The 5150, as released in August 1981, had SIX ROM
sockets. It had one
8K
ROM for the BIOS, four 8K ROMs totaling 32K for BASIC, and one empty
socket, which usually stayed empty. A company calling itself MBI sold
an
accessory ROM for that socket thatr added some trivial features.
I always wondered if anyone made use of the extra BIOS sockets. Do you by any chance
recall what functions were added?
-Ali