Apple-2-HW/Apple2-IO-RPi
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Apple2-IO-RPi/Hardware/Apple2IORPi.sch

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Add ground wires to EPROM address lines
2020-12-13 05:43:19 +00:00
EESchema Schematic File Version 4
LIBS:Apple2IORPi-cache
EELAYER 26 0
EELAYER END
$Descr USLedger 17000 11000
encoding utf-8
Sheet 1 1
Title "Apple II I/O RPi"
Update schematic/PCB to work with more EPROM types
2020-12-14 03:19:04 +00:00
Date "2020-12-13"
Rev "0.6"
Add ground wires to EPROM address lines
2020-12-13 05:43:19 +00:00
Comp "Terence J. Boldt"
Comment1 "Initial draft desgn"
Comment2 "Provides storage and network for the Apple ]["
Comment3 "Raspberry Pi Zero W as a daughter board"
Comment4 "Expansion card for Apple ][ computers"
$EndDescr
$Comp
L Connector_Generic:Conn_02x25_Counter_Clockwise J0
U 1 1 5FA0A8C3
P 3300 4100
F 0 "J0" H 3350 5517 50 0000 C CNN
F 1 "Apple II Expansion Bus" H 3350 5426 50 0000 C CNN
F 2 "Apple2:Apple II Expansion Edge Connector" H 3300 4100 50 0001 C CNN
F 3 "~" H 3300 4100 50 0001 C CNN
1 3300 4100
1 0 0 -1
$EndComp
$Comp
L 74xx:74LS245 U0
U 1 1 5FA15F43
P 5150 3500
F 0 "U0" H 5150 4481 50 0000 C CNN
F 1 "74LS245" H 5150 4390 50 0000 C CNN
F 2 "Package_DIP:DIP-20_W7.62mm" H 5150 3500 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS245" H 5150 3500 50 0001 C CNN
1 5150 3500
1 0 0 -1
$EndComp
$Comp
L 74xx:74LS245 U4
U 1 1 5FA19168
P 9400 3500
F 0 "U4" H 9400 4481 50 0000 C CNN
F 1 "74LVC245" H 9400 4390 50 0000 C CNN
F 2 "Package_DIP:DIP-20_W7.62mm" H 9400 3500 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS245" H 9400 3500 50 0001 C CNN
1 9400 3500
1 0 0 -1
$EndComp
$Comp
L Connector:Raspberry_Pi_2_3 J1
U 1 1 5FA19C2C
P 13350 3950
F 0 "J1" H 13350 5431 50 0000 C CNN
F 1 "Raspberry_Pi_2_3" H 13350 5340 50 0000 C CNN
F 2 "Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical" H 13350 3950 50 0001 C CNN
F 3 "https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_3bplus_1p0_reduced.pdf" H 13350 3950 50 0001 C CNN
1 13350 3950
1 0 0 -1
$EndComp
$Comp
L 74xx:74LS374 U5
U 1 1 5FA1EB22
P 9400 5500
F 0 "U5" H 9400 6481 50 0000 C CNN
F 1 "74LVC374" H 9400 6390 50 0000 C CNN
F 2 "Package_DIP:DIP-20_W7.62mm" H 9400 5500 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS374" H 9400 5500 50 0001 C CNN
1 9400 5500
1 0 0 -1
$EndComp
Wire Wire Line
4650 3000 3600 3000
Wire Wire Line
4650 3100 3600 3100
Wire Wire Line
4650 3200 3600 3200
Wire Wire Line
3600 3300 4650 3300
Wire Wire Line
4650 3400 3600 3400
Wire Wire Line
3600 3500 4650 3500
Wire Wire Line
4650 3600 3600 3600
Wire Wire Line
3600 3700 4650 3700
Wire Wire Line
5650 3000 6650 3000
Wire Wire Line
5650 3100 6700 3100
Wire Wire Line
8900 3200 8300 3200
Wire Wire Line
5650 3300 6800 3300
Wire Wire Line
5650 3400 6850 3400
Wire Wire Line
8900 3500 8150 3500
Wire Wire Line
5650 3600 6950 3600
Wire Wire Line
8900 3700 8050 3700
Wire Wire Line
8400 3000 8400 5000
