I did some testing and it seems to work just fine.
My guess is that you probably tried to link on both consoles at the exact same time. This will not work. There needs to be some time between when the first console tries to link and the second, usually a couple of frames.
This is because the first console to try linking will become the master time keeper. The second console will then be slaved to it, and will only send and receive data when triggered by the master console. When you try to link at exactly the same time, both consoles try to be the master time keeper, and cannot sync properly.
Ah, thank you. The link buttons are working in the console window, but the games are responding as if they aren't linked. Here's a savestate of three Pokemon Yellow games prepared to trade, which aren't successfully linking. I appreciate that you're setting up this feature that may only be useful for one TAS. Hopefully I can get it working.
Cable connect status:
LC: False
CR: False
RL: TrueAlright, thanks. Any suggestions on how to debug gameboy color games, outside simulating the z80 entirely?
Is it possible to record a TAS of three Gameboy Color games, with no more than two games linked at any one time? Either directly with the multi-disk bundler, or by somehow using a lot of movies that start from savestates in order to switch connected games.
An important part to note for this run is the fact that it executes controller registers while they are being updated. This is known to not be emulated in a correct way on emulator. This gives this run a high chance of not working on console at all. However, leading the game code to the controller registers is done perfectly fine, so while these exact input sequences probably won't work on console, it's likely there are indeed some inputs which work. The run wouldn't look very different, so we can safely say that this isn't a problem.
Around a month before this was submitted, Total and I worked on the Super Mario Bros. 2 (SMB2USA) game end glitch. It also takes advantage of the DPCM glitch, but the difference is that a memory setup needs to be achieved in the first level before taking advantage of the glitch. For anyone curious, the documentation can be read here to see how it compares to this SMB3 submission.
6 sided dice roll generator
I found a 3 frame time save in the warpless run in 4-2.
If you run a bit before pressing down for the super jump, the sliding momentum moves you quite a bit further while building up the jump power. The picture above is the frame I press down.
Unfortunately fry guy desyncs due to ??? so it still needs work.