1 EESchema Schematic File Version 4
11 Comment1 "License: Creative Commons Attribution Share-Alike (CC BY-SA)"
12 Comment2 "Copyright (C) 2020 John Tsiombikas <nuclear@member.fsf.org>"
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21 F 1 "Z80CPU" H 2000 4050 50 0000 C CNN
22 F 2 "" H 2000 4450 50 0001 C CNN
23 F 3 "www.zilog.com/manage_directlink.php?filepath=docs/z80/um0080" H 2000 4450 50 0001 C CNN
28 L Memory_EEPROM:28C256 U6
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56 F 3 "" H 3850 5500 50 0001 C CNN
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66 F 2 "" H 2000 2550 50 0001 C CNN
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75 F 0 "#PWR015" H 3850 3150 50 0001 C CNN
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374 F 2 "" H 3350 5100 50 0001 C CNN
375 F 3 "" H 3350 5100 50 0001 C CNN
383 Connection ~ 3150 2600
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415 F 1 "mc68681" V 7350 3900 50 0000 C CNN
416 F 2 "" H 7900 3350 50 0001 C CNN
417 F 3 "" H 7900 3350 50 0001 C CNN
422 L z80comp2:sram_um61512ak U7
425 F 0 "U7" H 5700 3150 60 0000 C CNN
426 F 1 "sram_um61512ak" V 5550 4300 60 0000 C CNN
427 F 2 "" H 5450 3500 60 0000 C CNN
428 F 3 "" H 5450 3500 60 0000 C CNN
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624 F 2 "" H 5550 3050 50 0001 C CNN
625 F 3 "" H 5550 3050 50 0001 C CNN
633 F 0 "#PWR017" H 4650 5150 50 0001 C CNN
634 F 1 "VCC" H 4667 5473 50 0000 C CNN
635 F 2 "" H 4650 5300 50 0001 C CNN
636 F 3 "" H 4650 5300 50 0001 C CNN
648 F 0 "#PWR020" H 5550 5350 50 0001 C CNN
649 F 1 "GND" H 5555 5427 50 0000 C CNN
650 F 2 "" H 5550 5600 50 0001 C CNN
651 F 3 "" H 5550 5600 50 0001 C CNN
659 F 0 "#PWR021" H 7350 5350 50 0001 C CNN
660 F 1 "GND" H 7355 5427 50 0000 C CNN
661 F 2 "" H 7350 5600 50 0001 C CNN
662 F 3 "" H 7350 5600 50 0001 C CNN
670 F 0 "#PWR022" H 7350 2250 50 0001 C CNN
671 F 1 "VCC" H 7367 2573 50 0000 C CNN
672 F 2 "" H 7350 2400 50 0001 C CNN
673 F 3 "" H 7350 2400 50 0001 C CNN
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704 F 2 "" H 3800 1650 50 0001 C CNN
705 F 3 "" H 3800 1650 50 0001 C CNN
713 F 0 "#PWR013" H 3850 600 50 0001 C CNN
714 F 1 "VCC" H 3867 923 50 0000 C CNN
715 F 2 "" H 3850 750 50 0001 C CNN
716 F 3 "" H 3850 750 50 0001 C CNN
724 F 0 "#PWR014" H 3850 2100 50 0001 C CNN
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825 F 1 "3.6864MHz" V 6700 5450 50 0000 R CNN
826 F 2 "" H 6550 5150 50 0001 C CNN
827 F 3 "~" H 6550 5150 50 0001 C CNN
837 F 0 "C11" H 6750 5400 50 0000 R CNN
838 F 1 "5pF" H 6750 5500 50 0000 R CNN
839 F 2 "" H 6550 5400 50 0001 C CNN
840 F 3 "~" H 6550 5400 50 0001 C CNN
848 F 0 "C10" H 6550 5200 50 0000 R CNN
849 F 1 "15pF" H 6550 5300 50 0000 R CNN
850 F 2 "" H 6350 5200 50 0001 C CNN
851 F 3 "~" H 6350 5200 50 0001 C CNN
861 Connection ~ 6550 5250
871 L Interface_UART:MAX232 U9
874 F 0 "U9" H 9500 2850 50 0000 C CNN
875 F 1 "MAX232" H 9300 4150 50 0000 C CNN
876 F 2 "" H 9350 2850 50 0001 L CNN
