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.
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.