REV02 might be wrong about s2disasm

[Clownacy]

Alright, REV02 is definitely wrong. The problem with KiS2 and Sonic Compilation is that neither of them have REV02's original header.

The Mega Play version does.

And yes, it lacks Compilation's bugs. The title screen was updated, changing the copyright year to 1993, putting this build a year before KiS2, two years before Compilation, and four years before Sonic Jam.

SEGA GENESIS    
(C)SEGA 1992.SEP
SONIC THE       
      HEDGEHOG 2
                
SONIC THE       
      HEDGEHOG 2
                
GM 00001051-02Œ>
J               
......ÿÿ.ÿ...ÿÿÿ
                
                
                
                




JUE             

You have no clue how long I've wanted to see this :l

Thanks to this ROM, I now know that REV02 didn't remove the nops in ErrorTrap. That was just another change Compilation made.

[flamewing]

Nice finds. Eagerly awaiting the "true" rev02 commits!

[Clownacy]

I've pushed my S2 Mega Play disassembly to the megaplay branch. Unfortunately, there's one discrepency: while the Compilation bugs aren't there, the edited HPZ/OOZ animated art tables are. I'll have to double-check if they really are absent from KiS2, and what they do in the first place.

[Clownacy]

Welp, I'm dumb. KiS2 has the animated-level-art edits as well. Also, I figured out what the changes are for:

; In REV02, for some reason these blank tiles' palette line was changed to lines 3 and 4.
; This is consistent with MTZ's blank tiles.
; Notably, the new palette lines' first entry always happens to match the current VDP background colour.

[Clownacy]

So now the Compilation bugs have been stripped from the main branch. Unfortunately, we'll probably never have a real bit-perfect REV02 ROM, since the JmpTos are massively different, even between Sonic Classics and S2 Mega Play. Still, this should be functionally perfect now, at least.