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 │      │     │
      └─────────┴──────┴─────┴──────┴──────┴──────┴──────┴──────┴─────┛