NetBSD/share/man/man4/man4.atari/et.4

.\"     $NetBSD: et.4,v 1.7 1999/12/17 16:23:23 abs Exp $
.\"
.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" 
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Julian Coleman.
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.Dd Jul 30, 1998
.Dt ET 4 atari
.Sh NAME
.Nm et
.Nd ET4000 graphics driver
.Sh SYNOPSIS
.Cd "et0 at vme0"
.Sh DESCRIPTION
The
.Nm ""
device driver supports the Crazy Dots II VME graphics card, which is 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.
.Pp
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:
.Bd -unfilled -offset indent
.Bl -column "Value " "Clock"
.Em "Value	Clock"
.It 0x00	14318
.It 0x10	16257
.It 0x17	20000
.It 0x0c	24000
.It 0x04	25175
.It 0x14	28332
.It 0x18	32514
.It 0x1a	36000
.It 0x1c	40000
.It 0x03	44900
.It 0x0f	50000
.It 0x13	50344
.It 0x07	56644
.It 0x11	65028
.It 0x1f	80000
.El
.Sh HARDWARE
Cards supported by the
.Nm
driver include:
.Pp
.Bl -item -compact
.It
Crazy Dots II VME graphics card
.El
.Sh FILES
.Bl -tag -width "xxxxxxxxxx" -compact
.It Pa /dev/etvme
.El
.Sh AUTHOR
.An Julian Coleman
.Sh BUGS
The driver does not support a text mode, so cannot be used as a console.