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:RC6502 RAM-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 $Comp L HM62256BLP-7 U1 U 1 1 590A1931 P 1950 1775 F 0 "U1" H 1650 2675 50 0000 C CNN F 1 "HM62256BLP-7" V 1950 1800 50 0000 C CNN F 2 "Housings_DIP:DIP-28_W15.24mm_Socket" H 1950 1775 50 0001 C CIN F 3 "" H 1950 1775 50 0001 C CNN 1 1950 1775 1 0 0 -1 $EndComp Text GLabel 9100 4450 0 60 Input ~ 0 WR Text GLabel 9100 3750 0 60 Input ~ 0 GND Text GLabel 9100 3850 0 60 Input ~ 0 VCC Text GLabel 9100 2150 0 60 Input ~ 0 A15 Text GLabel 9100 2250 0 60 Input ~ 0 A14 Text GLabel 9100 2350 0 60 Input ~ 0 A13 Text GLabel 9100 2450 0 60 Input ~ 0 A12 Text GLabel 9100 2550 0 60 Input ~ 0 A11 Text GLabel 9100 2650 0 60 Input ~ 0 A10 Text GLabel 9100 2750 0 60 Input ~ 0 A9 Text GLabel 9100 2850 0 60 Input ~ 0 A8 Text GLabel 9100 2950 0 60 Input ~ 0 A7 Text GLabel 9100 3050 0 60 Input ~ 0 A6 Text GLabel 9100 3150 0 60 Input ~ 0 A5 Text GLabel 9100 3250 0 60 Input ~ 0 A4 Text GLabel 9100 3350 0 60 Input ~ 0 A3 Text GLabel 9100 3450 0 60 Input ~ 0 A2 Text GLabel 9100 3550 0 60 Input ~ 0 A1 Text GLabel 9100 3650 0 60 Input ~ 0 A0 Text GLabel 9100 4750 0 60 Input ~ 0 D0 Text GLabel 9100 4850 0 60 Input ~ 0 D1 Text GLabel 9100 4950 0 60 Input ~ 0 D2 Text GLabel 9100 5050 0 60 Input ~ 0 D3 Text GLabel 9100 5150 0 60 Input ~ 0 D4 Text GLabel 9100 5250 0 60 Input ~ 0 D5 Text GLabel 9100 5350 0 60 Input ~ 0 D6 Text GLabel 9100 5450 0 60 Input ~ 0 D7 Text GLabel 2750 1875 2 60 Input ~ 0 CS Text GLabel 2450 1025 2 60 Input ~ 0 D0 Text GLabel 2450 1125 2 60 Input ~ 0 D1 Text GLabel 2450 1225 2 60 Input ~ 0 D2 Text GLabel 2450 1325 2 60 Input ~ 0 D3 Text GLabel 2450 1425 2 60 Input ~ 0 D4 Text GLabel 2450 1525 2 60 Input ~ 0 D5 Text GLabel 2450 1625 2 60 Input ~ 0 D6 Text GLabel 2450 1725 2 60 Input ~ 0 D7 NoConn ~ 9100 5750 NoConn ~ 9100 4050 NoConn ~ 9100 4150 NoConn ~ 9100 4250 NoConn ~ 9100 4650 NoConn ~ 9100 5550 NoConn ~ 9100 5650 Text GLabel 7850 2950 1 60 Input ~ 0 VCC Text GLabel 7625 4075 0 60 Output ~ 0 PAGE_EN Text GLabel 8425 5850 0 60 Output ~ 0 PAGE Text GLabel 8025 4075 2 60 Input ~ 0 PAGE $Comp L R R1 U 1 1 590BED30 P 7850 3250 F 0 "R1" V 7930 3250 50 0000 C CNN F 1 "10k" V 7850 3250 50 0000 C CNN F 2 "Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7780 3250 50 0001 C CNN F 3 "" H 7850 3250 50 0001 C CNN 1 7850 3250 1 0 0 -1 $EndComp $Comp L CONN_01X02 J1 U 1 1 590C6113 P 8050 3575 F 0 "J1" H 8050 3725 50 0000 C CNN F 1 "Page PullUp" V 8150 3575 