Add Two Multi-Byte BCD Numbers in 8085

Now let us see a program of Intel 8085 Microprocessor. This program is mainly for adding multi-digit BCD (Binary Coded Decimal) numbers.

Problem Statement

Write 8085 Assembly language program to add two multi-byte BCD (Binary Coded Decimal) numbers. 

Discussion

We are using 4-byte BCD numbers. The numbers are stored into the memory at location 8501H and8505H. One additional information is stored at location 8500H. In this place, we are storing the byte count. The result is stored at location 85F0H.

The HL pair is storing the address of first operand bytes, the DE is storing the address of second operand bytes. C is holding the byte count. We are using the stack to store the intermediate bytes of the result. After completion of the addition operation, we are popping from the stack and storing into the destination.

Input

Flow Diagram

Program

Output