Biquinary decimal code
Biquinary decimal code ( English bi-quinary decimal code ) refers to a numerical coding system in computer science that was used in many abacuses and early computers , such as the Colossus and UNIVAC . The designation biquinary indicates that the coding is based on a binary component and a quinary component.
Many different variations of this coding scheme were used during the pioneering days of computing. The coding was later standardized by BCD , excess 3 code and other coding systems.
| Example for the IBM 650 code | ||||
|---|---|---|---|---|
| Decimal digit |
05-01234 bit | |||
| 0 | 10-10000 | |||
| 1 | 10-01000 | |||
| 2 | 10-00100 | |||
| 3 | 10-00010 | |||
| 4th | 10-00001 | |||
| 5 | 01-10000 | |||
| 6th | 01-01000 | |||
| 7th | 01-00100 | |||
| 8th | 01-00010 | |||
| 9 | 01-00001 | |||
| Example of the Remington Rand 409 code | ||||
|---|---|---|---|---|
| Decimal digit |
5 bit four 'quinary' bits (1 3 5 7), one 'bi' bit (9) |
|||
| 0 | 00000 | |||
| 1 | 10,000 | |||
| 2 | 10001 | |||
| 3 | 01000 | |||
| 4th | 01001 | |||
| 5 | 00100 | |||
| 6th | 00101 | |||
| 7th | 00010 | |||
| 8th | 00011 | |||
| 9 | 00001 | |||
| Example for the UNIVAC LARC code | ||||
|---|---|---|---|---|
| Decimal digit |
4 bits one 'bi' bit (5), three 'quinary' bits, one parity bit |
|||
| 0 | 1-0-000 | |||
| 1 | 0-0-001 | |||
| 2 | 1-0-011 | |||
| 3 | 0-0-111 | |||
| 4th | 1-0-110 | |||
| 5 | 0-1-000 | |||
| 6th | 1-1-001 | |||
| 7th | 0-1-011 | |||
| 8th | 1-1-111 | |||
| 9 | 0-1-110 | |||
