[chbot] Gigatron a 7400-series TTL microcomputer

[Charles Manning]

Hi All

All this talk today of smaller computers led me to have a bit of a nosey
into what's happening in the "crazy CPU world".

Have any of you looked at this wee CPU?

https://gigatron.io

Apart from the ROM and RAM the whole thing is just 74xx logic - 36 74xxs in
all (including the oscillator)..

It is a very barebones - 8 bit CPU but with some interesting twists.
* Each instruction is 16 bits - 8 bit instruction coding and 8 bits
immediate.
* 16-bit Harvard address space: 32kx16 ROM, 32k RAM.
* 8 bit accumulator, X and Y registers.

They have a software simulator for it that is less than 130 lines long.

Let the small times roll!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ourshack.com/pipermail/chchrobotics/attachments/20210624/afbc4f74/attachment-0001.html>