Re: Needed: Help disassembling Williams Test ROM

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Yup, that is not the problem, the board runs from 0 - 9 and then goes to 0
but without a double blink...

John :-#)#

At 05:31 PM 06/06/2003 -0400, Kev wrote:

>Are you sure that you are running the correct portion of the ROM?
>
>Kev
>
>
>
> > OK, I know Williams doesn't like this, however Ted Estes hasn't got the
> > info I need so here is my problem:
> >
> > Williams produced a Test ROM (2532) that covered system 3 - through 7 and
> > the image is split in two.
> > 0000 - 07FF is for the earlier games (two LED indicators)
> > 0800 - 0FFF is for System 7 (seven segment display)
> >
> > Using this in a game like Black Night (second image used) shows a count
> > from 0 - 9, and then the display blinks twice and shows a steady 0. All
>the
> > tests from 0 - 9 seem to emulate the same tests that BK shows in the
>little
> > book, however what is NOT documented is the double blink! I thought it
> > might be an interrupt test, but the IRQ timing is correct...
> >
> > What I have is two seemingly identical boards - one that boots fine and
>the
> > test shows the correct sequence, and a second that counts correctly but
> > won't do the double blink nor does it boot.
> >
> > Fluke 9010A claims RAM ROM and I/O are fine. (in case you were curious)
> >
> > So what I am left with it trying to figure out what the double blink
> > portion of the test was. Ted Estes thought it had no meaning - but he had
> > never been able to find the docs on this test Eprom when he worked at
> > Williams (seems to have done a thorough search!) - but now he is not so
> > sure. So I am trying to disassemble the Eprom image (800 - FFF) in an
> > effort to find what that test might be. Unfortunately I am NOT any good at
> > this and was hoping that someone with experience in this would be
> > interested in helping document this Test Eprom.
> >
> > Sections of it make sense to me, like RESET clears all the PIAs, but then
> > it wanders off to check the contents of assigned RAM locations and I don't
> > know how to track this efficiently...but am happy to provide a table of
> > ROM/RAM and I/O ports.
> >
> > This is a 6800 based system (6808) with five 6821's, one IRQ generator
> > (1k077hz) running at 1Mhz.
> >
> > I have the Test ROM from Two Bit, it is the same Williams program for the
> > 1st half (0-7FF), the second (800-FFF) is different though, and not very
> > well documented...
> >
> > Thanks if anyone can help...
> >
> > John :-#)#
> > Thanks!
> >

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Received on Fri Jun 06 16:25:11 2003