1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/CPU_ROM_KBD.sch Wed Jan 26 22:13:42 2022 +0100
1.3 @@ -0,0 +1,761 @@
1.4 +EESchema Schematic File Version 4
1.5 +LIBS:AcornElectronMainboard-cache
1.6 +EELAYER 26 0
1.7 +EELAYER END
1.8 +$Descr A4 11693 8268
1.9 +encoding utf-8
1.10 +Sheet 7 9
1.11 +Title ""
1.12 +Date ""
1.13 +Rev ""
1.14 +Comp ""
1.15 +Comment1 ""
1.16 +Comment2 ""
1.17 +Comment3 ""
1.18 +Comment4 ""
1.19 +$EndDescr
1.20 +$Comp
1.21 +L AcornElectron:6502A IC?
1.22 +U 1 1 61F22EDC
1.23 +P 5400 4050
1.24 +AR Path="/61F22EDC" Ref="IC?" Part="1"
1.25 +AR Path="/61F2273C/61F22EDC" Ref="IC3" Part="1"
1.26 +F 0 "IC3" H 5400 5528 50 0000 C CNN
1.27 +F 1 "6502A" H 5400 5437 50 0000 C CNN
1.28 +F 2 "" H 5400 4050 50 0001 C CNN
1.29 +F 3 "" H 5400 4050 50 0001 C CNN
1.30 + 1 5400 4050
1.31 + 1 0 0 -1
1.32 +$EndComp
1.33 +Wire Wire Line
1.34 + 5900 4300 6000 4300
1.35 +NoConn ~ 5900 4500
1.36 +NoConn ~ 5900 4600
1.37 +Wire Wire Line
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1.39 +Text Label 4900 3100 2 50 ~ 0
1.40 +A0
1.41 +Text Label 4900 3200 2 50 ~ 0
1.42 +A1
1.43 +Text Label 4900 3300 2 50 ~ 0
1.44 +A2
1.45 +Text Label 4900 3400 2 50 ~ 0
1.46 +A3
1.47 +Text Label 4900 3500 2 50 ~ 0
1.48 +A4
1.49 +Text Label 4900 3600 2 50 ~ 0
1.50 +A5
1.51 +Text Label 4900 3700 2 50 ~ 0
1.52 +A6
1.53 +Text Label 4900 3800 2 50 ~ 0
1.54 +A7
1.55 +Text Label 4900 3900 2 50 ~ 0
1.56 +A8
1.57 +Text Label 4900 4000 2 50 ~ 0
1.58 +A9
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1.60 +A10
1.61 +Text Label 4900 4200 2 50 ~ 0
1.62 +A11
1.63 +Text Label 4900 4300 2 50 ~ 0
1.64 +A12
1.65 +Text Label 4900 4400 2 50 ~ 0
1.66 +A13
1.67 +Text Label 4900 4500 2 50 ~ 0
1.68 +A14
1.69 +Text Label 4900 4600 2 50 ~ 0
1.70 +A15
1.71 +Wire Bus Line
1.72 + 4400 1500 6800 1500
1.73 +Entry Wire Line
1.74 + 4400 3000 4500 3100
1.75 +Entry Wire Line
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1.77 +Entry Wire Line
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1.79 +Entry Wire Line
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1.81 +Entry Wire Line
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1.83 +Entry Wire Line
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1.85 +Entry Wire Line
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1.87 +Entry Wire Line
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1.89 +Entry Wire Line
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1.91 +Entry Wire Line
1.92 + 4400 3900 4500 4000
1.93 +Entry Wire Line
1.94 + 4400 4000 4500 4100
1.95 +Entry Wire Line
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1.97 +Entry Wire Line
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1.99 +Entry Wire Line
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1.101 +Entry Wire Line
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1.103 +Entry Wire Line
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1.105 +Wire Wire Line
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1.107 +Wire Wire Line
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1.109 +Wire Wire Line
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1.111 +Wire Wire Line
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1.113 +Wire Wire Line
1.114 + 4500 3500 4900 3500
1.115 +Wire Wire Line
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1.117 +Wire Wire Line
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1.119 +Wire Wire Line
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1.121 +Wire Wire Line
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1.123 +Wire Wire Line
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1.125 +Wire Wire Line
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1.127 +Wire Wire Line
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1.129 +Wire Wire Line
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1.131 +Wire Wire Line
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1.133 +Wire Wire Line
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1.135 +Wire Wire Line
1.136 + 4500 4600 4900 4600
1.137 +$Comp
1.138 +L Connector_Generic:Conn_01x22 PL?
