Add Even Parity to a String of 7-bit ASCII Characters in 8085

Here we will see how to add even parity to 7-bit ASCII string using 8085.

Problem Statement

Write a program to add even parity to a string of 7 bit ASCII characters. The length of the string is in memory location 8040 H and the string itself begins at memory location 8041 H. Place even parity in the most significant bit of each character.

Discussion

8085 has parity flat. that flag will be used to check and assign parity with each ASCII character. At first we will clear the most significant bit by masking the number with 7FH. Then use OR instruction, as this effects on parity flag. If the parity is even, then skip, otherwise set most significant bit as 1. This process will repeat until the string is not exhausted.

Input

Flow Diagram

Program

Output