EESchema Schematic File Version 2 LIBS:power LIBS:device LIBS:transistors LIBS:conn LIBS:linear LIBS:regul LIBS:74xx LIBS:cmos4000 LIBS:adc-dac LIBS:memory LIBS:xilinx LIBS:microcontrollers LIBS:dsp LIBS:microchip LIBS:analog_switches LIBS:motorola LIBS:texas LIBS:intel LIBS:audio LIBS:interface LIBS:digital-audio LIBS:philips LIBS:display LIBS:cypress LIBS:siliconi LIBS:opto LIBS:atmel LIBS:contrib LIBS:valves LIBS:65xx LIBS:w_connectors LIBS:switches LIBS:RC6502 Serial IO-cache EELAYER 25 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 1 1 Title "" Date "" Rev "" Comp "" Comment1 "" Comment2 "" Comment3 "" Comment4 "" $EndDescr Text GLabel 10600 3800 0 60 Input ~ 0 GND Text GLabel 10600 3900 0 60 Output ~ 0 VCC Text GLabel 10600 2200 0 60 Output ~ 0 A15 Text GLabel 10600 2500 0 60 Output ~ 0 A12 Text GLabel 10600 3300 0 60 Output ~ 0 A4 Text GLabel 10600 3600 0 60 Output ~ 0 A1 Text GLabel 10600 3700 0 60 Output ~ 0 A0 Text GLabel 10600 4800 0 60 BiDi ~ 0 D0 Text GLabel 10600 4900 0 60 BiDi ~ 0 D1 Text GLabel 10600 5000 0 60 BiDi ~ 0 D2 Text GLabel 10600 5100 0 60 BiDi ~ 0 D3 Text GLabel 10600 5200 0 60 BiDi ~ 0 D4 Text GLabel 10600 5300 0 60 BiDi ~ 0 D5 Text GLabel 10600 5400 0 60 BiDi ~ 0 D6 Text GLabel 10600 5500 0 60 BiDi ~ 0 D7 Text GLabel 3950 1650 2 60 BiDi ~ 0 D0 Text GLabel 3950 1750 2 60 BiDi ~ 0 D1 Text GLabel 3950 1850 2 60 BiDi ~ 0 D2 Text GLabel 3950 1950 2 60 BiDi ~ 0 D3 Text GLabel 3950 2050 2 60 BiDi ~ 0 D4 Text GLabel 3950 2250 2 60 BiDi ~ 0 D6 Text GLabel 3950 2350 2 60 BiDi ~ 0 D7 NoConn ~ 10600 5800 NoConn ~ 10600 4300 NoConn ~ 10600 4700 NoConn ~ 10600 5600 NoConn ~ 10600 5700 Text GLabel 2700 3450 0 60 Input ~ 0 A12 Text GLabel 3950 1450 2 60 Input ~ 0 A1 Text GLabel 3950 1350 2 60 Input ~ 0 A0 Text Notes 8375 7500 2 60 ~ 0 RC6502 Serial IO Text Notes 10625 7650 2 60 ~ 0 A NoConn ~ -500 7850 $Comp L CONN_01X39 J1 U 1 1 590B4CA1 P 10800 4100 F 0 "J1" H 10800 6100 50 0000 C CNN F 1 "CONN_01X39" V 10900 4100 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Angled_1x39_Pitch2.54mm" H 10800 4100 50 0001 C CNN F 3 "" H 10800 4100 50 0001 C CNN 1 10800 4100 1 0 0 -1 $EndComp NoConn ~ 10600 5900 NoConn ~ 10600 4400 NoConn ~ 10600 4600 $Comp L C C1 U 1 1 590DFF39 P 10275 1225 F 0 "C1" H 10300 1325 50 0000 L CNN F 1 "100nF" H 10300 1125 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 10313 1075 50 0001 C CNN F 3 "" H 10275 1225 50 0001 C CNN 1 10275 1225 1 0 0 -1 $EndComp $Comp L C C2 U 1 1 590E0960 P 10575 1225 F 0 "C2" H 10600 1325 