This is a first attempt to create an `improved' driver for the Mitsumi drives.
It is able to "live together" with mcd.c, if you have at least two Mitsumi
drives: each driver can use his own drive.

To allow this "coexistence" as long as mcdx.c is not a superset of mcd.c,
this driver has to use its own device files. We use MAJOR 20 for it. So,
you have to do
 # mknod /dev/mcdx0 b 20 0
 # mknod /dev/mcdx1 b 20 1
and so on, one entry for each drive to support, once.

If you are using the driver as a module, you can specify your ports and IRQs
like
 # insmod mcdx.o mcdx=0x300,11,0x304,5
and so on ("address,IRQ" pairs).
This will override the configuration in mcdx.h.

This driver:

	o	handles XA (and hopefully) multi session CDs as well as
		ordinary CDs;
	o	supports up to 5 drives (of course, you'll need free 
		IRQs, i/o ports and slots);
	o	uses much less kernel memory than the standard mcd driver
		(no extra driver internal buffers!).

This version doesn't support yet:

	o	audio functions;
	o	shared IRQs (but it seems to be possible - I've successfully
                connected two drives to the same irq.  So it's `only' a 
                problem of the driver.)

This driver never will:

	o	Read digital audio (i.e. copy directly), due to missing
		hardware features. 
