Hi, I am having a problem getting an old 486 system to boot, It worked fine a few years ago, but now the CMOS battery is dead and it reports an CMOS checksum error in POST, the problem is that it is nearly impossible to replace the CMOS battery because it uses something called NVRAM that is a small black box instead of a lithium battery that is hard to find and expensive to replace. And the changes I make to the BIOS never gets saved, when the computer restarts it goes back to the default, and the major problem is that the defaults are set to not detect hard drives or CDROMs, and to detect 5.25 inch 360K floppy drives instead of 1.44 MB 3.5 inch and so it reports a floppy disk failure too.

Is there a workaround to this problem without replacing the NVRAM?