Microcode ROM module (almost) implemented

A project log for JACA 1 & 2 Homebrew Computer

JACA - Just Another CPU Again Homebrew CPU, starting by a simple POC 4-bit CPU on circuit simulator soft. (done), then 8-bit (in progress)

Andre BaptistaAndre Baptista 02/17/2018 at 23:350 Comments

Last weeks I implemented the microcode ROM in two breadboards:

It's not very beautiful, as lacks me patience to cut wires the exact length and right colors...

Besides that I started to document the circuit in an online tool called EasyEDA. This will be important in two ways:

- Allow to understand the circuit on breadboards (it's a bit different of the Logisim circuit);

- Make it possible to order the PCBs in the future, for a most professional version of the computer.

Links for the Easy EDA schematics (I made them public, but not tested yet):

PC and Memory 

Instruction Register

Another improvement: finally connected the PC, memory (very crude version) and IR together. I'm very anxious to see the computer working after almost one year, even a very basic version, so I made some things simpler, and after I will improve.

Thanks for reading.