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NetBSD 6.1.5 - man page for atppc (netbsd section 4)

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ATPPC(4)			   BSD Kernel Interfaces Manual 			 ATPPC(4)

NAME
     atppc -- driver for AT-style parallel port chip sets

SYNOPSIS
     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

DESCRIPTION
     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.

SEE ALSO
     acpi(4), i386/pnpbios(4), isa(4), isapnp(4), lpt(4), ofisa(4), ppbus(4), puc(4)

HISTORY
     The atppc driver is based on the ppc driver, which originally appeared in FreeBSD.  The
     driver was ported over in NetBSD 2.0.

AUTHORS
     This manual page is based on the FreeBSD ppc manual page.	The information has been updated
     for the NetBSD port by Gary Thorpe.

BUGS
     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
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