thegoldenband, on Thu Nov 4, 2010 5:48 PM, said:
tz101, on Thu Nov 4, 2010 5:15 PM, said:
It is due to TMSS on the model 2.
Yes, as with the others mentioned, but there's something extra going on with Budokan since it refuses to work even with a Game Genie. In the discussion at Sega-16, Eke-Eke mentioned that there were two phases to the lockout: having the "SEGA" string in the header, and writing "SEGA" to the TMSS register before accessing the VDP. The Russian and Chinese pirate carts that fail completely on TMSS systems, even with a Game Genie attached, are apparently overwriting or clearing that register after the GG sets it for them. Maybe Budokan is doing the same thing.
It's possible. As you indicate, it's not quite so simple as one would think. It could be something weird that has little or nothing to do with TMSS. You have to remember that those first three EA titles were released as fully licensed games, but were actually developed before EA had a licensing agreement with Sega (using the same reverse-engineering techniques that Accolade had used to develop Ishido
). Although from what I've read, there seems to be at least some copies of the game that will work on later TMSS consoles. So apparently whatever the problem was, it seems that it was eventually corrected. I don't have a Genesis 2 (or most of these games) but I'll have to look into this further, as now I'm curious.
tz101, on Thu Nov 4, 2010 5:58 PM, said:
This is educational. I was not aware that the early EA and Accolade carts would work with a TMSS system, even with Game Genie. So Game Genie trumps TMSS for those games?
It should in theory, but as I alluded to above, there are multiple variables in play here, some having nothing to do with TMSS.
In addition to the titles in question being developed in an 'unlicensed' setting using reverse-engineering with no dev kit, the situation is further complicated by all the board revisions that the Genesis console had. It may be certain board revisions that are having problems. (At least some of these board revisions were likely attempts by Sega to lockout devices like the Game Genie itself, as well as unlicensed game titles, so that may be in play here as well in some cases.)