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Ground control

A project log for Gigatron TTL microcomputer

Just because! A home computer without microprocessor

Marcel van KervinckMarcel van Kervinck 05/02/2017 at 11:152 Comments

This is the glitch I was still contemplating yesterday:

It isn't a EEPROM timing issue after all. Low signals into the instruction decoder just weren't always low enough. The culprit turned out to be the IR register's ground pin:

Signals look much better with that sorted out:

Next is the verification of the ALU.

Discussions

Yann Guidon / YGDES wrote 05/02/2017 at 13:36 point

solderless breadboards are lousy :-(

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Marcel van Kervinck wrote 05/02/2017 at 13:49 point

They are good for prototyping. I doubt I can get it working by soldering everything from the start. I make many mistakes.

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