I'm using the m100 an especially the nec roms as a cross reference for my MSX disassembly. They are so close and in many cases it is of great help in identifying the constant values and the dynamic data, vectors, etc. In this way I'm now able to change the MSX and, still with some limit, the m100 ROMs. I'd like to waste some more time and extract a generic portable BASIC from those sources, e.g. to see it run on, say, a zx spectrum, but moving it all in a 16k rom is probably VERY challenging. The similarities with the MSX are interesting, the nec has almost the same tokenization mechanism, but a different (older) floating point implementation, all the other models have the same FP engine (double precision, BCD encoding) but a different (older) way to deal with tokens. I suppose it was done to fit the code in the available space in ROM.
