Main program:

4000H     LXI SP, 27FFH

4003H     LXI H, 2000H

4006H     LXI B, 1020H

4009H     CALL SUB

400CH     HLT

Subroutine program:

4100H     SUB: PUSH B

4101H     PUSH H

4102H     LXI B, 4080H

4105H     LXI H, 4090H

4108H     SHLD 2200H

4109H     DAD B

410CH     POP H

410DH     POP B

410EH     RET

Note:

The table given gives the instruction sequence and the contents of all registers and stack after execution of each instruction.

TABLE