Wire Wire Line
8400 5000 8900 5000
Connection ~ 8400 3000
Wire Wire Line
8400 3000 8900 3000
Wire Wire Line
8350 3100 8350 5100
Wire Wire Line
8350 5100 8900 5100
Connection ~ 8350 3100
Wire Wire Line
8350 3100 8900 3100
Wire Wire Line
8300 3200 8300 5200
Wire Wire Line
8300 5200 8900 5200
Connection ~ 8300 3200
Wire Wire Line
8300 3200 6750 3200
Wire Wire Line
8250 3300 8250 5300
Wire Wire Line
8250 5300 8900 5300
Connection ~ 8250 3300
Wire Wire Line
8250 3300 8900 3300
Wire Wire Line
8200 3400 8200 5400
Wire Wire Line
8200 5400 8900 5400
Connection ~ 8200 3400
Wire Wire Line
8200 3400 8900 3400
Wire Wire Line
8150 3500 8150 5500
Wire Wire Line
8150 5500 8900 5500
Connection ~ 8150 3500
Wire Wire Line
8150 3500 6900 3500
Wire Wire Line
8100 3600 8100 5600
Wire Wire Line
8100 5600 8900 5600
Connection ~ 8100 3600
Wire Wire Line
8100 3600 8900 3600
Wire Wire Line
8050 3700 8050 5700
Wire Wire Line
8050 5700 8900 5700
Connection ~ 8050 3700
Wire Wire Line
8050 3700 7000 3700
Wire Wire Line
6650 7000 6650 3000
Connection ~ 6650 3000
Wire Wire Line
6650 3000 8400 3000
Wire Wire Line
6700 3100 6700 7100
Wire Wire Line
6700 7100 6650 7100
Connection ~ 6700 3100
Wire Wire Line
6700 3100 8350 3100
Wire Wire Line
6750 7200 6650 7200
Wire Wire Line
6750 3200 6750 7200
Connection ~ 6750 3200
Wire Wire Line
6750 3200 5650 3200
Wire Wire Line
6800 3300 6800 7300
Wire Wire Line
6800 7300 6650 7300
Connection ~ 6800 3300
Wire Wire Line
6800 3300 8250 3300
Wire Wire Line
6650 7400 6850 7400
Wire Wire Line
6850 7400 6850 3400
Connection ~ 6850 3400
Wire Wire Line
6850 3400 8200 3400
Wire Wire Line
6900 3500 6900 7500
Wire Wire Line
6900 7500 6650 7500
Connection ~ 6900 3500
Wire Wire Line
6900 3500 5650 3500
Wire Wire Line
6650 7600 6950 7600
Wire Wire Line
6950 7600 6950 3600
Connection ~ 6950 3600
Wire Wire Line
6950 3600 8100 3600
Wire Wire Line
7000 3700 7000 7700
Wire Wire Line
7000 7700 6650 7700
Connection ~ 7000 3700
Wire Wire Line
7000 3700 5650 3700
Wire Wire Line
5850 7000 2950 7000
Wire Wire Line
2950 7000 2950 5950
Wire Wire Line
2950 3000 3100 3000
Wire Wire Line
3100 3100 2900 3100
Wire Wire Line
2900 3100 2900 6450
Wire Wire Line
2900 7100 5850 7100
Wire Wire Line
5850 7200 2850 7200
Wire Wire Line
2850 7200 2850 3200
Wire Wire Line
2850 3200 3100 3200
Wire Wire Line
3100 3300 2800 3300
Wire Wire Line
2800 3300 2800 7300
Wire Wire Line
2800 7300 5850 7300
Wire Wire Line
3100 3400 2750 3400
Wire Wire Line
2750 3400 2750 7400
Wire Wire Line
2750 7400 5850 7400
Wire Wire Line
5850 7500 2700 7500
Wire Wire Line
2700 7500 2700 3500
Wire Wire Line
2700 3500 3100 3500
Wire Wire Line
3100 3600 2650 3600
Wire Wire Line
2650 3600 2650 7600
Wire Wire Line
2650 7600 5850 7600
Wire Wire Line
5850 7700 2600 7700
Wire Wire Line
2600 7700 2600 3700
Wire Wire Line
2600 3700 3100 3700
Wire Wire Line
5850 7800 2550 7800
Wire Wire Line
2550 7800 2550 3800
Wire Wire Line
2550 3800 3100 3800
Wire Wire Line
