Question

Write ALP to find 2's complement of a 16 bit number stored in DE Pair. Store result in HL Pair.

Answer 1

Mnemonics		Comment
Opcode	Operand
MOV A, E		; Copy E content to Accumulator
CMA		; Compliment Accumulator
MOV L, A		; Copy Accumulator to L Register
MOV A, D		; Copy D content to Accumulator
CMA		; Compliment Accumulator
MOV H, A		; Copy Acc. to HL Pair
INX H		; Increment HL pair by 1
RST 1.0		; Restart