877 F 3 "http://www.ti.com/lit/ds/symlink/max232.pdf" H 9300 4000 50 0001 C CNN
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912 F 1 "GND" H 9305 4927 50 0000 C CNN
913 F 2 "" H 9300 5100 50 0001 C CNN
914 F 3 "" H 9300 5100 50 0001 C CNN
922 F 0 "#PWR025" H 9300 2550 50 0001 C CNN
923 F 1 "VCC" H 9317 2873 50 0000 C CNN
924 F 2 "" H 9300 2700 50 0001 C CNN
925 F 3 "" H 9300 2700 50 0001 C CNN
933 F 0 "C12" H 8500 3250 50 0000 L CNN
934 F 1 "0.1uF" H 8400 2950 50 0000 L CNN
935 F 2 "" H 8538 3000 50 0001 C CNN
936 F 3 "~" H 8500 3150 50 0001 C CNN
944 F 0 "C13" H 9950 3250 50 0000 L CNN
945 F 1 "0.1uF" H 9850 3050 50 0000 L CNN
946 F 2 "" H 10138 3000 50 0001 C CNN
947 F 3 "~" H 10100 3150 50 0001 C CNN
955 F 0 "C14" V 10250 3600 50 0000 L CNN
956 F 1 "0.1uF" V 10250 3200 50 0000 L CNN
957 F 2 "" H 10338 3350 50 0001 C CNN
958 F 3 "~" H 10300 3500 50 0001 C CNN
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971 F 1 "0.1uF" V 10250 3500 50 0000 L CNN
972 F 2 "" H 10338 3650 50 0001 C CNN
973 F 3 "~" H 10300 3800 50 0001 C CNN
981 F 0 "#PWR029" H 10650 3250 50 0001 C CNN
982 F 1 "VCC" H 10667 3573 50 0000 C CNN
983 F 2 "" H 10650 3400 50 0001 C CNN
984 F 3 "" H 10650 3400 50 0001 C CNN
989 10650 3400 10650 3500
991 10650 3500 10450 3500
996 F 0 "#PWR027" H 10550 3600 50 0001 C CNN
997 F 1 "GND" H 10555 3677 50 0000 C CNN
998 F 2 "" H 10550 3850 50 0001 C CNN
999 F 3 "" H 10550 3850 50 0001 C CNN
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1028 F 1 "SERB" H 8650 4600 50 0000 R CNN
1029 F 2 "" H 8550 4850 50 0001 C CNN
1030 F 3 "~" H 8550 4850 50 0001 C CNN
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1052 F 0 "#PWR024" H 8300 4700 50 0001 C CNN
1053 F 1 "GND" H 8305 4777 50 0000 C CNN
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1055 F 3 "" H 8300 4950 50 0001 C CNN
1060 L Connector:DB9_Male J2
1063 F 0 "J2" H 10800 5150 50 0000 L CNN
1064 F 1 "SERA" H 10750 4050 50 0000 L CNN
1065 F 2 "" H 10850 4600 50 0001 C CNN
1066 F 3 " ~" H 10850 4600 50 0001 C CNN
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1094 F 0 "#PWR028" H 10550 4800 50 0001 C CNN
1095 F 1 "GND" H 10555 4877 50 0000 C CNN
1096 F 2 "" H 10550 5050 50 0001 C CNN
1097 F 3 "" H 10550 5050 50 0001 C CNN
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1135 F 3 "~" H 850 4050 50 0001 C CNN
1139 Text Label 1150 3150 0 50 ~ 0
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1151 F 2 "" H 700 3350 50 0001 C CNN
1152 F 3 "" H 700 3350 50 0001 C CNN
1160 F 0 "R2" V 950 3550 50 0000 L CNN
1161 F 1 "4.7k" V 850 3450 50 0000 L CNN
1162 F 2 "" V 780 3550 50 0001 C CNN
1163 F 3 "~" H 850 3550 50 0001 C CNN
1169 Connection ~ 700 3550
1176 F 0 "C2" H 1900 7250 50 0000 L CNN
1177 F 1 "0.1uF" H 1900 7050 50 0000 L CNN
1178 F 2 "" H 1888 7000 50 0001 C CNN
1179 F 3 "~" H 1850 7150 50 0001 C CNN
1187 F 0 "C3" H 2200 7250 50 0000 L CNN
1188 F 1 "0.1uF" H 2200 7050 50 0000 L CNN
1189 F 2 "" H 2188 7000 50 0001 C CNN
1190 F 3 "~" H 2150 7150 50 0001 C CNN
1198 F 0 "C4" H 2500 7250 50 0000 L CNN
