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A project log for Gigatron TTL microcomputer

Just because! A home computer without microprocessor

Marcel van KervinckMarcel van Kervinck 10/04/2017 at 16:332 Comments

The breadboard TTL color computer has a PCB baby now. Her heart beats at 6.25 MHz. Here you see the little one sleeping and dreaming of her mom. Mother and baby are doing well. Father will be fine soon also.

Discussions

Marcel van Kervinck wrote 10/04/2017 at 20:52 point

Thanks! Honestly I didn't expect it to work at all. There are some issues with the hardware but they are easy to address. My focus will indeed be on software now. Four-channel sw-defined audio is almost working. Joystick input needs to be tested. And after those the big step will be the application interpreter, because counting cycles is a nuisance. In essence it will have a sw-CPU that is suitable for simple applications/games. I have some unfinished draft code on paper for that, a bit like Wozniak's SWEET16.

With these, the whole thing will have become a contradiction of itself: every hardware function will be software-defined (video, audio, input and even the application processor), but there is no microprocessor for that software to run on...

Looking back I should have put a large 40-pin empty slot right in the middle labeled "CPU"

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f4hdk wrote 10/04/2017 at 20:11 point

The computer is now small and clean. That's much better than with breadboards.

I really like the very low component count of your design.

Do you plan to work on software now that the hardware part is finished?

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