Guide to the TD4 4-bit DIY CPU

One day i hope to build something like this.

I am not a hardware guy but very intrigued by the basics of computing and interested enough to throw some, but not a lot, of hours at building something like this from a kit I can order in one part.

So far though, all projects I have seen are fairly expensive (Ben Eater’s excellent kits) or unobtainable as they were one-off projects by someone four years ago or (again in this case) using components from suppliers that.. stopped supplying.

Awesome! I wonder if it would be possible to extend it to get 4bit games running https://youtu.be/eKpjXh-vH8I?si=rNMJpJIu1Hk0X9vQ

similar https://github.com/c0rRupT9/STEPLA-1

Question is how add input , output data, screen, keyboard similar DPD-11 or ODRA1305 how add more element or... meybe add a 10 BITS

So you program it with dip switches is that right?

Truly old school.

This articale made me have recoolection of the EDUC 8 from about 1974 built with just TTL chips

https://en.wikipedia.org/wiki/EDUC-8

The EDUC-8 is an 8-bit bit-serial design with 32 to 256 bytes of RAM. The internal clock speed is 500 kHz, with an instruction speed of approximately 10 kHz,

First published in Electronics Australia in August 1974, the EDUC-8 was designed specifically for home construction by electronics hobbyists.