See? I told you that you had an MFM drive. :wink:
If you must use the MFM and an IDE CDROM drive together and you have a 2-port IDE controller and it allows you to disable the primary port, you can hook your IDE drive to the secondary port.
Or... if you have single-channel controller with configurable I/O and IRQ settings, set the I/O port to 17x (hex) and the IRQ to 15 and give it a shot.
But honestly, I wouldn't bother trying to set up a secondary IDE controller--it's a crap shoot at best and fruitless agony at worst, Just get an IDE drive, get an IDE/floppy controller and set up your hard disk as an IDE with an IDE CD-ROM.
Alternatively, get a SCSI controller and a SCSI CD-ROM. They'll pretty much work with any other drive combination. But they're not as easy to come by as the IDE versions. But you could get lucky.