96 lines
3.5 KiB
Groff
96 lines
3.5 KiB
Groff
.\" $Id: iwm.4,v 1.5 2000/07/05 16:13:50 msaitoh Exp $
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.\"
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.\" Copyright (c) 1997, 1998 Hauke Fath. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 6, 1998
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.Dt IWM 4 mac68k
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.Os
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.Sh NAME
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.Nm iwm ,
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.Nm fd
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.Nd floppy disk driver for IWM and non-DMA SWIM controllers.
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.Sh SYNOPSIS
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.Cd "iwm0 at obio?"
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.Cd "fd* at iwm0 drive ?"
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.Sh DESCRIPTION
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The
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.Nm
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driver interfaces to the built-in and external floppy disk drives on the
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Macintosh. It supports double-density media, written in
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Apple's proprietary GCR format. Currently, there is no disklabel
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support for the floppy drives. Instead, the
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.Nm
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driver sets up a fake in-core disklabel, using the minor device
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number to select from the supported disk formats.
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.Pp
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The following formats are supported:
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.Bl -column header Partition Size sides tracks sectors/track
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.Sy "Partition Size sides tracks sectors/track"
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a 800Kb 2 80 10 (default)
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b 400Kb 1 80 10
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c 800Kb 2 80 10
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.El
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.Pp
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(The above table describes the logical mapping as implemented by the
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driver; the physical layout of GCR floppies has 8..12 sectors per track.)
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.\"
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.Sh FORMATTING
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The
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.Nm
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driver does currently not support floppy disk formatting.
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.\"
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.Sh SEE ALSO
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.\" Cross-references should be ordered by section (low to high), then in
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.\" alphabetical order.
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Apple Computer, Inc.: "Inside Macintosh", Vol III-33f. (Addison-Wesley)
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.Pp
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Apple Computer, Inc.: "New Technical Notes DV 17 - Sony Driver"
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.Pp
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Neil Parker: "iwmstuff"
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.Pp
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.Xr eject 1
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.\"
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.Sh HISTORY
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The
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.Nm
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interface first appeared in
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.Nx 1.4 .
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.\"
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.Sh AUTHORS
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Hauke Fath put together the beginnings of the
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.Nm
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driver in 1996 from the sparse documentation in "Inside Macintosh",
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Neil Parker's "iwmstuff" documentation for the Apple IIgs and a long,
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hard look at the .Sony driver.
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.\"
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.Sh BUGS
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The FFS code is incapable of dealing with a varying number of
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sectors per track. We have to fake a mapping and so lose FFS support
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for hardware parameters like transition times.
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.Pp
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The driver only supports an obsolete format.
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