When you take a dumped Sonic and Knuckles ROM and a dumped Sonic the Hedgehog 3 image and type the following:
If something exists, it will get back some kind of feedback. If it doesn't, it will get back all 1's or 0's because there are no banks and it considers them blank. (The output would more likly be floating high 's -- i.e. all 1's) Since there is cartridge in the add-on port, it runs the Sonic and Knuckles game. If it determines that add-on port is occupied, it will read the header of the cartridge. (Think of the head something like a file name: It's a means of identifing the cartridge if no label was present.)
If it is not Sonic the Hedgehog 2 or Sonic the Hedgehog 3, then it spits out the message Ya right. If it IS Sonic the Hedgehog 3 then it runs Sonic 3 program on the S&K cartridge. It uses the Sonic 3 cartridge for all its graphics and sounds, except for any new ones.
At this point, if it is not Sonic the Hedgehog 3, then it can only be Sonic the Hedgehog 2. So it runs the Sonic 2 program on the S&K cartrage. It uses the Sonic 2 cartridge for all its graphics and sounds, except for any new ones.
It doesn't work: What do I do?
From my tinkering around, Sonic 3 works fine with the S&K modifications, but you cannot save your game. Sonic 2 does not work at the moment. More likely, it is the emulator. Also, check to see if the header says Sonic the Hedgehog 2 or ...3. Those console game distributers like to change the Header with things like Sonic 2 for Console Zone or Sonic 2 supplied by ^BaTMaN^. Under my theory, this WILL cause problems. Find a program that lets you change headers of carts.
As for getting into the secret bonus level by using another cart other than Sonic 2 or 3, for the S&K cart:
No luck either.
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