>> Some games do not support cocktail mode (and thus are flagged NO_COCKTAIL)
> I don't think that games that games that don't support this mode in the first place are flagged as NO_COCKTAIL.
You're right : when a game does NOT support cocktail mode while the hardware is supposed to do so (eg: some bootlegs on Galaxian hardware), there is a note in the driver, but no flag ...
> There must be something with cocktail mode that makes is specially hard or strange and thus not emulated in many cases, that's what I was curious about...
Beside RB's answer (screen flipping can be hard to emulate), another reason why games have this flag is because inputs are NOT mapped for player 2 ... Most of the time, the inputs are multiplexed on the same adress(es), and you need to add PORT_CUSTOM and some other tricky things to simulate what is done by the hardware ...
 Steph from The Ultimate Patchers 
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Re: why so many "Screen flipping in cocktail mode is not supported"?
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