.\"	$OpenBSD: dvbox.4,v 1.4 2004/09/30 19:59:26 mickey Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
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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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.\"     from: @(#)dv.4	8.1 (Berkeley) 6/9/93
.\"
.Dd March 16, 2003
.Dt DVBOX 4 hp300
.Os
.Sh NAME
.Nm dvbox
.Nd
.Tn HP98730
.Dq DaVinci
frame buffer
.Sh SYNOPSIS
.Cd "dvbox* at intio?"
.Cd "dvbox* at dio?"
.Cd "grf*   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 grf 4
driver, and the associated
.Xr ite 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.
At the internal address it will be the ``preferred'' console device
(see
.Xr cons 4 ) .
The hardware installation manual describes the procedure for
setting these values.
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr gbox 4 ,
.Xr grf 4 ,
.Xr hyper 4 ,
.Xr intro 4 ,
.Xr rbox 4 ,
.Xr topcat 4
.Sh BUGS
This driver has not been tested with all possible combinations of frame
buffer boards and scan boards installed in the device.