3100 3900 2500 3900
Wire Wire Line
2500 3900 2500 7900
Wire Wire Line
2500 7900 5850 7900
Wire Wire Line
5850 8000 2450 8000
Wire Wire Line
2450 8000 2450 4000
Wire Wire Line
2450 4000 3100 4000
Wire Wire Line
3100 2900 3000 2900
Wire Wire Line
3000 2900 3000 5500
Wire Wire Line
Update schematic/PCB to work with more EPROM types
2020-12-14 03:19:04 +00:00
3000 8600 5650 8600
Add ground wires to EPROM address lines
2020-12-13 05:43:19 +00:00
Wire Wire Line
Update schematic/PCB to work with more EPROM types
2020-12-14 03:19:04 +00:00
5700 8400 5700 8300
Add ground wires to EPROM address lines
2020-12-13 05:43:19 +00:00
Wire Wire Line
5700 6800 6250 6800
Wire Wire Line
3100 5300 3100 6800
Wire Wire Line
3100 6800 5700 6800
Connection ~ 5700 6800
Wire Wire Line
5700 2700 7700 2700
Wire Wire Line
5700 2700 5700 3850
Wire Wire Line
8600 6300 9400 6300
Wire Wire Line
8600 6300 8600 6000
Wire Wire Line
8600 4300 9400 4300
Connection ~ 8600 6300
Wire Wire Line
8900 3900 8600 3900
Wire Wire Line
8600 3900 8600 4300
Connection ~ 8600 4300
Wire Wire Line
8900 6000 8600 6000
Connection ~ 8600 6000
Wire Wire Line
8600 6000 8600 4300
Wire Wire Line
13250 2650 13150 2650
Connection ~ 13150 2650
Wire Wire Line
9400 4300 9900 4300
Wire Wire Line
10950 4300 10950 5250
Wire Wire Line
10950 5250 12950 5250
Connection ~ 9400 4300
Wire Wire Line
12950 5250 13050 5250
Connection ~ 12950 5250
Wire Wire Line
13050 5250 13150 5250
Connection ~ 13050 5250
Wire Wire Line
13150 5250 13250 5250
Connection ~ 13150 5250
Wire Wire Line
13250 5250 13350 5250
Connection ~ 13250 5250
Wire Wire Line
13350 5250 13450 5250
Connection ~ 13350 5250
Wire Wire Line
13450 5250 13550 5250
Connection ~ 13450 5250
Wire Wire Line
13550 5250 13650 5250
Connection ~ 13550 5250
Connection ~ 3600 5300
Wire Wire Line
14150 3650 14400 3650
Wire Wire Line
14400 3650 14400 2500
Wire Wire Line
14400 2500 9900 2500
Wire Wire Line
9900 2500 9900 3000
Wire Wire Line
11000 3450 11000 3100
Wire Wire Line
12550 4650 11050 4650
Wire Wire Line
11050 4650 11050 3200
Wire Wire Line
11050 3200 9900 3200
Wire Wire Line
12550 4150 11100 4150
Wire Wire Line
11100 4150 11100 3300
Wire Wire Line
11100 3300 9900 3300
Wire Wire Line
12550 3450 11000 3450
Wire Wire Line
14150 4350 14450 4350
Wire Wire Line
14450 4350 14450 2300
Wire Wire Line
14450 2300 10050 2300
Wire Wire Line
10050 2300 10050 3400
Wire Wire Line
10050 3400 9900 3400
Wire Wire Line
14150 4250 14500 4250
Wire Wire Line
14500 4250 14500 2250
Wire Wire Line
14500 2250 10100 2250
Wire Wire Line
10100 2250 10100 3500
Wire Wire Line
10100 3500 9900 3500
Wire Wire Line
14150 4450 14550 4450
Wire Wire Line
14550 4450 14550 2200
Wire Wire Line
14550 2200 10150 2200
Wire Wire Line
10150 2200 10150 3600
Wire Wire Line
10150 3600 9900 3600
Wire Wire Line
14150 3750 14600 3750
Wire Wire Line
14600 3750 14600 2150
Wire Wire Line
14600 2150 10200 2150
Wire Wire Line
10200 2150 10200 3700
Wire Wire Line
10200 3700 9900 3700
