Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Showing posts with label microcode. Show all posts

Showing posts with label microcode. Show all posts

Silicon reverse-engineering: the Intel 8086 processor's flag circuitry

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...

Understanding the x86's Decimal Adjust after Addition (DAA) instruction

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

Reverse-engineering the Intel 8086 processor's HALT circuits

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

The 8086 processor's microcode pipeline from die analysis

Intel introduced the 8086 microprocessor in 1978, and its influence still remains through the popular x86 architecture. The 8086 was a fai...

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