EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 1 1 Title "Z80 computer 2" Date "2020-04-29" Rev "" Comp "" Comment1 "License: Creative Commons Attribution Share-Alike (CC BY-SA)" Comment2 "Copyright (C) 2020 John Tsiombikas " Comment3 "" Comment4 "" $EndDescr $Comp L CPU:Z80CPU U3 U 1 1 5EA29512 P 2000 4050 F 0 "U3" H 2200 2650 50 0000 C CNN F 1 "Z80CPU" H 2000 4050 50 0000 C CNN F 2 "" H 2000 4450 50 0001 C CNN F 3 "www.zilog.com/manage_directlink.php?filepath=docs/z80/um0080" H 2000 4450 50 0001 C CNN 1 2000 4050 1 0 0 -1 $EndComp $Comp L Memory_EEPROM:28C256 U6 U 1 1 5EA2C09A P 3850 4400 F 0 "U6" H 4000 3350 50 0000 C CNN F 1 "28C256" V 3850 4400 50 0000 C CNN F 2 "" H 3850 4400 50 0001 C CNN F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/doc0006.pdf" H 3850 4400 50 0001 C CNN 1 3850 4400 1 0 0 -1 $EndComp $Comp L power:GND #PWR08 U 1 1 5EA2ECD7 P 2000 5550 F 0 "#PWR08" H 2000 5300 50 0001 C CNN F 1 "GND" H 2005 5377 50 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"C2" H 1900 7250 50 0000 L CNN F 1 "0.1uF" H 1900 7050 50 0000 L CNN F 2 "" H 1888 7000 50 0001 C CNN F 3 "~" H 1850 7150 50 0001 C CNN 1 1850 7150 1 0 0 -1 $EndComp $Comp L Device:C C3 U 1 1 5F444327 P 2150 7150 F 0 "C3" H 2200 7250 50 0000 L CNN F 1 "0.1uF" H 2200 7050 50 0000 L CNN F 2 "" H 2188 7000 50 0001 C CNN F 3 "~" H 2150 7150 50 0001 C CNN 1 2150 7150 1 0 0 -1 $EndComp $Comp L Device:C C4 U 1 1 5F444547 P 2450 7150 F 0 "C4" H 2500 7250 50 0000 L CNN F 1 "0.1uF" H 2500 7050 50 0000 L CNN F 2 "" H 2488 7000 50 0001 C CNN F 3 "~" H 2450 7150 50 0001 C CNN 1 2450 7150 1 0 0 -1 $EndComp $Comp L Device:C C6 U 1 1 5F444841 P 2750 7150 F 0 "C6" H 2800 7250 50 0000 L CNN F 1 "0.1uF" H 2800 7050 50 0000 L CNN F 2 "" H 2788 7000 50 0001 C CNN F 3 "~" H 2750 7150 50 0001 C CNN 1 2750 7150 1 0 0 -1 $EndComp $Comp L Device:C C7 U 1 1 5F444B0C P 3050 7150 F 0 "C7" H 3100 7250 50 0000 L CNN F 1 "0.1uF" H 3100 7050 50 0000 L CNN F 2 "" H 3088 7000 50 0001 C CNN F 3 "~" H 3050 7150 50 0001 C CNN 1 3050 7150 1 0 0 -1 $EndComp $Comp L Device:C C8 U 1 1 5F444DC1 P 3350 7150 F 0 "C8" H 3400 7250 50 0000 L CNN F 1 "0.1uF" H 3400 7050 50 0000 L CNN F 2 "" H 3388 7000 50 0001 C CNN F 3 "~" H 3350 7150 50 0001 C CNN 1 3350 7150 1 0 0 -1 $EndComp $Comp L power:GND #PWR010 U 1 1 5F4451AA P 2600 7300 F 0 "#PWR010" H 2600 7050 50 0001 C CNN F 1 "GND" H 2605 7127 50 0000 C CNN F 2 "" H 2600 7300 50 0001 C CNN F 3 "" H 2600 7300 50 0001 C CNN 1 