50 0000 L CNN F 1 "100nF" H 10600 1125 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 10613 1075 50 0001 C CNN F 3 "" H 10575 1225 50 0001 C CNN 1 10575 1225 1 0 0 -1 $EndComp Text GLabel 10025 825 1 60 Input ~ 0 VCC Text GLabel 3950 2150 2 60 BiDi ~ 0 D5 Text GLabel 10025 1650 3 60 Input ~ 0 GND Text GLabel 10600 2300 0 60 Output ~ 0 A14 Text GLabel 10600 2400 0 60 Output ~ 0 A13 $Comp L C C3 U 1 1 59106500 P 10875 1225 F 0 "C3" H 10900 1325 50 0000 L CNN F 1 "100nF" H 10900 1125 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 10913 1075 50 0001 C CNN F 3 "" H 10875 1225 50 0001 C CNN 1 10875 1225 1 0 0 -1 $EndComp NoConn ~ 10600 6000 $Comp L WD65C21 U2 U 1 1 590F34BB P 3300 1850 F 0 "U2" H 3300 700 60 0000 C CNN F 1 "WD65C21" V 3300 1750 60 0000 C CNN F 2 "Housings_DIP:DIP-40_W15.24mm_Socket" H 2800 2050 60 0001 C CNN F 3 "" H 2800 2050 60 0000 C CNN 1 3300 1850 1 0 0 -1 $EndComp Text GLabel 10600 4100 0 60 Output ~ 0 RESET Text GLabel 3950 1550 2 60 Input ~ 0 RESET Text GLabel 10600 4000 0 60 Output ~ 0 PHI2 Text GLabel 3950 2450 2 60 Input ~ 0 PHI2 NoConn ~ 10600 4200 $Comp L 74LS138 U3 U 1 1 590F5A10 P 3300 3800 F 0 "U3" H 3400 4300 50 0000 C CNN F 1 "74LS138" H 3450 3251 50 0000 C CNN F 2 "Housings_DIP:DIP-16_W7.62mm_Socket" H 3300 3800 50 0001 C CNN F 3 "" H 3300 3800 50 0001 C CNN 1 3300 3800 1 0 0 -1 $EndComp Text GLabel 10600 4500 0 60 Output ~ 0 RW Text GLabel 3950 2850 2 60 Input ~ 0 RW Text GLabel 2700 3550 0 60 Input ~ 0 A13 Text GLabel 2700 3650 0 60 Input ~ 0 A14 Text GLabel 2700 3950 0 60 Input ~ 0 A15 Text GLabel 2400 4300 3 60 Output ~ 0 GND NoConn ~ 3900 3450 NoConn ~ 3900 3550 NoConn ~ 3900 3650 NoConn ~ 3900 3750 NoConn ~ 3900 3850 NoConn ~ 3900 4050 NoConn ~ 3900 4150 Text GLabel 2650 2850 0 60 Input ~ 0 VCC Text GLabel 3950 950 2 60 Input ~ 0 KBD_STROBE Text GLabel 3950 1050 2 60 Output ~ 0 KBD_READY NoConn ~ 3950 1150 NoConn ~ 3950 1250 Text GLabel 2650 950 0 60 Output ~ 0 GND Text GLabel 4450 2400 1 60 Input ~ 0 VCC Text GLabel 3950 2750 2 60 Input ~ 0 A4 NoConn ~ 10600 3500 NoConn ~ 10600 3400 NoConn ~ 10600 3200 NoConn ~ 10600 3100 NoConn ~ 10600 3000 NoConn ~ 10600 2900 NoConn ~ 10600 2800 NoConn ~ 10600 2700 NoConn ~ 10600 2600 $Comp L 74HCT04 U1 U 1 1 590F843D P 1850 2750 F 0 "U1" H 2000 2850 50 0000 C CNN F 1 "74HCT04" H 2050 2650 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 1850 2750 50 0001 C CNN F 3 "" H 1850 2750 50 0001 C CNN 1 1850 2750 -1 0 0 1 $EndComp $Comp L CP1 C4 U 1 1 590F85AC P 1250 2750 F 0 "C4" H 