Add two 16-bits number with ADD and ADC instruction

Add two 16-bits number with ADD and ADC instruction

LHLD 2501H : "Get 1st 16-bit number in H-L pair"
XCHG : "Save 1st 16-bit number in DE"
LHLD 2503H : "Get 2nd 16-bit number in H-L pair"
MOV A, E : "Get lower byte of the 1st number"
ADD L : "Add lower byte of the 2nd number"
MOV L, A : "Store result in L-register"
MOV A, D : "Get higher byte of the 1st number"
ADC H : "Add higher byte of the 2nd number with CARRY"
MOV H, A : "Store result in H-register"
SHLD 4004H : "Store 16-bit result in memory locations 2505H and 2506H"
HLT : "Stop"

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