Re: 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
>
>---------------------------------------------------------------------------
>** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
>** message body to vectorlist-request@vectorlist.org. Please direct other
>** questions, comments, or problems to chris@westnet.com .

---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@vectorlist.org. Please direct other
** questions, comments, or problems to chris@westnet.com .
Received on Wed Oct 8 11:25:58 2003