For Sale: HP-71B MultiMod ROM Emulator

[mfleming]

Good question. Basically bit 0 of the value you poke indicates the ROMs in the 7 16K "chips" should be enumerated when queried by the O/S. When I added the so-called hidden ROM I used bit 1 to indicate that it should also be enumerated as well (if present). So, poke "1" you get Forth, Math, and JPC. Poke a "3" and you get ULIB as well. The value "2" is undefined. I thought it might be useful to enable the hidden ROM separately from the main ones.

You can flip the hidden ROM in or out of the address space as needed. One reason might be to bring in a set of LEX files, copy a few to RAM then switch the set back out again. My original thought was to provide drivers for the serial port sometime in the future. I'd be delighted to see if someone comes up with something more clever!

~Mark