1.139 +U 1 1 61F22F1C
1.140 +P 1100 3200
1.141 +AR Path="/61F22F1C" Ref="PL?" Part="1"
1.142 +AR Path="/61F2273C/61F22F1C" Ref="PL2" Part="1"
1.143 +F 0 "PL2" H 1020 4417 50 0000 C CNN
1.144 +F 1 "Keyboard" H 1020 4326 50 0000 C CNN
1.145 +F 2 "" H 1100 3200 50 0001 C CNN
1.146 +F 3 "~" H 1100 3200 50 0001 C CNN
1.147 + 1 1100 3200
1.148 + -1 0 0 -1
1.149 +$EndComp
1.150 +$Comp
1.151 +L ROM:ROM_32K IC?
1.152 +U 1 1 61F22F23
1.153 +P 3300 3700
1.154 +AR Path="/61F22F23" Ref="IC?" Part="1"
1.155 +AR Path="/61F2273C/61F22F23" Ref="IC2" Part="1"
1.156 +F 0 "IC2" H 3300 4600 50 0000 C CNN
1.157 +F 1 "ROM_32K" H 3300 4500 50 0000 C CNN
1.158 +F 2 "" H 3300 3700 50 0001 C CNN
1.159 +F 3 "" H 3300 3700 50 0001 C CNN
1.160 + 1 3300 3700
1.161 + 1 0 0 -1
1.162 +$EndComp
1.163 +Wire Bus Line
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1.165 +Connection ~ 4400 1500
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1.168 +Entry Wire Line
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1.170 +Entry Wire Line
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1.172 +Entry Wire Line
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1.174 +Entry Wire Line
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1.176 +Entry Wire Line
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1.178 +Entry Wire Line
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1.180 +Entry Wire Line
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1.182 +Entry Wire Line
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1.184 +Entry Wire Line
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1.186 +Entry Wire Line
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1.188 +Entry Wire Line
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1.190 +Entry Wire Line
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1.192 +Entry Wire Line
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1.194 +Entry Wire Line
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1.200 +Wire Wire Line
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1.214 +Wire Wire Line
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1.216 +Wire Wire Line
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1.222 +Wire Wire Line
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1.224 +Wire Wire Line
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1.227 +D0
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1.229 +D1
1.230 +Text Label 5900 3400 0 50 ~ 0
1.231 +D2
1.232 +Text Label 5900 3500 0 50 ~ 0
1.233 +D3
1.234 +Text Label 5900 3600 0 50 ~ 0
1.235 +D4
1.236 +Text Label 5900 3700 0 50 ~ 0
1.237 +D5
1.238 +Text Label 5900 3800 0 50 ~ 0
1.239 +D6
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1.241 +D7
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1.244 +Entry Wire Line
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1.246 +Entry Wire Line
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1.248 +Entry Wire Line
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1.250 +Entry Wire Line
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1.252 +Entry Wire Line
