freebsd-dev/share/man/man4/man4.i386/fdc.4

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.\" Copyright (c) 1994 Wilko Bulte
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.\"	$Id: fdc.4,v 1.8 1997/02/22 13:25:23 peter Exp $
.\"
.Dd August 31, 1994
.Dt FDC 4 i386
.Os FreeBSD
.Sh NAME
.Nm fdc
.Nd
PC architecture floppy disk controller driver
.Sh SYNOPSIS
.Cd "controller fdc0 at isa? port" \&"IO_FD1\&" bio "flags 0x1" "irq 6" "drq 2" "vector fdintr"
.Cd "disk fd0 at fdc0 drive 0
.Cd "disk fd1 at fdc0 drive 1
.Pp
For QIC40 and QIC80 tapedrives controlled by the floppy controller:
.Cd "tape ft0 at fdc0 drive 2
.Sh DESCRIPTION
This driver provides access to floppy disk drives and QIC40/80 tapedrives.
In /dev for each floppy device a number of minor devices are present. The
/dev/fd* devices with trailing alphabetic characters are used to indicate
'partitions' on the floppy disk. The /dev/fd*.<number> are devices that
indicate the size of the floppy disk (so: 720kB, 1440kB etc). The latter
are used for formatting disks using fdformat or for accessing different
density disks in multidensity drive. Example: 720kB disk in a 1.44Mb drive.
.Pp
Normally, the driver will ask the system's CMOS memory to obtain the
floppy drive configuration.  Some machines do not store any form of a
configuration value in their CMOS.  Use the flags value
.Ql 0x1
to pretend a 1.44 MB floppy drive as the first unit, without asking the
CMOS for it.
.Sh FILES
.Bl -tag -width Pa -compact
.It /dev/fd*
floppy disk device nodes
.It /dev/fd*.<size in kB>
floppy disk device nodes where the trailing number indicates the floppy 
capacity 
.It /dev/ft*
floppy tape (QIC40/80) device nodes
.It Pa /sys/i386/conf/GENERIC
sample generic kernel config file 
.It Pa /sys/i386/isa/fd.c
floppy driver source 
.It Pa /sys/i386/isa/ft.c
floppy tape (QIC40/80 driver source
.El
.Sh SEE ALSO
.Xr fdformat 1 ,
.Xr disktab 5 ,
.Xr ft 8