Programming the Gigatron: A Deep Dive into a TTL Microcomputer
This page documents the author's journey to understand and program the Gigatron TTL Color Micro-computer, a retro machine built from TTL logic chips. It details the CPU's Harvard architecture, its 8-bit registers, and a comprehensive instruction set table derived from the emulator. The author also analyzes the ROM's assembly code to identify the most frequently used instructions, providing a unique insight into how the Gigatron's software is structured.
The CPU implemented by the TTL IC's of the Gigatron has a Harvard architecture, which means that it does not have a shared bus for the ROM and the RAM.