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> From: sukhoy27@...In a very old instrument, dirty contacts can always be a problem. Glad you found it.
>
> thanks for help ! I Solved a strange problem :
> The sound when playing from bank A 1 to the last tone bank,
> step by step became zero sound.
> It were RAM .
> I remove and clean the socket ,and RAM pin then reinstall,
> and all is perfect.
> I want to ask : Please when I change into new EPROM rev 9 orIt doesn't matter whether you use two 16K EPROMs or four 8K EPROMs, as long as the jumpers are set correctly. If you already have four 8K EPROMs, you can continue to use them for a newer version, and leave the jumpers the way they are now.
> rev 11 must i Use only 2 EPROM and new 16K RAM, and then
> change the PIN/ Bridge nearest ?