1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/clocks.sch Wed Jan 26 22:13:42 2022 +0100
1.3 @@ -0,0 +1,453 @@
1.4 +EESchema Schematic File Version 4
1.5 +LIBS:AcornElectronMainboard-cache
1.6 +EELAYER 26 0
1.7 +EELAYER END
1.8 +$Descr A4 11693 8268
1.9 +encoding utf-8
1.10 +Sheet 2 9
1.11 +Title ""
1.12 +Date ""
1.13 +Rev ""
1.14 +Comp ""
1.15 +Comment1 ""
1.16 +Comment2 ""
1.17 +Comment3 ""
1.18 +Comment4 ""
1.19 +$EndDescr
1.20 +$Comp
1.21 +L Device:R R?
1.22 +U 1 1 61DF6407
1.23 +P 2000 2900
1.24 +AR Path="/61DF6407" Ref="R?" Part="1"
1.25 +AR Path="/61DF4BC2/61DF6407" Ref="R3" Part="1"
1.26 +F 0 "R3" V 1793 2900 50 0000 C CNN
1.27 +F 1 "330R" V 1884 2900 50 0000 C CNN
1.28 +F 2 "" V 1930 2900 50 0001 C CNN
1.29 +F 3 "~" H 2000 2900 50 0001 C CNN
1.30 + 1 2000 2900
1.31 + 0 1 1 0
1.32 +$EndComp
1.33 +$Comp
1.34 +L Device:R R?
1.35 +U 1 1 61DF640E
1.36 +P 2900 2900
1.37 +AR Path="/61DF640E" Ref="R?" Part="1"
1.38 +AR Path="/61DF4BC2/61DF640E" Ref="R4" Part="1"
1.39 +F 0 "R4" V 2693 2900 50 0000 C CNN
1.40 +F 1 "330R" V 2784 2900 50 0000 C CNN
1.41 +F 2 "" V 2830 2900 50 0001 C CNN
1.42 +F 3 "~" H 2900 2900 50 0001 C CNN
1.43 + 1 2900 2900
1.44 + 0 1 1 0
1.45 +$EndComp
1.46 +$Comp
1.47 +L Device:Crystal X?
1.48 +U 1 1 61DF6415
1.49 +P 2450 2600
1.50 +AR Path="/61DF6415" Ref="X?" Part="1"
1.51 +AR Path="/61DF4BC2/61DF6415" Ref="X2" Part="1"
1.52 +F 0 "X2" H 2450 2868 50 0000 C CNN
1.53 +F 1 "17.7345MHz" H 2450 2777 50 0000 C CNN
1.54 +F 2 "" H 2450 2600 50 0001 C CNN
1.55 +F 3 "~" H 2450 2600 50 0001 C CNN
1.56 + 1 2450 2600
1.57 + 1 0 0 -1
1.58 +$EndComp
1.59 +$Comp
1.60 +L 74xx:74LS04 IC?
1.61 +U 1 1 61DF641C
1.62 +P 2000 3400
1.63 +AR Path="/61DF641C" Ref="IC?" Part="1"
1.64 +AR Path="/61DF4BC2/61DF641C" Ref="IC8" Part="1"
1.65 +F 0 "IC8" H 2000 3717 50 0000 C CNN
1.66 +F 1 "74LS04" H 2000 3626 50 0000 C CNN
1.67 +F 2 "" H 2000 3400 50 0001 C CNN
1.68 +F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2000 3400 50 0001 C CNN
1.69 + 1 2000 3400
1.70 + 1 0 0 -1
1.71 +$EndComp
1.72 +$Comp
1.73 +L 74xx:74LS04 IC?
1.74 +U 2 1 61DF6423
1.75 +P 2900 3400
1.76 +AR Path="/61DF6423" Ref="IC?" Part="2"
1.77 +AR Path="/61DF4BC2/61DF6423" Ref="IC8" Part="2"
1.78 +F 0 "IC8" H 2900 3717 50 0000 C CNN
1.79 +F 1 "74LS04" H 2900 3626 50 0000 C CNN
1.80 +F 2 "" H 2900 3400 50 0001 C CNN
1.81 +F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2900 3400 50 0001 C CNN
1.82 + 2 2900 3400
1.83 + 1 0 0 -1
1.84 +$EndComp
1.85 +$Comp
1.86 +L 74xx:74LS04 IC?
