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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄Key to Encodings►  ◄Reg►  ◄Mod►  ◄R/m►  ◄Back►
──────────────────────────────────────────────────────────────────────────────
 
  This 2-bit field indicates addressing mode, in conjunction with r/m.
 
  00   If r/m is 110, a direct memory operand is used; otherwise, an
       indirect memory operand is used with no displacement.
 
  01   An indirect memory operand is used with an 8-bit displacement.
 
  10   An indirect memory operand is used with a 16-bit displacement.
 
  11   Instruction is register-to-register. The reg field specifies
       the destination, and the r/m field specifies the source.
                                    -♦-