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8085 Program to give 2's complement of a number

Aim - Write an assembly language program to give 2's complement of a number stored in memory location 2000H. Store the result in memory location 2001H.

Address Instruction Name Opcode
C000 LDA 2000H 3A 00 20
C003 CMA 2F
C004 INR A 3C
C005 STA 2001H 32 01 20
C008 HLT 76

Input

Address Data
2000 05

Output

Address Data
2001 FB

2's complement solving

0 5 > 0000 0101
1s Complement > 1111 1010
2s Complement > 1111 1011
1111 1011 > F B