Marble Madness jumper settings?

ON my MM board there are 3 jumpers at OP1 OP2 and OP3 - can any one confirm the correct positioning as OP3 is set up differently to the other 2...

Thanks

Holding the cartridge so that "C43" and "C42" are not upside down, each of OP1/2/3 has jumpers in the top position. This would appear to indicate the "256" position.

... Altan
 
Thanks for the reply - weirdly though i had 2 showing 128 and one at 256 - changed them all to 256 and got a rom error, changed them all back to 128 and it works fine...

still not sure why this should be but i guess it was worth messing with!
 
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