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" Date "2020-12-29" Rev "0.9" Comp "Terence J. Boldt" Comment1 "Third Prototype" 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 1750 2800 F 0 "J0" H 1800 4217 50 0000 C CNN F 1 "Apple II Expansion Bus" H 1800 4126 50 0000 C CNN F 2 "Apple2:Apple II Expansion Edge Connector" H 1750 2800 50 0001 C CNN F 3 "~" H 1750 2800 50 0001 C CNN 1 1750 2800 1 0 0 -1 $EndComp $Comp L 74xx:74LS245 U0 U 1 1 5FA15F43 P 3600 2200 F 0 "U0" H 3600 3181 50 0000 C CNN F 1 "74LS245" H 3600 3090 50 0000 C CNN F 2 "Package_DIP:DIP-20_W7.62mm" H 3600 2200 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS245" H 3600 2200 50 0001 C CNN 1 3600 2200 1 0 0 -1 $EndComp $Comp L 74xx:74LS245 U4 U 1 1 5FA19168 P 7850 2200 F 0 "U4" H 7850 3181 50 0000 C CNN F 1 "74LVC245" H 7850 3090 50 0000 C CNN F 2 "Package_DIP:DIP-20_W7.62mm" H 7850 2200 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS245" H 7850 2200 50 0001 C CNN 1 7850 2200 1 0 0 -1 $EndComp $Comp L Connector:Raspberry_Pi_2_3 J1 U 1 1 5FA19C2C P 11800 2650 F 0 "J1" H 11800 4131 50 0000 C CNN F 1 "Raspberry_Pi_2_3" H 11800 4040 50 0000 C CNN F 2 "Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical" H 11800 2650 50 0001 C CNN F 3 "https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_3bplus_1p0_reduced.pdf" H 11800 2650 50 0001 C CNN 1 11800 2650 1 0 0 -1 $EndComp $Comp L 74xx:74LS374 U5 U 1 1 5FA1EB22 P 7850 4200 F 0 "U5" H 7850 5181 50 0000 C CNN F 1 "74LVC374" H 7850 5090 50 0000 C CNN F 2 "Package_DIP:DIP-20_W7.62mm" H 7850 4200 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS374" H 7850 4200 50 0001 C CNN 1 7850 4200 1 0 0 -1 $EndComp Wire Wire Line 3100 1700 2050 1700 Wire Wire Line 3100 1800 2050 1800 Wire Wire Line 3100 1900 2050 1900 Wire Wire Line 2050 2000 3100 2000 Wire Wire Line 3100 2100 2050 2100 Wire Wire Line 2050 2200 3100 2200 Wire Wire Line 3100 2300 2050 2300 Wire Wire Line 2050 2400 3100 2400 Wire Wire Line 7350 1900 6750 1900 Wire Wire Line 7350 2200 6600 2200 Wire Wire Line 7350 2400 6500 2400 Wire Wire Line 6850 1700 6850 3700 Wire Wire Line 6850 3700 7350 3700 Connection ~ 6850 1700 Wire Wire Line 6850 1700 7350 1700 Wire Wire Line 6800 1800 6800 3800 Wire Wire Line 6800 3800 7350 3800 Connection ~ 6800 1800 Wire Wire Line 6800 1800 7350 1800 Wire Wire Line 6750 1900 6750 3900 Wire Wire Line 6750 3900 7350 3900 Connection ~ 6750 1900 Wire Wire Line 6700 2000 6700 4000 Wire Wire Line 6700 4000 7350 4000 Connection ~ 6700 2000 Wire Wire Line 6700 2000 7350 2000 Wire Wire Line 6650 2100 6650 4100 Wire Wire Line 6650 4100 7350 4100 Connection ~ 6650 2100 Wire Wire Line 6650 2100 7350 2100 Wire Wire Line 6600 2200 6600 4200 Wire Wire Line 6600 4200 7350 4200 Connection ~ 6600 2200 Wire Wire Line 6550 2300 6550 4300 Wire Wire Line 6550 4300 7350 4300 Connection ~ 6550 2300 Wire Wire Line 6550 2300 7350 2300 Wire Wire Line 6500 2400 6500 4400 Wire Wire Line 6500 4400 7350 4400 Connection ~ 6500 2400 Wire Wire Line 5150 8150 5100 8150 Wire Wire Line 5200 8250 5100 8250 Wire Wire Line 5250 8350 5100 8350 Wire Wire Line 5100 8450 5300 8450 Wire Wire Line 5350 8550 5100 8550 Wire Wire Line 5100 8650 5400 8650 Wire Wire Line 5450 8750 5100 8750 Wire Wire Line 4300 8050 1400 8050 Wire Wire Line 1400 1700 1550 1700 Wire Wire Line 1550 1800 1350 1800 Wire Wire Line 1350 1800 1350 5150 Wire Wire Line 1350 8150 4300 8150 Wire Wire Line 4300 8250 1300 8250 Wire Wire Line 1300 1900 1550 1900 Wire Wire Line 1550 2000 1250 2000 Wire Wire Line 1250 8350 4300 8350 Wire Wire Line 1200 8450 