I recently acquired the parts to piece together a fairly old system. It took me a few hours today to clean the parts up and piece everything together, but I finally got the damned thing to boot up.

Question is, how do I enter into the BIOS of this machine ?
It is a true 386 / 80486, it has just over 15MB of 30 pin RAM. When I boot it up, it says AMI BIOS 1993 American Megatrends: Resident Diagnostics V1.11. I have also been able to find the BIOS update date as 12/15/93.

The obvious keys don't work, I have already tired F1-12, [tab], [delete], et cetera.

It boots into a stripped SCO Unix; stops at the [boot:] prompt.

It does not boot off of floppy or cd-rom drive first, if it even supports either.

Any help at all will be greatly appreciated; might not only be BIOS, any other advice on what to do will also be appreciated.