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+.\"	$OpenBSD: zx.4,v 1.13 2011/09/03 22:59:07 jmc Exp $
+.\" Copyright (c) 2003 Miodrag Vallat.  All rights reserved.
+.\"
+.\" 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 AUTHOR ``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 AUTHOR 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 $Mdocdate: September 3 2011 $
+.Dt ZX 4 sparc64
+.Os
+.Sh NAME
+.Nm zx
+.Nd accelerated 24-bit color frame buffer
+.Sh SYNOPSIS
+.Cd "zx* at sbus?"
+.Cd "wsdisplay* at zx?"
+.Sh DESCRIPTION
+The ZX and TurboZX
+are dual-slot SBus color frame buffers, with graphics acceleration
+and overlay capabilities.
+They are also known as the
+.Tn Sun
+.Dq Leo
+graphics card.
+.Pp
+The
+.Nm
+driver interfaces the frame buffer with the
+.Xr wscons 4
+console framework.
+It does not provide direct device driver entry points
+but makes its functions available via the internal
+.Xr wsdisplay 4
+interface.
+.Sh DISPLAY RESOLUTION
+The following resolutions are supported by the ZX frame buffer:
+.Bl -column "Resolution" "Refresh Rate" "Details" -offset indent
+.It Sy Resolution Ta Sy "Refresh Rate" Ta Sy "Details"
+.It Li 1280x1024 Ta 76 Hz Ta Non-interlaced
+.It Li 1280x1024 Ta 67 Hz Ta Non-interlaced
+.It Li 1152x900 Ta 76 Hz Ta Non-interlaced
+.It Li 1152x900 Ta 66 Hz Ta Non-interlaced
+.It Li 1024x768 Ta 76 Hz Ta Non-interlaced
+.It Li 1024x768 Ta 60 Hz Ta Non-interlaced
+.\" Is it worth documenting the Stereo and TV modes?
+.It Li 960x680 Ta 112 Hz Ta "Stereo, non-interlaced 56 Hz field rate per eye"
+.It Li 960x680 Ta 108 Hz Ta "Stereo, non-interlaced 54 Hz field rate per eye"
+.It Li 770x575 Ta 50 Hz Ta "Interlaced - PAL"
+.It Li 640x480 Ta 59.94 Hz Ta "Interlaced - NTSC"
+.El
+.Pp
+If the ZX frame buffer is connected to a monitor at boot time, it will
+select its display resolution depending of the monitor
+.Sq select code
+provided by the 13W3 connector.
+If the frame buffer is not connected to a monitor, the default resolution
+of 1152x900, with a 66 Hz refresh rate, will be selected.
+The selected resolutions are:
+.Bl -column "sense code" "Resolution" "Refresh" "Monitor"
+.It Sy Monitor Ta Sy Resolution Ta Sy Refresh Ta Sy Monitor
+.It Sy "sense code" Ta "" Ta Sy Rate Ta Sy Type
+.It Li 0 Ta 1024x768  Ta "76 Hz" Ta "X449A"
+.It Li 1 Ta 1152x900  Ta "66 Hz" Ta ""
+.It Li 2 Ta 1280x1024 Ta "76 Hz" Ta "X248A, GDM-205S"
+.It Li 3 Ta 1152x900  Ta "66 Hz" Ta "GDM-1955A15, GDM-1604A15, CPD-1790"
+.It Li 4 Ta 1280x1024 Ta "67 Hz" Ta "GDM-20D10, GDM-1962"
+.It Li 5 Ta 1152x900  Ta "66 Hz" Ta ""
+.It Li 6 Ta 1152x900  Ta "76 Hz" Ta "GDM-1662B, 17SMM4"
+.It Li 7 Ta 1152x900  Ta "66 Hz" Ta ""
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr sbus 4 ,
+.Xr wscons 4 ,
+.Xr wsdisplay 4
+.Sh CAVEATS
+There is currently no software interface to change the frame buffer
+resolution at runtime.