4300 8450 Wire Wire Line 4300 8550 1150 8550 Wire Wire Line 1150 2200 1550 2200 Wire Wire Line 1100 8650 4300 8650 Wire Wire Line 4300 8750 1050 8750 Wire Wire Line 1050 2400 1550 2400 Wire Wire Line 4300 8850 1000 8850 Wire Wire Line 1000 2500 1550 2500 Wire Wire Line 1550 2600 950 2600 Wire Wire Line 950 8950 4300 8950 Wire Wire Line 4300 9050 900 9050 Wire Wire Line 900 2700 1550 2700 Wire Wire Line 1550 1600 1450 1600 Wire Wire Line 1450 1600 1450 4200 Wire Wire Line 1450 9650 4100 9650 Wire Wire Line 4150 7850 4700 7850 Wire Wire Line 1550 7850 4150 7850 Connection ~ 4150 7850 Wire Wire Line 4150 1400 6150 1400 Wire Wire Line 4150 1400 4150 2550 Wire Wire Line 7050 5000 7850 5000 Wire Wire Line 7050 5000 7050 4700 Wire Wire Line 7050 3000 7850 3000 Wire Wire Line 7350 2600 7050 2600 Wire Wire Line 7050 2600 7050 3000 Connection ~ 7050 3000 Wire Wire Line 7350 4700 7050 4700 Connection ~ 7050 4700 Wire Wire Line 7050 4700 7050 3000 Wire Wire Line 11700 1350 11600 1350 Connection ~ 11600 1350 Wire Wire Line 7850 3000 8350 3000 Wire Wire Line 9400 3000 9400 3950 Wire Wire Line 9400 3950 11400 3950 Connection ~ 7850 3000 Wire Wire Line 11400 3950 11500 3950 Connection ~ 11400 3950 Wire Wire Line 11500 3950 11600 3950 Connection ~ 11500 3950 Wire Wire Line 11600 3950 11700 3950 Connection ~ 11600 3950 Wire Wire Line 11700 3950 11800 3950 Connection ~ 11700 3950 Wire Wire Line 11800 3950 11900 3950 Connection ~ 11800 3950 Wire Wire Line 11900 3950 12000 3950 Connection ~ 11900 3950 Wire Wire Line 12000 3950 12100 3950 Connection ~ 12000 3950 Wire Wire Line 12600 2350 12850 2350 Wire Wire Line 12850 2350 12850 1200 Wire Wire Line 12850 1200 8350 1200 Wire Wire Line 8350 1200 8350 1700 Wire Wire Line 9450 2150 9450 1800 Wire Wire Line 11000 3350 9500 3350 Wire Wire Line 9500 3350 9500 1900 Wire Wire Line 9500 1900 8350 1900 Wire Wire Line 11000 2850 9550 2850 Wire Wire Line 9550 2850 9550 2000 Wire Wire Line 9550 2000 8350 2000 Wire Wire Line 11000 2150 9450 2150 Wire Wire Line 12600 3050 12900 3050 Wire Wire Line 12900 3050 12900 1000 Wire Wire Line 12900 1000 8500 1000 Wire Wire Line 8500 1000 8500 2100 Wire Wire Line 8500 2100 8350 2100 Wire Wire Line 12600 2950 12950 2950 Wire Wire Line 12950 2950 12950 950 Wire Wire Line 12950 950 8550 950 Wire Wire Line 8550 950 8550 2200 Wire Wire Line 8550 2200 8350 2200 Wire Wire Line 12600 3150 13000 3150 Wire Wire Line 13000 3150 13000 900 Wire Wire Line 13000 900 8600 900 Wire Wire Line 8600 900 8600 2300 Wire Wire Line 8600 2300 8350 2300 Wire Wire Line 12600 2450 13050 2450 Wire Wire Line 13050 2450 13050 850 Wire Wire Line 13050 850 8650 850 Wire Wire Line 8650 850 8650 2400 Wire Wire Line 8650 2400 8350 2400 Wire Wire Line 12600 2550 13050 2550 Wire Wire Line 13050 2550 13050 4100 Wire Wire Line 13050 4100 9250 4100 Wire Wire Line 9250 4100 9250 3700 Wire Wire Line 9200 3800 9200 4150 Wire Wire Line 9200 4150 12750 4150 Wire Wire Line 12750 4150 12750 3450 Wire Wire Line 12750 3450 12600 3450 Wire Wire Line 9600 2450 9600 3900 Wire Wire Line 9600 2450 11000 2450 Wire Wire Line 11000 3250 9650 3250 Wire Wire Line 9650 3250 9650 4000 Wire Wire Line 9150 2650 11000 2650 Wire Wire Line 9150 2650 9150 4100 Wire Wire Line 11000 2550 9100 2550 Wire Wire Line 9100 2550 9100 4200 Wire Wire Line 11000 2050 9050 2050 Wire Wire Line 9050 2050 9050 4300 Wire Wire Line 12600 3350 12800 3350 Wire Wire Line 12800 3350 12800 4400 Wire Wire Line 7850 3400 8400 3400 Connection ~ 7850 5000 Text Notes 3150 9850 0 50 ~ 0 Enable Firmware EPROM\non IO_SELECT low Wire Wire