Do you have just the first two ROMs in your unit or all three? The third ROM came with the unit, but could be removed. It added a lot of extra functions to the core monitor. The original system also came with a couple of ROMs of sample software.
The actual manual was mostly uP basics, only a little of it covered use of the system. I may still have one, but I doubt it. There's a good chance I still have a copy of the monitor source, though. I tend to hang on to any source I get. I'll see if I can turn it up.
The PCB inside the Prompt 80/85 is a standard SBC 80/10 board, BTW. If I still have the monitor source, there's a good chance I've got the schematic, too.
Operation from just the core monitor is almost identical to an SDK-85. With the extended monitor, it acts like an SDK-85 with a TTY, plus a hex calculator, byte search, etc.
From memory, the F functions were, from 0 to 7:
read tape,
write tape,
program prom,
compare prom to ram,
dump prom to ram,
xfer block,
hex calc,
byte search,
word search.
F Functions 8, 9, and A were for the 8755 adapter: program, compare, dump to RAM
The base unit takes 8708 EPROMS, I don't think it did 8758s (IIRC, I did those with an adapter.)
I'll see what I have, and copy anything that interests you.
