CS/A gecko parts list V1.0
These are the parts needed for the gecko system.
IC1 6502 CPU
IC2,8 74LS139 dual 2-to-4 decoder
IC3 74LS00 4x NAND
IC4 74LS06 6x Inverter, Open Collector
IC5 6264/62256 8k or 32k static RAM
IC6 2764/27128/27256 8k, 16k or 32k EPROM
IC7 2 MHz Oscillator
IC9 74LS688 8 bit compare
IC10 16550A UART (with FIFO)
IC11 6522 VIA Versatile Interface Adapter
IC12,13 MAX232 RS232 level converter
IC14 74LS14 6x Inverter with Schmitt-Trigger
IC15 74LS86 4x XOR
IC16 74LS245 8 bit bidirectional bus driver
IC17 74LS13 2x NAND with Schmitt-Trigger
IC18 74LS07 6x Driver, Open Collector
IC19 74LS145 BCD to decimal decoder, O.C.
R1 100k Ohm
R2-5,7,9-13 4k7 Ohm
R6 180 Ohm
R8 33 Ohm
R14 1k5 Ohm
R15 1M Ohm
R16 470 Ohm
C1 100uF
C2-7 47uF
C8 100nF
C9,10 10pF
D1 1N4148
D2,3 LD271 or LD274
D4 LED, yellow
Q1 Crystal 1.8432 MHz
J1 3 pin RAM size 8/32 kByte
J2 3 pin ROM size 8-16/32 kByte
J3 3 pin I/O size 2/4 kByte
J4 2 pin IEC ATNA enable
P1 64 pin male DIN 41612 type C
P2 9 pin D-Sub male (RS232)
P3 CBM serial IEC female DIN 6 pin
P4 2x5 pin
P5 4 pin
PB1 Reset pushbutton
PB2-x Keyboard buttons