On Tue, 22 Jan 2008 17:57:32 -0600, you wrote:
>Hello all,
>
>OK, after fooling around with the EPROMs and buzzing out a bunch of
>sockets, I tried replacing the game Z80 micro. Success! Omega Race is
>back to life. (Both Z80's ended up being bad.)
>
>Thanks to all the folks who suggested things to try.
>
>BTW, I read 4.75V on the +5 on the CPU board (and on the power supply
>itself), even with the adjustment pot all the way up. The game seems to
>run fine but I am somewhat concerned. Any ideas?
Technically, TTL will run at anywhere from 4.75V to 5.25V, so I don't
think there's any cause for immediate panic. :) I would check the wiring
between the PSU and the logic boards; make sure you have a good clean
ground, as Matt suggested, and also make sure that the voltage wires are in
good shape and that the connections at both ends are solid and unoxidized.
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Received on Tue Jan 22 20:17:35 2008
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