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_backplane 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 10300 4450 0 60 Output ~ 0 R/~W Text GLabel 10300 2150 0 60 Output ~ 0 A15 Text GLabel 10300 2250 0 60 Output ~ 0 A14 Text GLabel 10300 2350 0 60 Output ~ 0 A13 Text GLabel 10300 2450 0 60 Output ~ 0 A12 Text GLabel 10300 2550 0 60 Output ~ 0 A11 Text GLabel 10300 2650 0 60 Output ~ 0 A10 Text GLabel 10300 2750 0 60 Output ~ 0 A9 Text GLabel 10300 2850 0 60 Output ~ 0 A8 Text GLabel 10300 2950 0 60 Output ~ 0 A7 Text GLabel 10300 3050 0 60 Output ~ 0 A6 Text GLabel 10300 3150 0 60 Output ~ 0 A5 Text GLabel 10300 3250 0 60 Output ~ 0 A4 Text GLabel 10300 3350 0 60 Output ~ 0 A3 Text GLabel 10300 3450 0 60 Output ~ 0 A2 Text GLabel 10300 3550 0 60 Output ~ 0 A1 Text GLabel 10300 3650 0 60 Output ~ 0 A0 Text GLabel 10300 4750 0 60 BiDi ~ 0 D0 Text GLabel 10300 4850 0 60 BiDi ~ 0 D1 Text GLabel 10300 4950 0 60 BiDi ~ 0 D2 Text GLabel 10300 5050 0 60 BiDi ~ 0 D3 Text GLabel 10300 5150 0 60 BiDi ~ 0 D4 Text GLabel 10300 5250 0 60 BiDi ~ 0 D5 Text GLabel 10300 5350 0 60 BiDi ~ 0 D6 Text GLabel 10300 5450 0 60 BiDi ~ 0 D7 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 ~ 10300 5750 NoConn ~ 10300 4050 NoConn ~ 10300 4150 NoConn ~ 10300 4250 NoConn ~ 10300 4650 NoConn ~ 10300 5550 NoConn ~ 10300 5650 Text GLabel 800 2500 0 60 Input ~ 0 A14 Text GLabel 800 2250 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 8950 7500 2 60 ~ 0 RC6502 Enhanced RAM/ROM board Text Notes 10625 7650 2 60 ~ 0 B Text GLabel 10300 3950 0 60 Output ~ 0 PHI2 NoConn ~ 10300 4350 NoConn ~ 10300 4550 $Comp L C C2 U 1 1 590DFF39 P 9950 1100 F 0 "C2" H 9975 1200 50 0000 L CNN F 1 "100nF" H 9975 1000 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 9988 950 50 0001 C CNN F 3 "" H 9950 1100 50 0001 C CNN 1 9950 1100 1 0 0 -1 $EndComp $Comp L C C3 U 1 1 590E0960 P 10250 1100 F 0 "C3" H 10275 1200 50 0000 L CNN F 1 "100nF" H 10275 1000 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 10288 950 50 0001 C CNN F 3 "" H 10250 1100 50 0001 C CNN 1 10250 1100 1 0 0 -1 $EndComp $Comp L 74LS138 U2 U 1 1 5C1D1CBA P 1575 6975 F 0 "U2" H 1675 7475 50 0000 C CNN F 1 "74LS138" H 1725 6426 50 0000 C CNN F 2 "Housings_DIP:DIP-16_W7.62mm_Socket" H 1575 6975 50 0001 C CNN F 3 "" H 1575 6975 50 0001 C CNN 1 1575 6975 1 0 0 -1 $EndComp Text GLabel 975 6825 0 60 Input ~ 0 A14 Text GLabel 975 6725 0 60 Input ~ 0 A13 Text GLabel 975 6625 0 60 Input ~ 0 A12 $Comp L RC6502_Backplane J3 U 1 1 5C1D21CF P 10500 4050 F 0 "J3" H 10500 6050 50 0000 C CNN F 1 "RC6502_Backplane" V 10950 4000 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Angled_1x39_Pitch2.54mm" H 