Building the TD4 4-Bit CPU
5 hours ago
- #Computer Architecture
- #DIY CPU
- #Educational Electronics
- The TD4 is a 4-bit CPU from a Japanese book, built using 74-series TTL logic ICs.
- Assembly involves soldering diodes for a Diode Matrix ROM and using DIP switches for programming.
- The CPU has a simple design with 12 instructions, 16-byte ROM, and runs on 5V via USB.
- Key components include 74HC161 registers, 74HC283 ALU, and a 74HC14 clock oscillator.
- A web-based assembler tool was created to convert code to DIP switch settings for easier programming.
- The project offers hands-on learning about computer architecture without microcode or complex layers.