Home

Subtraction of two BCD numbers

Statement: Subtract the BCD number stored in E register from the number stored in the D register.

Source Program:

MVI A,99H

SUB E : Find the 99's complement of subtrahend

INR A : Find 100's complement of subtrahend

ADD D : Add minuend to 100's complement of subtrahend

DAA : Adjust for BCD

HLT : Terminate program execution

Note: When two BCD numbers are subtracted, we can use DAA instruction for ajusting the result to BCD. Therefore, the subtraction of BCD number is carried out 10's complement or 100's complement.

The 10's complement of a decimal number is equal to the 99's complement plus 1. The 99's complement of a number can be found by subtracting the number from 99.

The steps for finding 100's complement BCD subtraction are :

Find the 100's complement of subtrahend
Add two numbers using BCD adition

Related Programs (Click down)

Find the negative numbers in a block of data.

Find the largest of given numbers

Count number of one's in a number

Arrange in ascending order

Add two 4-digit BCD numbersStatement: Add two 4 digit BCD numbers in HL and DE register pairs and store result in memory locati...Multiply two 2-digit BCD numbersStatement: Write an assembly language program to multiply 2 BCD numbers So...Write an 8086 Program to add two packed BCD numbers entered through keyboardWrite an 8086 program that adds two packed BCD numbers input from the keyboard and computes and...Pack the unpacked BCD numbersStatement: Pack the two unpacked BCD numbers stored in memory locations 4200H and 4201H and store re...Add two 16-bit numbersStatement: Add the 16-bit number in memory locations 4000H and 4001H to the 16-bit number in memory ...Add two decimal numbers of 6 digit eachStatement: Two decimal numbers six digits each, are stored in BCD package form. Each number occupies...Data network echo cancellationThe popularity of the Internet in the world led to an explosion of innovation and application develo...Multiply two 8-bit numbersStatement: Multiply two 8-bit numbers stored in memory locations 2200H and 2201H by repetitive addit...Add two 8-bit numbersStatement: Add the contents of memory locations 4000H and 4001H and place the result in memory locat...Subtract two 16-bit numbersStatement: Subtract the 16-bit number in memory locations 4002H and 4003H from the 16-bit number in ...Subtract two 8-bit numbersStatement: Subtract the contents of memory location 4001H from the memory location 2000H and place t...Two BCD code input D -A converter circuitMay not use or make it difficult , BCD input of D / A converter circuit is also rare , but in practi...FREE PROGRAMS FOR 8085 MICROPROCESSOR// PROGRAMS FOR 8085 MICROPROCESSOR LEARNERS Store 8-bit data in memory of 8085 microproce...Separate even numbers from given numbersStatement: Write an assembly language program to separate even numbers from the given list of 50 num...Multiply two eight bit numbers with shift and add methodStatement: Multiply the 8-bit unsigned number in memory location 2200H by the 8-bit unsigned number ...Synchronizing and control circuit networkGrid is the quasi- period generator excitation in Canada (the load voltage) case, in strict accordan...2-Digit BCD to binary conversionStatement: Convert a 2-digit BCD number stored at memory address 2200H into its binary equivalent nu...Two-way remote car door lock system circuit Abstract: This paper describes RF-based wireless transceiver SoC nRF9E5 system framework, the...Two-way remote car door lock system circuit Abstract: This paper describes RF-based wireless transceiver SoC nRF9E5 system framework, the...Unpack a BCD numberStatement: Two digit BCD number is stored in memory location 4200H. Unpack the BCD number and store ...

Free Electronic projects & 8085 projects

Recent Projects

Subtraction of two BCD numbers