2600 7300 1 0 0 -1 $EndComp $Comp L power:VCC #PWR09 U 1 1 5F4467BC P 2600 7000 F 0 "#PWR09" H 2600 6850 50 0001 C CNN F 1 "VCC" H 2600 7150 50 0000 C CNN F 2 "" H 2600 7000 50 0001 C CNN F 3 "" H 2600 7000 50 0001 C CNN 1 2600 7000 1 0 0 -1 $EndComp Wire Wire Line 1850 7000 2150 7000 Connection ~ 2150 7000 Wire Wire Line 2150 7000 2450 7000 Connection ~ 2450 7000 Wire Wire Line 2450 7000 2600 7000 Connection ~ 2600 7000 Wire Wire Line 2600 7000 2750 7000 Connection ~ 2750 7000 Wire Wire Line 2750 7000 3050 7000 Connection ~ 3050 7000 Wire Wire Line 3050 7000 3350 7000 Wire Wire Line 1850 7300 2150 7300 Connection ~ 2150 7300 Wire Wire Line 2150 7300 2450 7300 Connection ~ 2450 7300 Wire Wire Line 2450 7300 2600 7300 Connection ~ 2600 7300 Wire Wire Line 2600 7300 2750 7300 Connection ~ 2750 7300 Wire Wire Line 2750 7300 3050 7300 Connection ~ 3050 7300 Wire Wire Line 3050 7300 3350 7300 $Comp L Device:R R1 U 1 1 5F463EA2 P 850 3450 F 0 "R1" V 950 3450 50 0000 L CNN F 1 "4.7k" V 850 3350 50 0000 L CNN F 2 "" V 780 3450 50 0001 C CNN F 3 "~" H 850 3450 50 0001 C CNN 1 850 3450 0 -1 -1 0 $EndComp Connection ~ 700 3450 Wire Wire Line 700 3450 700 3550 Wire Wire Line 1000 3450 1300 3450 Text Label 1050 3450 0 50 ~ 0 ~NMI $Comp L 74xx:74LS05 U4 U 2 1 5F4A99C1 P 7300 6200 F 0 "U4" H 7300 6050 50 0000 C CNN F 1 "74LS05" H 7400 6350 50 0000 C CNN F 2 "" H 7300 6200 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS05" H 7300 6200 50 0001 C CNN 2 7300 6200 -1 0 0 1 $EndComp $Comp L Diode:1N4148 D1 U 1 1 5F4AD646 P 8050 6200 F 0 "D1" H 8050 5984 50 0000 C CNN F 1 "1N4148" H 8050 6075 50 0000 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 8050 6025 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 8050 6200 50 0001 C CNN 1 8050 6200 -1 0 0 1 $EndComp $Comp L Device:R R8 U 1 1 5F4AE323 P 7750 6050 F 0 "R8" H 7680 6004 50 0000 R CNN F 1 "4k7" H 7680 6095 50 0000 R CNN F 2 "" V 7680 6050 50 0001 C CNN F 3 "~" H 7750 6050 50 0001 C CNN 1 7750 6050 1 0 0 1 $EndComp $Comp L power:VCC #PWR023 U 1 1 5F4B4193 P 7750 5900 F 0 "#PWR023" H 7750 5750 50 0001 C CNN F 1 "VCC" H 7767 6073 50 0000 C CNN F 2 "" H 7750 5900 50 0001 C CNN F 3 "" H 7750 5900 50 0001 C CNN 1 7750 5900 1 0 0 -1 $EndComp Wire Wire Line 7900 5250 7900 6200 Connection ~ 7900 6200 Wire Wire Line 8200 6200 8500 6200 Text Label 8200 6200 0 50 ~ 0 UARTEN Wire Wire Line 7600 6200 7750 6200 Connection ~ 7750 6200 Wire Wire Line 7750 6200 7900 6200 Wire Wire