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Thread: Gaelco World Rally repair log

  1. #1
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    Gaelco World Rally repair log

    I got a faulty World Rally board from Rugdoctor.
    The game booted but had 2 issues:
    - RAM checksum error at address XXX (changes every time you power the board)
    - Coprocessor not ready (indicates the game has committed suicide)

    For the RAM error I first thought it was bad but discovered a cut trace. I patched it and the problem was fixed.

    Then I tried to un-suicide the game. I needed a RS232 to TTL converter and as my computer doesn't have a serial port anymore (I had it through the docking station but I got rid of it...) I went the USB to TTL converter route:
    http://www.ebay.fr/itm/PL2303HX-UART...YAAOSwgQ9Vo~bT

    The pinout on the World Rally board is as follow:
    - 1 (closest to the printed 0) = VCC
    - 2 = TXD
    - 3 = RXD
    - 4 = /PROG
    - 5 = GND
    You must bridge /PROG to GND on the board and connect only 3 wires to the TTL adapter (GND/TXD/RXD). Pinout may vary according to the adapter so just check yours.
    The port settings are 2400b/s, 8 data bits, no parity, 1 stop bit and XON/XOFF flux control.
    With hyperterminal (or any other serial communication software) send a carrier return. The game should answer "DS5002 LOADER VERSION 0.1..."
    Then send U, the game should answer "UNLOCKED".
    Send L, the game waits for a file to load.
    Copy and paste the following code:

    Quote Originally Posted by Gaelco
    File too big
    [EDIT]
    Can be found here:
    http://foulweb.free.fr/divers/prog/WRDALLAS.HEX
    (Or you can do as I did: download the romset on Gaelco website and convert the wrdallas.bin file to hex).
    [/EDIT]

    Transfer is quite long (between 5 and 10mn?).
    When finished type Z to lock the DS5002.

    Unfortunately it didn't work for me on first try. The cause was another broken trace. I fixed it and started the download procedure again and it worked!
    Another game saved.

    DSCN4513.JPG

    DSCN4515.JPG

    [EDIT2]
    I forgot to mention I obviously replaced the battery.
    [/EDIT2]

    [EDIT3]
    Added pics
    [/EDIT3]
    Last edited by Apocalypse; 05-18-2016 at 05:32 PM.
    Current SNK projects:
    - Samurai Spirits (Shodown) RPG English version for the NGCD:
    http://www.neo-geo.com/forums/showth...nch-to-English)
    - AES to MVS converter (plays AES games on MVS):
    http://www.neo-geo.com/forums/showth...-games-on-MVS)


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