Archive of the former Yahoo!Groups mailing list: The Yamaha AN1x Synthesizer mailing list

Jeff a écrit :

> Jerome St-Pierre a écrit :
>> Never mind. I searched some more and other users said we must make a
>> backup
>> before changing the battery.
> YES, unless you don't mind to loose all the patches stored in your
> keyboard (i.e : you have them on your computer as .an or .mid files...)
>> But I still have another stupid question. I don't understand how
>> removing
>> the battery could affect the patches? Aren't they saved on some kind
>> of hard
>> drive? Or are they really kept loaded in memory with the battery?
> YES. These patches are stored in a static CMOS RAM (not a flash
> EEPROM...) which in "stand by mode" is supplied by the back up
> battery. The extremely low, but not null, supply current (a few nA) in
> this special mode allows years of storage without the help of the main
> P.S. But without any supply all is wiped out . When the AN1x was
> designed, flash EEPROMS vere too small and too slow, and a hard disk
> would be too huge and too expensive to store only a few tens of
> kbytes. An AN1x patch is not a sampled sound but only a few lines of
> data and instructions.
>> I have no clue since I never did anything like that...
>>
>> Thanks for your help!
> If you don't want for some reason of your own to make a memory backup
> on a computer you can try the "kamikaze way" : open your synth, turn
> on the main supply and then change your battery BUT take care of short
> circuits when you're doing that. The screwdrivers or pliers are
> obviously conductive, but the battery itself (even flat out..) too :
> don't touch anything else with any metal part. When the main supply is
> "on" the RAM is in "active mode" and does not need any other supply.
> Cheers.
> J.F.