IWM(4) | Device Drivers Manual (mac68k) | IWM(4) |
iwm
, fd
—
iwm0 at obio?
fd* at iwm0 drive ?
iwm
driver interfaces to the built-in and external
floppy disk drives on the Macintosh. It supports double-density media, written
in Apple's proprietary GCR format. Currently, there is no disklabel support
for the floppy drives. Instead, the iwm
driver sets up
a fake in-core disklabel, using the minor device number to select from the
supported disk formats.
The following formats are supported:
Partition | Size | sides | tracks | sectors/track |
a | 800Kb | 2 | 80 | 10 (default) |
b | 400Kb | 1 | 80 | 10 |
c | 800Kb | 2 | 80 | 10 |
(The above table describes the logical mapping as implemented by the driver; the physical layout of GCR floppies has 8..12 sectors per track.)
iwm
driver does currently not support floppy disk
formatting.
Apple Computer, Inc.: "New Technical Notes DV 17 - Sony Driver"
Neil Parker: "iwmstuff"
iwm
interface first appeared in
NetBSD 1.4.
iwm
driver
in 1996 from the sparse documentation in "Inside Macintosh", Neil
Parker's "iwmstuff" documentation for the Apple IIgs and a long,
hard look at the .Sony driver.
The driver only supports an obsolete format.
June 6, 1998 | NetBSD 9.4 |