8085 program to find 1's and 2's complement of 8-bit number

In this program we will see how to find 1's complement and 2's complement of an 8-bit number.

Problem Statement

Write 8085 Assembly language program to find 1's complement and 2's complement of a number stored in 8000H.

Discussion

8085 has an instruction CMA. This instruction complements the content of Accumulator. For 1's complement CMA instruction is sufficient, and for 2's complement we have to increase the number by 1 after complementing.

We are taking the number from 8000H and storing the 1's complement at location 8050H, and 2's complement to 8051H.

Input

Address
Data
.
.
.
.
.
.
8000
AB
.
.
.
.
.
.


Flow Diagram

Program

Address
HEX Codes
Mnemonics
Comments
F000
3A, 00, 80
LDA 8000H
Load the number from memory
F003
2F
CMA
Complement the accumulator
F004
32, 50, 80
STA 8050H
Store the 1's complemented result
F007
3C
INR A
Increase A by 1
F008
32, 51, 80
STA 8051H
Store the 2's complemented result
F00B
76
HLT
Terminate the program


Output

Address
Data
.
.
.
.
.
.
8050
54
8051
55
.
.
.
.
.
.



Updated on: 30-Jul-2019

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