Old bios definitions for CD

I am helping a friend with an old Micron computer.  It has a Micronics M54HI motherboard with a TEAC 56E cdrom.   The system would not boot from a floppy, so I went to bios setup.  Someone had put a password on the bios setup program, so I jumpered it to reset.  Big mistake.  This board is so old, it does not recognize the cdrom.  So, I need to  define the CDROM  as a User hard disk.  I have been "googling" for hours and have been unable to find the geometry of a CDROM.  Does anyone have a suggestion?

And, all I really wanted to do was fix TCPIP on win98.

Rick