RE: More Omega Race notes

Glad to hear it. I'm struggling with a problem somewhere in the '193 counters which is causing a scrolling screen. Looks like one counter is not carrying to the next, but the counters are good. Still diggin....
 
Mike

________________________________

From: owner-vectorlist@vectorlist.org on behalf of andre
Sent: Mon 11/24/2008 7:29 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: More Omega Race notes

Just to close off my problem, would like to thank Mike for the help! Of course it had to be the last chip I replaced that you pointed out that was the one failing, C3.

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

> From: mike.ranger@arcelormittal.com <mike.ranger@arcelormittal.com>
> Subject: RE: VECTOR: More Omega Race notes
> To: vectorlist@vectorlist.org
> Date: Friday, November 14, 2008, 3:57 PM
> Hey, Andre
> I'm no expert on these boards yet, but given what you
> just told
> me, It does sound vector generator realatd. If the CPU was
> putting bad
> data into the vector ram, the generator would complain, and
> you would
> reset.
>
>
> if the sign bit goes flakey, X will try to draw all over
> the
> place, on that y axis, but I think the vectors would more
> likely only
> flake out on to just the other side of centre. If they are
> going way
> back, to the left, this may not be the problem. I would
> scope out, or
> put a logic comparitor on the 174 at D6. Then look at C4
> or C3, as they
> also affect the Most significant bits going to the ad851j.
>
> Problems with the MSB's will give the most significant
> change in
> the vector locations. Since this appears only when you are
> at the
> farmost right, all, or most of the X bits will be high.
>
> Another, but unlikey, possibility is that the TL082 at 8C8
> is
> misbehaving.
>
> The fact that it is only happening to the ship puzzles me.
> I
> have to assume the ship comes from a ROM somewhere, and
> it's orientaion
> and position some how makes it into the vecor ram, and is
> drawn. Then
> getting corrupt coming out of RAM????
>
> Finaly, look at the Power supply. I seam to recall
> reading a
> note somewhere, that a marginal power supply was causing
> oddities on the
> screen. Perhaps too many vectors being drawn too far right
> is messing
> with tl082?
>
> All rambling at this point of course, but as I said on CGCC
> I will keep
> my eyes open.
>
> Mike
>
>
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of andre
> Sent: Friday, November 14, 2008 3:13 PM
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: 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 Thu Nov 27 08:45:59 2008