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1.254 +Entry Wire Line
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1.260 +Entry Wire Line
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1.262 +Entry Wire Line
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1.268 +Entry Wire Line
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1.270 +Entry Wire Line
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1.272 +Entry Wire Line
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1.276 +Wire Wire Line
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1.282 +Wire Wire Line
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1.290 +Wire Wire Line
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1.292 +Wire Wire Line
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1.296 +Entry Wire Line
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1.300 +Entry Wire Line
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1.302 +Entry Wire Line
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1.304 +Entry Wire Line
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1.306 +Entry Wire Line
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1.308 +Entry Wire Line
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1.310 +Entry Wire Line
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1.312 +Entry Wire Line
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1.314 +Entry Wire Line
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1.316 +Entry Wire Line
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1.318 +Entry Wire Line
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1.320 +Entry Wire Line
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1.324 +Wire Wire Line
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1.326 +Wire Wire Line
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1.330 +Wire Wire Line
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1.334 +Wire Wire Line
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1.336 +Wire Wire Line
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1.338 +Wire Wire Line
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1.340 +Wire Wire Line
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1.342 +Wire Wire Line
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1.344 +Wire Wire Line
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1.346 +Wire Wire Line
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1.353 +A1
1.354 +Text Label 2800 3400 2 50 ~ 0
1.355 +A2
1.356 +Text Label 2800 3500 2 50 ~ 0
1.357 +A3
1.358 +Text Label 2800 3600 2 50 ~ 0
1.359 +A4
1.360 +Text Label 2800 3700 2 50 ~ 0
1.361 +A5
1.362 +Text Label 2800 3800 2 50 ~ 0
1.363 +A6
1.364 +Text Label 2800 3900 2 50 ~ 0
1.365 +A7
1.366 +Text Label 2800 4000 2 50 ~ 0
1.367 +A8
1.368 +Text Label 2800 4100 2 50 ~ 0
1.369 +A9
1.370 +Text Label 2800 4200 2 50 ~ 0
1.371 +A10
1.372 +Text Label 2800 4300 2 50 ~ 0
1.373 +A11
1.374 +Text Label 2800 4400 2 50 ~ 0
1.375 +A12
1.376 +Text Label 2800 4500 2 50 ~ 0
1.377 +A13
