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Double Dragon Error - NO 63701 msg at all

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Anything to do with repairs.

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  • Double Dragon Error - NO 63701 msg at all

    Hi,
    Understand there are many instances of this throwing an error on bootup, however with my pcb all of the other rom/ram checks are ok, but does not display the 63710 check at all and the game does not progress from there.

    Any ideas? Is the processor stuffed? Board appears in pretty good nic, with the exception of a work around for the amp which I'm told is OK.

  • #2
    The 63710 has its own ram, thats what I would check first
    Always interested in Retro and Current gaming

    https://www.gamedude.com.au

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    • #3
      thanks for that I'll check it out

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      • #4
        this is an old post but i my self have got my self a double dragon board. but is missing 63710 64 pin chip!. my understanding is to make an adapter to suit 27256
        eprom wire certain connection to match and flash 21jm-0 to 63710

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        • #5
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          • #6
            Click image for larger version

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            • #7
              Can't make out all the connections. Looks like A11 isn't connected to anything.

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              • #8
                It looks to me like you just connect all the pins to their respective twin on the 63710.
                So D1 on the 27256 goes to D1 on the 63710.
                It also looks like A10 in the 27256 isn't connected and A11 of the 27256 is connected to A10 of the 63710 so unless someone knows different this could be a mistake in the diagram.
                /OE on the 27256 looks to be connected to pin 40 of the 63710 as is A9 of the 27256.
                Can't see anything connected to /CE on the 27256 so I assume they would need to be connected to GND.

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                • #9
                  the pitch are different so it's going to be a fun program using wires

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                  • #10
                    Click image for larger version

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                    • #11
                      looks like wires are too long for data to flow

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                      • #12
                        ill have to make adapter

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                        • #13
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                          • #14
                            Originally posted by Lurch666 View Post
                            It looks to me like you just connect all the pins to their respective twin on the 63710.
                            So D1 on the 27256 goes to D1 on the 63710.
                            It also looks like A10 in the 27256 isn't connected and A11 of the 27256 is connected to A10 of the 63710 so unless someone knows different this could be a mistake in the diagram.
                            /OE on the 27256 looks to be connected to pin 40 of the 63710 as is A9 of the 27256.
                            Can't see anything connected to /CE on the 27256 so I assume they would need to be connected to GND.
                            yeah i did miss a few pins on that diagram lol😄

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