Re: Asteroids - VSM woes

This subject has been kicked around for awhile but nothing has really
developed from this.

An EPROM/Test program probably isn't the solution.

I belive John Robertson had a method of Signature Analysis for this but I
couldn't duplicate it reliably.

Another approach would be to control the PROM and some how single step the
VSM but this would require a logic analyzer to actually see what is going
on.

Kev

>
> > These were all due to bad RAMs that had all passed the RAM test.
>
> Well, I've now tried replacing all the RAM chips with tested good ones
> (both program and vector RAM) but it made no difference. Still, I at least
> know the RAM is fine now. :-)
>
> Given the relevant programming skills and Asteroids hardware knowledge,
> would it be possible to knock up a special test EPROM for, say, Asteroids
> that not only thoroughly tests the RAM and ROM, but maybe also other
> components on the board?
>
> I should have also said that I know the VSM is causing the constant resets
> as I clipped pin 1 of the LS42 at L6 (so isolating the VSM) and the game
> then plays fine (but obviously blind!).
>
>
>
> Phil
>
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Received on Wed May 1 11:42:20 2002