Wire Wire Line
14150 3850 14600 3850
Wire Wire Line
14600 3850 14600 5400
Wire Wire Line
14600 5400 10800 5400
Wire Wire Line
10800 5400 10800 5000
Wire Wire Line
10750 5100 10750 5450
Wire Wire Line
10750 5450 14300 5450
Wire Wire Line
14300 5450 14300 4750
Wire Wire Line
14300 4750 14150 4750
Wire Wire Line
11150 3750 11150 5200
Wire Wire Line
11150 3750 12550 3750
Wire Wire Line
12550 4550 11200 4550
Wire Wire Line
11200 4550 11200 5300
Wire Wire Line
10700 3950 12550 3950
Wire Wire Line
10700 3950 10700 5400
Wire Wire Line
12550 3850 10650 3850
Wire Wire Line
10650 3850 10650 5500
Wire Wire Line
12550 3350 10600 3350
Wire Wire Line
10600 3350 10600 5600
Wire Wire Line
14150 4650 14350 4650
Wire Wire Line
14350 4650 14350 5700
Wire Wire Line
9400 4700 9950 4700
Connection ~ 9400 6300
Text Notes 4700 8800 0 50 ~ 0
Enable Firmware EPROM\non IO_SELECT low
Wire Wire Line
3100 4600 2400 4600
Wire Wire Line
2400 4600 2400 5700
Wire Wire Line
5350 6350 5350 4550
Wire Wire Line
4550 3900 4650 3900
Text Notes 4000 3950 0 50 ~ 0
Direction is\nR/W Inverted
Wire Wire Line
2950 5950 4800 5950
Wire Wire Line
6200 4000 7300 4000
Connection ~ 2950 5950
Wire Wire Line
2950 5950 2950 3000
$Comp
L 74xx:74LS32 U3
U 1 1 5FB50A31
P 7600 4100
F 0 "U3" H 7600 4425 50 0000 C CNN
F 1 "74LS32" H 7600 4334 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 7600 4100 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 7600 4100 50 0001 C CNN
1 7600 4100
1 0 0 -1
$EndComp
Wire Wire Line
3600 3800 3900 3800
Wire Wire Line
3900 4500 7300 4500
Wire Wire Line
7300 4500 7300 4200
Wire Wire Line
8900 4100 8900 4000
$Comp
L 74xx:74LS32 U3
U 2 1 5FB9C73F
P 5100 5850
F 0 "U3" H 5100 6175 50 0000 C CNN
F 1 "74LS32" H 5100 6084 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 5100 5850 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 5100 5850 50 0001 C CNN
2 5100 5850
1 0 0 -1
$EndComp
Wire Wire Line
4550 5700 4800 5700
Wire Wire Line
4800 5700 4800 5750
Connection ~ 4550 5700
Wire Wire Line
5400 5850 6200 5850
Wire Wire Line
6200 5850 6200 4000
$Comp
L 74xx:74LS32 U3
U 3 1 5FBF09C5
P 7700 5900
F 0 "U3" H 7700 6225 50 0000 C CNN
F 1 "74LS32" H 7700 6134 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 7700 5900 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 7700 5900 50 0001 C CNN
3 7700 5900
1 0 0 -1
$EndComp
Wire Wire Line
7300 5800 7400 5800
Wire Wire Line
7300 4500 7300 5800
Connection ~ 7300 4500
$Comp
L 74xx:74LS32 U3
U 4 1 5FC54438
P 5100 6350
F 0 "U3" H 5100 6675 50 0000 C CNN
F 1 "74LS32" H 5100 6584 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 5100 6350 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 5100 6350 50 0001 C CNN
4 5100 6350
1 0 0 -1
$EndComp
Wire Wire Line
7400 6000 5400 6000
Wire Wire Line
5400 6000 5400 6350
Wire Wire Line
4800 6450 2900 6450
Connection ~ 2900 6450
Wire Wire Line
2900 6450 2900 7100
Text Notes 7900 6350 0 50 ~ 0
