The hexal system is used for showing long bit numbers as example as assembler-programming for I/O-addresses.
| decimal system | binary system | octal system | hexal system |
|---|---|---|---|
| 0 | 0.000 | 00 | 00 |
| 1 | 000.001 | 01 | 01 |
| 2 | 000.010 | 02 | 02 |
| 3 | 000.011 | 03 | 03 |
| 4 | 000.100 | 04 | 04 |
| 5 | 000.101 | 05 | 05 |
| 6 | 000.110 | 06 | 06 |
| 7 | 000.111 | 07 | 07 |
| 8 | 001.000 | 10 | 08 |
| 9 | 001.001 | 11 | 09 |
| 10 | 001.010 | 12 | A |
| 11 | 001.011 | 13 | B |
| 12 | 001.100 | 14 | C |
| 13 | 001.101 | 15 | D |
| 14 | 001.110 | 16 | E |
| 15 | 001.111 | 17 | F |
| 16 | 010.000 | 21 | 10 |
Hexal system