Although this was once a popular number base, especially in the Digital Equipment Corporation PDP/8 and other old computer systems, it is rarely used today. The Octal system is based on the binary system with a 3-bit boundary. The Octal Number System:

• uses base 8


• includes only the digits 0 through 7 (any other digit would make the number an invalid octal number)

The weighted values for each position is as follows: