Hands-On CPU Design: Building the TD4 from Basic Logic Gates

The TD4 offers a practical, accessible path to mastering CPU architecture and hard-wired digital logic design—concepts fundamental to all computing. Building and experimenting with this 4-bit processor using basic TTL logic provides direct, hands-on insight into how instructions execute through gates and registers, transforming abstract concepts into tangible understanding. This project proves that understanding processor fundamentals is achievable for hobbyists and students, not just specialists.