Sonic Triple Trouble Master System Conversion

I don't know if this has been discussed before or if anyone else has attempted it but I've been looking into this project for some time now, but I am limited by my lack of coding skills.

http://disgruntleddesigner.com/chrisc/sega...ing/gg2sms.html

Ever since I read about this, I've thought that all the Game Gear exclusive sonic games should be converted to master system, but Triple Trouble interests me the most. I don't mind a bit of colour approximation if it means we can get the games in full screen. Even other game gear exclusives should get the conversion treatment, like Gunstar Heroes. After reading the info provided, I have the illusion of understanding, but I'm just too green to tackle it on my own.

This is what I've got so far:

The biggest hurdle I can see at the moment is modifying the palette fading routine. I've though about how this would be modified for the Master System format and I think it would go something like this:

Code (Text):

1. eg) Fade to Black
2. Start Loop
3. If byte >= 15, subtract 15
4. If byte >= 5, subtract 5
5. If byte <5, subtract 1
6. If byte = 0, stop loop

Now if someone could take the Game Gear rom, locate the palette fading routines and modify them to work with byte per colour palettes instead of word per colour palettes, we would be well under way to porting the game to the Master System. Even if we can just disable the routine to start with, and just flash the palettes up as is, it would be a start. Once this is done, it would be relatively easy to modify the palettes to the Master System format, and we might have a partially working conversion. Anyone up to the challenge?

 

From memory

Game Gear: 0000BBBB GGGGRRRR
Master System: 00BBGGRR

In binary, of course.

 

It partially works, at least in an emulator. I changed the palettes of the intro to sms format, but the fading routine screws them up. There will be other problems too, but sorting out the palettes will be one of the more significant hurdles.

 

Conceivably, once it's ported to master system, you could have a Phantasy Star I type conversion from Master System to Mega Drive if you really wanted, but I don't see the point in that. You should have a power base converter if you want to use it on real hardware, and if you're emulating you have no problems. It's all about being able to play the games at a proper aspect ratio on the tv.