.\"	$OpenBSD: dvbox.4,v 1.10 2008/03/26 08:11:08 jmc Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
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.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
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.\" modification, are permitted provided that the following conditions
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.\"    may be used to endorse or promote products derived from this software
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.\"     from: @(#)dv.4	8.1 (Berkeley) 6/9/93
.\"
.Dd $Mdocdate: March 26 2008 $
.Dt DVBOX 4 hp300
.Os
.Sh NAME
.Nm dvbox
.Nd
.Tn HP98730
DaVinci frame buffer
.Sh SYNOPSIS
.Cd "dvbox*     at intio?"
.Cd "dvbox*     at dio?"
.Cd "wsdisplay* at dvbox?"
.Sh DESCRIPTION
The
.Tn HP98730
and
.Tn HP98731
are stackable 4-bit color frame buffers,
also known as the DaVinci.
By adding up to 7
.Tn HP98732A
frame buffer extensions, it is possible to add overlay planes.
.Pp
The
.Nm
driver provides a frame buffer abstraction to the
.Xr wscons 4
console framework.
.Pp
The DaVinci can be configured at either the ``internal'' address
(frame buffer address 0x200000, control register space address 0x560000)
or at an external select code less than 32.
The hardware installation manual describes the procedure for
setting these values.
.Sh SEE ALSO
.Xr dio 4 ,
.Xr intro 4 ,
.Xr wscons 4 ,
.Xr wsdisplay 4
.Sh BUGS
This driver has not been tested with all possible combinations of frame
buffer boards and scan boards installed in the device.