Thread: Pinouts
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Old 28 December 2005, 06:57   #7
adolescent
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Join Date: Feb 2002
Location: Redondo Beach, CA
Age: 48
Posts: 1,064
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Code:
           ================================================
                 A600 Trapdoor Expansion Connector Pinouts
           ================================================

                mapped by Bruce Abbott (bhabb...@inhb.co.nz)

    ExRAM pin      designation        Description
    ---------      -----------        -----------

    1-2            +5V                +5 volt power supply
    3-4            GND                ground
    5-20           DRD0-15            DRAM data bus
    21-22          GND                ground
    23-31          DRA0-8             DRAM address bus
    32             nc
    33-34          ???                internal chipram strobes?
    35             CASL               DRAM Column Address Strobe, lower
    36             CASU               DRAM Column Address Strobe, upper
    37             RAS0               DRAM Row Address Strobe 0
    38             RAS1               DRAM Row Address Strobe 1
    39             /WE                DRAM Write Enable
    40             /ROE               DRAM Output Enable
    41-48          RGA8-1             Custom Chip Register Address bus
    49-56          D0-D7              CPU data bus
    57-60          A1-A4              CPU address bus
    61             /NETCS ???         spare I/O select ?  (Gayle pin 14)
    62             /SPARECS ???       spare I/O select ?  (Gayle pin 15)
    63             /INT2              level 2 Interrupt Request
    64             /INT6              level 6 Interrupt Request
    65             LAUD               left audio output from Paula
    66             RAUD               right audio output from Paula
    67             14M                14.3 Mhz system clock
    68             nc
    69             CCK                color clock (3.58Mhz)
    70             /BRESET            buffered reset
    71             /IOR               I/O read for Real Time Clock
    72             /IOW               I/O write for Real Time Clock
    73             /RTC_CS            Real Time Clock Chip Select
    74             nc
    75             ???                grounded via a 470 Ohm resistor
    76             +5V                +5 volt power supply
    77-78          GND                ground
    79             +12V               +12 volt power supply
    80             -12V               -12 volt power supply

 note: nc = no connection
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