[atari7800] 7800 cartridge detection

Hi !

I am having trouble with a 7800. How does the 7800 detect that a cartridge
is plugged into its cartridge port ? It starts up the built in Asteroids for 
some of
the cartridges I have here, even if they are plugged in ...

Is the 7800 faulty or the cartridges, or is this a common problem ?

Armin

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