10500 4050 50 0001 C CNN F 3 "" H 10500 4050 50 0001 C CNN 1 10500 4050 1 0 0 -1 $EndComp $Comp L GND #PWR01 U 1 1 5C1D31C0 P 9875 3825 F 0 "#PWR01" H 9875 3575 50 0001 C CNN F 1 "GND" H 9875 3675 50 0000 C CNN F 2 "" H 9875 3825 50 0001 C CNN F 3 "" H 9875 3825 50 0001 C CNN 1 9875 3825 1 0 0 -1 $EndComp Wire Wire Line 9875 3825 9875 3750 Wire Wire Line 9875 3750 10300 3750 $Comp L VCC #PWR02 U 1 1 5C1D3205 P 10000 3675 F 0 "#PWR02" H 10000 3525 50 0001 C CNN F 1 "VCC" H 10000 3825 50 0000 C CNN F 2 "" H 10000 3675 50 0001 C CNN F 3 "" H 10000 3675 50 0001 C CNN 1 10000 3675 1 0 0 -1 $EndComp Wire Wire Line 10000 3675 10000 3850 Wire Wire Line 10000 3850 10300 3850 $Comp L GND #PWR03 U 1 1 5C1D346F P 10850 1400 F 0 "#PWR03" H 10850 1150 50 0001 C CNN F 1 "GND" H 10850 1250 50 0000 C CNN F 2 "" H 10850 1400 50 0001 C CNN F 3 "" H 10850 1400 50 0001 C CNN 1 10850 1400 1 0 0 -1 $EndComp $Comp L VCC #PWR04 U 1 1 5C1D3492 P 9650 800 F 0 "#PWR04" H 9650 650 50 0001 C CNN F 1 "VCC" H 9650 950 50 0000 C CNN F 2 "" H 9650 800 50 0001 C CNN F 3 "" H 9650 800 50 0001 C CNN 1 9650 800 1 0 0 -1 $EndComp $Comp L GND #PWR05 U 1 1 5C1D39F4 P 900 7400 F 0 "#PWR05" H 900 7150 50 0001 C CNN F 1 "GND" H 900 7250 50 0000 C CNN F 2 "" H 900 7400 50 0001 C CNN F 3 "" H 900 7400 50 0001 C CNN 1 900 7400 1 0 0 -1 $EndComp Wire Wire Line 900 7225 900 7400 Wire Wire Line 900 7325 975 7325 Text GLabel 975 7125 0 60 Input ~ 0 E3 Text GLabel 3325 1325 0 60 Output ~ 0 E3 Text GLabel 5175 1325 2 60 Input ~ 0 A15 Wire Wire Line 900 7225 975 7225 Connection ~ 900 7325 $Comp L 74LS00 U5 U 1 1 5C1D4C2B P 4350 1650 F 0 "U5" H 4350 1700 50 0000 C CNN F 1 "74LS00" H 4350 1550 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 4350 1650 50 0001 C CNN F 3 "" H 4350 1650 50 0001 C CNN 1 4350 1650 -1 0 0 1 $EndComp Wire Wire Line 4950 1550 5025 1550 Wire Wire Line 5025 1550 5025 1750 Wire Wire Line 5025 1750 4950 1750 Wire Wire Line 5100 1650 5025 1650 Connection ~ 5025 1650 $Comp L 74LS00 U5 U 3 1 5C1D58A3 P 8225 850 F 0 "U5" H 8225 900 50 0000 C CNN F 1 "74LS00" H 8225 750 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 8225 850 50 0001 C CNN F 3 "" H 8225 850 50 0001 C CNN 3 8225 850 -1 0 0 1 $EndComp Text GLabel 8975 950 2 60 Input ~ 0 R/~W $Comp L 74LS00 U5 U 4 1 5C1D5B01 P 8225 1350 F 0 "U5" H 8225 1400 50 0000 C CNN F 1 "74LS00" H 8225 1250 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 8225 1350 50 0001 C CNN F 3 "" H 8225 1350 50 0001 C CNN 4 8225 1350 -1 0 0 1 $EndComp $Comp L 74LS00 U5 U 2 1 5C1D5B4B P 6950 1450 F 0 "U5" H 6950 1500 50 0000 C CNN F 1 "74LS00" H 6950 1350 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 6950 1450 50 