Line 7000 6200 850 6200 Wire Wire Line 850 6200 850 4250 Wire Wire Line 850 4250 1000 4250 Wire Wire Line 1000 4250 1000 4050 Connection ~ 1000 4050 Wire Wire Line 4400 1200 4700 1200 Text Label 4400 1200 0 50 ~ 0 UARTEN Wire Wire Line 7900 5150 8050 5150 Text Label 7900 5150 0 50 ~ 0 ~INT Wire Wire Line 8300 4950 8350 4950 Text Notes 3950 2300 0 50 ~ 0 GAL16V8: glue.pld $Comp L power:VCC #PWR04 U 1 1 5F6A583C P 1300 5150 F 0 "#PWR04" H 1300 5000 50 0001 C CNN F 1 "VCC" H 1317 5323 50 0000 C CNN F 2 "" H 1300 5150 50 0001 C CNN F 3 "" H 1300 5150 50 0001 C CNN 1 1300 5150 1 0 0 -1 $EndComp Wire Wire Line 3300 1600 3100 1600 Text Label 3200 1600 0 50 ~ 0 ~M1 Wire Wire Line 3300 1900 3100 1900 Text Label 3100 1900 0 50 ~ 0 ~RFSH Wire Wire Line 4400 1700 4700 1700 Text Label 4400 1700 0 50 ~ 0 ~IACK Wire Wire Line 6800 4700 6600 4700 Text Label 6600 4700 0 50 ~ 0 ~IACK $Comp L 74xx:74HC14 U1 U 6 1 5F7B3414 P 850 2400 F 0 "U1" V 650 2400 50 0000 L CNN F 1 "74HC14" H 850 2250 50 0000 L CNN F 2 "" H 850 2400 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74HC14" H 850 2400 50 0001 C CNN 6 850 2400 0 1 1 0 $EndComp Wire Wire Line 850 2700 850 3150 Wire Wire Line 850 3150 1300 3150 Wire Wire Line 850 2100 850 1850 Text Label 850 2050 1 50 ~ 0 UCLK Wire Wire Line 1300 1650 1350 1650 $Comp L power:VCC #PWR03 U 1 1 5F97FBA6 P 1300 1650 F 0 "#PWR03" H 1300 1500 50 0001 C CNN F 1 "VCC" H 1300 1800 50 0000 C CNN F 2 "" H 1300 1650 50 0001 C CNN F 3 "" H 1300 1650 50 0001 C CNN 1 1300 1650 1 0 0 -1 $EndComp Wire Wire Line 750 1350 750 1250 $Comp L power:GND #PWR02 U 1 1 5F96EC3C P 750 1350 F 0 "#PWR02" H 750 1100 50 0001 C CNN F 1 "GND" H 755 1177 50 0000 C CNN F 2 "" H 750 1350 50 0001 C CNN F 3 "" H 750 1350 50 0001 C CNN 1 750 1350 1 0 0 -1 $EndComp Connection ~ 1200 1250 Wire Wire Line 1150 1250 1200 1250 $Comp L Switch:SW_Push SW1 U 1 1 5F933400 P 950 1250 F 0 "SW1" H 950 1535 50 0000 C CNN F 1 "RESET" H 950 1444 50 0000 C CNN F 2 "" H 950 1450 50 0001 C CNN F 3 "~" H 950 1450 50 0001 C CNN 1 950 1250 1 0 0 -1 $EndComp Connection ~ 1850 1050 Wire Wire Line 1500 1050 1850 1050 Wire Wire Line 1500 950 1500 1050 Wire Wire Line 1200 950 1500 950 Wire Wire Line 1200 1250 1350 1250 $Comp L Device:R R5 U 1 1 5F901EA0 P 1200 1100 F 0 "R5" H 1270 1146 50 0000 L CNN F 1 "1M" V 1200 1050 50 0000 L CNN F 2 "" V 1130 1100 50 0001 C CNN F 3 "~" H 1200 1100 50 0001 C CNN 1 1200 1100 1 0 0 -1 $EndComp NoConn ~ 1350 1450 $Comp L