RE: Sega G80 error codes?

>
> Hi all,
> I'm working on Tac/Scan and am having trouble with a CPU
> board. When I start
> it up, the red LED on the CPU board flashes once, but the
> game does not come
> up. When I press the self-test switch, the LED continuously
> repeats the
> following series of flashes: two short, pause, seven short,
> pause, one long.

This indicates a bad RAM on the XY control board. RAM position U27.

> I can't find any mention of the flashes meaning anything in
> the manual.

I don't have the manual in front of me, but I believe it is described in the
test procedure.

> Is
> the pattern meaningful? If so, can somebody decode it? (The
> game works fine
> with another CPU board.)

Since you say that the game works fine with another CPU board, my guess is
that the RAM in fine, but your CPU board is somehow corrupting the data,
making it believe it's the XY controller's fault.

-- 
Mark Jenison
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