Il giorno 01 mar 2017, alle ore 20:39, 'Paul D. DeRocco' pderocco@... [chromapolaris] <chromapolaris@yahoogroups.com> ha scritto:

> From: sukhoy27@...
> 
> 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.

In a very old instrument, dirty contacts can always be a problem. Glad you found it.

> I want to ask : Please when I change into new EPROM rev 9 or 
> rev 11 must i Use only 2 EPROM and new 16K RAM, and then 
> change the PIN/ Bridge nearest ?

It 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.

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Ciao, Paul D. DeRocco
Paul  mailto:pderocco@...