1.378 +Text Label 2800 4600 2 50 ~ 0
1.379 +A14
1.380 +Text Label 1300 3900 0 50 ~ 0
1.381 +A0
1.382 +Text Label 1300 4000 0 50 ~ 0
1.383 +A1
1.384 +Text Label 1300 4100 0 50 ~ 0
1.385 +A2
1.386 +Text Label 1300 4200 0 50 ~ 0
1.387 +A3
1.388 +Text Label 1300 4300 0 50 ~ 0
1.389 +A4
1.390 +Text Label 1300 3000 0 50 ~ 0
1.391 +A13
1.392 +Text Label 1300 3100 0 50 ~ 0
1.393 +A12
1.394 +Text Label 1300 3200 0 50 ~ 0
1.395 +A11
1.396 +Text Label 1300 3300 0 50 ~ 0
1.397 +A10
1.398 +Text Label 1300 3400 0 50 ~ 0
1.399 +A9
1.400 +Text Label 1300 3500 0 50 ~ 0
1.401 +A8
1.402 +Text Label 1300 3600 0 50 ~ 0
1.403 +A7
1.404 +Text Label 1300 3700 0 50 ~ 0
1.405 +A6
1.406 +Text Label 1300 3800 0 50 ~ 0
1.407 +A5
1.408 +Text Label 3800 3700 0 50 ~ 0
1.409 +D0
1.410 +Text Label 3800 3800 0 50 ~ 0
1.411 +D1
1.412 +Text Label 3800 3900 0 50 ~ 0
1.413 +D2
1.414 +Text Label 3800 4000 0 50 ~ 0
1.415 +D3
1.416 +Text Label 3800 4100 0 50 ~ 0
1.417 +D4
1.418 +Text Label 3800 4200 0 50 ~ 0
1.419 +D5
1.420 +Text Label 3800 4300 0 50 ~ 0
1.421 +D6
1.422 +Text Label 3800 4400 0 50 ~ 0
1.423 +D7
1.424 +Connection ~ 5700 1300
1.425 +Wire Wire Line
1.426 + 7500 900 1800 900
1.427 +Wire Wire Line
1.428 + 1800 900 1800 2300
1.429 +Wire Wire Line
1.430 + 1800 2300 1300 2300
1.431 +Text Label 1300 2200 0 50 ~ 0
1.432 +BREAK
1.433 +Text Label 1300 2300 0 50 ~ 0
1.434 +CAPS_LOCK
1.435 +Text Label 1300 2400 0 50 ~ 0
1.436 +0V
1.437 +Text Label 1300 2500 0 50 ~ 0
1.438 +5V
1.439 +Text Label 1300 2600 0 50 ~ 0
1.440 +KBD0
1.441 +Text Label 1300 2700 0 50 ~ 0
1.442 +KBD1
1.443 +Text Label 1300 2800 0 50 ~ 0
1.444 +KBD2
1.445 +Text Label 1300 2900 0 50 ~ 0
1.446 +KBD3
1.447 +Entry Wire Line
1.448 + 1900 2600 2000 2500
1.449 +Entry Wire Line
1.450 + 1900 2700 2000 2600
1.451 +Entry Wire Line
1.452 + 1900 2800 2000 2700
1.453 +Entry Wire Line
1.454 + 1900 2900 2000 2800
1.455 +Wire Wire Line
1.456 + 1300 2600 1900 2600
1.457 +Wire Wire Line
1.458 + 1300 2700 1900 2700
1.459 +Wire Wire Line
1.460 + 1300 2800 1900 2800
1.461 +Wire Wire Line
1.462 + 1300 2900 1900 2900
1.463 +Wire Wire Line
1.464 + 4000 3500 3800 3500
1.465 +NoConn ~ 4900 4800
1.466 +$Comp
1.467 +L Jumper:Jumper_3_Open LK?
1.468 +U 1 1 61F22FC4
1.469 +P 4550 5250
1.470 +AR Path="/61F22FC4" Ref="LK?" Part="1"
1.471 +AR Path="/61F2273C/61F22FC4" Ref="LK1" Part="1"
1.472 +F 0 "LK1" H 4550 5382 50 0000 C CNN
1.473 +F 1 "ROM type" H 4550 5473 50 0000 C CNN
1.474 +F 2 "" H 4550 5250 50 0001 C CNN
1.475 +F 3 "~" H 4550 5250 50 0001 C CNN
1.476 + 1 4550 5250
1.477 + -1 0 0 1
1.478 +$EndComp
1.479 +Wire Wire Line
1.480 + 3800 3400 4100 3400
1.481 +Wire Wire Line
1.482 + 4100 3400 4100 5000
1.483 +Wire Wire Line
1.484 + 4100 5000 4550 5000
1.485 +Wire Wire Line
1.486 + 4550 5000 4550 5100
1.487 +Wire Wire Line
1.488 + 4800 5250 4800 4900
1.489 +Wire Wire Line
1.490 + 4800 4900 4900 4900
1.491 +Text GLabel 3550 2400 1 50 Input ~ 0
1.492 +5V
1.493 +Wire Wire Line
1.494 + 3550 3000 3550 2500
1.495 +Text GLabel 5200 2400 1 50 Input ~ 0
1.496 +5V
1.497 +Wire Wire Line
1.498 + 5200 2750 5200 2400
1.499 +$Comp
1.500 +L Device:C C?