Line 1550 3300 850 3300 Wire Wire Line 850 3300 850 4400 Wire Wire Line 3000 2600 3100 2600 Text Notes 2450 2650 0 50 ~ 0 Direction is\nR/W Inverted Wire Wire Line 1400 4650 3250 4650 Wire Wire Line 4650 2700 5750 2700 Wire Wire Line 1400 4650 1400 1700 $Comp L 74xx:74LS32 U3 U 1 1 5FB50A31 P 6050 2800 F 0 "U3" H 6050 3125 50 0000 C CNN F 1 "74LS32" H 6050 3034 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6050 2800 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 6050 2800 50 0001 C CNN 1 6050 2800 1 0 0 -1 $EndComp Wire Wire Line 2050 2500 2350 2500 Wire Wire Line 2350 3200 5750 3200 Wire Wire Line 5750 3200 5750 2900 Wire Wire Line 7350 2800 7350 2700 $Comp L 74xx:74LS32 U3 U 2 1 5FB9C73F P 3550 4550 F 0 "U3" H 3550 4875 50 0000 C CNN F 1 "74LS32" H 3550 4784 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 3550 4550 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 3550 4550 50 0001 C CNN 2 3550 4550 1 0 0 -1 $EndComp Wire Wire Line 3000 4400 3250 4400 Wire Wire Line 3250 4400 3250 4450 Connection ~ 3000 4400 Wire Wire Line 3850 4550 4650 4550 Wire Wire Line 4650 4550 4650 2700 $Comp L 74xx:74LS32 U3 U 3 1 5FBF09C5 P 6150 4600 F 0 "U3" H 6150 4925 50 0000 C CNN F 1 "74LS32" H 6150 4834 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6150 4600 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 6150 4600 50 0001 C CNN 3 6150 4600 1 0 0 -1 $EndComp Wire Wire Line 5750 4500 5850 4500 Wire Wire Line 5750 3200 5750 4500 Connection ~ 5750 3200 $Comp L 74xx:74LS32 U3 U 4 1 5FC54438 P 3550 5050 F 0 "U3" H 3550 5375 50 0000 C CNN F 1 "74LS32" H 3550 5284 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 3550 5050 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 3550 5050 50 0001 C CNN 4 3550 5050 1 0 0 -1 $EndComp Wire Wire Line 5850 4700 3850 4700 Wire Wire Line 3850 4700 3850 5050 Wire Wire Line 3250 5150 1350 5150 Text Notes 6350 5050 0 50 ~ 0 Latch Clock on\nR/W low\nA1 low\nDEV_SELECT low Wire Wire Line 3150 4950 3200 4950 Wire Wire Line 3000 4400 3000 4750 Wire Wire Line 3000 4750 2550 4750 Wire Wire Line 2550 4750 2550 4850 Wire Wire Line 850 4400 2400 4400 Wire Wire Line 2350 2500 2350 3200 $Comp L 74xx:74LS00 U2 U 1 1 5FD4E618 P 2600 3600 F 0 "U2" H 2600 3925 50 0000 C CNN F 1 "74LS00" H 2600 3834 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 2600 3600 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 2600 3600 50 0001 C CNN 1 2600 3600 1 0 0 -1 $EndComp Wire Wire Line 2350 3200 2300 3200 Wire Wire Line 2300 3200 2300 3500 Connection ~ 2350 3200 $Comp L 74xx:74LS00 U2 U 2 1 5FD74B7A P 3400 3600 F 0 "U2" H 3400 3925 50 0000 C CNN F 1 "74LS00" H 3400 3834 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 3400 3600 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 3400 3600 50 0001 C CNN 2 3400 3600 1 0 0 -1 $EndComp Wire Wire Line 3900 4000 3900 3000 Wire Wire Line 3900 3000 3600 3000 Wire Wire Line 2050 4000 3900 4000 Wire Wire Line 2900 3600 3100 3600 Wire Wire Line 3100 3600 3100 3500 Wire Wire Line 3100 3700 3100 3600 Connection ~ 3100 3600 Wire Wire Line 3700 3600 3700 3050 Wire Wire Line 3700 3050 3100 3050 Wire Wire Line 3100 3050 3100 2700 Wire Wire Line 1450 4200 2300 4200 Wire Wire Line 2300 4200 2300 3700 $Comp L 74xx:74LS00 U2 U 3 1 5FE27921 P 2850 4950 F 0 "U2" H 2850 5275 50 0000 C CNN F 1 "74LS00" H 2850 5184 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 2850 4950 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 2850 4950 50 0001 C CNN 3 2850 4950 1 0 0 -1 $EndComp Connection ~ 2550 4850 Wire Wire Line 2550 