0001 C CNN F 3 "" H 6950 1450 50 0001 C CNN 2 6950 1450 -1 0 0 1 $EndComp Text GLabel 8975 750 2 60 Input ~ 0 PHI2 Wire Wire Line 8825 950 8975 950 Wire Wire Line 8900 950 8900 1450 Wire Wire Line 8900 1450 8825 1450 Connection ~ 8900 950 Wire Wire Line 8825 1250 8900 1250 Connection ~ 8900 1250 Wire Wire Line 8975 750 8825 750 Text GLabel 7625 850 0 60 Output ~ 0 ~OE Wire Wire Line 7550 1350 7625 1350 Text GLabel 7625 1550 2 60 Input ~ 0 PHI2 Wire Wire Line 7550 1550 7625 1550 Text GLabel 6025 1275 1 60 Output ~ 0 ~WE Wire Wire Line 6275 1450 6350 1450 $Comp L Jumper_NC_Dual JP11 U 1 1 5C1D6754 P 6025 1450 F 0 "JP11" H 6075 1350 50 0000 L CNN F 1 "MEM_WE" H 6025 1550 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 6025 1450 50 0001 C CNN F 3 "" H 6025 1450 50 0001 C CNN 1 6025 1450 -1 0 0 1 $EndComp Wire Wire Line 6025 1275 6025 1350 $Comp L VCC #PWR06 U 1 1 5C1D6EEC P 5700 1375 F 0 "#PWR06" H 5700 1225 50 0001 C CNN F 1 "VCC" H 5700 1525 50 0000 C CNN F 2 "" H 5700 1375 50 0001 C CNN F 3 "" H 5700 1375 50 0001 C CNN 1 5700 1375 1 0 0 -1 $EndComp Wire Wire Line 5700 1375 5700 1450 Wire Wire Line 5700 1450 5775 1450 Text GLabel 2525 1875 2 60 Input ~ 0 ~OE Wire Wire Line 2525 1875 2450 1875 Text GLabel 2525 1975 2 60 Input ~ 0 ~WE Wire Wire Line 2525 1975 2450 1975 Text GLabel 2525 2125 2 60 Input ~ 0 ~CS Wire Wire Line 2450 2125 2525 2125 $Comp L Jumper_NC_Small JP1 U 1 1 5C1D8121 P 975 2250 F 0 "JP1" H 975 2330 50 0000 C CNN F 1 "A13_EN" H 985 2190 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm" H 975 2250 50 0001 C CNN F 3 "" H 975 2250 50 0001 C CNN 1 975 2250 -1 0 0 1 $EndComp $Comp L Jumper_NC_Small JP2 U 1 1 5C1D81B4 P 975 2500 F 0 "JP2" H 975 2580 50 0000 C CNN F 1 "A14_EN" H 985 2440 50 0000 C CNN F 2 "Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm" H 975 2500 50 0001 C CNN F 3 "" H 975 2500 50 0001 C CNN 1 975 2500 -1 0 0 1 $EndComp Wire Wire Line 1150 2425 1450 2425 Wire Wire Line 1150 2325 1450 2325 Wire Wire Line 800 2250 875 2250 Wire Wire Line 800 2500 875 2500 Wire Wire Line 1150 2250 1150 2325 Wire Wire Line 1150 2425 1150 2500 Wire Wire Line 1150 2250 1075 2250 Wire Wire Line 1150 2500 1075 2500 $Comp L Jumper_NC_Dual JP3 U 1 1 5C1D94D7 P 1800 5200 F 0 "JP3" H 1850 5100 50 0000 L CNN F 1 "CS0_EN" H 1800 5300 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 1800 5200 50 0001 C CNN F 3 "" H 1800 5200 50 0001 C CNN 1 1800 5200 -1 0 0 1 $EndComp Text GLabel 2250 6625 2 60 Output ~ 0 ~CS0 Text GLabel 2250 6725 2 60 Output ~ 0 ~CS1 Text GLabel 2250 6825 2 60 Output ~ 0 ~CS2 Text GLabel 2250 6925 2 60 Output ~ 0 ~CS3 Text GLabel 2250 7025 2 60 Output ~ 0 ~CS4 Text GLabel 2250 7125 2 60 Output ~ 0 ~CS5 Text GLabel 2250 7225 2 60 Output ~ 0 ~CS6 Text GLabel 2250 7325 2 60 Output ~ 0 ~CS7 Wire Wire Line 2175 6625 2250 6625 Wire Wire Line 2175 6725 2250 6725 Wire Wire Line 2175 6825 2250 6825 Wire Wire Line 2175 6925 2250 6925 Wire Wire Line 2175 7025 2250 7025 Wire Wire Line 2175 7125 2250 7125 Wire Wire Line 2175 7225 2250 7225 Wire Wire Line 2175 7325 2250 7325 Text GLabel 1475 5200 0 60 Input ~ 0 ~CS0 Wire Wire Line 1550 5200 1475 5200 $Comp L VCC #PWR07 U 1 1 5C1DA5C2 P 2125 5125 F 0 "#PWR07" H 2125 4975 50 0001 C CNN F 1 "VCC" H 2125 5275 50 0000 C CNN F 2 "" H 2125 5125 50 0001 C CNN F 3 "" H 2125 5125 50 0001 C CNN 1 2125 5125 1 0 0 -1 $EndComp Wire Wire Line 2125 5200 2050 5200 Wire Wire Line 2125 5125 2125 5200 Wire Wire Line 1800 5100 1800 4850 Wire Wire Line 1800 4850 2025 4850 Wire Wire Line 2025 4850 2025 4775 $Comp L Jumper_NC_Dual JP4 U 1 1 5C1DB001 P 2225 5475 F 0 "JP4" H 2275 5375 50 0000 L CNN F 1 "CS1_EN" H 2225 5575 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 2225 5475 50 0001 C CNN F 3 "" H 2225 5475 50 0001 C CNN 1 2225 5475 -1 0 0 1 $EndComp Text GLabel 1900 5475 0 60 Input ~ 0 ~CS1 Wire Wire Line 1975 5475 1900 5475 $Comp L VCC #PWR08 U 1 1 5C1DB009 P 2550 5400 F 0 "#PWR08" H 2550 5250 50 0001 C CNN F 1 "VCC" H 2550 5550 50 0000 C CNN F 2 "" H 2550 5400 50 0001 C CNN F 3 "" H 2550 5400 50 0001 C CNN 1 2550 5400 1 0 0 -1 $EndComp Wire Wire Line 2550 5475 2475 5475 Wire Wire Line 2550 5400 2550 5475 Wire Wire Line 2225 4775 2225 5375 $Comp L Jumper_NC_Dual JP5 U 1 1 5C1DB802 P 2650 5750 F 0 "JP5" H 2700 5650 50 0000 L CNN F 1 "CS2_EN" H 2650 5850 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 2650 5750 50 0001 C CNN F 3 "" H 2650 5750 50 0001 C CNN 1 2650 5750 -1 0 0 1 $EndComp Text GLabel 2325 5750 0 60 Input ~ 0 ~CS2 Wire Wire Line 2400 5750 2325 5750 $Comp L VCC #PWR09 U 1 1 5C1DB80A P 2975 5675 F 0 "#PWR09" H 2975 5525 50 0001 C CNN F 1 "VCC" H 2975 5825 50 0000 C CNN F 2 "" H 2975 5675 50 0001 C CNN F 3 "" H 2975 5675 50 0001 C CNN 1 2975 5675 1 0 0 -1 $EndComp Wire Wire Line 2975 5750 2900 5750 Wire Wire Line 2975 5675 2975 5750 Wire Wire Line 2650 5650 2650 5400 Wire Wire Line 2875 5400 2875 5325 $Comp L Jumper_NC_Dual JP6 U 1 1 5C1DB81B P 3075 6025 F 0 "JP6" H 3125 5925 50 0000 L CNN F 1 "CS3_EN" H 3075 6125 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 3075 6025 50 0001 C CNN F 3 "" H 3075 6025 50 0001 C CNN 1 3075 6025 -1 0 0 1 $EndComp Text GLabel 2750 6025 0 60 Input ~ 0 ~CS3 Wire Wire Line 2825 6025 2750 6025 $Comp L VCC #PWR010 U 1 1 5C1DB823 P 3400 5950 F 0 "#PWR010" H 3400 5800 50 0001 C CNN F 1 "VCC" H 3400 6100 50 0000 C CNN F 2 "" H 3400 5950 50 0001 C