1199 F 1 "0.1uF" H 2500 7050 50 0000 L CNN
1200 F 2 "" H 2488 7000 50 0001 C CNN
1201 F 3 "~" H 2450 7150 50 0001 C CNN
1209 F 0 "C6" H 2800 7250 50 0000 L CNN
1210 F 1 "0.1uF" H 2800 7050 50 0000 L CNN
1211 F 2 "" H 2788 7000 50 0001 C CNN
1212 F 3 "~" H 2750 7150 50 0001 C CNN
1220 F 0 "C7" H 3100 7250 50 0000 L CNN
1221 F 1 "0.1uF" H 3100 7050 50 0000 L CNN
1222 F 2 "" H 3088 7000 50 0001 C CNN
1223 F 3 "~" H 3050 7150 50 0001 C CNN
1231 F 0 "C8" H 3400 7250 50 0000 L CNN
1232 F 1 "0.1uF" H 3400 7050 50 0000 L CNN
1233 F 2 "" H 3388 7000 50 0001 C CNN
1234 F 3 "~" H 3350 7150 50 0001 C CNN
1242 F 0 "#PWR010" H 2600 7050 50 0001 C CNN
1243 F 1 "GND" H 2605 7127 50 0000 C CNN
1244 F 2 "" H 2600 7300 50 0001 C CNN
1245 F 3 "" H 2600 7300 50 0001 C CNN
1253 F 0 "#PWR09" H 2600 6850 50 0001 C CNN
1254 F 1 "VCC" H 2600 7150 50 0000 C CNN
1255 F 2 "" H 2600 7000 50 0001 C CNN
1256 F 3 "" H 2600 7000 50 0001 C CNN
1262 Connection ~ 2150 7000
1265 Connection ~ 2450 7000
1268 Connection ~ 2600 7000
1271 Connection ~ 2750 7000
1274 Connection ~ 3050 7000
1279 Connection ~ 2150 7300
1282 Connection ~ 2450 7300
1285 Connection ~ 2600 7300
1288 Connection ~ 2750 7300
1291 Connection ~ 3050 7300
1298 F 0 "R1" V 950 3450 50 0000 L CNN
1299 F 1 "4.7k" V 850 3350 50 0000 L CNN
1300 F 2 "" V 780 3450 50 0001 C CNN
1301 F 3 "~" H 850 3450 50 0001 C CNN
1305 Connection ~ 700 3450
1310 Text Label 1050 3450 0 50 ~ 0
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1317 F 1 "74LS05" H 7400 6350 50 0000 C CNN
1318 F 2 "" H 7300 6200 50 0001 C CNN
1319 F 3 "http://www.ti.com/lit/gpn/sn74LS05" H 7300 6200 50 0001 C CNN
1327 F 0 "D1" H 8050 5984 50 0000 C CNN
1328 F 1 "1N4148" H 8050 6075 50 0000 C CNN
1329 F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 8050 6025 50 0001 C CNN
1330 F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 8050 6200 50 0001 C CNN
1338 F 0 "R8" H 7680 6004 50 0000 R CNN
1339 F 1 "4k7" H 7680 6095 50 0000 R CNN
1340 F 2 "" V 7680 6050 50 0001 C CNN
1341 F 3 "~" H 7750 6050 50 0001 C CNN
1349 F 0 "#PWR023" H 7750 5750 50 0001 C CNN
1350 F 1 "VCC" H 7767 6073 50 0000 C CNN
1351 F 2 "" H 7750 5900 50 0001 C CNN
1352 F 3 "" H 7750 5900 50 0001 C CNN
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1361 Text Label 8200 6200 0 50 ~ 0
1365 Connection ~ 7750 6200
1376 Connection ~ 1000 4050
1379 Text Label 4400 1200 0 50 ~ 0
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1393 F 0 "#PWR04" H 1300 5000 50 0001 C CNN
1394 F 1 "VCC" H 1317 5323 50 0000 C CNN
1395 F 2 "" H 1300 5150 50 0001 C CNN
1396 F 3 "" H 1300 5150 50 0001 C CNN
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1421 F 1 "74HC14" H 850 2250 50 0000 L CNN
1422 F 2 "" H 850 2400 50 0001 C CNN
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1442 F 1 "VCC" H 1300 1800 50 0000 C CNN
1443 F 2 "" H 1300 1650 50 0001 C CNN
1444 F 3 "" H 1300 1650 50 0001 C CNN
1454 F 0 "#PWR02" H 750 1100 50 0001 C CNN
1455 F 1 "GND" H 755 1177 50 0000 C CNN
1456 F 2 "" H 750 1350 50 0001 C CNN
