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Old 06-07-2007, 01:53 AM
Grant Stockly Grant Stockly is offline
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Join Date: Jan 2005
Posts: 447
Default Fixing an 88-PPG 1702A Programmer

I borrowed a MITS 88-PPG 1702A programmer from H. E. Robert in December. I did not get around to trying the programmer for some time and when I did it did not work.

Not only did I have a need to program/copy 1702A EPROMs, but I can't return a borrowed item broken! At the time I was not sure if it had arrived to me broken, or if I did something to it! I later found the issue, a solder joint, and there is no way *I* did it.

I detailed the problem and process that I went through to fix it on the "Altair Computer Club" yahoo mailing list run by Steve Sheppard, a former MITS employee.

I talk about files during the process. All those files are available here:
http://www.stockly.com/images3/MITS_88-PPG_Debug/

Data sheets, logic analyzer captures, pictures, etc...
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