Re: Joust CPU problem

Yes, What you are seeing is the bottom 1/2 of the screen repeated on the top as
well as the bottom. It is the same for all the screens be it game or test. I
only get the bottom half to the screen repeated twice :-(

-=MArk=

Kurt Mahan wrote:

> 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 11:17:43 2001