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This is the way to emulate ide-cdrom to scsi-cdrom

 Turbolinux Workstation 7.0 (Monza)
 Linux 2.4.18-8 on an i686 (kitora)
 Tue Mar 11 2003

# insmod ide-scsi
Using /lib/modules/2.4.18-8/kernel/drivers/scsi/ide-scsi.o

# mount /mnt/cdrom
mount: wrong fs type, bad option, bad superblock on /dev/hdc,
       or too many mounted file systems.
       (could this be the IDE device where you in fact use
       ide-scsi so that sr0 or sda or so is needed?)
# mount -t iso9660 -r /dev/sr0 /mnt/cdrom
# ls /mnt/cdrom
# umount /mnt/cdrom

# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATAPI-CD Model: ROM DRIVE-40MAX  Rev: 40BT
  Type:   CD-ROM                           ANSI SCSI revision: 02

# ln -sf /dev/sr0 /dev/cdrom

[/etc/modules.conf]
-------------------------
alias scsi_hostadapter ide-scsi
-------------------------

[/boot/grub/menu.lst]
-------------------------
# Entry 3:
title  Turbolinux WorkStation 7.0
root   (hd0,8)
kernel /boot/vmlinuz root=/dev/hda9 hdc=ide-scsi
-------------------------

# /sbin/shutdown -r now

And You make sure whether CDROM is recognized as SCSI again.