Find the 1’s complement of a Number in 8085

In this program, we are going to write an assembly language program to Find the 1’s complement of a Number in 8085 microprocessor with a program flow chart and explanation of the program.

1’s complement of a Number in 8085

Program Statement

Find the 1’s complement of the number stored at memory location C200H and store the complemented number at memory location C300H.

Explanation of Program

• 1’s complement of a number means to invert each bit of that number. So our task is to complement each bit of the number.
• We will first load the number in the accumulator whose 1’s complement is to be found.
• Then using CMA instruction we will complement the accumulator. This is 1’s complement of the number.
• Store the result at memory location C300H.
  • Let A = AAH
  • i.e. A: 10101010
  • 1’s complement of A: 01010101
  • Thus, 1’s complement of A is 55H.

Assembly Language Program

Instruction	Comments	Operation
LDA C200H	Load the number in the accumulator from the C200H memory address.	A = AA H
CMA	Complement the number	A = 55 H
STA C300H	Store the 1’s complement of the number at memory location C300H.	C300H = H
HLT	Terminate program execution	Stop

Flow Chart of Program

Sr. No.	Name of the 8085 Programs
1.	Write a program to load the data into the accumulator and any register.
2.	Write a program to exchange the contents of memory locations.
3.	Add two 8-bit numbers.
4.	Subtract two 8-bit numbers.
5.	Add two 16-bit numbers.
6.	Subtract two 16-bit numbers
7.	Find the 1’s complement of a Number
8.	Find the 2’s complement of a Number
9.	8085 Program To Mask The Lower Nibble
10.	8085 Program To Mask The Upper Nibble
11.	8085 program to pack the two unpacked BCD numbers
12.	8085 program to Unpack the two packed BCD numbers
13.	8085 program to find the sum of a series of 8-bit numbers
14.	8085 Program to sort the numbers in ascending order
15.	8085 Program to sort the numbers in Descending order
16.	8085 Program to Multiply Two 8-bit Numbers
17.	8085 Program to Divide 16-bit number by 8-bit number
18.	8085 Program to Find the Number of Negative Numbers in Array
19.	8085 Program to Find Maximum Number in Array
20.	8085 Program to count the number of 1’s in a register