Re: Still Looking for Gravitar Help

I'm going to be working on a Gravitar and Black Widow board this week. I'll
document some of the procedures and signatures as I go through them. If you
go on to KLOV you can get the manual for both. The Gravitar manual has some
CAT box procedures with signatures, but I'm not sure how much it'll help in
your case because it doesn't cover much ground.

Matt

----- Original Message -----
From: "Jon Raiford" <raiford@mindspring.com>
To: <vectorlist@vectorlist.org>
Sent: Wednesday, October 08, 2003 8:25 AM
Subject: Re: VECTOR: Still Looking for Gravitar Help

> Isn't there a tempest repair guide on the net? Someone can probably give
you the URL.. I would suggest following it for the most part. General
ideas like separating the game logic from the vector generator need to be
followed. I think there are also sigs around for Gravitar (in the schems
for Gravitar or Black Widow?) to help you point to a specific section to
look at.
>
> Jon
>
> At 02:26 PM 10/1/2003 -0600, you wrote:
> >Sorry for the repeat request, but I could really use some tips on
troubleshooting this Gravitar board. I actually dreamed I fixed it last
night... guess I've been really obsessed with repairing it.
> >
> >Just to refresh, the #WDCLR timer pulses four times in rapid succession,
then stays high which causes a reset. Pulling #WDDIS low doesn't help in
troubleshooting, the address lines and data bus continue to run in what I'd
consider a "confused" state... there appears to be skinny pulses on the
address lines and major bus contention on the data bus. I swapped all the
socketed parts into a BW board and it comes up fine. All the clocks look
good.
> >
> >I thought I found an issue with the #IRQ line last night. It is low and
the LS161 counter isn't counting even though #INTACK is high. Forcing the
ENT (pin 10, also the #IRQ line) line high causes the LS161 to begin
counting.
> >At any rate, I concluded this anomaly is due to a startup issue (#INTACK)
since the #IRQ line loops back to ENT on the LS161.
> >
> >When you guys end up going in loops on these things, do you just start
shotgunning? I think I'm at that point and was going to start with the
address decoders at R2, P3 and R1. The LS138 shouldn't be an issue, but
what should I do about the 136010-x11,x12? What exactly are they and are
they available somewhere?
> >
> >Thanks,
> >
> >Tim Tewalt
> >
> >_________________________________________________________________
> >Instant message during games with MSN Messenger 6.0. Download it now
FREE!
> >http://msnmessenger-download.com
> >
>
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Received on Wed Oct 8 13:13:01 2003