[vcf-midatlantic] Mystery ROM from MITS 88-PMC ROM Board

Systems Glitch systems.glitch at gmail.com
Wed Jan 27 20:08:06 EST 2016

I've been going through a lot of my S-100 boards, doing cleaning and testing. Tonight I started on a MITS 88-PMC, which had a ROM in the last socket (locations 0xFF00 - 0xFFFF) with no label. It's not the MBL, DBL, or TURMON. Here's a hex dump from the Dajen SCI monitor:


It starts with LXI SP, 0xFF13 -- a ROM location. I've seen the trick used elsewhere, to reduce code size by using an in-ROM jump table. Anyone recognize the code?


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