so yeah, i had a look at the code, and to put it simply, i was expecting to see alot more *working* opcodes
i see now why you're focusing on that
but, i have the PS1 data, emulators and everything so i should be able to help you with that
just need to read up on how the PS1 works, and how to make my emulator spew out all the nitty gritty details
oh, and, i was toying around with the PC field background data, i managed to get nearly all of them to look perfect (minus special effects, since "we", the wiki and i, have no idea how that works)
there's one thing thats bugging me though, some (most, but not all) of them expect black (0x0000, after palette filtering) to be replaced with color 0 in the palette, and there doesn't seem to be any sort of flag or anything to indicate if this behavior is required
following that rule makes some backgrounds look good, but draws non-black pixels that should be black in others, not doing it breaks the ones that expect this but make the others look fine
i think i'll leave it at that and wait 'til some smart kid figures it all out