CNN F 3 "" H 3400 5950 50 0001 C CNN 1 3400 5950 1 0 0 -1 $EndComp Wire Wire Line 3400 6025 3325 6025 Wire Wire Line 3400 5950 3400 6025 Wire Wire Line 3075 5325 3075 5925 Wire Wire Line 2650 5400 2875 5400 $Comp L Jumper_NC_Dual JP7 U 1 1 5C1DC554 P 3475 6300 F 0 "JP7" H 3525 6200 50 0000 L CNN F 1 "CS4_EN" H 3475 6400 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 3475 6300 50 0001 C CNN F 3 "" H 3475 6300 50 0001 C CNN 1 3475 6300 -1 0 0 1 $EndComp Text GLabel 3150 6300 0 60 Input ~ 0 ~CS4 Wire Wire Line 3225 6300 3150 6300 $Comp L VCC #PWR011 U 1 1 5C1DC55C P 3800 6225 F 0 "#PWR011" H 3800 6075 50 0001 C CNN F 1 "VCC" H 3800 6375 50 0000 C CNN F 2 "" H 3800 6225 50 0001 C CNN F 3 "" H 3800 6225 50 0001 C CNN 1 3800 6225 1 0 0 -1 $EndComp Wire Wire Line 3800 6300 3725 6300 Wire Wire Line 3800 6225 3800 6300 Wire Wire Line 3475 6200 3475 5950 Wire Wire Line 3475 5950 3700 5950 Wire Wire Line 3700 5950 3700 5875 $Comp L Jumper_NC_Dual JP8 U 1 1 5C1DC56D P 3900 6575 F 0 "JP8" H 3950 6475 50 0000 L CNN F 1 "CS5_EN" H 3900 6675 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 3900 6575 50 0001 C CNN F 3 "" H 3900 6575 50 0001 C CNN 1 3900 6575 -1 0 0 1 $EndComp Text GLabel 3575 6575 0 60 Input ~ 0 ~CS5 Wire Wire Line 3650 6575 3575 6575 $Comp L VCC #PWR012 U 1 1 5C1DC575 P 4225 6500 F 0 "#PWR012" H 4225 6350 50 0001 C CNN F 1 "VCC" H 4225 6650 50 0000 C CNN F 2 "" H 4225 6500 50 0001 C CNN F 3 "" H 4225 6500 50 0001 C CNN 1 4225 6500 1 0 0 -1 $EndComp Wire Wire Line 4225 6575 4150 6575 Wire Wire Line 4225 6500 4225 6575 Wire Wire Line 3900 5875 3900 6475 $Comp L Jumper_NC_Dual JP12 U 1 1 5C1DC57E P 4325 6850 F 0 "JP12" H 4375 6750 50 0000 L CNN F 1 "CS6_EN" H 4325 6950 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 4325 6850 50 0001 C CNN F 3 "" H 4325 6850 50 0001 C CNN 1 4325 6850 -1 0 0 1 $EndComp Text GLabel 4000 6850 0 60 Input ~ 0 ~CS6 Wire Wire Line 4075 6850 4000 6850 $Comp L VCC #PWR013 U 1 1 5C1DC586 P 4650 6775 F 0 "#PWR013" H 4650 6625 50 0001 C CNN F 1 "VCC" H 4650 6925 50 0000 C CNN F 2 "" H 4650 6775 50 0001 C CNN F 3 "" H 4650 6775 50 0001 C CNN 1 4650 6775 1 0 0 -1 $EndComp Wire Wire Line 4650 6850 4575 6850 Wire Wire Line 4650 6775 4650 6850 Wire Wire Line 4325 6750 4325 6500 Wire Wire Line 4550 6500 4550 6425 $Comp L Jumper_NC_Dual JP13 U 1 1 5C1DC596 P 4750 7125 F 0 "JP13" H 4800 7025 50 0000 L CNN F 1 "CS7_EN" H 4750 7225 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 4750 7125 50 0001 C CNN F 3 "" H 4750 7125 50 0001 C CNN 1 4750 7125 -1 0 0 1 $EndComp Text GLabel 4425 7125 0 60 Input ~ 0 ~CS7 Wire Wire Line 4500 7125 4425 7125 $Comp L VCC #PWR014 U 1 1 5C1DC59E P 5075 7050 F 0 "#PWR014" H 5075 6900 50 0001 C CNN F 1 "VCC" H 5075 7200 50 0000 C CNN F 2 "" H 5075 7050 50 0001 C CNN F 3 "" H 5075 7050 50 0001 C CNN 1 5075 7050 1 0 0 -1 $EndComp Wire Wire Line 5075 7125 5000 7125 Wire Wire Line 5075 7050 5075 7125 Wire Wire Line 4750 6425 4750 7025 Wire Wire Line 4325 6500 4550 6500 Wire Wire Line 2125 3475 2125 3575 Wire Wire Line 2975 3675 2975 4125 Wire Wire Line 2975 3675 3050 3675 Wire Wire Line 3050 3475 2125 3475 Wire Wire Line 3800 4575 3800 4675 Wire Wire Line 4725 4575 3800 4575 Wire Wire Line 4650 5225 4650 4775 Wire Wire Line 4650 4775 4725 4775 Wire Wire Line 5925 4675 6000 4675 Wire Wire Line 6000 4675 6000 4225 Wire Wire Line 6000 4225 6075 4225 Wire Wire Line 4250 3575 6000 3575 Wire Wire Line 6000 3575 6000 4025 Wire Wire Line 6000 4025 6075 4025 Text GLabel 7350 4125 2 60 Output ~ 0 ~CS Wire Wire Line 7275 4125 7350 4125 $Comp L C C1 U 1 1 5C1E1F71 P 9650 1100 F 0 "C1" H 9675 1200 50 0000 L CNN F 1 "100nF" H 9675 1000 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 9688 950 50 0001 C CNN F 3 "" H 9650 1100 50 0001 C CNN 1 9650 1100 1 0 0 -1 $EndComp $Comp L C C4 U 1 1 5C1E2346 P 10550 1100 F 0 "C4" H 10575 1200 50 0000 L CNN F 1 "100nF" H 10575 1000 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 10588 950 50 0001 C CNN F 3 "" H 10550 1100 50 0001 C CNN 1 10550 1100 1 0 0 -1 $EndComp Wire Wire Line 9650 1250 9650 1325 Wire Wire Line 9650 1325 10850 1325 Wire Wire Line 9950 1325 9950 1250 Wire Wire Line 10250 1325 10250 1250 Connection ~ 9950 1325 Connection ~ 10250 1325 Wire Wire Line 9650 800 9650 950 Wire Wire Line 9650 875 10850 875 Wire Wire Line 9950 875 9950 950 Wire Wire Line 10250 875 10250 950 Connection ~ 9950 875 Wire Wire Line 10550 875 10550 950 Connection ~ 10250 875 Connection ~ 9650 875 $Comp L GND #PWR015 U 1 1 5C1E3B47 P 6600 7500 F 0 "#PWR015" H 6600 7250 50 0001 C CNN F 1 "GND" H 6600 7350 50 0000 C CNN F 2 "" H 6600 7500 50 0001 C CNN F 3 "" H 6600 7500 50 0001 C CNN 1 6600 7500 1 0 0 -1 $EndComp Wire Wire Line 6500 7350 6500 7425 Wire Wire Line 6500 7425 6700 7425 Wire Wire Line 6700 7425 6700 7350 Wire Wire Line 6600 7500 6600 7425 Connection ~ 6600 7425 NoConn ~ 6600 6150 $Comp L C C5 U 1 1 5C1EB83C P 10850 1100 F 0 "C5" H 10875 1200 50 0000 L CNN F 1 "100nF" H 10875 1000 50 0000 L CNN F 2 "Capacitors_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 10888 950 50 0001 C CNN F 3 "" H 10850 1100 50 0001 C CNN 1 10850 1100 1 0 0 -1 $EndComp Wire Wire Line 10850 875 10850 950 Connection ~ 10550 875 Wire Wire Line 10850 1250 10850 1400 Wire Wire Line 10550 1250 10550 1325 Connection ~ 10550 1325 Connection ~ 10850 1325 $Comp L Jumper_NC_Dual JP9 U 1 1 5C1ECAEA