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     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 FX001D.

     The mcd driver responds to disk-specific ioctl() commands, namely the DIOCGDINFO, DIOCGPART,
     DIOCWDINFO, and DIOCSDINFO, commands.  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 controller board
           CDIOCSETDEBUG        cause the kernel to print debug messages to the console about the
                                mcd driver
           CDIOCCLRDEBUG        cause the kernel to quit printing debug messages about the mcd

     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.