Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Select an instruction for more information.
 
     Instruction     Description
 
     NOP             No Operation
     WAIT            Wait (stop and wait for coprocessor signal)
     HLT             Halt (stop execution until interrupt received)
     LOCK            Lock the bus (lock out other processors)
 
     ARPL            Adjust requested privilege level (286+)
     LAR             Load access rights (286+)
     LSL             Load segment limit (286+)
     LGDT            Load global descriptor table (286+)
     SGDT            Save global descriptor table (286+)
     LIDT            Load interrupt descriptor table (286+)
     SIDT            Save interrupt descriptor table (286+)
     LLDT            Load local descriptor table (286+)
     SLDT            Save local descriptor table (286+)
     LMSW            Load machine status word (286+)
     SMSW            Save machine status word (286+)
     LTR             Load task register (286+)
     STR             Store task register (286+)
 
     VERR            Verify read (286+)
     VERW            Verify write (286+)
     CLTS            Clear task switch flag (286+)
     MOV special     Move special CPU register (386+)
 
     INVD            Invalidate data cache (486+)
     INVLPG          Invalidate translation lookaside buffer (486+)
     WBINVD          Invalidate data cache with write-back (486+)
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