cat /proc/scsi/scsi will tell you if they appear on the SCSI BUS or not. as will cdrecord -scanbus. If they're on the SCSI BUS then your problem lies not with SCSI emulation but your /etc/fstab (as mentioned above) and likely some symlinks. Let's see what this gives you:

ls -al /dev/cdrom

ls -al /dev/cdrom1

and so on for any device listed in /etc/fstab. These are 'symlinks' and if you have those links they should look something like so:

Code:
$ ls -al /dev/cdrom
lrwxrwxrwx    1 root     root            9 Aug 22 19:29 /dev/cdrom -> /dev/scd0
scd0 is the device name "SCSI Drive 0". This naming convention makes it possible for applications to use the same name for a cdrom drive no matter where it is on your system. In other words you could effectively 'rename' and cdrom drive "/dev/cdrom". Rather than configure each application (cdplayer, cdburning app. etc) most Linux applications default to automatically try to use /dev/cdrom. Thus the need for symlinks. It also makes changing out a cdrom very easy. How? Just swap it- you already have the driver for it and it's in use so you needn't worry about finding/installing a new driver.