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MCD(4)		       FreeBSD Kernel Interfaces Manual			MCD(4)

     mcd -- Mitsumi CD-ROM driver

     device mcd

     In	/boot/device.hints:"isa""0x300""10"

     The mcd driver provides a data and	audio interface	to the Mitsumi-brand
     CD-ROM player.  The CD-ROM	player must be interfaced to the ISA bus
     through one of the	Mitsumi	proprietary controller boards.	The controller
     boards supported are the LU002S, LU005S, the FX001	and the	quite common

     The mcd driver responds to	disk-specific ioctl() commands,	namely the
     DIOCGPART command.	 Other disk-specific ioctl() commands will return an

     The mcd driver also responds to special CD-ROM ioctl() commands.  These
     commands control the CD-ROM player's audio	features.  The commands	are:

	   CDIOCREADSUBCHANNEL	get sub-channel	information on current status
				of disc	playing
	   CDIOCREADTOCHEADER	get table of contents header
	   CDIOCREADTOCENTRYS	gets all of the	table of contents
	   CDIOCPLAYTRACKS	begins audio playing at	location specified
	   CDIOCPLAYBLOCKS	fails with error EINVAL
	   CDIOCPLAYMSF		begins audio playing at	location specified
	   CDIOCRESUME		resumes	playing	a previously paused disc
	   CDIOCPAUSE		pauses a playing disc
	   CDIOCSTART		begins playing a disc
	   CDIOCSTOP		stops a	previously playing disc
	   CDIOCEJECT		opens the disc tray (there is no support for a
				corresponding un-eject command).
	   CDIOCRESET		stops any play and resets the Mitsumi con-
				troller	board
	   CDIOCSETDEBUG	cause the kernel to print debug	messages to
				the console about the mcd driver
	   CDIOCCLRDEBUG	cause the kernel to quit printing debug	mes-
				sages about the	mcd driver

     The ioctl() commands defined above	are the	only ones that the mcd driver
     supports.	There are other	CD-ROM related ioctl() commands	(such as
     CDIOCSETVOL and CDIOCSETSTERIO) which are available and may be supported
     by	future versions	of the driver.

     /dev/(r)mcd0a  accesses BSD partition on the disc.	 Normally, there is
		    only one file system on a CD-ROM disc.
     /dev/(r)mcd0c  accesses raw device.

     The character-mode	devices	for the	mcd driver should only be used for
     accessing the audio features of the CD-ROM	player as the performance on
     data is abysmal.

     The current version of the	driver uses neither the	DMA or IRQ features of
     the interface board, although it has an interrupt handler for any IRQ
     requests that are generated.  Until the DMA features are supported, the
     only interrupts that the board generates are those	that are not supported
     by	the driver anyway.


     An	mcd driver appeared in FreeBSD 1.0.

     The driver	was written by Holger Veit (data part) and Brian Moore (audio
     part).  Changes were provided by Gary Clark II, Andrew A. Chernov,	and
     Jordan K. Hubbard.

FreeBSD	11.0		       December	8, 1994			  FreeBSD 11.0


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