1.501 +U 1 1 61F22FD5
1.502 +P 3750 2750
1.503 +AR Path="/61F22FD5" Ref="C?" Part="1"
1.504 +AR Path="/61F2273C/61F22FD5" Ref="C?" Part="1"
1.505 +F 0 "C?" H 3865 2796 50 0000 L CNN
1.506 +F 1 "A" H 3865 2705 50 0000 L CNN
1.507 +F 2 "" H 3788 2600 50 0001 C CNN
1.508 +F 3 "~" H 3750 2750 50 0001 C CNN
1.509 + 1 3750 2750
1.510 + 1 0 0 -1
1.511 +$EndComp
1.512 +Text GLabel 3550 5700 3 50 Input ~ 0
1.513 +0V
1.514 +Text GLabel 5300 5700 3 50 Input ~ 0
1.515 +0V
1.516 +Wire Wire Line
1.517 + 3550 5700 3550 4900
1.518 +Wire Wire Line
1.519 + 3550 4900 4200 4900
1.520 +Wire Wire Line
1.521 + 4200 4900 4200 3000
1.522 +Wire Wire Line
1.523 + 4200 3000 3750 3000
1.524 +Wire Wire Line
1.525 + 3750 3000 3750 2900
1.526 +Connection ~ 3550 4900
1.527 +Wire Wire Line
1.528 + 3550 4900 3550 4800
1.529 +Wire Wire Line
1.530 + 3750 2600 3750 2500
1.531 +Wire Wire Line
1.532 + 3750 2500 3550 2500
1.533 +Connection ~ 3550 2500
1.534 +Wire Wire Line
1.535 + 3550 2500 3550 2400
1.536 +Wire Wire Line
1.537 + 5300 5700 5300 5400
1.538 +Wire Wire Line
1.539 + 5300 5400 5500 5400
1.540 +Wire Wire Line
1.541 + 5500 5400 5500 5300
1.542 +Connection ~ 5300 5400
1.543 +Wire Wire Line
1.544 + 5300 5400 5300 5300
1.545 +Text GLabel 1600 2500 2 50 Input ~ 0
1.546 +5V
1.547 +Text GLabel 1600 2400 2 50 Input ~ 0
1.548 +0V
1.549 +Wire Wire Line
1.550 + 1300 2400 1600 2400
1.551 +Wire Wire Line
1.552 + 1300 2500 1600 2500
1.553 +Text GLabel 4300 5700 3 50 Input ~ 0
1.554 +0V
1.555 +Wire Wire Line
1.556 + 4300 5700 4300 5250
1.557 +Text Label 4800 5200 1 50 ~ 0
1.558 +Toshiba
1.559 +Text Label 4300 5300 3 50 ~ 0
1.560 +Hitachi
1.561 +Wire Wire Line
1.562 + 1900 2200 1300 2200
1.563 +Wire Wire Line
1.564 + 5700 1300 1900 1300
1.565 +Wire Wire Line
1.566 + 1900 1300 1900 2200
1.567 +Text GLabel 6000 4700 2 50 Input ~ 0
1.568 +RDY
1.569 +Wire Wire Line
1.570 + 5900 4200 6200 4200
1.571 +Wire Wire Line
1.572 + 5900 4100 6800 4100
1.573 +Wire Wire Line
1.574 + 5700 1300 7500 1300
1.575 +Wire Bus Line
1.576 + 4000 6100 6700 6100
1.577 +Wire Wire Line
1.578 + 5900 4700 6000 4700
1.579 +Wire Wire Line
1.580 + 5900 3200 6600 3200
1.581 +Wire Wire Line
1.582 + 5900 3300 6600 3300
1.583 +Wire Wire Line
1.584 + 5900 3400 6600 3400
1.585 +Wire Wire Line
1.586 + 5900 3500 6600 3500
1.587 +Wire Wire Line
1.588 + 5900 3600 6600 3600
1.589 +Wire Wire Line
1.590 + 5900 3700 6600 3700
1.591 +Wire Wire Line
1.592 + 5900 3800 6600 3800
1.593 +Wire Wire Line
1.594 + 5900 3900 6600 3900