Latch Clock on\nR/W low\nA1 low\nDEV_SELECT low
Wire Wire Line
4700 6250 4800 6250
Wire Wire Line
4550 5700 4550 6050
Wire Wire Line
4550 6050 4100 6050
Wire Wire Line
4100 6050 4100 6150
Wire Wire Line
2400 5700 3950 5700
Wire Wire Line
3900 3800 3900 4500
$Comp
L 74xx:74LS00 U2
U 1 1 5FD4E618
P 4150 4900
F 0 "U2" H 4150 5225 50 0000 C CNN
F 1 "74LS00" H 4150 5134 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 4150 4900 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 4150 4900 50 0001 C CNN
1 4150 4900
1 0 0 -1
$EndComp
Wire Wire Line
3900 4500 3850 4500
Wire Wire Line
3850 4500 3850 4800
Connection ~ 3900 4500
$Comp
L 74xx:74LS00 U2
U 2 1 5FD74B7A
P 4950 4900
F 0 "U2" H 4950 5225 50 0000 C CNN
F 1 "74LS00" H 4950 5134 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 4950 4900 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 4950 4900 50 0001 C CNN
2 4950 4900
1 0 0 -1
$EndComp
Wire Wire Line
5450 5300 5450 4300
Wire Wire Line
5450 4300 5150 4300
Wire Wire Line
3600 5300 5450 5300
Wire Wire Line
4450 4900 4650 4900
Wire Wire Line
4650 4900 4650 4800
Wire Wire Line
4650 5000 4650 4900
Connection ~ 4650 4900
Wire Wire Line
5250 4900 5250 4350
Wire Wire Line
5250 4350 4650 4350
Wire Wire Line
4650 4350 4650 4000
Wire Wire Line
3000 5500 3850 5500
Wire Wire Line
3850 5500 3850 5000
Connection ~ 3000 5500
Wire Wire Line
3000 5500 3000 8600
$Comp
L 74xx:74LS00 U2
U 3 1 5FE27921
P 4400 6250
F 0 "U2" H 4400 6575 50 0000 C CNN
F 1 "74LS00" H 4400 6484 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 4400 6250 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 4400 6250 50 0001 C CNN
3 4400 6250
1 0 0 -1
$EndComp
Connection ~ 4100 6150
Wire Wire Line
4100 6150 4100 6350
$Comp
L 74xx:74LS00 U2
U 4 1 5FE48B46
P 4250 5700
F 0 "U2" H 4250 6025 50 0000 C CNN
F 1 "74LS00" H 4250 5934 50 0000 C CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 4250 5700 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 4250 5700 50 0001 C CNN
4 4250 5700
1 0 0 -1
$EndComp
Wire Wire Line
3950 5600 3950 5700
Wire Wire Line
3950 5700 3950 5800
Connection ~ 3950 5700
Text Notes 8800 4400 0 50 ~ 0
Enable on\nR/W high\nA0 low\nDEV_SELECT low
Text Notes 5250 5000 0 50 ~ 0
Enable on either\nDEV_SELECT low\nIO_SELECT low
$Comp
L 74xx:74LS00 U2
U 5 1 5FED8457
P 7550 7250
F 0 "U2" H 7780 7296 50 0000 L CNN
F 1 "74LS00" H 7780 7205 50 0000 L CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 7550 7250 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 7550 7250 50 0001 C CNN
5 7550 7250
1 0 0 -1
$EndComp
$Comp
L 74xx:74LS32 U3
U 5 1 5FEDB516
P 8300 7250
F 0 "U3" H 8530 7296 50 0000 L CNN
F 1 "74LS32" H 8530 7205 50 0000 L CNN
F 2 "Package_DIP:DIP-14_W7.62mm" H 8300 7250 50 0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 8300 7250 50 0001 C CNN
5 8300 7250
1 0 0 -1
$EndComp
Wire Wire Line
8300 7750 8600 7750
Connection ~ 8600 7750
Wire Wire Line
8600 7750 8600 6300
Wire Wire Line
8300 7750 8000 7750
