.\"	$NetBSD: atppc.4,v 1.16 2018/08/31 19:36:28 sevan Exp $
.\"
.\" Copyright (c) 1998, 1999, Nicolas Souchu
.\" Copyright (c) 2003, 2004 Gary Thorpe <gathorpe@users.sourceforge.net>
.\" All rights reserved.
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.Dd August 31, 2018
.Dt ATPPC 4
.Os
.Sh NAME
.Nm atppc
.Nd driver for AT-style parallel port chip sets
.Sh SYNOPSIS
.Cd "atppc* at acpi?"
.Cd "atppc* at isa? port 0x378 irq 7 drq 3 flags 0x00"
.Cd "atppc* at isapnp?"
.Cd "atppc* at ofisa?"
.Cd "atppc* at pnpbios? index ?"
.Cd "atppc* at puc? port ?"
.Cd options ATPPC_VERBOSE
.Cd options ATPPC_DEBUG
.Sh DESCRIPTION
.Nm
supports parallel ports and provides the low level support needed
by higher level drivers such as
.Xr ppbus 4 .
This driver attaches where the traditional
.Nx
.Xr lpt 4
driver would ordinarily.
It provides the data transport and chip set manipulation needed by
higher driver layers, such as
.Xr ppbus 4
and
.Xr lpt 4 .
This driver is designed to be one of many possible implementations
supporting machine independent parallel device support via
.Xr ppbus 4 .
.Ss IEEE 1284 support
.Nm
is intended to provide to data-link like services to higher level
IEEE 1284 device drivers (such as
.Xr ppbus 4 ) .
.Nm
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.
.Pp
.Nm
does provide chip set manipulation, device handshakes (where
appropriate), low-level error detection, and data transfer.
.Ss Supported data transfer modes
.Nm
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.
.\" .Sh FILES
.\" .Sh EXAMPLES
.Sh SEE ALSO
.Xr acpi 4 ,
.Xr i386/pnpbios 4 ,
.Xr isa 4 ,
.Xr isapnp 4 ,
.Xr lpt 4 ,
.Xr ofisa 4 ,
.Xr ppbus 4 ,
.Xr puc 4
.Sh HISTORY
The
.Nm
driver is based on the
.Nm ppc
driver, which originally appeared in
.Fx .
The driver was ported over in
.Nx 2.0 .
.Sh AUTHORS
This manual page is based on the
.Fx
.Nm ppc
manual page.
The information has been updated for the
.Nx
port by
.An "Gary Thorpe" .
.Sh BUGS
The
.Fx
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
.Nx
version of the driver yet.