Re: Tempest resetting problem

Matt,

When I first brought my Tempest home it would perform the same actions - I'd
reseat the ROMS and it would work fine. Few weeks later - same thing. Reseat
and OK. After the third time, I resoldered the sockets and it hasn't done that
since. There were quite a few solder joints made after manufacture, many of
them looked pretty ugly.

    - Matt

Matt Rossiter - Verio Southern California wrote:

> I've been trying to fix a tempest board, but I can't seem to figure out
> what the problem is. When I power the game up is just keeps beeping and
> the 1&2 player lights just blink. When I put the game in test mode it
> does the same and then when I ground the WDDIS is doesn't beep is just
> sustains a long tone. Obviously a restting problem.
>
> The roms are good and the Mathbox board is good. The clock is ciruitry is
> good (Feedback loops seem to look good on the scope). All the voltages
> check out fine.
>
> The two things I'm suspect of are 1) The watchdog circuit: even though the
> circuit looks fine on the scope, I can't help but think the problem lies
> in this circuit
>
> 2) I'm not so sure of the ram. My fluke 9010a can't do a read/Write to
> anything in the ram address space (both program ram and color vector ram)
> - so either one of the buffers is bad or a ram chip is bad.
>
> Perhaps someone could give me ideas? Sometimes I have a tendancy to
> overlook obvious things.
>
> Thanks...
>
> Matt
>

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