Sinclair ZX80 / ZX81 / Z88 Forums

Hi, anyone stumble across this already?

A simple 8 bit micro, with an EPROM and SRAM chip as main memory, but using only TTL chips for the CPU.
(74HCT actually, for those of you playing along at home ).

Homepage: https://gigatron.io/
Aussie electronics boffin Dave Jones just did a review on it: EEVblog #1080 – Gigatron TTL RISC Kit Computer Review (direct YouTube link). Also interesting (and funny) is his next video where he cuts out bypass capacitors one by one, and -unsurprisingly- the thing keeps working.

Generates VGA color video in a similar fashion as a ZX81 generates composite. And comes in a very nice housing to boot. Designers from the NL.
Quite the bobby dazzler!

ah i watched the Dave Jones video, he makes me laugh. very interesting little project, i doubt very much i would buy one, i was thinking that it must be a eprom based state machine of sorts. i can see how with so few other ttl chips it would be posiible otherwise.

regards andy

Today I received...

Mark

you gonna do a "Dave Jones" watch me build it while i prattle on about nonsense

Regards Andy

Err, no. Currently my work bench only has a ZX81 sized area that is free
Really need to tidy it up, but have various jobs in the garden that need doing...

When I do build it, I will take a series of photos though.

Mark