4850 2550 5050 $Comp L 74xx:74LS00 U2 U 4 1 5FE48B46 P 2700 4400 F 0 "U2" H 2700 4725 50 0000 C CNN F 1 "74LS00" H 2700 4634 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 2700 4400 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 2700 4400 50 0001 C CNN 4 2700 4400 1 0 0 -1 $EndComp Wire Wire Line 2400 4300 2400 4400 Wire Wire Line 2400 4400 2400 4500 Connection ~ 2400 4400 Text Notes 7250 3100 0 50 ~ 0 Enable on\nR/W high\nA0 low\nDEV_SELECT low Text Notes 3700 3700 0 50 ~ 0 Enable on either\nDEV_SELECT low\nIO_SELECT low $Comp L 74xx:74LS00 U2 U 5 1 5FED8457 P 6000 8300 F 0 "U2" H 6230 8346 50 0000 L CNN F 1 "74LS00" H 6230 8255 50 0000 L CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6000 8300 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 6000 8300 50 0001 C CNN 5 6000 8300 1 0 0 -1 $EndComp $Comp L 74xx:74LS32 U3 U 5 1 5FEDB516 P 6750 8300 F 0 "U3" H 6980 8346 50 0000 L CNN F 1 "74LS32" H 6980 8255 50 0000 L CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6750 8300 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 6750 8300 50 0001 C CNN 5 6750 8300 1 0 0 -1 $EndComp Wire Wire Line 6750 8800 7050 8800 Connection ~ 7050 8800 Wire Wire Line 6750 8800 6450 8800 Connection ~ 6750 8800 Wire Wire Line 6750 7800 6450 7800 Wire Wire Line 4700 7800 4700 7850 Connection ~ 6000 7800 Wire Wire Line 1550 3900 1500 3900 Wire Wire Line 1500 3900 1500 4100 Wire Wire Line 1500 4100 2150 4100 Wire Wire Line 2150 4100 2150 3900 Wire Wire Line 2150 3900 2050 3900 Wire Wire Line 2050 3800 2200 3800 Wire Wire Line 2200 3800 2200 4150 Wire Wire Line 2200 4150 800 4150 Wire Wire Line 800 4150 800 3800 Wire Wire Line 800 3800 1550 3800 $Comp L Device:C C3 U 1 1 5FB81404 P 5650 8650 F 0 "C3" H 5765 8696 50 0000 L CNN F 1 "C" H 5765 8605 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 5688 8500 50 0001 C CNN F 3 "~" H 5650 8650 50 0001 C CNN 1 5650 8650 1 0 0 -1 $EndComp $Comp L Device:C C4 U 1 1 5FB82906 P 6450 8650 F 0 "C4" H 6565 8696 50 0000 L CNN F 1 "C" H 6565 8605 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 6488 8500 50 0001 C CNN F 3 "~" H 6450 8650 50 0001 C CNN 1 6450 8650 1 0 0 -1 $EndComp $Comp L Device:C C2 U 1 1 5FB849D8 P 5200 9550 F 0 "C2" H 5315 9596 50 0000 L CNN F 1 "C" H 5315 9505 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 5238 9400 50 0001 C CNN F 3 "~" H 5200 9550 50 0001 C CNN 1 5200 9550 1 0 0 -1 $EndComp $Comp L Device:C C1 U 1 1 5FB85911 P 4050 2700 F 0 "C1" H 4165 2746 50 0000 L CNN F 1 "C" H 4165 2655 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 4088 2550 50 0001 C CNN F 3 "~" H 4050 2700 50 0001 C CNN 1 4050 2700 1 0 0 -1 $EndComp $Comp L Device:C C5 U 1 1 5FB8694D P 8350 2650 F 0 "C5" H 8465 2696 50 0000 L CNN F 1 "C" H 8465 2605 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 8388 2500 50 0001 C CNN F 3 "~" H 8350 2650 50 0001 C CNN 1 8350 2650 1 0 0 -1 $EndComp $Comp L Device:C C6 U 1 1 5FB87862 P 8350 4750 F 0 "C6" H 8465 4796 50 0000 L CNN F 1 "C" H 8465 4705 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 8388 4600 50 0001 C CNN F 3 "~" H 8350 4750 50 0001 C CNN 1 8350 4750 1 0 0 -1 $EndComp Connection ~ 8350 3000 Wire Wire Line 8350 3000 9400 3000 Wire Wire Line 8350 2800 8350 3000 Wire Wire Line 9450 1800 8350 1800 Wire Wire Line 8450 1350 8450 2500 Wire Wire Line 8450 2500 8350 2500 Wire Wire Line 8400 3400 8400 4500 Wire Wire Line 8400 4500 8350 4500 Wire Wire Line 8350 4500 8350 4600 Wire Wire Line 8350 5000 7850 5000 Wire Wire Line 8350 4900 8350 5000 Connection ~ 6450 8800 Wire Wire Line 6450 