Ken Shirriff's blog

This article looks at how the ARM1 processor executes instructions. Unexpectedly, the ARM1 uses microcode, executing multiple microinstruct...

When a computer executes a machine language instruction, it breaks down the instruction into smaller steps that are performed in sequence....

This article reverse-engineers the flag circuits in the ARM1 processor, explaining in detail how the flags are generate, controlled, and ...

By carefully examining the layout of the ARM1 processor, it can be reverse engineered. This article describes the interesting circuit used ...