Using the wrong clock edge for triggering can cause what you are describing.
If your (in your case, the Bugtrap) signature analyzer has a clock edge switch,
try the other position.
Kev wrote:
> > Are you sure you're using the correct clock edge on the analyzer?
> >
>
> I think so?
>
> Many of my other signatures were correct so I assumed my SA harness was
> right.
>
> I am using a Bugtrap SA device rather than the Cat Box.
>
> I've tried atleast 3 different PROMs, all original Atari chips. It must be
> an input problem but again all of those checksums appear correct.
>
> It may be a timing issue with the PROMs, but they are all identically
> wrong....
>
> Thanks,
> Kev
>
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-- Windows:32 bit graphical interface for a 16 bit patch for an 8 bit operating system written for a 4 bit processor by a 2 bit company that can't stand 1 bit of competition.
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