Atari system 1 switch bank error

bonehead

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Aug 9, 2014
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britain, United Kingdom
Hi,
I have a marble madness game cart that shows the error switch bank error. The slapstick is confirmed working and both slapstick rom chips have been checked with name code and verified. I have also changed the slag chips with known workers from another cart.
Main pcb works with both Indiana jones and road blasters so I'm pretty sore that's fine.

A friend also brought his marble madness cart round tonight which is supposed to be a worker a few months ago and that also shows the same error!!

Any idea where I can look from here?

I really want to get this sorted for my meet next month.

Thanks
 
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