Troubleshooting a 5V Apple III

Richard legalize at
Sun Aug 22 13:19:41 CDT 2010

In article <4C7160FF.4060009 at>,
    Mike Maginnis <mmaginnis at>  writes:

> Can anyone suggest a starting point for tracking this down?

I'm not familiar with the Apple III schematics.  Does the motherboard
include video?

If so, then it sounds like everything's good but you have a bad video
section.  I'd start looking at capacitors and if you have a high
bandwidth scope it might be instructive to look at the video out to
see if you're getting any sort of video timing at all (sync signals,
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download

      Legalize Adulthood! <>

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