Re: Joust CPU problem

Is this a screen that is supposed to have upper islands?

My guess (just a guess) would be that your vid ram address decode
(chip selects) are hosed. I'd probe around there with a scope and
see if you see multiple chip selects happening at once..

Kurt

>
> My joust is now doing this http://www.basementarcade.com/doubejoust.JPG
> The bottom half of the screen is repeated on the top!! The test screen
> passes all the rom, cmos and only gives a error on one screen prior to
> the color bar test that states something like "vertical bar error" or
> something like that. Any ideas as I have exhausted all the William's
> tech pages I could hunt down.
>
> -=Mark=-
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Received on Mon Oct 15 09:27:36 2001