power:VCC #PWR011 U 1 1 5F8CF8A4 P 2700 1150 F 0 "#PWR011" H 2700 1000 50 0001 C CNN F 1 "VCC" H 2717 1323 50 0000 C CNN F 2 "" H 2700 1150 50 0001 C CNN F 3 "" H 2700 1150 50 0001 C CNN 1 2700 1150 1 0 0 -1 $EndComp Text Label 2350 1250 0 50 ~ 0 RST Wire Wire Line 2350 1250 2550 1250 Wire Wire Line 2700 1850 1850 1850 Wire Wire Line 2350 1650 2700 1650 Connection ~ 2700 1450 Wire Wire Line 2700 1450 2700 1650 $Comp L Device:C_Small C5 U 1 1 5F880397 P 2700 1750 F 0 "C5" H 2609 1704 50 0000 R CNN F 1 "0.1uF" H 2609 1795 50 0000 R CNN F 2 "" H 2700 1750 50 0001 C CNN F 3 "~" H 2700 1750 50 0001 C CNN 1 2700 1750 1 0 0 1 $EndComp Wire Wire Line 2350 1450 2700 1450 $Comp L Device:R R6 U 1 1 5F8611FE P 2700 1300 F 0 "R6" H 2750 1350 50 0000 L CNN F 1 "9.1k" V 2700 1200 50 0000 L CNN F 2 "" V 2630 1300 50 0001 C CNN F 3 "~" H 2700 1300 50 0001 C CNN 1 2700 1300 1 0 0 -1 $EndComp $Comp L power:VCC #PWR05 U 1 1 5F860836 P 1850 1050 F 0 "#PWR05" H 1850 900 50 0001 C CNN F 1 "VCC" H 1867 1223 50 0000 C CNN F 2 "" H 1850 1050 50 0001 C CNN F 3 "" H 1850 1050 50 0001 C CNN 1 1850 1050 1 0 0 -1 $EndComp $Comp L power:GND #PWR06 U 1 1 5F860553 P 1850 1850 F 0 "#PWR06" H 1850 1600 50 0001 C CNN F 1 "GND" H 1855 1677 50 0000 C CNN F 2 "" H 1850 1850 50 0001 C CNN F 3 "" H 1850 1850 50 0001 C CNN 1 1850 1850 1 0 0 -1 $EndComp $Comp L Timer:LM555 U2 U 1 1 5F85DCB5 P 1850 1450 F 0 "U2" H 2000 1800 50 0000 C CNN F 1 "LM555" H 1850 1450 50 0000 C CNN F 2 "" H 1850 1450 50 0001 C CNN F 3 "http://www.ti.com/lit/ds/symlink/lm555.pdf" H 1850 1450 50 0001 C CNN 1 1850 1450 1 0 0 -1 $EndComp $Comp L 74xx:74LS05 U4 U 1 1 5F9CB042 P 2450 800 F 0 "U4" H 2450 650 50 0000 C CNN F 1 "74LS05" H 2550 950 50 0000 C CNN F 2 "" H 2450 800 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS05" H 2450 800 50 0001 C CNN 1 2450 800 1 0 0 -1 $EndComp Wire Wire Line 2150 800 2150 1050 Wire Wire Line 2150 1050 2550 1050 Wire Wire Line 2550 1050 2550 1250 Text Label 2850 800 0 50 ~ 0 ~RST $Comp L Device:R R4 U 1 1 5FA0761C P 1050 2700 F 0 "R4" H 1120 2746 50 0000 L CNN F 1 "4.7k" V 1050 2600 50 0000 L CNN F 2 "" V 980 2700 50 0001 C CNN F 3 "~" H 1050 2700 50 0001 C CNN 1 1050 2700 1 0 0 -1 $EndComp Text Notes 1350 700 0 50 ~ 0 Power-on reset Wire Wire Line 2750 800 3000 800 Wire Wire Line 1050 2850 1300 2850 Wire Wire Line 1050 2550 2000 2550 Connection ~ 2000 2550 Connection ~ 2700 1650 Connection ~ 1850 1850 $Comp L Device:C_Small C1 U 1 1 5FC80F1C P 1200 