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PJ5 TTL CPU
Blog about the TTL based CPU design we're making
We do have a problem with the display, currently sending data faster than 500KHz causes random junk to appear, we also get corrupt memory, we think some of this is due to the long ribbon cable (~500mm in length) so we need to do more investigation on this. 28th Jan 2023techpaula The display board arrived and I built it up, and I’m really happy to say that the picture is now rock solid and stable, no ghosting or jittering, I knew that breadboard was the cause 🙂 New improved clock boardNow we’ve hit a supply problem, I’m struggling to find some of the gates we use (1G57, 1G58 and 1G74), all of which seem to be out of stock and on lead times that reach to November, so at this stage I’m unsure what to do next.
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