# What Are BCD Numbers?

## Why BCD is called 8421 code?

BCD Codes.

The BCD8421 code is so called because each of the four bits is given a ‘weighting’ according to its column value in the binary system.

The least significant bit (lsb) has the weight or value 1, the next bit, going left, the value 2..

## What is BCD and GREY code?

Binary Coded Decimal (BCD) is a way to store the decimal numbers in binary form. The number representation requires 4 bits to store every decimal digit (from 0 to 9). Since there are 10 different combinations of BCD, we need at least a 4-bit Gray Code to create sufficient number of these combinations.

## Is BCD a self complementing code?

The weights of this code are 2, 4, 2 and 1. … Sum of weights of unnatural BCD codes is equal to 9. It is a self-complementing code. Self-complementing codes provide the 9’s complement of a decimal number, just by interchanging 1’s and 0’s in its equivalent 2421 representation.

## What is BCD file in Windows?

Boot Configuration Data (BCD) is a firmware-independent database for boot-time configuration data. It is used by Microsoft’s new Windows Boot Manager and replaces the boot. ini that was used by NTLDR. … For UEFI boot, the file is located at /EFI/Microsoft/Boot/BCD on the EFI System Partition.

## What is BCD code example?

Decimal to BCD code conversion examples Example 1: The direct conversion of the decimal number 85 to binary is: 8510 = 10101012. … Example 2: The direct conversion of the decimal number 568 to binary is: 56810 = 10001110002.

## What is 2421 BCD code?

The Aiken code (also known as 2421 code) is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table.

## How many bits is a BCD code?

four bitsBCD encodes each decimal digit with its binary equivalent using four bits. So decimal digits are simply represented in four bits by their direct binary values. A disadvantage of this is that only 10 of the possible 16 (24) codes that four bits can produce are used.

## How do I add a BCD number?

At first the decimal equivalent of the given Binary Coded Decimal (BCD) codes are found out. Then the 9’s compliment of the subtrahend is done and then that result is added to the number from which the subtraction is to be done. If there is any carry bit then the carry bit may be added to the result of the subtraction.

## How do you write 5211 BCD code?

A decimal number is represented in 4-bit form and the total four bits weight is 5 + 2 + 1 + 1 = 9. Hence the 5211 code represents the decimal numbers from 0 to 9. A code is said to be reflective when code for 9 is complement for the code for 0, and so is for 8 and 1 codes, 7 and 2, 6 and 3, 5 and 4.

## How do you write 25 in BCD?

Using this conversion, the number 25, for example, would have a BCD number of 0010 0101 or 00100101. However, in binary, 25 is represented as 11001. BCD was used in some of the early decimal computers, and the IBM System/360 series systems.

## How do you convert BCD to binary?

BCD to Binary ConversionStep 1 – Convert to BCD. BCD Number − (00101001)BCD Calculating Decimal Equivalent. Convert each four digit into a group and get decimal equivalent for each group. … Step 2 – Convert to Binary. Used long division method for decimal to binary conversion. Decimal Number − 2910

## What is a BCD value?

Binary coded decimal (BCD) is a system of writing numerals that assigns a four-digit binary code to each digit 0 through 9 in a decimal (base-10) numeral. The four-bit BCD code for any particular single base-10 digit is its representation in binary notation, as follows: 0 = 0000. 1 = 0001.

## Where is BCD used?

BCD was used in many early decimal computers, and is implemented in the instruction set of machines such as the IBM System/360 series and its descendants, Digital Equipment Corporation’s VAX, the Burroughs B1700, and the Motorola 68000-series processors.

## What is a weighted code?

WEIGHTED CODES • IN WEIGHTED CODE , EACH DIGIT POSITION HAS A WEIGHT OR VALUE. THE SUM OF ALL DIGITS MULTIPLIED BY A WEIGHT GIVES A TOTAL AMOUNT BEING REPRESENTED. • BCD OR 8421 IS A TYPE OF WEIGHTED CODE WHERE EACH DIGIT POSITION IS ASSIGNED A SPECIFIC WEIGHT.