Hi Steve, Well first of all, it's awesome you've got a renewed interest in this little project!
One resource you might also find helpful is the ModelT Memory Map Database: https://www.web8201.net/default.asp?content=modelt_memorymaps/mapview.asp I'm also willing to assist with the conversions on those addresses. I'll take a first stab and finding the equivalents for the NEC on your list. Gary On Sat, Feb 18, 2023 at 1:49 PM Kenneth Pettit <petti...@gmail.com> wrote: > Hey Steve, > > Looks like the NEC and M100 math routines are a fair amount different. > > I have started a task of annotating the NEC VirtualT disassembly listing > with the hand-coded changes I made to the M100 disassembly. We'll see how > far I get along this path (There are a LOT of additions I made by hand). > > Ken > > On 2/18/23 12:07 PM, Stephen Adolph wrote: > > 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 <twospru...@gmail.com> > 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 >> >> >> >> >