1275 2850 50 0000 L CNN F 1 "10nF" H 1275 2650 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 1250 2750 50 0001 C CNN F 3 "" H 1250 2750 50 0001 C CNN 1 1250 2750 0 -1 -1 0 $EndComp Text GLabel 2650 2650 0 60 Input ~ 0 OUT_RDA Text GLabel 950 2550 0 60 Output ~ 0 OUT_DA Text GLabel 2650 1050 0 60 Input ~ 0 KBD_D0 Text GLabel 2650 1150 0 60 Input ~ 0 KBD_D1 Text GLabel 2650 1250 0 60 Input ~ 0 KBD_D2 Text GLabel 2650 1350 0 60 Input ~ 0 KBD_D3 Text GLabel 2650 1450 0 60 Input ~ 0 KBD_D4 Text GLabel 2650 1550 0 60 Input ~ 0 KBD_D5 Text GLabel 2650 1650 0 60 Input ~ 0 KBD_D6 Text GLabel 2650 1850 0 60 Output ~ 0 OUT_D0 Text GLabel 2650 1950 0 60 Output ~ 0 OUT_D1 Text GLabel 2650 2050 0 60 Output ~ 0 OUT_D2 Text GLabel 2650 2150 0 60 Output ~ 0 OUT_D3 Text GLabel 2650 2250 0 60 Output ~ 0 OUT_D4 Text GLabel 2650 2350 0 60 Output ~ 0 OUT_D5 Text GLabel 2650 2450 0 60 Output ~ 0 OUT_D6 $Comp L MCP23S17 U4 U 1 1 5910D88B P 5700 1800 F 0 "U4" H 5600 2825 50 0000 R CNN F 1 "MCP23S17" H 5600 2750 50 0000 R CNN F 2 "Housings_DIP:DIP-28_W7.62mm_Socket" H 5750 850 50 0001 L CNN F 3 "" H 5950 2800 50 0001 C CNN 1 5700 1800 1 0 0 -1 $EndComp Text GLabel 5200 1900 0 60 Input ~ 0 OUT_D0 Text GLabel 5200 2000 0 60 Input ~ 0 OUT_D1 Text GLabel 5200 2100 0 60 Input ~ 0 OUT_D2 Text GLabel 5200 2200 0 60 Input ~ 0 OUT_D3 Text GLabel 5200 2300 0 60 Input ~ 0 OUT_D4 Text GLabel 5200 2400 0 60 Input ~ 0 OUT_D5 Text GLabel 5200 2500 0 60 Input ~ 0 OUT_D6 Text GLabel 6450 2400 2 60 Output ~ 0 GND Text GLabel 5700 800 1 60 Input ~ 0 VCC $Comp L Arduino_Nano_Header J2 U 1 1 59110A3B P 7750 1700 F 0 "J2" H 7750 2500 60 0000 C CNN F 1 "Arduino_Nano_Header" H 7750 900 60 0000 C CNN F 2 "Modules:Arduino_Nano" H 7750 1700 60 0001 C CNN F 3 "" H 7750 1700 60 0000 C CNN 1 7750 1700 1 0 0 -1 $EndComp Text GLabel 8250 1100 2 60 Output ~ 0 GND Text GLabel 9000 1450 2 60 Output ~ 0 VCC $Comp L R R3 U 1 1 59112B96 P 7750 3250 F 0 "R3" V 7830 3250 50 0000 C CNN F 1 "10k" V 7750 3250 50 0000 C CNN F 2 "Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7680 3250 50 0001 C CNN F 3 "" H 7750 3250 50 0001 C CNN 1 7750 3250 0 1 1 0 $EndComp $Comp L SW_Push SW1 U 1 1 59115E08 P 8800 1200 F 0 "SW1" H 8850 1300 50 0000 L CNN F 1 "Reset" H 8800 1140 50 0000 C CNN F 2 "Buttons_Switches_THT:SW_PUSH_6mm" H 8800 1400 50 0001 C CNN F 3 "" H 8800 1400 50 0001 C CNN 1 8800 1200 1 0 0 -1 $EndComp Text GLabel 9250 1200 2 60 Output ~ 0 GND Wire Wire Line 10025 1650 10025 1475 Wire Wire Line 10025 1475 10875 1475 