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Angled_1x02_Pitch2.54mm" H 8050 3575 50 0001 C CNN F 3 "" H 8050 3575 50 0001 C CNN 1 8050 3575 1 0 0 -1 $EndComp Text GLabel 1450 2425 0 60 Input ~ 0 A14 Text GLabel 1450 2325 0 60 Input ~ 0 A13 Text GLabel 1450 2225 0 60 Input ~ 0 A12 Text GLabel 1450 2125 0 60 Input ~ 0 A11 Text GLabel 1450 2025 0 60 Input ~ 0 A10 Text GLabel 1450 1925 0 60 Input ~ 0 A9 Text GLabel 1450 1825 0 60 Input ~ 0 A8 Text GLabel 1450 1725 0 60 Input ~ 0 A7 Text GLabel 1450 1625 0 60 Input ~ 0 A6 Text GLabel 1450 1525 0 60 Input ~ 0 A5 Text GLabel 1450 1425 0 60 Input ~ 0 A4 Text GLabel 1450 1325 0 60 Input ~ 0 A3 Text GLabel 1450 1225 0 60 Input ~ 0 A2 Text GLabel 1450 1125 0 60 Input ~ 0 A1 Text GLabel 1450 1025 0 60 Input ~ 0 A0 Text Notes 8375 7500 2 60 ~ 0 RC6502 Pageable RAM Text Notes 10625 7650 2 60 ~ 0 A NoConn ~ -500 7850 $Comp L CONN_01X39 J3 U 1 1 590B4CA1 P 9300 4050 F 0 "J3" H 9300 6050 50 0000 C CNN F 1 "CONN_01X39" V 9400 4050 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Angled_1x39_Pitch2.54mm" H 9300 4050 50 0001 C CNN F 3 "" H 9300 4050 50 0001 C CNN 1 9300 4050 1 0 0 -1 $EndComp $Comp L CONN_01X02 J2 U 1 1 590B8522 P 8625 5650 F 0 "J2" H 8625 5800 50 0000 C CNN F 1 "Bus enable" V 8725 5650 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Angled_1x02_Pitch2.54mm" H 8625 5650 50 0001 C CNN F 3 "" H 8625 5650 50 0001 C CNN 1 8625 5650 0 -1 -1 0 $EndComp NoConn ~ 9100 5950 Text GLabel 9100 3950 0 60 Output ~ 0 PHI2 $Comp L 74HCT00 U2 U 3 1 590BA5CE P 4875 1425 F 0 "U2" H 4875 1475 50 0000 C CNN F 1 "74HCT00" H 4875 1325 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 4875 1425 50 0001 C CNN F 3 "" H 4875 1425 50 0001 C CNN 3 4875 1425 -1 0 0 1 $EndComp Text GLabel 6875 1325 2 60 Input ~ 0 WR $Comp L 74HCT00 U2 U 4 1 590BAFC8 P 6075 1325 F 0 "U2" H 6075 1375 50 0000 C CNN F 1 "74HCT00" H 6075 1225 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 6075 1325 50 0001 C CNN F 3 "" H 6075 1325 50 0001 C CNN 4 6075 1325 -1 0 0 1 $EndComp Text GLabel 5475 1525 2 60 Input ~ 0 PHI2 NoConn ~ 9100 4350 NoConn ~ 9100 4550 $Comp L C C1 U 1 1 590DFF39 P 8150 1375 F 0 "C1" H 8175 1475 50 0000 L CNN F 1 "100nF" H 8175 1275 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 8188 1225 50 0001 C CNN F 3 "" H 8150 1375 50 0001 C CNN 1 8150 1375 1 0 0 -1 $EndComp $Comp L C C2 U 1 1 590E0960 P 8450 1375 F 0 "C2" H 8475 1475 50 0000 L CNN F 1 "100nF" H 8475 1275 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 8488 1225 50 0001 C