** There are over a hundred instructions in the instruction set for the 806 CPU; there are also instructions especially for the more advanced processors. In this section we discuss six of the most useful instructions for transferring data and doing arithmetic. The instructions we present can be used with either byte or word operands.
In the following, WORD1 and WORD2 are word variables, and BYTE1 and BYTE2 are byte variables. Recall from chapter 3 that AH is the high byte of register AX, and BL is the low byte of BX.