Re: More Omega Race notes

Mike, you said you had a bad output in one area..
I have a boardset that works fine, but has random vectors when I shoot, or run the ship into 'only' the right vertical wall barrier. If I hold down the thrust and bounce against the right wall.. the ship sorta breaks up and a line of vectors goes horizontal across the screen. It 'only' happens on this rightmost wall. Do you know (I am hoping from you fixing one particular area on the gamescreen) which part of the circuit may be responsible for this are? Or is this not how it works?
Looking for any help on finally solving it...
Thanks

--- On Fri, 11/14/08, mike.ranger@arcelormittal.com <mike.ranger@arcelormittal.com> wrote:

> From: mike.ranger@arcelormittal.com <mike.ranger@arcelormittal.com>
> Subject: VECTOR: More Omega Race notes
> To: vectorlist@vectorlist.org
> Date: Friday, November 14, 2008, 9:50 AM
> Working on my second boardset now. Started by fixing acid
> damaged
> areas, then plugged in the fluke 9010a.
>
> I worked a fair bit to finally get it to read the ROMS, and
> then the RAM
> SHORT on the 2 sets of ram (4000-4BFF and 8000 to 8FFF).
>
> Once I got those to work ( and ram short did find a problem
> with the
> third test, an address line was not working).
>
> I then figured I was on to the vector generator. I had a
> bad looking
> output from x and y, top left only, small trapaziod.
>
> Spent a fair amount of time tracing back to bad opcodes,
> and eventually
> I figured the vector RAM was not getting the proper
> information. Looked
> all over the place, then noticed I was resetting every 2
> seconds. D'oh.
>
> I went back to the 9010a and ram short was still working
> fine, so I
> tried RAM long on the cpu mem (4000-4BFF), all is well.
>
> Tried RAM LONG on 8000 to 8FFF, and the fourth algorithm
> failed. Some
> pattern thing.
> To isolate it as a RAM chip, or an addressing issue, I
> tried RAM LONG on
>
> 8000-83FF - Fail Wrote FF read FE
> 8400-87FF - PASS
> 8800-8BFF - PASS
> 8C00-8FFF - PASS
>
> Looks Like I have a problem with one chip. Used the
> manual's self test
> screen capture to figure where the chip was, swapped it.
>
> So I think I am now on to problems in the vector generator.
>
> One neat thing, for looking at the self test results on the
> bench, I too
> an old connector from a williams machnine, which has the
> punch down wire
> conections, and punched down an LED and put it on the
> header for the
> sound board, now I can see the self test flashing the start
> LED's for
> diagnostics.
>
> Mike

      
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Received on Fri Nov 14 15:12:48 2008