P 3500 1325 F 0 "JP9" H 3550 1225 50 0000 L CNN F 1 "LO/HI" H 3500 1425 50 0000 C BNN F 2 "Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm" H 3500 1325 50 0001 C CNN F 3 "" H 3500 1325 50 0001 C CNN 1 3500 1325 0 1 1 0 $EndComp Wire Wire Line 3325 1325 3400 1325 Wire Wire Line 5100 1000 3500 1000 Wire Wire Line 3500 1000 3500 1075 Wire Wire Line 3500 1575 3500 1650 Wire Wire Line 3500 1650 3750 1650 Wire Wire Line 5100 1000 5100 1650 Wire Wire Line 5100 1325 5175 1325 Connection ~ 5100 1325 Text Notes 7025 6775 0 60 ~ 0 Enhanced RAM board with added support for ROM ICs of type 28C64 or 28C256, can be\naddressed high/low. Individual 4k blocks can be enabled via jumpers. $Comp L 74LS08 U3 U 1 1 5C68602F P 2125 4175 F 0 "U3" H 2125 4225 50 0000 C CNN F 1 "74LS08" H 2125 4125 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 2125 4175 50 0001 C CNN F 3 "" H 2125 4175 50 0001 C CNN 1 2125 4175 0 -1 -1 0 $EndComp $Comp L 74LS08 U3 U 2 1 5C6865C4 P 2975 4725 F 0 "U3" H 2975 4775 50 0000 C CNN F 1 "74LS08" H 2975 4675 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 2975 4725 50 0001 C CNN F 3 "" H 2975 4725 50 0001 C CNN 2 2975 4725 0 -1 -1 0 $EndComp $Comp L 74LS08 U3 U 3 1 5C686812 P 3800 5275 F 0 "U3" H 3800 5325 50 0000 C CNN F 1 "74LS08" H 3800 5225 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 3800 5275 50 0001 C CNN F 3 "" H 3800 5275 50 0001 C CNN 3 3800 5275 0 -1 -1 0 $EndComp $Comp L 74LS08 U3 U 4 1 5C68689D P 4650 5825 F 0 "U3" H 4650 5875 50 0000 C CNN F 1 "74LS08" H 4650 5775 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 4650 5825 50 0001 C CNN F 3 "" H 4650 5825 50 0001 C CNN 4 4650 5825 0 -1 -1 0 $EndComp $Comp L 74LS08 U4 U 1 1 5C687BF2 P 3650 3575 F 0 "U4" H 3650 3625 50 0000 C CNN F 1 "74LS08" H 3650 3525 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 3650 3575 50 0001 C CNN F 3 "" H 3650 3575 50 0001 C CNN 1 3650 3575 1 0 0 -1 $EndComp $Comp L 74LS08 U4 U 2 1 5C687CAF P 5325 4675 F 0 "U4" H 5325 4725 50 0000 C CNN F 1 "74LS08" H 5325 4625 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 5325 4675 50 0001 C CNN F 3 "" H 5325 4675 50 0001 C CNN 2 5325 4675 1 0 0 -1 $EndComp $Comp L 74LS08 U4 U 3 1 5C687D29 P 6675 4125 F 0 "U4" H 6675 4175 50 0000 C CNN F 1 "74LS08" H 6675 4075 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 6675 4125 50 0001 C CNN F 3 "" H 6675 4125 50 0001 C CNN 3 6675 4125 1 0 0 -1 $EndComp $Comp L 74LS08 U4 U 4 1 5C687DB2 P 6600 6750 F 0 "U4" H 6600 6800 50 0000 C CNN F 1 "74LS08" H 6600 6700 50 0000 C CNN F 2 "Housings_DIP:DIP-14_W7.62mm_Socket" H 6600 6750 50 0001 C CNN F 3 "" H 6600 6750 50 0001 C CNN 4 6600 6750 0 -1 -1 0 $EndComp $EndSCHEMATC