1.595 +Text GLabel 8500 4000 2 50 Input ~ 0
1.596 +~NMI
1.597 +Text GLabel 6200 4200 2 50 Input ~ 0
1.598 +~IRQ
1.599 +Text GLabel 6000 4300 2 50 Output ~ 0
1.600 +RnW
1.601 +Text GLabel 7700 5000 2 50 Input ~ 0
1.602 +PHI_OUT
1.603 +Text GLabel 6800 1500 2 50 Output ~ 0
1.604 +CPU_ADDRESS
1.605 +Text GLabel 6800 6100 2 50 BiDi ~ 0
1.606 +CPU_DATA
1.607 +Wire Bus Line
1.608 + 6800 6100 6700 6100
1.609 +Connection ~ 6700 6100
1.610 +Text GLabel 6800 1100 2 50 Output ~ 0
1.611 +KBD_DATA
1.612 +Wire Bus Line
1.613 + 6800 1100 2000 1100
1.614 +Text GLabel 7500 1300 2 50 Output ~ 0
1.615 +~RST
1.616 +Text GLabel 6800 1700 2 50 Input ~ 0
1.617 +ROM
1.618 +Text GLabel 7500 900 2 50 Output ~ 0
1.619 +CAPS_LOCK
1.620 +Text Notes 6800 3200 0 50 ~ 0
1.621 +Issue 6 boards tend to have\nIC18 (74LS08) fitted for some\nkind of buffering for ~NMI\nand for PHI_OUT.\n\nLK8 is made to enable buffering via IC18 for ~NMI.\nLK9 is made to disable buffering via IC18 for PHI_OUT.\n\nOn such boards, without any links made, buffering\nonly seems to be done for PHI_OUT.\n
1.622 +$Comp
1.623 +L 74xx:74LS08 IC18
1.624 +U 4 1 61F0E37D
1.625 +P 7200 4900
1.626 +F 0 "IC18" H 7200 4583 50 0000 C CNN
1.627 +F 1 "74LS08" H 7200 4674 50 0000 C CNN
1.628 +F 2 "" H 7200 4900 50 0001 C CNN
1.629 +F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 4900 50 0001 C CNN
1.630 + 4 7200 4900
1.631 + -1 0 0 1
1.632 +$EndComp
1.633 +Text GLabel 7700 4500 2 50 Input ~ 0
1.634 +BUFFER_ENABLE
1.635 +Wire Wire Line
1.636 + 7700 4500 7600 4500
1.637 +Wire Wire Line
1.638 + 7700 5000 7600 5000
1.639 +Wire Wire Line
1.640 + 5900 4900 6800 4900
1.641 +$Comp
1.642 +L Jumper:Jumper_2_Open LK9
1.643 +U 1 1 61F22F77
1.644 +P 7200 5400
1.645 +F 0 "LK9" H 7200 5635 50 0000 C CNN
1.646 +F 1 "Disable buffer" H 7200 5544 50 0000 C CNN
1.647 +F 2 "" H 7200 5400 50 0001 C CNN
1.648 +F 3 "~" H 7200 5400 50 0001 C CNN
1.649 + 1 7200 5400
1.650 + 1 0 0 -1
1.651 +$EndComp
1.652 +Wire Wire Line
1.653 + 7400 5400 7600 5400
1.654 +Wire Wire Line
1.655 + 7600 5400 7600 5000
1.656 +Connection ~ 7600 5000
1.657 +Wire Wire Line
1.658 + 7600 5000 7500 5000
1.659 +Wire Wire Line
1.660 + 7000 5400 6800 5400
1.661 +Wire Wire Line
1.662 + 6800 5400 6800 4900
1.663 +Connection ~ 6800 4900
1.664 +Wire Wire Line
1.665 + 6800 4900 6900 4900
1.666 +$Comp
1.667 +L 74xx:74LS08 IC18
1.668 +U 2 1 61F3624E
1.669 +P 7200 4100
1.670 +F 0 "IC18" H 7200 4425 50 0000 C CNN
1.671 +F 1 "74LS08" H 7200 4334 50 0000 C CNN
1.672 +F 2 "" H 7200 4100 50 0001 C CNN
1.673 +F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 7200 4100 50 0001 C CNN
1.674 + 2 7200 4100
1.675 + -1 0 0 -1
1.676 +$EndComp
1.677 +$Comp
1.678 +L Jumper:Jumper_2_Open LK8
1.679 +U 1 1 61F363E2
1.680 +P 8000 4000
1.681 +F 0 "LK8" H 8000 4235 50 0000 C CNN
1.682 +F 1 "Enable buffer" H 8000 4144 50 0000 C CNN
1.683 +F 2 "" H 8000 4000 50 0001 C CNN
1.684 +F 3 "~" H 8000 4000 50 0001 C CNN
1.685 + 1 8000 4000
1.686 + 1 0 0 -1
1.687 +$EndComp
1.688 +Text GLabel 8100 3600 2 50 Input ~ 0
1.689 +5V
1.690 +Wire Wire Line
1.691 + 7800 4000 7600 4000
1.692 +Wire Wire Line
1.693 + 7600 4500 7600 4200
1.694 +Wire Wire Line
1.695 + 7600 4200 7500 4200
1.696 +Connection ~ 7600 4500
1.697 +Wire Wire Line
1.698 + 7600 4500 7600 4800
1.699 +Wire Wire Line
1.700 + 7600 4800 7500 4800
1.701 +Wire Wire Line
1.702 + 8500 4000 8400 4000
1.703 +Wire Wire Line
1.704 + 7600 4000 7600 3600
1.705 +Connection ~ 7600 4000
1.706 +Wire Wire Line
1.707 + 7600 4000 7500 4000
1.708 +$Comp
1.709 +L Device:R R74
1.710 +U 1 1 61F7EEAC
1.711 +P 7850 3600
1.712 +F 0 "R74" V 7643 3600 50 0000 C CNN
1.713 +F 1 "4700R" V 7734 3600 50 0000 C CNN
1.714 +F 2 "" V 7780 3600 50 0001 C CNN
1.715 +F 3 "~" H 7850 3600 50 0001 C CNN
1.716 + 1 7850 3600
1.717 + 0 1 1 0
1.718 +$EndComp
1.719 +Wire Wire Line
1.720 + 7600 3600 7700 3600
1.721 +Wire Wire Line
1.722 + 8000 3600 8100 3600
1.723 +Wire Wire Line
1.724 + 6800 4100 6800 3300
1.725 +Wire Wire Line
1.726 + 6800 3300 8400 3300
1.727 +Wire Wire Line
1.728 + 8400 3300 8400 4000
1.729 +Connection ~ 6800 4100
1.730 +Wire Wire Line
1.731 + 6800 4100 6900 4100
1.732 +Connection ~ 8400 4000
1.733 +Wire Wire Line
1.734 + 8400 4000 8200 4000
1.735 +$Comp
1.736 +L 74xx:74LS08 IC18
1.737 +U 5 1 61FA23D2
1.738 +P 9300 3100
1.739 +F 0 "IC18" H 9530 3146 50 0000 L CNN
1.740 +F 1 "74LS08" H 9530 3055 50 0000 L CNN
1.741 +F 2 "" H 9300 3100 50 0001 C CNN
1.742 +F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 9300 3100 50 0001 C CNN
1.743 + 5 9300 3100
1.744 + 1 0 0 -1
1.745 +$EndComp
1.746 +Text GLabel 9300 2500 1 50 Input ~ 0
1.747 +5V
1.748 +Wire Wire Line
1.749 + 9300 2500 9300 2600
1.750 +Text GLabel 9300 3700 3 50 Input ~ 0
1.751 +0V
1.752 +Wire Wire Line
1.753 + 9300 3700 9300 3600
1.754 +Wire Bus Line
1.755 + 2000 1100 2000 2800
1.756 +Wire Bus Line
1.757 + 6700 3300 6700 6100
1.758 +Wire Bus Line
1.759 + 4000 3800 4000 6100
1.760 +Wire Bus Line
1.761 + 2200 1500 2200 4500
1.762 +Wire Bus Line
1.763 + 4400 1500 4400 4500
1.764 +$EndSCHEMATC