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Add two 8-bit numbers

Statement: Add the contents of memory locations 4000H and 4001H and place the result in memory location 4002H.

Sample problem

(4000H) = 14H

(4001H) = 89H

Result = 14H + 89H = 9DH

Source program

LXI H 4000H : HL points 4000H

MOV A, M : Get first operand

INX H : HL points 4001H

ADD M : Add second operand

INX H : HL points 4002H

MOV M, A : Store result at 4002H

HLT : Terminate program execution

Flowchart

Note: In Program 1, direct addressing instructions are used, whereas in Program 2, indirect addressing instructions are used.

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Add two 8-bit numbers