Reviving this thread. SuperROM uses RST1 to make "trampoline" calls to the main ROM. I've gone through all of the RST1 calls that SuperROM makes to the M100 main rom. Most convert well.
The really big gap is that the math routines are very different in PC-8201. If there is anyone motivated to help, It would be helpful to figure out the equivalent calls PC-8201 calls for this list of M100 main ROM calls. 0x30C2 0x31B5 0x31B8 0x31BB 0x31C1 0x31C4 0x31CA 0x31CD 0x3469 0x3472 0x34D2 0x3501 0x3510 0x3513 0x35BA 0x35CF Ideally requiring no major code rework on SuperROM to make it all work. On Mon, Jul 12, 2021 at 8:30 AM Stephen Adolph <[email protected]> wrote: > Noting that SuperROM has never been found (or never released?) for NEC, it > seems to me given what I know about making applications run on both > platforms, that it should be very straightforward to translate the M100 > SuperROM into an NEC variant. After all, the NEC and M100 are so similar. > > Does anyone have any thoughts on this? > > Process could be: > - Disassemble > - find the trampoline, and adjust for NEC memory map > - look for "trampoline" calls to the main ROM, and convert to NEC addresses > - look for upper RAM addresses, and convert to NEC addresses > ---> this could be a bit tricky I admit, because it may not always be > apparent that a register pair value is being used as an upper RAM pointer > - adjust the hardware interrupt if needed > > > cheers > Steve > > > >