8500 6450 7800 Connection ~ 6450 7800 Wire Wire Line 6450 7800 6000 7800 Wire Wire Line 6000 8800 5650 8800 Connection ~ 6000 8800 Wire Wire Line 5650 8500 5650 7800 Connection ~ 5650 7800 Wire Wire Line 5650 7800 5500 7800 Wire Wire Line 5200 9400 5200 8850 Wire Wire Line 5200 8850 5500 8850 Wire Wire Line 5500 8850 5500 7800 Connection ~ 5500 7800 Wire Wire Line 5500 7800 4700 7800 Wire Wire Line 3900 3000 4050 3000 Wire Wire Line 4050 3000 4050 2850 Connection ~ 3900 3000 Wire Wire Line 4050 2550 4150 2550 Wire Wire Line 8350 3700 9250 3700 Wire Wire Line 8350 3800 9200 3800 Wire Wire Line 8350 3900 9600 3900 Wire Wire Line 8350 4000 9650 4000 Wire Wire Line 8350 4100 9150 4100 Wire Wire Line 8350 4200 9100 4200 Wire Wire Line 8350 4300 9050 4300 Wire Wire Line 8350 4400 12800 4400 Wire Wire Line 6450 4600 7350 4600 Wire Wire Line 6350 2800 7350 2800 Wire Wire Line 6150 1400 6150 1100 Wire Wire Line 6150 1100 11600 1100 Wire Wire Line 11600 1100 11600 1350 Wire Wire Line 12000 1350 11900 1350 Wire Wire Line 11900 1350 11900 1050 Wire Wire Line 11900 1050 7850 1050 Wire Wire Line 7850 1050 7850 1350 Connection ~ 11900 1350 Wire Wire Line 7850 1350 8450 1350 Connection ~ 7850 1350 Wire Wire Line 7850 1350 7850 1400 Wire Wire Line 8400 3400 8850 3400 Wire Wire Line 8850 3400 8850 1350 Wire Wire Line 8850 1350 8450 1350 Connection ~ 8400 3400 Connection ~ 8450 1350 Text Notes 2150 4500 0 50 ~ 0 R/W Text Notes 2800 3250 0 50 ~ 0 Device Select\n($C08+n0 - $C08+nF peripheral) Text Notes 2300 3950 0 50 ~ 0 I/O Select\n($Cn00 - $CnFF Firmware) Text Notes 3200 4750 0 50 ~ 0 A0 Text Notes 3200 5250 0 50 ~ 0 A1 Text Notes 2900 4300 0 50 ~ 0 Inverted R/W Text Notes 3050 5100 0 50 ~ 0 R/W Text Notes 4650 4950 0 50 ~ 0 Low on\nA1 low\nR/W low Text Notes 4700 2950 0 50 ~ 0 Low on\nR/W high\nA0 low\n Wire Wire Line 4150 1400 3600 1400 Connection ~ 4150 1400 Wire Wire Line 3000 2600 3000 4400 Wire Wire Line 7050 10100 5200 10100 Connection ~ 5200 10100 Wire Wire Line 5200 10100 4700 10100 Wire Wire Line 4700 10050 4700 10100 Connection ~ 4700 10100 Wire Wire Line 7050 8800 7050 10100 Wire Wire Line 5200 9700 5200 10100 Connection ~ 4700 7850 $Comp L Memory_EPROM:27C256 U1 U 1 1 5FD87325 P 4700 8950 F 0 "U1" H 4700 10228 50 0000 C CNN F 1 "27C256" H 4700 10137 50 0000 C CNN F 2 "Package_DIP:DIP-28_W15.24mm_Socket" H 4700 8950 50 0001 C CNN F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/doc0014.pdf" H 4700 8950 50 0001 C CNN 1 4700 8950 1 0 0 -1 $EndComp Wire Wire Line 4100 9650 4100 9750 Connection ~ 4100 9750 Wire Wire Line 4100 9750 4100 9850 Wire Wire Line 4100 9750 4300 9750 Wire Wire Line 4100 9850 4300 9850 Wire Wire Line 4150 9650 4300 9650 Wire Wire Line 2050 10100 4700 10100 Wire Wire Line 4150 7850 4150 9650 $Comp L 74xx:74LS245 U6 U 1 1 5FED6949 P 11050 5650 F 0 "U6" H 11050 6628 50 0000 C CNN F 1 "74LVC245" H 11050 6537 50 0000 C CNN F 2 "Package_DIP:DIP-20_W7.62mm" H 11050 5650 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS245" H 11050 5650 50 0001 C CNN 1 11050 5650 1 0 0 -1 $EndComp $Comp L 74xx:74LS374 U7 U 1 1 5FED6A94 P 11050 7650 F 0 "U7" H 11050 8628 50 0000 C CNN F 1 "74LVC374" H 11050 8537 50 0000 C CNN F 2 "Package_DIP:DIP-20_W7.62mm" H 11050 7650 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS374" H 11050 7650 50 0001 C CNN 1 11050 7650 1 0 0 -1 $EndComp Wire Wire Line 4100 1700 5100 1700 Wire Wire Line 4100 1800 5150 1800 Wire Wire Line 4100 2000 5250 2000 Wire Wire Line 4100 2100 5300 2100 Wire Wire Line 4100 2300 5400 2300 Wire Wire Line 4100 1900 5200 1900 Wire