EDN

Building a 4-Bit Computer: The Instruction Set

The registers inside the CPU, the machine code instruction set, and the ways in which the instructions interact with the registers and status flags are all intertwined. As you may recall, one of my ...
EDN

Building a 4-Bit Computer: Instruction Trade-offs

If you are limiting yourself to only 16 instructions, which ones should you chose, and how do you manage without the ones that fall by the wayside? In my previous column on our project to build a ...
Hackaday

4-bit Single Board Computer Based On The Intel 4004 Microprocessor

[Scott Baker] is at it again and this time he has built a 4-bit single board computer based on the Intel 4004 microprocessor. In the board design [Scott] covers the CPU (both the Intel 4004 and 4040 ...
Hackaday

Imagining The CPS-1: An Early 70s 4-bit Microcomputer From Canada

CPS-1: Imagining An Early 70s 4-bit Microcomputer. The CPS-1 was the first Canadian microprocessor-based computer. It was built by ...