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[GregadetH]

I picked up a boxed 7800 on a trade and it won't play ANY of my 2600 games. Not one single game. I just get a black screen. Oddly enough, 7800 carts play just fine on it. Anybody have an idea of what could be wrong? I'd hate to have to ship it back as it's a beautiful console & it came with some great boxed games.

[AtariLeaf]

If it plays 7800 games fine but not 2600 games its probably the whatchamacallit chip (Maria? Stella? Gertrude?)