So the error message I'm getting on the installation screen is correct (it can't find the drivers), but the reason is because it can't see the floppy to look for them?

That can't be the whole story. The drivers for the SCSI card and CDROM are compiled into the Linux kernel that the install floppy is booting from.

It clearly does have the drivers for the SCSI card and CDROM, because it is recognising them correctly.

Try some other floppies and/or try writing them on a different machine. Failing that try the BIOS updates.
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