"MBI" (probably a different MBI) made a
supplement ROM that added
some printer configuration features, etc.
I think that there still is one in my 16K 5150
Other "non-standard" ROMs:
Todd Fischer? made a diagnostics ROM, to temporarily replace the BIOS ROM,
and communicate through the serial port!
Has either one of those been imaged and saved somewhere?
g.
--
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