Connection ~ 8300 7750
Wire Wire Line
8300 6750 8000 6750
Wire Wire Line
7550 6750 7200 6750
Wire Wire Line
6250 6750 6250 6800
Connection ~ 7550 6750
Wire Wire Line
3100 5200 3050 5200
Wire Wire Line
3050 5200 3050 5400
Wire Wire Line
3050 5400 3700 5400
Wire Wire Line
3700 5400 3700 5200
Wire Wire Line
3700 5200 3600 5200
Wire Wire Line
3600 5100 3750 5100
Wire Wire Line
3750 5100 3750 5450
Wire Wire Line
3750 5450 2350 5450
Wire Wire Line
2350 5450 2350 5100
Wire Wire Line
2350 5100 3100 5100
$Comp
L Device:C C3
U 1 1 5FB81404
P 7200 7600
F 0 "C3" H 7315 7646 50 0000 L CNN
F 1 "C" H 7315 7555 50 0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 7238 7450 50 0001 C CNN
F 3 "~" H 7200 7600 50 0001 C CNN
1 7200 7600
1 0 0 -1
$EndComp
$Comp
L Device:C C4
U 1 1 5FB82906
P 8000 7600
F 0 "C4" H 8115 7646 50 0000 L CNN
F 1 "C" H 8115 7555 50 0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 8038 7450 50 0001 C CNN
F 3 "~" H 8000 7600 50 0001 C CNN
1 8000 7600
1 0 0 -1
$EndComp
$Comp
L Device:C C2
U 1 1 5FB849D8
P 6750 8500
F 0 "C2" H 6865 8546 50 0000 L CNN
F 1 "C" H 6865 8455 50 0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 6788 8350 50 0001 C CNN
F 3 "~" H 6750 8500 50 0001 C CNN
1 6750 8500
1 0 0 -1
$EndComp
$Comp
L Device:C C1
U 1 1 5FB85911
P 5600 4000
F 0 "C1" H 5715 4046 50 0000 L CNN
F 1 "C" H 5715 3955 50 0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 5638 3850 50 0001 C CNN
F 3 "~" H 5600 4000 50 0001 C CNN
1 5600 4000
1 0 0 -1
$EndComp
$Comp
L Device:C C5
U 1 1 5FB8694D
P 9900 3950
F 0 "C5" H 10015 3996 50 0000 L CNN
F 1 "C" H 10015 3905 50 0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 9938 3800 50 0001 C CNN
F 3 "~" H 9900 3950 50 0001 C CNN
1 9900 3950
1 0 0 -1
$EndComp
$Comp
L Device:C C6
U 1 1 5FB87862
P 9900 6050
F 0 "C6" H 10015 6096 50 0000 L CNN
F 1 "C" H 10015 6005 50 0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 9938 5900 50 0001 C CNN
F 3 "~" H 9900 6050 50 0001 C CNN
1 9900 6050
1 0 0 -1
$EndComp
Connection ~ 9900 4300
Wire Wire Line
9900 4300 10950 4300
Wire Wire Line
9900 4100 9900 4300
Wire Wire Line
11000 3100 9900 3100
Wire Wire Line
10000 2650 10000 3800
Wire Wire Line
10000 3800 9900 3800
Wire Wire Line
9950 4700 9950 5800
Wire Wire Line
9950 5800 9900 5800
Wire Wire Line
9900 5800 9900 5900
Wire Wire Line
9900 6300 9400 6300
Wire Wire Line
9900 6200 9900 6300
Connection ~ 8000 7750
Wire Wire Line
8000 7750 7550 7750
Wire Wire Line
8000 7450 8000 6750
Connection ~ 8000 6750
Wire Wire Line
8000 6750 7550 6750
Wire Wire Line
7550 7750 7200 7750
Connection ~ 7550 7750
Wire Wire Line
7200 7450 7200 6750
Connection ~ 7200 6750
Wire Wire Line
7200 6750 7050 6750
Wire Wire Line
6750 8350 6750 7800
Wire Wire Line
6750 7800 7050 7800
Wire Wire Line
7050 7800 7050 6750
Connection ~ 7050 6750
Wire Wire Line
7050 6750 6250 6750
Wire Wire Line
5450 4300 5600 4300
Wire Wire Line
5600 4300 5600 4150
Connection ~ 5450 4300
Wire Wire Line
