grub> ls doesn't show CDROM device

[Robert]

v1.98

Hello, on a very old system I boot e.g. from floppy then want to 
load linux kernel&image from (normal internal IDE) CDROM, then 
mount a Firewire disk paritition as root.

(There seems to be no Firewire mod in Grub2? (and: the 
usbms,uhci,ohci mods also seem to not work correctly?))

Yet "ls" on the grub prompt only shows the (fd0) boot device and 
an internal harddisks, if existing.
The CDROM device is not visible.
The iso9660 module is loaded.
Which modules or ... do I need to see the CDROM from Grub2?

and optionally: how to see USB keys, when not supported by Bios. 
(tried  insmod's:  usb usbms uhci ohci )


PS: Yet if I boot e.g. from a super grub disk CD, I see the CDROM 
as (hd31) - and (fd0) also.  why not when booting from any other 
device?