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   Matrix symbols

   b   = byte operation            r8  = byte register
   dir = direct                    r16 = word register (dword if 32-bit)
   ib  = immediate byte            r/m = effective address is second byte
   iw  = immediate word            sb  = immediate byte sign-extended
   ind = indirect                  sho = short
   f   = far, i.e. intersegment    Sr  = segment register
   m   = memory                    w   = word operation

      +---------------------------------------------------------------+
      | mod.r/m | 000  | 001 | 010  | 011  | 100  | 101  | 110  | 111 |
      |---------+------+-----+------+------+------+------+------+-----|
      | Immed   | ADD  | OR  | ADC  | SBB  | AND  | SUB  | XOR  | CMP |
      | Shift   | ROL  | ROR | RCL  | RCR  | SHL  | SHR  | -    | SAR |
      | Grp 1   | TEST | -   | NOT  | NEG  | MUL  | IMUL | DIV  | IDIV|
      | Grp 2   | INC  | DEC | CALL | CALL | JMP  | JMP  | PUSH | -   |
      |         |      |     | ind  |f ind | ind  |f ind |      |     |
      +---------------------------------------------------------------+