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TECH: 1702a Eprom Voltages

Discussion in 'Beginner Electronics' started by [email protected], Sep 17, 2006.

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  1. Guest

    Hi All,

    I have in a 1978 model pinball machine, one 1702a.

    I would like to backup it contents, but my eprom programmer works with
    2716 and later.

    My question is -

    When I probe the cpu board with a scope, around the eprom, I was
    expecting to find 5, -5 and -12.

    I only find +5 and -12.

    Can I power this device from an external -12 and make a adapter to then
    read its contents like a 2716.

    I can then program a 2716 and using a couple of sockets, rewire for the
    2716 in place of the 1702a.

    Any help appreciated.

    Kind Regards, Garry
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