By default, ISA parallel drivers are not configured into the kernel, so you must configure ISA parallel cards using the Hardware/Kernel Manager or mkdev parallel. ISA parallel ports configured in the system are assigned device nodes /dev/lp0, /dev/lp1, and /dev/lp2, respectively.
By default, the system is configured to support up to two PCI parallel ports. PCI parallel ports are detected at boot-time; the first port that is detected is assigned device node /dev/lp3, the second /dev/lp4, and so forth. (Note that ports beyond /dev/lp4 are ignored unless you run the Hardware/Kernel Manager or mkdev parallel to increase the number of allowed PCI parallel ports.
``Parallel port addresses and interrupts'' lists the addresses and interrupts associated with the different types of parallel ports:
Parallel port addresses and interrupts
| Bus | Physical | Device | IRQ | Base I/O |
|---|---|---|---|---|
| type | port | name | vector | address |
| ISA | LPT1 | /dev/lp0 | 7 | 0x378 |
| LPT2 | /dev/lp1 | 5 | 0x3bc | |
| EISA | LPT1 | /dev/lp0 | 7 | 0x378 |
| LPT2 | /dev/lp1 | 5 | 0x3bc | |
| LPT3 | /dev/lp2 | 5 | 0x278 | |
| MCA | LPT1 | /dev/lp0 | 7 | 0x378 |
| LPT2 | /dev/lp1 | 7 | 0x3bc | |
| LPT3 | /dev/lp2 | 7 | 0x278 | |
| PCI | 1st port | /dev/lp3 | N/A | N/A |
| 2nd port | /dev/lp4 | N/A | N/A |
See also: