22. Simplified Multibyte Instructions (not x86!)

• Instruction

          mov ax, [1000h] ; load AX register from memory location 1000h
  

  loads the AX register from memory location 1000h.

• The encoding for the opcode is 110 00 110, or 0C6h.

• Another encoding,

          mov ax, [2000h] ; load AX register from memory location 2000h
  

  is exact same 0C6h, because none of the opcode fields store the memory address.

• To accommodate 16-bit address or a constant value, we must add two more bytes to the instruction opcode.