This is my attempt of building a complete computer using only discrete parts like transistors, diodes, capactitors and resistors.

Just to get warmed up a bit I've started designing an UART capable of transmiting and receiving serial data in 300 bps.

I plan to make proper PCBs for the boards that I require a lot of, like memory, registers and ALU-slices, but many of the more or less one-off boards will be made on standard donut-perfboard with thru-hole parts.

I've used, collected, gleaned, stolen, borrowed and been inspired by the information on the following web sites:

Donut pcb layout creator - code.google.com/p/diy-layout-creator/
Ring counter - vk2zay.net/article/201
Asymetric multivibrator - 4qdtec.com/mvibs.html
Single cycle CPU - eecg.toronto.edu/~moshovos/ECE243-07/...
Binary incrementer - letslearncomputing.blogspot.com/2013/....
12/8bit cpu - usti8bit.blogspot.com
8bit ttl cpu - digitarworld.uw.hu/ttlcpu.html
ASAP3 Computer - pong74ls.blogspot.com/...
Tiny Tim - northdownfarm.co.uk/rory/tim/tinytim.htm

Link to Google Sheets for a TX faker generator.