Ken Shirriff's blog

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

How the 8086 processor determines the length of an instruction

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The Intel 8086 processor (1978) has a complicated instruction set with instructions ranging from one to six bytes long. This raises the q...
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Reverse-engineering the ModR/M addressing microcode in the Intel 8086 processor

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One interesting aspect of a computer's instruction set is its addressing modes, how the computer determines the address for a memory ...
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Reverse-engineering the interrupt circuitry in the Intel 8086 processor

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Interrupts have been an important part of computers since the mid-1950s, 1 providing a mechanism to interrupt a program's execution. ...
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