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(nasm.info)Section B.4.329

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B.4.329. `WRMSR': Write Model-Specific Registers
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     WRMSR                         ; 0F 30                [PENT]

   `WRMSR' writes the value in `EDX:EAX' to the processor Model-
Specific Register (MSR) whose index is stored in `ECX'. See also
`RDMSR' (*Note Section B.4.270::).