Wire Line 4100 2200 5350 2200 Wire Wire Line 4100 2400 5450 2400 Wire Wire Line 1300 1900 1300 6450 Wire Wire Line 1250 2000 1250 7000 Wire Wire Line 1550 2100 1200 2100 Wire Wire Line 1200 2100 1200 8450 Wire Wire Line 1150 2200 1150 8550 Wire Wire Line 1550 2300 1100 2300 Wire Wire Line 1100 2300 1100 8650 Wire Wire Line 1050 2400 1050 8750 Wire Wire Line 1000 2500 1000 8850 Wire Wire Line 950 2600 950 8950 Wire Wire Line 900 2700 900 9050 Wire Wire Line 2050 4000 2050 10100 Connection ~ 2050 4000 Wire Wire Line 1550 4000 1550 7850 Wire Wire Line 1450 4200 1450 9650 Connection ~ 1450 4200 Wire Wire Line 1400 4650 1400 8050 Connection ~ 1400 4650 Wire Wire Line 1350 5150 1350 8150 Connection ~ 1350 5150 Connection ~ 4150 2550 Wire Wire Line 5100 1700 5100 5150 Connection ~ 5100 1700 Wire Wire Line 5100 1700 6850 1700 Wire Wire Line 5150 1800 5150 5250 Connection ~ 5150 1800 Wire Wire Line 5150 1800 6800 1800 Wire Wire Line 5200 1900 5200 5350 Connection ~ 5200 1900 Wire Wire Line 5200 1900 6750 1900 Wire Wire Line 5250 2000 5250 5450 Connection ~ 5250 2000 Wire Wire Line 5250 2000 6700 2000 Wire Wire Line 5300 2100 5300 5550 Connection ~ 5300 2100 Wire Wire Line 5300 2100 6650 2100 Wire Wire Line 5350 2200 5350 5650 Connection ~ 5350 2200 Wire Wire Line 5350 2200 6600 2200 Wire Wire Line 5400 2300 5400 5750 Connection ~ 5400 2300 Wire Wire Line 5400 2300 6550 2300 Wire Wire Line 5450 2400 5450 5850 Connection ~ 5450 2400 Wire Wire Line 5450 2400 6500 2400 Wire Wire Line 10550 5150 9950 5150 Connection ~ 5100 5150 Wire Wire Line 10550 5250 9900 5250 Connection ~ 5150 5250 Wire Wire Line 10550 5350 9850 5350 Connection ~ 5200 5350 Wire Wire Line 10550 5450 9800 5450 Connection ~ 5250 5450 Wire Wire Line 10550 5550 9750 5550 Connection ~ 5300 5550 Wire Wire Line 10550 5650 9700 5650 Connection ~ 5350 5650 Wire Wire Line 10550 5750 9650 5750 Connection ~ 5400 5750 Wire Wire Line 10550 5850 9600 5850 Connection ~ 5450 5850 Wire Wire Line 7050 5000 7050 6050 Connection ~ 7050 5000 Wire Wire Line 11050 6450 10350 6450 Wire Wire Line 11050 8450 10550 8450 Wire Wire Line 8850 3400 10200 3400 Wire Wire Line 10200 3400 10200 4850 Wire Wire Line 10200 4850 11050 4850 Connection ~ 8850 3400 Wire Wire Line 10200 4850 10200 6850 Wire Wire Line 10200 6850 11050 6850 Connection ~ 10200 4850 Wire Wire Line 10550 7150 9950 7150 Wire Wire Line 9950 7150 9950 5150 Connection ~ 9950 5150 Wire Wire Line 9950 5150 5100 5150 Wire Wire Line 10550 7250 9900 7250 Wire Wire Line 9900 7250 9900 5250 Connection ~ 9900 5250 Wire Wire Line 9900 5250 5150 5250 Wire Wire Line 9850 7350 9850 5350 Wire Wire Line 9850 7350 10550 7350 Connection ~ 9850 5350 Wire Wire Line 9850 5350 5200 5350 Wire Wire Line 10550 7450 9800 7450 Wire Wire Line 9800 7450 9800 5450 Connection ~ 9800 5450 Wire Wire Line 9800 5450 5250 5450 Wire Wire Line 10550 7550 9750 7550 Wire Wire Line 9750 7550 9750 5550 Connection ~ 9750 5550 Wire Wire Line 9750 5550 5300 5550 Wire Wire Line 10550 7650 9700 7650 Wire Wire Line 9700 7650 9700 5650 Connection ~ 9700 5650 Wire Wire Line 9700 5650 5350 5650 Wire Wire Line 10550 7750 9650 7750 Wire Wire Line 9650 7750 9650 5750 Connection ~ 9650 5750 Wire Wire Line 9650 5750 5400 5750 Wire Wire Line 9600 7850 9600 5850 Wire Wire Line 9600 7850 10550 7850 Connection ~ 9600 5850 Wire Wire Line 9600 5850 5450 5850 Wire Wire Line 10550 8150 10550 8450 Wire Wire Line 10550 6050 10350 6050 Wire Wire Line 10350 6050 10350 6450 Wire Wire Line 2600 10150 2600 9150 Wire Wire Line 2600 9150 4300 9150 Wire Wire Line 2650 10200 2650 