CNN F 3 "" H 8450 1375 50 0001 C CNN 1 8450 1375 1 0 0 -1 $EndComp Text GLabel 7900 975 1 60 Input ~ 0 VCC Text GLabel 7900 1800 3 60 Input ~ 0 GND $Comp L 74HCT00 U2 U 1 1 590E8553 P 3925 3050 F 0 "U2" H 3925 3100 50 0000 C CNN F 1 "74HCT00" H 3925 2950 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 3925 3050 50 0001 C CNN F 3 "" H 3925 3050 50 0001 C CNN 1 3925 3050 -1 0 0 1 $EndComp Wire Wire Line 8675 5850 9100 5850 Wire Wire Line 7625 4075 8025 4075 Wire Wire Line 7850 3625 7850 4075 Connection ~ 7850 4075 Wire Wire Line 7850 3525 7850 3400 Wire Wire Line 7850 3100 7850 2950 Wire Wire Line 2450 1975 3100 1975 Wire Wire Line 6875 1325 6775 1325 Wire Wire Line 6775 1225 6775 1425 Wire Wire Line 6775 1225 6675 1225 Wire Wire Line 6775 1425 6675 1425 Connection ~ 6775 1325 Wire Wire Line 2450 1875 2750 1875 Wire Wire Line 2600 1875 2600 2125 Wire Wire Line 2600 2125 2450 2125 Connection ~ 2600 1875 Wire Wire Line 7900 1800 7900 1625 Wire Wire Line 7900 1625 8450 1625 Wire Wire Line 8150 1625 8150 1525 Connection ~ 8150 1625 Wire Wire Line 7900 1125 8450 1125 Wire Wire Line 7900 1125 7900 975 Wire Wire Line 8150 1125 8150 1225 Connection ~ 8150 1125 Text GLabel 4275 1425 0 60 Output ~ 0 WE Text GLabel 3100 1975 2 60 Input ~ 0 WE Text GLabel 3875 2200 0 60 Output ~ 0 CS_LO Text GLabel 4275 2200 2 60 Input ~ 0 A15 Wire Wire Line 4275 2200 3875 2200 Wire Wire Line 8575 5850 8425 5850 Text GLabel 3325 3050 0 60 Output ~ 0 CS_HI Text GLabel 4525 2950 2 60 Input ~ 0 A15 $Comp L 74HCT00 U2 U 2 1 59101296 P 5225 3150 F 0 "U2" H 5225 3200 50 0000 C CNN F 1 "74HCT00" H 5225 3050 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 5225 3150 50 0001 C CNN F 3 "" H 5225 3150 50 0001 C CNN 2 5225 3150 -1 0 0 1 $EndComp Wire Wire Line 4525 3150 4625 3150 Wire Wire Line 5925 3250 5825 3250 Wire Wire Line 5925 3050 5925 3250 Wire Wire Line 5925 3050 5825 3050 Wire Wire Line 6050 3150 5925 3150 Connection ~ 5925 3150 Text GLabel 6050 3150 2 60 Input ~ 0 PAGE_EN $Comp L Jumper_NC_Dual JP1 U 1 1 5910854D P 2975 4275 F 0 "JP1" H 3025 4175 50 0000 L CNN F 1 "HIGH | LOW" H 2975 4375 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Angled_1x03_Pitch2.54mm" H 2975 4275 50 0001 C CNN F 3 "" H 2975 4275 50 0001 C CNN 1 2975 4275 0 1 1 0 $EndComp Text GLabel 2675 4275 0 60 Output ~ 0 CS Wire Wire Line 2875 4275 2675 4275 Text GLabel 2975 4525 3 60 Input ~ 0 CS_HI Text GLabel 2975 4025 1 60 Input ~ 0 CS_LO Wire Wire Line 8450 1125 8450 1225 Wire Wire Line 8450 1625 8450 1525 $EndSCHEMATC