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+.\"     $NetBSD: et.4,v 1.14 2009/03/11 13:41:25 joerg Exp $
+.\"
+.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Julian Coleman.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 30, 1998
+.Dt ET 4 atari
+.Os
+.Sh NAME
+.Nm et
+.Nd driver for ET4000 VME graphics cards
+.Sh SYNOPSIS
+.Cd "et0 at vme0"
+.Sh DESCRIPTION
+The
+.Nm
+device driver supports VME graphics cards based on the Tseng ET4000 chipset.
+It supports the minimal ioctl's needed to run X11.  The 8Kb control registers
+are mapped from offset 0x0 to offset 0x1fff and the 1MB frame buffer is mapped
+from offset 0x400000 to offset 0x4fffff.  VGA compatible memory is mapped from
+offset 0xa0000 to offset 0xc0000.
+.Sh HARDWARE
+Cards supported by the
+.Nm
+driver include:
+.Pp
+.Bl -item -compact
+.It
+Crazy Dots II VME graphics card
+.El
+.Sh NOTES
+The clock generator on the Crazy Dots card is an ICS 1394M.  Setting the
+clock is done by writing to a register at offset 0x0.  This address cannot
+be read.  The values that can be written to the register and the associated
+clock are:
+.Bl -column "Value " "Clock" -offset indent
+.It Em Value Ta Em Clock
+.It Li 0x00 Ta
+14318
+.It Li 0x10 Ta
+16257
+.It Li 0x17 Ta
+20000
+.It Li 0x0c Ta
+24000
+.It Li 0x04 Ta
+25175
+.It Li 0x14 Ta
+28332
+.It Li 0x18 Ta
+32514
+.It Li 0x1a Ta
+36000
+.It Li 0x1c Ta
+40000
+.It Li 0x03 Ta
+44900
+.It Li 0x0f Ta
+50000
+.It Li 0x13 Ta
+50344
+.It Li 0x07 Ta
+56644
+.It Li 0x11 Ta
+65028
+.It Li 0x1f Ta
+80000
+.El
+.Sh FILES
+.Bl -tag -width "xxxxxxxxxx" -compact
+.It Pa /dev/etvme
+.El
+.Sh AUTHORS
+.An Julian Coleman
+.Sh BUGS
+The driver does not support a text mode, so cannot be used as a console.