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(nasm.info)Section B.4.139

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B.4.139. `LMSW': Load/Store Machine Status Word
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     LMSW r/m16                    ; 0F 01 /6             [286,PRIV]

   `LMSW' loads the bottom four bits of the source operand into the
bottom four bits of the `CR0' control register (or the Machine Status
Word, on 286 processors). See also `SMSW' (*Note Section B.4.296::).