Re: Needed: Help disassembling Williams Test ROM

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!
>
Received on Fri Jun 06 15:08:44 2003