9250 Wire Wire Line 2650 9250 4300 9250 Wire Wire Line 2700 10250 2700 9350 Wire Wire Line 2700 9350 4300 9350 Wire Wire Line 2750 10300 2750 9450 Wire Wire Line 2750 9450 4300 9450 Wire Wire Line 10350 6050 7050 6050 Connection ~ 10350 6050 Connection ~ 7050 6050 Wire Wire Line 5100 5150 5100 8050 Wire Wire Line 5150 5250 5150 8150 Wire Wire Line 5200 5350 5200 8250 Wire Wire Line 5250 5450 5250 8350 Wire Wire Line 5300 5550 5300 8450 Wire Wire Line 5350 5650 5350 8550 Wire Wire Line 5400 5750 5400 8650 Wire Wire Line 5450 5850 5450 8750 Wire Wire Line 11550 7550 11700 7550 Wire Wire Line 11700 7550 11700 10150 Wire Wire Line 2600 10150 11700 10150 Wire Wire Line 11750 10200 11750 7650 Wire Wire Line 11750 7650 11550 7650 Wire Wire Line 2650 10200 11750 10200 Wire Wire Line 11800 10250 11800 7750 Wire Wire Line 11800 7750 11550 7750 Wire Wire Line 2700 10250 11800 10250 Wire Wire Line 11850 10300 11850 7850 Wire Wire Line 11850 7850 11550 7850 Wire Wire Line 2750 10300 11850 10300 Wire Wire Line 11550 7150 12500 7150 Wire Wire Line 12500 7150 12500 4200 Wire Wire Line 12500 4200 10700 4200 Wire Wire Line 10700 4200 10700 2950 Wire Wire Line 10700 2950 11000 2950 Wire Wire Line 11550 7250 12550 7250 Wire Wire Line 12550 7250 12550 4250 Wire Wire Line 12550 4250 10650 4250 Wire Wire Line 10650 4250 10650 2250 Wire Wire Line 10650 2250 11000 2250 Wire Wire Line 11000 1850 10600 1850 Wire Wire Line 10600 1850 10600 4300 Wire Wire Line 10600 4300 12600 4300 Wire Wire Line 12600 4300 12600 7350 Wire Wire Line 12600 7350 11550 7350 Wire Wire Line 11000 1750 10550 1750 Wire Wire Line 10550 1750 10550 4350 Wire Wire Line 10550 4350 12650 4350 Wire Wire Line 12650 4350 12650 7450 Wire Wire Line 12650 7450 11550 7450 Wire Wire Line 12600 2750 13150 2750 Wire Wire Line 13150 2750 13150 5150 Wire Wire Line 13150 5150 11700 5150 Wire Wire Line 12600 2850 13200 2850 Wire Wire Line 13200 2850 13200 5250 Wire Wire Line 13200 5250 11750 5250 Wire Wire Line 11000 3150 10950 3150 Wire Wire Line 10950 3150 10950 4550 Wire Wire Line 10950 4550 11800 4550 Wire Wire Line 11800 4550 11800 5350 Wire Wire Line 11800 5350 11550 5350 Wire Wire Line 10900 3050 10900 4600 Wire Wire Line 10900 4600 11850 4600 Wire Wire Line 11850 4600 11850 5450 Wire Wire Line 11850 5450 11550 5450 Wire Wire Line 10900 3050 11000 3050 Wire Wire Line 11550 5850 11850 5850 Wire Wire Line 11850 5850 11850 5450 Connection ~ 11850 5450 Wire Wire Line 11550 5750 11800 5750 Wire Wire Line 11800 5750 11800 5350 Connection ~ 11800 5350 Wire Wire Line 11550 5650 11750 5650 Wire Wire Line 11750 5650 11750 5250 Connection ~ 11750 5250 Wire Wire Line 11750 5250 11550 5250 Wire Wire Line 11550 5550 11700 5550 Wire Wire Line 11700 5550 11700 5150 Connection ~ 11700 5150 Wire Wire Line 11700 5150 11550 5150 Wire Wire Line 4150 2550 4150 7850 $Comp L Device:C C8 U 1 1 60A58951 P 12200 7800 F 0 "C8" H 12315 7846 50 0000 L CNN F 1 "C" H 12315 7755 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 12238 7650 50 0001 C CNN F 3 "~" H 12200 7800 50 0001 C CNN 1 12200 7800 1 0 0 -1 $EndComp $Comp L Device:C C7 U 1 1 60A87587 P 12150 5750 F 0 "C7" H 12265 5796 50 0000 L CNN F 1 "C" H 12265 5705 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 12188 5600 50 0001 C CNN F 3 "~" H 12150 5750 50 0001 C CNN 1 12150 5750 1 0 0 -1 $EndComp Wire Wire Line 11050 6850 12200 6850 Wire Wire Line 12200 6850 12200 7650 Connection ~ 11050 6850 Wire Wire Line 11050 8450 12200 8450 Wire Wire Line 12200 8450 12200 7950 Connection ~ 11050 8450 Wire Wire Line 12150 5900 12150 6450 