# Why Do We Have 6 Bit And 8 Bit BCD Code?

## Why BCD code is used?

The main advantage of the Binary Coded Decimal system is that it is a fast and efficient system to convert the decimal numbers into binary numbers as compared to the pure binary system.

But the BCD code is wasteful as many of the 4-bit states (10-to-16) are not used but decimal displays have important applications..

## What is BCD switch?

A Thumbwheel Switch is a setting switch that converts the numeric value selected by turning a disk-shaped part on which numbers are written into a binary, decimal, hexadecimal, or other code using the combination of ON and OFF signals for multiple contact circuits and that outputs the resulting code.

## 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.

## 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 does BCD mean?

Bolt Circle DiameterBolt Circle Diameter (BCD) is the diameter of an imaginary circle running through the center of the chainring mounting holes. It is always defined in millimeters.

## 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 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.

## Why is there 8 bits in a byte?

The byte was originally the smallest number of bits that could hold a single character (I assume standard ASCII). We still use ASCII standard, so 8 bits per character is still relevant. This sentence, for instance, is 41 bytes. That’s easily countable and practical for our purposes.

## What is BCD code example?

Short for binary-coded decimal, BCD is also known as packet decimal and is numbers 0 through 9 converted to four-digit binary. 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.