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+.\" Copyright (c) 1983, 1991 Regents of the University of California.
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     from: @(#)ik.4	6.2 (Berkeley) 3/27/91
+.\"	$Id: ik.4,v 1.1 1995/10/18 08:44:35 deraadt Exp $
+.\"
+.Dd March 27, 1991
+.Dt IK 4 vax
+.Os BSD 4.2
+.Sh NAME
+.Nm ik
+.Nd "Ikonas frame buffer, graphics device interface"
+.Sh SYNOPSIS
+.Cd "device ik0 at uba? csr 0172460 vector ikintr"
+.Sh DESCRIPTION
+The
+.Nm ik
+driver
+provides an interface to an Ikonas frame buffer graphics device.
+Each minor device is a different frame buffer interface board.
+When the device is opened, its interface registers are mapped,
+via virtual memory, into the user processes address space.
+This allows the user process very high bandwidth to the frame buffer
+with no system call overhead.
+.Pp
+Bytes written or read from the device are
+.Tn DMA Ns 'ed
+from or to the interface.
+The frame buffer
+.Tn XY
+address, its addressing mode, etc. must be set up by the
+user process before calling write or read.
+.Pp
+Other communication with the driver is via ioctls.
+The
+.Dv IK_GETADDR
+.Xr ioctl 2
+returns the virtual address where the user process can
+find the interface registers.
+The
+.Dv IK_WAITINT
+.Xr ioctl
+suspends the user process until the ikonas device
+has interrupted (for whatever reason \(em the user process has to set
+the interrupt enables).
+.Sh FILES
+.Bl -tag -width /dev/ikxx -compact
+.It Pa /dev/ik
+.El
+.Sh DIAGNOSTICS
+None.
+.Sh HISTORY
+The
+.Nm
+driver appeared in
+.Bx 4.2 .
+.Sh BUGS
+An invalid access (e.g., longword) to a mapped interface register
+can cause the system to crash with a machine check.
+A user process could possibly cause infinite interrupts hence
+bringing things to a crawl.