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Old 04-26-2008, 11:56 PM
Grant Stockly Grant Stockly is offline
Join Date: Jan 2005
Posts: 447
Default Adjusting or Tuning the Altair CPU Card

Even if your CPU card works, it may not have the correct timing.

You'll want to check the two clock phases 1 and 2 on pins 22 and 15.

You'll want to make sure your card follows these standards:

Someone wanted me to adjust a vintage Altair 8800 CPU card for optimal performance.

Sorry for not getting "good" pictures of the scope.

This is where it started. Phase 2 was too long according to the spec (To2). Keep in mind this card worked perfectly, but may not be stable or respond well to temperature differences.

After replacing the 4.7k R42 with a 4.3k resistor, it looks like this:

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Old 05-01-2008, 06:07 PM
marty marty is offline
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Join Date: Jun 2007
Posts: 118
Talking adjusting

Hi Grant;
I think I have a similiar scope to your... Only your signals look a lot cleaner than mine,,, mine look like, They were in the rough Seas !!!! Yours are basically straight and mine are not... What's up ????
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