1.87 +U 3 1 61DF642A
1.88 +P 3500 3400
1.89 +AR Path="/61DF642A" Ref="IC?" Part="3"
1.90 +AR Path="/61DF4BC2/61DF642A" Ref="IC8" Part="3"
1.91 +F 0 "IC8" H 3500 3717 50 0000 C CNN
1.92 +F 1 "74LS04" H 3500 3626 50 0000 C CNN
1.93 +F 2 "" H 3500 3400 50 0001 C CNN
1.94 +F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 3500 3400 50 0001 C CNN
1.95 + 3 3500 3400
1.96 + 1 0 0 -1
1.97 +$EndComp
1.98 +$Comp
1.99 +L Device:C C?
1.100 +U 1 1 61DF6431
1.101 +P 2450 3400
1.102 +AR Path="/61DF6431" Ref="C?" Part="1"
1.103 +AR Path="/61DF4BC2/61DF6431" Ref="C5" Part="1"
1.104 +F 0 "C5" V 2198 3400 50 0000 C CNN
1.105 +F 1 "100pF" V 2289 3400 50 0000 C CNN
1.106 +F 2 "" H 2488 3250 50 0001 C CNN
1.107 +F 3 "~" H 2450 3400 50 0001 C CNN
1.108 + 1 2450 3400
1.109 + 0 1 1 0
1.110 +$EndComp
1.111 +$Comp
1.112 +L Device:C C?
1.113 +U 1 1 61DF6438
1.114 +P 3500 2600
1.115 +AR Path="/61DF6438" Ref="C?" Part="1"
1.116 +AR Path="/61DF4BC2/61DF6438" Ref="C6" Part="1"
1.117 +F 0 "C6" V 3248 2600 50 0000 C CNN
1.118 +F 1 "33pF" V 3339 2600 50 0000 C CNN
1.119 +F 2 "" H 3538 2450 50 0001 C CNN
1.120 +F 3 "~" H 3500 2600 50 0001 C CNN
1.121 + 1 3500 2600
1.122 + 0 1 1 0
1.123 +$EndComp
1.124 +Wire Wire Line
1.125 + 1700 3400 1700 2900
1.126 +Wire Wire Line
1.127 + 1700 2600 2300 2600
1.128 +Wire Wire Line
1.129 + 1700 2900 1850 2900
1.130 +Connection ~ 1700 2900
1.131 +Wire Wire Line
1.132 + 1700 2900 1700 2600
1.133 +Wire Wire Line
1.134 + 2300 3400 2300 2900
1.135 +Wire Wire Line
1.136 + 2300 2900 2150 2900
1.137 +Connection ~ 2300 3400
1.138 +Wire Wire Line
1.139 + 2600 3400 2600 2900
1.140 +Wire Wire Line
1.141 + 2600 2900 2750 2900
1.142 +Connection ~ 2600 3400
1.143 +Wire Wire Line
1.144 + 3050 2900 3200 2900
1.145 +Wire Wire Line
1.146 + 3200 2900 3200 3400
1.147 +Connection ~ 3200 3400
1.148 +Wire Wire Line
1.149 + 3200 2900 3200 2600
1.150 +Wire Wire Line
1.151 + 3200 2600 2600 2600
1.152 +Connection ~ 3200 2900
1.153 +Wire Wire Line
1.154 + 3200 2600 3350 2600
1.155 +Connection ~ 3200 2600
1.156 +Text GLabel 3750 2600 2 50 Input ~ 0
1.157 +0V
1.158 +Wire Wire Line
1.159 + 3750 2600 3650 2600
1.160 +Wire Wire Line
1.161 + 3800 3400 3900 3400
1.162 +Text GLabel 3900 3400 2 50 Output ~ 0
1.163 +CLOCK_VIDEO
1.164 +$Comp
1.165 +L Device:R R?
1.166 +U 1 1 61EEF884
1.167 +P 2000 1300
1.168 +AR Path="/61EEF884" Ref="R?" Part="1"
1.169 +AR Path="/61DF4BC2/61EEF884" Ref="R1" Part="1"
1.170 +F 0 "R1" V 1793 1300 50 0000 C CNN
1.171 +F 1 "330R" V 1884 1300 50 0000 C CNN
1.172 +F 2 "" V 1930 1300 50 0001 C CNN
1.173 +F 3 "~" H 2000 1300 50 0001 C CNN
1.174 + 1 2000 1300
1.175 + 0 1 1 0
1.176 +$EndComp
1.177 +$Comp
1.178 +L Device:R R?
