Help fixing Vector-06c

[KTSerg]

... Is there a reason to load multiple BIOSes? Or do you put something else in the extra ROM space?

A lot of bootloader programs:
http://sensi.org/scalar/categories/42/

A universal boot, which is quite enough for most users:
http://sensi.org/scalar/ware/540/

I have several options written in my ROM, but I haven’t switched for many years and I don’t even remember which options you can choose.

Some users have installed a program with additional features in the ROM:
http://sensi.org/scalar/ware/541/
The instructions for revision are there.