
                         CS/A gecko parts list V1.0
                                      
                  (c) 1997 Andr Fachat [Mail] [Homepage]
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   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