Wire Wire Line 10275 1475 10275 1375 Connection ~ 10275 1475 Wire Wire Line 10025 975 10875 975 Wire Wire Line 10025 975 10025 825 Wire Wire Line 10275 975 10275 1075 Connection ~ 10275 975 Wire Wire Line 10575 975 10575 1075 Wire Wire Line 10575 1475 10575 1375 Wire Wire Line 10875 975 10875 1075 Connection ~ 10575 975 Wire Wire Line 10875 1475 10875 1375 Connection ~ 10575 1475 Wire Wire Line 3900 3950 4450 3950 Wire Wire Line 4450 3950 4450 2650 Wire Wire Line 4450 2650 3950 2650 Wire Wire Line 2700 4050 2400 4050 Wire Wire Line 2400 4050 2400 4300 Wire Wire Line 2700 4150 2400 4150 Connection ~ 2400 4150 Wire Wire Line 4450 2400 4450 2550 Wire Wire Line 4450 2550 3950 2550 Wire Wire Line 2300 2750 2650 2750 Wire Wire Line 950 2550 2650 2550 Wire Wire Line 1100 2750 1000 2750 Wire Wire Line 1000 2750 1000 2550 Connection ~ 1000 2550 Wire Wire Line 6200 2400 6450 2400 Wire Wire Line 6200 2500 6350 2500 Wire Wire Line 6350 2400 6350 2900 Connection ~ 6350 2400 Wire Wire Line 6350 2600 6200 2600 Connection ~ 6350 2500 Wire Wire Line 5700 2800 5700 2900 Wire Wire Line 5700 2900 6350 2900 Connection ~ 6350 2600 Wire Wire Line 8100 1200 8600 1200 Wire Wire Line 8250 1100 8100 1100 Wire Wire Line 6750 2400 7400 2400 Wire Wire Line 6200 2000 6950 2000 Wire Wire Line 6950 2000 6950 3800 Wire Wire Line 6950 2650 8250 2650 Wire Wire Line 8250 2650 8250 2400 Wire Wire Line 6200 1900 7050 1900 Wire Wire Line 9000 1200 9250 1200 $Comp L Jumper_NO_Small JP1 U 1 1 59116B95 P 8700 1450 F 0 "JP1" H 8700 1530 50 0000 C CNN F 1 "USB Power" H 8710 1390 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Angled_1x02_Pitch2.54mm" H 8700 1450 50 0001 C CNN F 3 "" H 8700 1450 50 0001 C CNN 1 8700 1450 1 0 0 -1 $EndComp Wire Wire Line 9000 1450 8800 1450 Wire Wire Line 8600 1450 8350 1450 Wire Wire Line 8350 1450 8350 1300 Wire Wire Line 8350 1300 8100 1300 Text GLabel 7400 1400 0 60 Input ~ 0 KBD_READY Text GLabel 7400 1600 0 60 Output ~ 0 KBD_STROBE Text GLabel 7400 1700 0 60 Output ~ 0 OUT_RDA Text GLabel 7400 1500 0 60 Input ~ 0 OUT_DA Text GLabel 5200 1000 0 60 Output ~ 0 KBD_D0 Text GLabel 5200 1100 0 60 Output ~ 0 KBD_D1 Text GLabel 5200 1200 0 60 Output ~ 0 KBD_D2 Text GLabel 5200 1300 0 60 Output ~ 0 KBD_D3 Text GLabel 5200 1400 0 60 Output ~ 0 KBD_D4 Text GLabel 5200 1500 0 60 Output ~ 0 KBD_D5 Text GLabel 5200 1600 0 60 Output ~ 0 KBD_D6 Text GLabel 5200 1700 0 60 Output ~ 0 KBD_D7 Wire Wire Line 6750 2200 6750 4000 Wire Wire Line 6750 2200 6200 2200 Wire Wire Line 6850 2300 