I'm having a little trouble with my old, (yes, I know it's that old.

The floppy disk drive is damaged, and I have changed it.
Now the Resident Diagonistics Rev. 1.05 cannot find the drive, and says it's not present.
I have tried to enter the Bios, and my manual says that I should press: Ctrl, Alt and U, simultaneously, after the following message, "System Region ID......." has been displayed for 5 seconds.
This doesn't work, so I'm not sure what to do.
Does somebody remember how to enter the bios?
The computer is a: Olivetti M4 64 Modulo