1457 F 3 "" H 750 1350 50 0001 C CNN
1461 Connection ~ 1200 1250
1465 L Switch:SW_Push SW1
1468 F 0 "SW1" H 950 1535 50 0000 C CNN
1469 F 1 "RESET" H 950 1444 50 0000 C CNN
1470 F 2 "" H 950 1450 50 0001 C CNN
1471 F 3 "~" H 950 1450 50 0001 C CNN
1475 Connection ~ 1850 1050
1488 F 0 "R5" H 1270 1146 50 0000 L CNN
1489 F 1 "1M" V 1200 1050 50 0000 L CNN
1490 F 2 "" V 1130 1100 50 0001 C CNN
1491 F 3 "~" H 1200 1100 50 0001 C CNN
1500 F 0 "#PWR011" H 2700 1000 50 0001 C CNN
1501 F 1 "VCC" H 2717 1323 50 0000 C CNN
1502 F 2 "" H 2700 1150 50 0001 C CNN
1503 F 3 "" H 2700 1150 50 0001 C CNN
1507 Text Label 2350 1250 0 50 ~ 0
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1522 F 0 "C5" H 2609 1704 50 0000 R CNN
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1525 F 3 "~" H 2700 1750 50 0001 C CNN
1535 F 0 "R6" H 2750 1350 50 0000 L CNN
1536 F 1 "9.1k" V 2700 1200 50 0000 L CNN
1537 F 2 "" V 2630 1300 50 0001 C CNN
1538 F 3 "~" H 2700 1300 50 0001 C CNN
1546 F 0 "#PWR05" H 1850 900 50 0001 C CNN
1547 F 1 "VCC" H 1867 1223 50 0000 C CNN
1548 F 2 "" H 1850 1050 50 0001 C CNN
1549 F 3 "" H 1850 1050 50 0001 C CNN
1557 F 0 "#PWR06" H 1850 1600 50 0001 C CNN
1558 F 1 "GND" H 1855 1677 50 0000 C CNN
1559 F 2 "" H 1850 1850 50 0001 C CNN
1560 F 3 "" H 1850 1850 50 0001 C CNN
1568 F 0 "U2" H 2000 1800 50 0000 C CNN
1569 F 1 "LM555" H 1850 1450 50 0000 C CNN
1570 F 2 "" H 1850 1450 50 0001 C CNN
1571 F 3 "http://www.ti.com/lit/ds/symlink/lm555.pdf" H 1850 1450 50 0001 C CNN
1579 F 0 "U4" H 2450 650 50 0000 C CNN
1580 F 1 "74LS05" H 2550 950 50 0000 C CNN
1581 F 2 "" H 2450 800 50 0001 C CNN
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1601 F 3 "~" H 1050 2700 50 0001 C CNN
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1615 Connection ~ 1850 1850
1620 F 0 "C1" H 1109 1654 50 0000 R CNN
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1623 F 3 "~" H 1200 1700 50 0001 C CNN
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1655 Text Label 3200 2000 0 50 ~ 0
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1666 F 3 "http://www.ti.com/lit/gpn/sn74HC14" H 5600 1300 50 0001 C CNN
1674 F 0 "C9" H 5008 1054 50 0000 R CNN
1675 F 1 "0.1uF" H 5008 1145 50 0000 R CNN
1676 F 2 "" H 5100 1100 50 0001 C CNN
1677 F 3 "~" H 5100 1100 50 0001 C CNN
1685 F 0 "R7" V 4750 1250 50 0000 L CNN
1686 F 1 "120R" V 4850 1200 50 0000 L CNN
1687 F 2 "" V 4780 1300 50 0001 C CNN
1688 F 3 "~" H 4850 1300 50 0001 C CNN
1696 F 0 "#PWR018" H 5100 850 50 0001 C CNN
1697 F 1 "VCC" H 5117 1173 50 0000 C CNN
1698 F 2 "" H 5100 1000 50 0001 C CNN
1699 F 3 "" H 5100 1000 50 0001 C CNN
1707 F 0 "U1" H 6150 1450 50 0000 L CNN
1708 F 1 "74HC14" H 6150 1150 50 0000 L CNN
1709 F 2 "" H 6200 1300 50 0001 C CNN
1710 F 3 "http://www.ti.com/lit/gpn/sn74HC14" H 6200 1300 50 0001 C CNN
1736 Connection ~ 5100 1300
1739 Text Notes 5350 950 0 50 ~ 0
1740 Delay the UART ~CS~ for a few ns to bring the\ntiming between R/~W~ and ~CS~ within spec\n(this might have been a red herring and not necessary)