>>> I've been trying to figure out how to get a Pioneer DRM-610 to work
>>> under NetBSD/i386.  It's an old SCSI1 CD player, with a magazine that
>>> holds 6 disks, and hardware that can load one of them at a time into
>>> the player proper. It presents itself (probably erroneously) as having
>>> a full complement of 8 LUNs, but whichever of them I mount, I get the
>>> CD from the first slot of the magazine.
>> 
>> I suspect this might be a buglet in the CD-ROM.  Many seem to report
>> multiple LUNs when they really are only at one.
>> 
>> Do you have the "ch" driver in your kernel?  I would think that the
>> changer would use that, but I've been wrong many times before.  :)
> 
> Hmm.  Quite some time ago we had such a drive here.  If I remember correctly,
> the selection of the CDs from the various slots was indeed done via the LUN.

[Catching up on e-mail ... ]

For what it's worth, I have a Pioneer DRM-640 (I *think* it's a 640 ... )
installed on a NetBSD 1.2_BETA Pentium 120 PC equipped with an Adaptec 2940.
It also has the 6 CD magazine, and it shows up as a DRM-600:

NetBSD 1.2_BETA (SCIPIO) #0: Fri Jul 19 05:59:30 PDT 1996
    root@scipio.jpl.nasa.gov:/usr/src/sys/arch/i386/compile/SCIPIO
CPU: Pentium (GenuineIntel 586-class CPU)
[...]
ahc0 at pci0 dev 5 function 0
[...]
ahc0: aic7870 Single Channel, SCSI Id=7, 16 SCBs
[...]
scsibus0 at ahc0
[...]
ahc0: target 6 synchronous at 5.0MHz, offset = 0xf
cd0 at scsibus0 targ 6 lun 0: <PIONEER, CD-ROM DRM-600, 2403> SCSI1 5/cdrom 
remo
vable
cd1 at scsibus0 targ 6 lun 1: <PIONEER, CD-ROM DRM-600, 2403> SCSI1 5/cdrom 
remo
vable
cd2 at scsibus0 targ 6 lun 2: <PIONEER, CD-ROM DRM-600, 2403> SCSI1 5/cdrom 
remo
vable
cd3 at scsibus0 targ 6 lun 3: <PIONEER, CD-ROM DRM-600, 2403> SCSI1 5/cdrom 
remo
vable
cd4 at scsibus0 targ 6 lun 4: <PIONEER, CD-ROM DRM-600, 2403> SCSI1 5/cdrom 
remo
vable
cd5 at scsibus0 targ 6 lun 5: <PIONEER, CD-ROM DRM-600, 2403> SCSI1 5/cdrom 
remo
vable

... and it works as advertised: there are three CD-ROMs in it right now, and
I can mount them (from /dev/cd0a, /dev/cd1a, and /dev/cd2a respectively), and
it works just great!  Czech it out:

scipio# mount -vrt cd9660 /dev/cd0a /mnt ; ls /mnt ; umount /mnt
/dev/cd0a on /mnt type cd9660 (local, read-only)
aareadme.txt*   document/       neptune/        voldesc.sfd*
browse/         index/          other/          vtoc.sys*
calib/          label/          software/

scipio# mount -vrt cd9660 /dev/cd1a /mnt ; ls /mnt ; umount /mnt
/dev/cd1a on /mnt type cd9660 (local, read-only)
cc402hp7.tar*   cx202sol.tar*   oc202sol.tar*   tc101sun.tar*   vc250sun.tar*
cc402sol.tar*   cx202sun.tar*   oc202sun.tar*   vc250hp7.tar*   x11r5src.tar*
cc402sun.tar*   oc202hp7.tar*   read.me*        vc250sol.tar*

scipio# mount -vrt cd9660 /dev/cd2a /mnt ; ls /mnt ; umount /mnt
/dev/cd2a on /mnt type cd9660 (local, read-only)
aareadme.txt*   mg15sxxx/       mg45nxxx/       mi20nxxx/       mi45sxxx/
document/       mg20nxxx/       mg45sxxx/       mi20sxxx/       mi50nxxx/
gazetter/       mg20sxxx/       mg50nxxx/       mi25nxxx/       mi50sxxx/
index/          mg25nxxx/       mg50sxxx/       mi25sxxx/       scxxxxxx/
label/          mg25sxxx/       mi00nxxx/       mi30nxxx/       sexxxxxx/
mg00nxxx/       mg30nxxx/       mi05nxxx/       mi30sxxx/       software/
mg05nxxx/       mg30sxxx/       mi05sxxx/       mi35nxxx/       voldesc.sfd*
mg05sxxx/       mg35nxxx/       mi10nxxx/       mi35sxxx/
mg10nxxx/       mg35sxxx/       mi10sxxx/       mi40nxxx/
mg10sxxx/       mg40nxxx/       mi15nxxx/       mi40sxxx/
mg15nxxx/       mg40sxxx/       mi15sxxx/       mi45nxxx/

Admittedly this is a month-and-a-half old current, but ...

(I have the "ch" driver in my kernel config file, and I have a "/dev/ch0"
 character device file, but how does one use it?  Jason?)

	- Greg