ATPPC(4) | Device Drivers Manual | ATPPC(4) |
atppc
— driver for
AT-style parallel port chip sets
atppc* at acpi?
atppc* at isa? port 0x378 irq 7 drq 3 flags 0x00
atppc* at isapnp?
atppc* at ofisa?
atppc* at pnpbios? index ?
atppc* at puc? port ?
options ATPPC_VERBOSE
options ATPPC_DEBUG
atppc
supports parallel ports and provides
the low level support needed by higher level drivers such as
ppbus(4). This driver attaches
where the traditional NetBSD
lpt(4) driver would ordinarily.
It provides the data transport and chip set manipulation needed by higher
driver layers, such as ppbus(4)
and lpt(4). This driver is
designed to be one of many possible implementations supporting machine
independent parallel device support via
ppbus(4).
atppc
is intended to provide to data-link
like services to higher level IEEE 1284 device drivers (such as
ppbus(4)).
atppc
does not directly support IEEE 1284 features
such as mode negotiation but rather provides the necessary infrastructure to
allow a higher level driver to provide these services.
atppc
does provide chip set manipulation,
device handshakes (where appropriate), low-level error detection, and data
transfer.
atppc
supports the following data transfer
modes: Centronics Compatible (Standard), Nibble, Byte (PS2), Fast
Centronics, ECP, and EPP. Standard and Fast Centronics modes are write only,
Nibble and Byte modes are read only, and ECP and EPP modes are
bidirectional.
acpi(4), i386/pnpbios(4), isa(4), isapnp(4), lpt(4), ofisa(4), ppbus(4), puc(4)
The atppc
driver is based on the
ppc
driver, which originally appeared in
FreeBSD. The driver was ported over in
NetBSD 2.0.
This manual page is based on the FreeBSD
ppc
manual page. The information has been updated
for the NetBSD port by Gary
Thorpe.
The FreeBSD driver includes support for some specific chip sets, specifically detection of some non-standard device I/O locations on the ISA bus. This support was not ported over to the NetBSD version of the driver yet.
August 31, 2018 | NetBSD 10.99 |