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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 three-bit field specifies one of the general-purpose registers:
 
          If w=1     If w=0
  000     AX         AL
  001     CX         CL
  010     DX         DL
  011     BX         BL
  100     SP         AH
  101     BP         CH
  110     SI         DH
  111     DI         BH
                                    -♦-