Re: ms pac voltage trouble

<x-flowed>If the board produces a good image when you increase the 5VDC supply
then your video RAM has at least one bad IC. RAM is usually the most
susceptible to voltage fluctuations and will show errors faster than
other parts.

Also the fact that the game runs indicates it is not on the Data bus,
rather it is the video handling circuits...

John :-#)#

At 9:53 PM -0500 3/17/05, tony wrote:
> i am working a a ms pac man with a daughter board all ac voltages
>
> > are fine sound works great its 5 volt line is at 4.95 vdc at c2 and
>
> > c3 and the game plays but the graphics are real bad and lines
>
> > through the picture, the d7 un banded to d8 ubd 13.5 vac and d3
>
> > to d4 ubd 25.5 vac i pulled it from the game and hooked it up on
>
> > the bench to a good monitor and my dc power supply though pin 18
>
> > and ground and gave it 4.95 volts same thing then i turned it up to
>
> > 5.75 vdc and bam it all came in fine looks great so how do i get
>
> > the ac in the game up or the dc on the board up checked for ac in
>
> > the dc and there is none and checked d9 for a short or leaky and it
>
> > was not any help
>
>thanks ton
>
>
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