1.179 +U 1 1 61EEF88B
1.180 +P 2900 1300
1.181 +AR Path="/61EEF88B" Ref="R?" Part="1"
1.182 +AR Path="/61DF4BC2/61EEF88B" Ref="R2" Part="1"
1.183 +F 0 "R2" V 2693 1300 50 0000 C CNN
1.184 +F 1 "330R" V 2784 1300 50 0000 C CNN
1.185 +F 2 "" V 2830 1300 50 0001 C CNN
1.186 +F 3 "~" H 2900 1300 50 0001 C CNN
1.187 + 1 2900 1300
1.188 + 0 1 1 0
1.189 +$EndComp
1.190 +$Comp
1.191 +L Device:Crystal X?
1.192 +U 1 1 61EEF892
1.193 +P 2450 1000
1.194 +AR Path="/61EEF892" Ref="X?" Part="1"
1.195 +AR Path="/61DF4BC2/61EEF892" Ref="X1" Part="1"
1.196 +F 0 "X1" H 2450 1268 50 0000 C CNN
1.197 +F 1 "16MHz" H 2450 1177 50 0000 C CNN
1.198 +F 2 "" H 2450 1000 50 0001 C CNN
1.199 +F 3 "~" H 2450 1000 50 0001 C CNN
1.200 + 1 2450 1000
1.201 + 1 0 0 -1
1.202 +$EndComp
1.203 +$Comp
1.204 +L 74xx:74LS04 IC?
1.205 +U 6 1 61EEF899
1.206 +P 2000 1800
1.207 +AR Path="/61EEF899" Ref="IC?" Part="6"
1.208 +AR Path="/61DF4BC2/61EEF899" Ref="IC8" Part="6"
1.209 +F 0 "IC8" H 2000 2117 50 0000 C CNN
1.210 +F 1 "74LS04" H 2000 2026 50 0000 C CNN
1.211 +F 2 "" H 2000 1800 50 0001 C CNN
1.212 +F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2000 1800 50 0001 C CNN
1.213 + 6 2000 1800
1.214 + 1 0 0 -1
1.215 +$EndComp
1.216 +$Comp
1.217 +L 74xx:74LS04 IC?
1.218 +U 5 1 61EEF8A0
1.219 +P 2900 1800
1.220 +AR Path="/61EEF8A0" Ref="IC?" Part="5"
1.221 +AR Path="/61DF4BC2/61EEF8A0" Ref="IC8" Part="5"
1.222 +F 0 "IC8" H 2900 2117 50 0000 C CNN
1.223 +F 1 "74LS04" H 2900 2026 50 0000 C CNN
1.224 +F 2 "" H 2900 1800 50 0001 C CNN
1.225 +F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2900 1800 50 0001 C CNN
1.226 + 5 2900 1800
1.227 + 1 0 0 -1
1.228 +$EndComp
1.229 +$Comp
1.230 +L 74xx:74LS04 IC?
1.231 +U 4 1 61EEF8A7
1.232 +P 3500 1800
1.233 +AR Path="/61EEF8A7" Ref="IC?" Part="4"
1.234 +AR Path="/61DF4BC2/61EEF8A7" Ref="IC8" Part="4"
1.235 +F 0 "IC8" H 3500 2117 50 0000 C CNN
1.236 +F 1 "74LS04" H 3500 2026 50 0000 C CNN
1.237 +F 2 "" H 3500 1800 50 0001 C CNN
1.238 +F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 3500 1800 50 0001 C CNN
1.239 + 4 3500 1800
1.240 + 1 0 0 -1
1.241 +$EndComp
1.242 +$Comp
1.243 +L Device:C C?
1.244 +U 1 1 61EEF8AE
1.245 +P 2450 1800
1.246 +AR Path="/61EEF8AE" Ref="C?" Part="1"
1.247 +AR Path="/61DF4BC2/61EEF8AE" Ref="C3" Part="1"
1.248 +F 0 "C3" V 2198 1800 50 0000 C CNN
1.249 +F 1 "100pF" V 2289 1800 50 0000 C CNN
1.250 +F 2 "" H 2488 1650 50 0001 C CNN
1.251 +F 3 "~" H 2450 1800 50 0001 C CNN
1.252 + 1 2450 1800
1.253 + 0 1 1 0
1.254 +$EndComp
1.255 +$Comp
1.256 +L Device:C C?
