This CPU is a microprogrammed, discrete-component design. In contrast to modern single-chip microprocessors, discrete-component CPUs consist of hundreds of relatively simple individual building-block Integrated Circuits (ICs), laid out on large Printed Circuit Boards (PCBs) and connected together by thousands of individual connections (traces).
The C74-6502 was designed by hobbyists working at home, soldered by hand and built using simple tools and techniques. It consists of some 200 ICs and 4,000 individual solder points laid out on two sister PCBs.
It took two years to complete the design and build the first prototype. See the original build forum thread.
Images From The Build-Process
A big day in the lab — First Life!