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(nasm.info)Section B.4.190

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B.4.190. `NOP': No Operation
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     NOP                           ; 90                   [8086]

   `NOP' performs no operation. Its opcode is the same as that generated
by `XCHG AX,AX' or `XCHG EAX,EAX' (depending on the processor mode; see
*Note Section B.4.333::).