How Do You Deal With"Collection" Games?

[Dybbles]

Never made a subroutine before.... How do you do it?

[Pyriel]

You basically hook into one of the game's subroutines by branching out to a subroutine you've stored in unused memory (a "code cave"). If you're going to hook into part of an emulator, you'll have to be very careful to restrict when your subroutine does its work. I think what Skiller was describing was essentially inserting code into the routine that loads the ROM data, so he could retrieve the pointer to it without hassle and store it in a stable location. Injecting something into the emulated load/store operations and getting it to only fire when desired would take a bit more doing.

[lee4]

Incorrect. 110% incorrect. The games were not emulated at all in that particular compilation. Are you sure you're not thinking of the Mega Collection for the XBOX, Gamecube, etc?

I do know what is Sonic Jam
http://www.gamefaqs.com/saturn/19869...ages/box-42935

In Sega Saturn RAM

Work RAM Low (0x02000000): holds current partial of ROM data and music files
Work RAM High (0x06000000): holds emulator, Sonic Jam interface and
game's RAM data which match perfectly with actual sega genesis RAM

Gameshark codes
http://gamehacking.org/?game=84379