3500 9800
1.363 -Wire Wire Line
1.364 - 2700 9300 3300 9300
1.365 -Connection ~ 3500 8800
1.366 -Wire Wire Line
1.367 - 3500 8800 3700 8800
1.368 -Wire Wire Line
1.369 - 3300 9500 3300 9400
1.370 -Connection ~ 3300 9300
1.371 -Wire Wire Line
1.372 - 3300 9300 3700 9300
1.373 -Wire Wire Line
1.374 - 3500 9800 3500 9700
1.375 -Connection ~ 3500 9800
1.376 -Wire Wire Line
1.377 - 3500 9800 3700 9800
1.378 -$Comp
1.379 -L power:PWR_FLAG #FLG0101
1.380 -U 1 1 61FD1C8B
1.381 -P 3500 8700
1.382 -F 0 "#FLG0101" H 3500 8775 50 0001 C CNN
1.383 -F 1 "PWR_FLAG" V 3500 8828 50 0000 L CNN
1.384 -F 2 "" H 3500 8700 50 0001 C CNN
1.385 -F 3 "~" H 3500 8700 50 0001 C CNN
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1.387 - 0 -1 -1 0
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1.391 -U 1 1 61FD1D09
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1.393 -F 0 "#FLG0102" H 3500 9775 50 0001 C CNN
1.394 -F 1 "PWR_FLAG" V 3500 9828 50 0000 L CNN
1.395 -F 2 "" H 3500 9700 50 0001 C CNN
1.396 -F 3 "~" H 3500 9700 50 0001 C CNN
1.397 - 1 3500 9700
1.398 - 0 1 1 0
1.399 -$EndComp
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1.402 -U 1 1 61FD8A1C
1.403 -P 3300 9400
1.404 -F 0 "#FLG0103" H 3300 9475 50 0001 C CNN
1.405 -F 1 "PWR_FLAG" V 3300 9528 50 0000 L CNN
1.406 -F 2 "" H 3300 9400 50 0001 C CNN
1.407 -F 3 "~" H 3300 9400 50 0001 C CNN
1.408 - 1 3300 9400
1.409 - 0 -1 -1 0
1.410 -$EndComp
1.411 -Connection ~ 3300 9400
1.412 -Wire Wire Line
1.413 - 3300 9400 3300 9300
1.414 -Wire Wire Line
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1.416 -Connection ~ 3500 8700
1.417 -Wire Wire Line
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1.419 -Connection ~ 3500 9700
1.420 -Wire Wire Line
1.421 - 3500 9600 3500 9700
1.422 -$Comp
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1.424 U 1 1 62024979
1.425 P 4000 1250
1.426 @@ -984,6 +701,12 @@
1.427 Note that KiCad gets upset\nwhen connecting passives\nto power input pins.
1.428 Wire Bus Line
1.429 1700 1600 2100 1600
1.430 +$Sheet
1.431 +S 1300 8900 700 300
1.432 +U 6460C88B
1.433 +F0 "Power" 50
1.434 +F1 "power.sch" 50
1.435 +$EndSheet
1.436 Wire Bus Line
1.437 2100 1600 2100 1900
1.438 Wire Bus Line