1.257 +U 1 1 61EEF8B5
1.258 +P 3500 1000
1.259 +AR Path="/61EEF8B5" Ref="C?" Part="1"
1.260 +AR Path="/61DF4BC2/61EEF8B5" Ref="C4" Part="1"
1.261 +F 0 "C4" V 3248 1000 50 0000 C CNN
1.262 +F 1 "33pF" V 3339 1000 50 0000 C CNN
1.263 +F 2 "" H 3538 850 50 0001 C CNN
1.264 +F 3 "~" H 3500 1000 50 0001 C CNN
1.265 + 1 3500 1000
1.266 + 0 1 1 0
1.267 +$EndComp
1.268 +Wire Wire Line
1.269 + 1700 1800 1700 1300
1.270 +Wire Wire Line
1.271 + 1700 1000 2300 1000
1.272 +Wire Wire Line
1.273 + 1700 1300 1850 1300
1.274 +Connection ~ 1700 1300
1.275 +Wire Wire Line
1.276 + 1700 1300 1700 1000
1.277 +Wire Wire Line
1.278 + 2300 1800 2300 1300
1.279 +Wire Wire Line
1.280 + 2300 1300 2150 1300
1.281 +Connection ~ 2300 1800
1.282 +Wire Wire Line
1.283 + 2600 1800 2600 1300
1.284 +Wire Wire Line
1.285 + 2600 1300 2750 1300
1.286 +Connection ~ 2600 1800
1.287 +Wire Wire Line
1.288 + 3050 1300 3200 1300
1.289 +Wire Wire Line
1.290 + 3200 1300 3200 1800
1.291 +Connection ~ 3200 1800
1.292 +Wire Wire Line
1.293 + 3200 1300 3200 1000
1.294 +Wire Wire Line
1.295 + 3200 1000 2600 1000
1.296 +Connection ~ 3200 1300
1.297 +Wire Wire Line
1.298 + 3200 1000 3350 1000
1.299 +Connection ~ 3200 1000
1.300 +Text GLabel 3750 1000 2 50 Input ~ 0
1.301 +0V
1.302 +Wire Wire Line
1.303 + 3750 1000 3650 1000
1.304 +Wire Wire Line
1.305 + 3800 1800 4100 1800
1.306 +Text Notes 1600 1300 2 50 ~ 0
1.307 +Service Manual indicates\n820R values.\nIssue 4 board suggests\ngrey, red, brown, gold.
1.308 +Text GLabel 5700 1100 2 50 Output ~ 0
1.309 +CLOCK_16MHz
1.310 +$Comp
1.311 +L 74xx:74LS163 IC?
1.312 +U 1 1 61F9FB39
1.313 +P 6500 2700
1.314 +AR Path="/61F9FB39" Ref="IC?" Part="1"
1.315 +AR Path="/61DF4BC2/61F9FB39" Ref="IC9" Part="1"
1.316 +F 0 "IC9" H 6200 3600 50 0000 C CNN
1.317 +F 1 "74LS163" H 6200 3500 50 0000 C CNN
1.318 +F 2 "" H 6500 2700 50 0001 C CNN
1.319 +F 3 "http://www.ti.com/lit/gpn/sn74LS169" H 6500 2700 50 0001 C CNN
1.320 + 1 6500 2700
1.321 + 1 0 0 -1
1.322 +$EndComp
1.323 +Wire Wire Line
1.324 + 5900 2500 5900 2400
1.325 +Wire Wire Line
1.326 + 5900 2400 6000 2400
1.327 +Wire Wire Line
1.328 + 5900 2500 6000 2500
1.329 +Wire Wire Line
1.330 + 7000 2500 7200 2500
1.331 +Text GLabel 6500 3650 3 50 Input ~ 0
1.332 +0V
1.333 +Wire Wire Line
1.334 + 6500 3650 6500 3500
1.335 +Text GLabel 6500 1800 1 50 Input ~ 0
1.336 +5V
1.337 +Wire Wire Line
1.338 + 6500 1900 6500 1800
1.339 +Wire Wire Line
1.340 + 4100 3000 6000 3000
1.341 +Text GLabel 5800 3200 0 50 Input ~ 0
1.342 +0V
1.343 +NoConn ~ 7000 2300
1.344 +NoConn ~ 7000 2200
1.345 +NoConn ~ 7000 2700
1.346 +Wire Wire Line
1.347 + 5800 3200 5900 3200
1.348 +Wire Wire Line
1.349 + 5900 2400 5900 2300
1.350 +Wire Wire Line
1.351 + 5900 2300 6000 2300
1.352 +Connection ~ 5900 2400
1.353 +Wire Wire Line
1.354 + 5900 2300 5900 2200
1.355 +Wire Wire Line
1.356 + 5900 2200 6000 2200
1.357 +Connection ~ 5900 2300
1.358 +$Comp
1.359 +L 74xx:74LS00 U?
