Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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NOP Instruction
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 10010000*
──────────────────┬─────────────────────────┬───────────────────────────────
 NOP              │ nop                     │ 88/86 3
                  │                         │   286 3
                  │                         │   386 3
                  │                         │   486 3
──────────────────┴─────────────────────────┴───────────────────────────────
  * The encoding is the same for XCHG AX,AX.
                                    -♦-