Yeah 6502 can certainly be ported, not real wise though. You'd be far better off ripping the method then porting 'particular routines'. Although since the source the missing now ?, I can't say for sure how possible a high percentage port would be (A 100% port to DBpro isn't viable IMHO).
The main issues are really what machine specific things are missing. In terms of hardware, like the system Memory Map, display/sprite/sound/input hardware & Rom kernel calls.. Most of which could found online i'm sure..
Kevin Picone
Play Basic - Visible Worlds - Kyruss II
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