1700 F 0 "C1" H 1109 1654 50 0000 R CNN F 1 "0.1uF" H 1109 1745 50 0000 R CNN F 2 "" H 1200 1700 50 0001 C CNN F 3 "~" H 1200 1700 50 0001 C CNN 1 1200 1700 1 0 0 1 $EndComp Wire Wire Line 1200 1800 1200 1850 Wire Wire Line 1200 1850 1850 1850 Wire Wire Line 1200 1600 1200 1250 NoConn ~ 1300 5250 NoConn ~ 1300 4150 Wire Wire Line 1300 3850 1100 3850 Text Label 1200 3850 0 50 ~ 0 ~M1 Wire Wire Line 1300 3950 1100 3950 Text Label 1100 3950 0 50 ~ 0 ~RFSH Connection ~ 4700 2600 Wire Bus Line 4600 2600 4700 2600 Wire Bus Line 4700 2600 6350 2600 Wire Bus Line 3150 2600 4700 2600 Connection ~ 3000 2600 Wire Wire Line 3300 2000 3100 2000 Wire Wire Line 3300 2100 3100 2100 Text Label 3200 2000 0 50 ~ 0 ~RD Text Label 3200 2100 0 50 ~ 0 ~WR $Comp L 74xx:74HC14 U1 U 5 1 5FEF66B9 P 5600 1300 F 0 "U1" H 5550 1450 50 0000 L CNN F 1 "74HC14" H 5550 1150 50 0000 L CNN F 2 "" H 5600 1300 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74HC14" H 5600 1300 50 0001 C CNN 5 5600 1300 1 0 0 -1 $EndComp $Comp L Device:C_Small C9 U 1 1 5FEF828C P 5100 1100 F 0 "C9" H 5008 1054 50 0000 R CNN F 1 "0.1uF" H 5008 1145 50 0000 R CNN F 2 "" H 5100 1100 50 0001 C CNN F 3 "~" H 5100 1100 50 0001 C CNN 1 5100 1100 -1 0 0 1 $EndComp $Comp L Device:R R7 U 1 1 5FF0FBDF P 4850 1300 F 0 "R7" V 4750 1250 50 0000 L CNN F 1 "120R" V 4850 1200 50 0000 L CNN F 2 "" V 4780 1300 50 0001 C CNN F 3 "~" H 4850 1300 50 0001 C CNN 1 4850 1300 0 1 1 0 $EndComp $Comp L power:VCC #PWR018 U 1 1 5FF26567 P 5100 1000 F 0 "#PWR018" H 5100 850 50 0001 C CNN F 1 "VCC" H 5117 1173 50 0000 C CNN F 2 "" H 5100 1000 50 0001 C CNN F 3 "" H 5100 1000 50 0001 C CNN 1 5100 1000 1 0 0 -1 $EndComp $Comp L 74xx:74HC14 U1 U 4 1 5FF485F0 P 6200 1300 F 0 "U1" H 6150 1450 50 0000 L CNN F 1 "74HC14" H 6150 1150 50 0000 L CNN F 2 "" H 6200 1300 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74HC14" H 6200 1300 50 0001 C CNN 4 6200 1300 1 0 0 -1 $EndComp Wire Wire Line 6500 1300 6800 1300 Wire Wire Line 5000 1300 5100 1300 Wire Wire Line 5100 1200 5100 1300 Wire Bus Line 6350 2600 6350 3200 Wire Bus Line 3000 1100 3000 2600 Wire Bus Line 6400 3400 6400 4400 Wire Bus Line 4550 3600 4550 5850 Wire Bus Line 3000 4650 3000 5850 Wire Bus Line 3150 2600 3150 4800 Wire Bus Line 4700 2600 4700 4600 Wire Bus Line 3000 2600 3000 4250 Connection ~ 5100 1300 Wire Wire Line 5100 1300 5300 1300 Text Notes 5350 950 0 50 ~ 0 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) $EndSCHEMATC