Add two 16-bits numbers with DAD instruction

Add two 16-bits numbers with DAD instruction

LHLD 2501H : "Get 1st 16-bit number"
XCHG : "Save 1st 16-bit number in DE"
LHLD 2503H : "Get 2nd 16-bit number in H-L"
DAD D : "Add DE and HL"
SHLD 2505H : "Store 16-bit result in memory locations 2505H and 2506H".
HLT : "Stop"

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