First run

A project log for DIP-8 TTL Computer

Digital Information Processor - an 8-bit computer made out of 7400 series logic and some EEPROMs.

kaimackaimac 09/04/2022 at 20:370 Comments


The boards are not fully populated yet, and I have no memory or I/O - just an AVR microcontroller emulating a ROM. The three LEDs are the carry, zero and negative flags, and the tiny program in the ROM is just doing a chaser pattern on these.

Projects like this require that you give things fancy names. So here's the "fetch/decode" unit - instruction register, control ROMs, program counter and address register:

And here's the "execute" unit - register file and ALU.