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8086 Microcode Explorer

6 days ago
https://nand2mario.github.io/8086_microcode.html
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  • #assembly
  • #microcode
  • #8086
  • The Intel 8086 uses microcode to execute machine instructions.
  • Interactive viewer lists all 512 micro-instructions in the control ROM.
  • Each micro-instruction is 21 bits wide, split into Move and Action fields.
  • Microcode address is composed of AR (upper 9 bits) and CR (lower 4 bits).
  • Short jumps update CR with a 4-bit target; long jumps replace AR and CR via Translation ROM.
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