LPT(4) BSD Kernel Interfaces Manual LPT(4)
lpt -- parallel port driver
lpt0 at isa? port 0x378 irq 7
lpt1 at isa? port 0x278
lpt2 at isa? port 0x3bc
lpt0 at gsc? irq 7
lpt0 at ssio?
lpt* at apio?
lpt* at ebus?
This driver provides access to parallel ports.
The highest bit in the minor (bit 7, or add 128) number selects whether
to do polling or wait for interrupts. If no IRQ is specified in the ker-
nel configuration, or the IRQ specified is not available at attach time,
only the polling device may be used.
The next lower bit (bit 6, or add 64) indicates the driver should avoid
initializing the printer.
The next lower bit (bit 5, or add 32) requests that the driver do auto-
matic LF generation when printing CRs.
/dev/lpt0 first interrupt-driven parallel port device
/dev/lpa0 first polled parallel port device
intro(4), isa(4), ulpt(4)
BSD May 27, 2017 BSD