1.360 +U 1 1 61F9FB55
1.361 +P 7600 2500
1.362 +AR Path="/61F9FB55" Ref="U?" Part="1"
1.363 +AR Path="/61DF4BC2/61F9FB55" Ref="U?" Part="1"
1.364 +F 0 "U?" H 7600 2825 50 0000 C CNN
1.365 +F 1 "74LS00" H 7600 2734 50 0000 C CNN
1.366 +F 2 "" H 7600 2500 50 0001 C CNN
1.367 +F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 7600 2500 50 0001 C CNN
1.368 + 1 7600 2500
1.369 + 1 0 0 -1
1.370 +$EndComp
1.371 +Wire Wire Line
1.372 + 7000 2400 7300 2400
1.373 +Wire Wire Line
1.374 + 7200 2500 7200 2600
1.375 +Wire Wire Line
1.376 + 7200 2600 7300 2600
1.377 +Wire Wire Line
1.378 + 7900 2500 7900 1600
1.379 +Wire Wire Line
1.380 + 7900 1600 5600 1600
1.381 +Wire Wire Line
1.382 + 5600 1600 5600 2700
1.383 +Wire Wire Line
1.384 + 5600 2700 6000 2700
1.385 +Wire Wire Line
1.386 + 5900 2500 5900 2800
1.387 +Connection ~ 5900 2500
1.388 +Connection ~ 5900 3200
1.389 +Wire Wire Line
1.390 + 5900 3200 6000 3200
1.391 +Wire Wire Line
1.392 + 6000 2800 5900 2800
1.393 +Connection ~ 5900 2800
1.394 +Wire Wire Line
1.395 + 5900 2800 5900 2900
1.396 +Wire Wire Line
1.397 + 6000 2900 5900 2900
1.398 +Connection ~ 5900 2900
1.399 +Wire Wire Line
1.400 + 5900 2900 5900 3200
1.401 +Text Notes 6900 3300 0 50 ~ 0
1.402 +Service Manual and issue 4\nuse 74LS169 for IC9.
1.403 +Wire Wire Line
1.404 + 4100 3000 4100 1800
1.405 +Connection ~ 4100 1800
1.406 +Wire Wire Line
1.407 + 4100 1800 4100 1200
1.408 +Text GLabel 8100 2800 2 50 Output ~ 0
1.409 +CLOCK_16MHz_DIV_13
1.410 +Wire Wire Line
1.411 + 8100 2800 7200 2800
1.412 +Wire Wire Line
1.413 + 7200 2800 7200 2600
1.414 +Connection ~ 7200 2600
1.415 +Text Notes 4200 2550 0 50 ~ 0
1.416 +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.
1.417 +$Comp
1.418 +L 74xx:74LS08 IC18
1.419 +U 3 1 61F98BCB
1.420 +P 5100 1100
1.421 +F 0 "IC18" H 5100 1425 50 0000 C CNN
1.422 +F 1 "74LS08" H 5100 1334 50 0000 C CNN
1.423 +F 2 "" H 5100 1100 50 0001 C CNN
1.424 +F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 5100 1100 50 0001 C CNN
1.425 + 3 5100 1100
1.426 + 1 0 0 -1
1.427 +$EndComp
1.428 +Wire Wire Line
1.429 + 4100 1200 4800 1200
1.430 +Text GLabel 4700 1000 0 50 Input ~ 0
1.431 +BUFFER_ENABLE
1.432 +Wire Wire Line
1.433 + 4700 1000 4800 1000
1.434 +Wire Wire Line
1.435 + 5700 1100 5500 1100
1.436 +$Comp
1.437 +L Jumper:Jumper_2_Open LK10
1.438 +U 1 1 61F9F418
1.439 +P 4500 1800
1.440 +F 0 "LK10" H 4500 2035 50 0000 C CNN
1.441 +F 1 "Disable buffer" H 4500 1944 50 0000 C CNN
1.442 +F 2 "" H 4500 1800 50 0001 C CNN
1.443 +F 3 "~" H 4500 1800 50 0001 C CNN
1.444 + 1 4500 1800
1.445 + 1 0 0 -1
1.446 +$EndComp
1.447 +Wire Wire Line
1.448 + 4100 1800 4300 1800
1.449 +Wire Wire Line
1.450 + 4700 1800 5500 1800
1.451 +Wire Wire Line
1.452 + 5500 1800 5500 1100
1.453 +Connection ~ 5500 1100
1.454 +Wire Wire Line
1.455 + 5500 1100 5400 1100
1.456 +$EndSCHEMATC