Subtract two 8-bit numbers
- LXI H, 2501H : "Get address of first number in H-L pair. Now H-L points to 2501H"
- MOV A, M : "Get first operand in accumulator"
- INX H : "Increment content of H-L pair. Now, H-L points 2502H"
- SUB M : "Subtract first to second operand"
- INX H : "H-L points 4002H"
- MOV M, A : "Store result at 2503H"
- HLT : "Stop"
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