7400 2300 Wire Wire Line 6850 2100 6850 3900 Wire Wire Line 6850 2100 6200 2100 Wire Wire Line 7050 2200 7400 2200 Wire Wire Line 7050 1900 7050 3250 Connection ~ 6950 2650 Connection ~ 6850 2300 Connection ~ 6750 2400 $Comp L R R2 U 1 1 59122A1C P 7750 3050 F 0 "R2" V 7830 3050 50 0000 C CNN F 1 "10k" V 7750 3050 50 0000 C CNN F 2 "Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7680 3050 50 0001 C CNN F 3 "" H 7750 3050 50 0001 C CNN 1 7750 3050 0 1 1 0 $EndComp Text GLabel 8100 3050 2 60 Input ~ 0 VCC Wire Wire Line 8100 3050 7900 3050 Wire Wire Line 8000 3250 7900 3250 Wire Wire Line 8000 2850 8000 3250 Connection ~ 8000 3050 Wire Wire Line 7150 2100 7400 2100 Wire Wire Line 7150 2100 7150 3700 Wire Wire Line 7150 3050 7600 3050 Wire Wire Line 7050 3250 7600 3250 Connection ~ 7050 2200 Wire Wire Line 8250 2400 8100 2400 $Comp L R R1 U 1 1 59123A38 P 7750 2850 F 0 "R1" V 7830 2850 50 0000 C CNN F 1 "10k" V 7750 2850 50 0000 C CNN F 2 "Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7680 2850 50 0001 C CNN F 3 "" H 7750 2850 50 0001 C CNN 1 7750 2850 0 1 1 0 $EndComp Wire Wire Line 7400 2000 7250 2000 Wire Wire Line 7250 2000 7250 3600 Wire Wire Line 7250 2850 7600 2850 Wire Wire Line 7900 2850 8000 2850 Connection ~ 7150 3050 Connection ~ 7250 2850 $Comp L CONN_01X05 J3 U 1 1 59124CBA P 7750 3800 F 0 "J3" H 7750 4100 50 0000 C CNN F 1 "SPI Breakout" V 7850 3800 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Straight_1x05_Pitch2.54mm" H 7750 3800 50 0001 C CNN F 3 "" H 7750 3800 50 0001 C CNN 1 7750 3800 1 0 0 -1 $EndComp Wire Wire Line 7250 3600 7550 3600 Wire Wire Line 7150 3700 7550 3700 Wire Wire Line 6950 3800 7550 3800 Wire Wire Line 6850 3900 7550 3900 Wire Wire Line 6750 4000 7550 4000 Text Label 7350 3600 0 60 ~ 0 CS1 Text Label 7350 3700 0 60 ~ 0 CS2 Text Label 7350 3800 0 60 ~ 0 SCK Text Label 7350 3900 0 60 ~ 0 MOSI Text Label 7350 4000 0 60 ~ 0 MISO Wire Wire Line 8550 1200 8550 800 Wire Wire Line 8550 800 6350 800 Wire Wire Line 6350 800 6350 1000 Wire Wire Line 6350 1000 6200 1000 Connection ~ 8550 1200 NoConn ~ 6200 1400 NoConn ~ 6200 1500 NoConn ~ 7400 1800 NoConn ~ 7400 1900 NoConn ~ 8100 2300 NoConn ~ 8100 2200 NoConn ~ 8100 2100 NoConn ~ 8100 2000 NoConn ~ 8100 1900 NoConn ~ 8100 1800 NoConn ~ 8100 1700 NoConn ~ 8100 1600 NoConn ~ 8100 1500 NoConn ~ 8100 1400 NoConn ~ 8100 1000 NoConn ~ 7400 1200 NoConn ~ 7400 1100 NoConn ~ 7400 1000 NoConn ~ 7400 1300 NoConn ~ 5200 2600 Text GLabel 2650 1750 0 60 Input ~ 0 KBD_D7 $EndSCHEMATC