Let's Get Technical > Schematics & Modifications (mods)

Batteryless EEPROM mod

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peoriashows:
Sorry if this has been discussed before, but this guy's shows a batteryless EEPROM mod he did. Seems a bit more sophisticated than I want to get into, but I thought it was worth sharing.

www.stagecue.com/ada.html

Griphook:
Hey peoria,
This looks exactly the same: http://adadepot.com/index.php?topic=1464.msg13968#msg13968 and MJMP stated some concerns with this mod.
There is even an instruction, how to do it  ;)
greetsGriphook

peoriashows:

--- Quote from: Griphook on August 07, 2018, 11:45:42 AM ---Hey peoria,
This looks exactly the same: http://adadepot.com/index.php?topic=1464.msg13968#msg13968 and MJMP stated some concerns with this mod.
There is even an instruction, how to do it  ;)
greetsGriphook

--- End quote ---

Good catch.  Thanks. Marshal made a good point about not being able to reset it if the memory gets corrupted,  but otherwise sounds interesting,  though nothing I feel like getting into. I just replaced the original battery in my MB-1, so I'm not too concerned with having a battery in there. They last for a long time.

Griphook:
Yep. Same over here.

At least its nice to see, that other People are trying to keepall this ADA Stuff alive, although I think, everyone, who buys an old ADA-Unit should know about this board and all the beatiful people around here  :thumb-up: ::)

MarshallJMP:
Also some MP-1's don't like this mod. I had one in repair a few months ago that did some strange things and it had this mod. I ended up replacing it with the original RAM chip and battery and it functioned fine again. This was also discussed on the old forum, some people had trouble with NVRam and with some it worked fine.
I think it's a timing issue, it takes times before the flash memory is written into the Sram of the NV chip at startup. If that time is longer then the reset circuit time then you could get problems. (I guess).

Now it's easy and cheap to put in a battery holder, much cheaper then this mod and you're sure you won't run into problems. And if you make a backup of your presets on your pc and the battery  goes dead, replace the battery, put the presets back in (take only a minute ) and you're good to go.

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