5600 3850 5700 3850
Connection ~ 5700 3850
Wire Wire Line
9900 5000 10800 5000
Wire Wire Line
9900 5100 10750 5100
Wire Wire Line
9900 5200 11150 5200
Wire Wire Line
9900 5300 11200 5300
Wire Wire Line
9900 5400 10700 5400
Wire Wire Line
9900 5500 10650 5500
Wire Wire Line
9900 5600 10600 5600
Wire Wire Line
9900 5700 14350 5700
Wire Wire Line
8000 5900 8900 5900
Wire Wire Line
7900 4100 8900 4100
Wire Wire Line
7700 2700 7700 2400
Wire Wire Line
7700 2400 13150 2400
Wire Wire Line
13150 2400 13150 2650
Wire Wire Line
13550 2650 13450 2650
Wire Wire Line
13450 2650 13450 2350
Wire Wire Line
13450 2350 9400 2350
Wire Wire Line
9400 2350 9400 2650
Connection ~ 13450 2650
Wire Wire Line
9400 2650 10000 2650
Connection ~ 9400 2650
Wire Wire Line
9400 2650 9400 2700
Wire Wire Line
5700 3850 5700 6800
Wire Wire Line
9950 4700 10400 4700
Wire Wire Line
10400 4700 10400 2650
Wire Wire Line
10400 2650 10000 2650
Connection ~ 9950 4700
Connection ~ 10000 2650
Text Notes 3700 5800 0 50 ~ 0
R/W
Text Notes 4350 4550 0 50 ~ 0
Device Select\n($C08+n0 - $C08+nF peripheral)
Text Notes 3850 5250 0 50 ~ 0
I/O Select\n($Cn00 - $CnFF Firmware)
Text Notes 4750 6050 0 50 ~ 0
A0
Text Notes 4750 6550 0 50 ~ 0
A1
Text Notes 4450 5600 0 50 ~ 0
Inverted R/W
Text Notes 4600 6400 0 50 ~ 0
R/W
Text Notes 6200 6250 0 50 ~ 0
Low on\nA1 low\nR/W low
Text Notes 6250 4250 0 50 ~ 0
Low on\nR/W high\nA0 low\n
Wire Wire Line
5700 2700 5150 2700
Connection ~ 5700 2700
Wire Wire Line
4550 3900 4550 5700
Wire Wire Line
5850 8100 5800 8100
Wire Wire Line
5850 8200 5800 8200
Wire Wire Line
5800 8200 5800 8100
Connection ~ 5800 8100
Wire Wire Line
5800 8100 4600 8100
Update schematic/PCB to work with more EPROM types
2020-12-14 03:19:04 +00:00
Wire Wire Line
5850 8300 5700 8300
Connection ~ 5700 8300
Wire Wire Line
5700 8300 5700 6800
Wire Wire Line
8600 9050 6750 9050
Connection ~ 4600 9050
Wire Wire Line
4600 9050 3600 9050
Connection ~ 6750 9050
Wire Wire Line
6750 9050 6250 9050
Wire Wire Line
6250 9000 6250 9050
Connection ~ 6250 9050
Wire Wire Line
6250 9050 4600 9050
Wire Wire Line
8600 7750 8600 9050
Wire Wire Line
6750 8650 6750 9050
Connection ~ 6250 6800
$Comp
L Memory_EPROM:27C256 U1
U 1 1 5FD87325
P 6250 7900
F 0 "U1" H 6250 9178 50 0000 C CNN
F 1 "27C256" H 6250 9087 50 0000 C CNN
F 2 "Package_DIP:DIP-28_W15.24mm" H 6250 7900 50 0001 C CNN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/doc0014.pdf" H 6250 7900 50 0001 C CNN
1 6250 7900
1 0 0 -1
$EndComp
Wire Wire Line
3600 5300 3600 9050
Wire Wire Line
4600 8100 4600 9050
Connection ~ 5700 8400
Wire Wire Line
5700 8400 5850 8400
Wire Wire Line
5650 8600 5650 8700
Connection ~ 5650 8700
Wire Wire Line
5650 8700 5650 8800
Wire Wire Line
5650 8700 5850 8700
Wire Wire Line
5650 8800 5850 8800
Wire Wire Line
5700 8400 5700 8600
Wire Wire Line
5700 8600 5850 8600
Add ground wires to EPROM address lines
2020-12-13 05:43:19 +00:00
$EndSCHEMATC
Reference in New Issue Copy Permalink