Wire Wire Line 12150 6450 11050 6450 Connection ~ 11050 6450 Wire Wire Line 12150 5600 12150 4850 Wire Wire Line 12150 4850 11050 4850 Connection ~ 11050 4850 Wire Wire Line 11050 8800 11050 8450 Wire Wire Line 7050 6050 7050 8800 $Comp L 74xx:74LS32 U8 U 5 1 60BA60C0 P 7500 8300 F 0 "U8" H 7730 8346 50 0000 L CNN F 1 "74LS32" H 7730 8255 50 0000 L CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 7500 8300 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 7500 8300 50 0001 C CNN 5 7500 8300 1 0 0 -1 $EndComp Connection ~ 7500 8800 Connection ~ 6750 7800 $Comp L Device:C C9 U 1 1 60C3A67B P 7150 8650 F 0 "C9" H 7265 8696 50 0000 L CNN F 1 "C" H 7265 8605 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm" H 7188 8500 50 0001 C CNN F 3 "~" H 7150 8650 50 0001 C CNN 1 7150 8650 1 0 0 -1 $EndComp Connection ~ 7150 8800 Wire Wire Line 7150 8800 7500 8800 Wire Wire Line 7150 8500 7150 7800 Connection ~ 7150 7800 Wire Wire Line 7150 7800 7500 7800 Text Notes 10000 6300 0 50 ~ 0 Enable on\nR/W high\nA2 low\nDEV_SELECT low Text Notes 9850 8200 0 50 ~ 0 Latch Clock on\nR/W low\nA3 low\nDEV_SELECT low $Comp L 74xx:74LS32 U8 U 1 1 60D9A204 P 6550 6250 F 0 "U8" H 6550 6575 50 0000 C CNN F 1 "74LS32" H 6550 6484 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6550 6250 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 6550 6250 50 0001 C CNN 1 6550 6250 1 0 0 -1 $EndComp $Comp L 74xx:74LS32 U8 U 2 1 60D9A31D P 6550 6850 F 0 "U8" H 6550 7175 50 0000 C CNN F 1 "74LS32" H 6550 7084 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6550 6850 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 6550 6850 50 0001 C CNN 2 6550 6850 1 0 0 -1 $EndComp Wire Wire Line 6850 6250 6950 6250 Wire Wire Line 6950 6250 6950 6150 Wire Wire Line 6950 6150 10550 6150 Wire Wire Line 6850 6850 9200 6850 Wire Wire Line 9200 6850 9200 8050 Wire Wire Line 9200 8050 10550 8050 Wire Wire Line 5750 4500 5750 6150 Wire Wire Line 5750 6150 6250 6150 Connection ~ 5750 4500 Wire Wire Line 5750 6150 5750 6750 Wire Wire Line 5750 6750 6250 6750 Connection ~ 5750 6150 Wire Wire Line 7050 8800 7150 8800 Wire Wire Line 6750 7800 7150 7800 Wire Wire Line 5650 7800 6000 7800 Wire Wire Line 6000 8800 6450 8800 Wire Wire Line 7500 8800 11050 8800 $Comp L 74xx:74LS32 U8 U 3 1 60F3F0CC P 3500 6350 F 0 "U8" H 3500 6675 50 0000 C CNN F 1 "74LS32" H 3500 6584 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 3500 6350 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 3500 6350 50 0001 C CNN 3 3500 6350 1 0 0 -1 $EndComp $Comp L 74xx:74LS32 U8 U 4 1 60F3F167 P 3500 6900 F 0 "U8" H 3500 7225 50 0000 C CNN F 1 "74LS32" H 3500 7134 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 3500 6900 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 3500 6900 50 0001 C CNN 4 3500 6900 1 0 0 -1 $EndComp Wire Wire Line 3200 6450 1300 6450 Connection ~ 1300 6450 Wire Wire Line 1300 6450 1300 8250 Wire Wire Line 3200 7000 1250 7000 Connection ~ 1250 7000 Wire Wire Line 1250 7000 1250 8350 Wire Wire Line 3200 4950 3200 5650 Wire Wire Line 3200 5650 2700 5650 Wire Wire Line 2700 5650 2700 6800 Wire Wire Line 2700 6800 3200 6800 Connection ~ 3200 4950 Wire Wire Line 3200 4950 3250 4950 Wire Wire Line 2550 5050 2550 6250 Wire Wire Line 2550 6250 3200 6250 Connection ~ 2550 5050 Wire Wire Line 3800 6350 6250 6350 Wire Wire Line 3800 6900 6250 6900 Wire Wire Line 6250 6900 6250 6950 Text Notes 2700 6200 0 50 ~ 0 Inverted R/W Text Notes 2900 6750 0 50 ~ 0 R/W Text Notes 3000 7100 0 50 ~ 0 A3 Text Notes 3000 6550 0 50 ~ 0 A2 $EndSCHEMATC