Ken Shirriff's blog

Determining the airspeed and altitude of a fighter plane is harder than you'd expect. At slower speeds, pressure measurements can...

Status flags are a key part of most processors, indicating if an arithmetic result is negative, zero, or has a carry, for instance. In thi...

I've been looking at the DAA machine instruction on x86 processors, a special instruction for binary-coded decimal arithmetic. Intel...

The 8086 processor was introduced in 1978 and has greatly influenced modern computing through the x86 architecture. One unusual instructio...