ATPPC(4) BSD Kernel Interfaces 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 ?
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 pos-
sible implementations supporting machine independent parallel device support via ppbus(4).
IEEE 1284 support
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.
Supported data transfer modes
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.
BSD January 30, 2004 BSD