Emax

OK-  It’s not a question, or a maybe…..you just CONFIRMED with your description that you have Scrambled Megs, because the 9306 IC24 lost all parameter data (ie- the calibration, memory size are all held in there.
If it was me, I would change out that 9306 so you know it’s a new IC which shouldn’t lose it’s programming.

There is some sort of checksum generated and written to the 9306 during the memory upgrade procedure.
If you read the Scrambled Megs procedure- you basically get a challenge code from your Emax2 which you then provided to E-Mu (now to EPR), and they give you the response code (kind of like the old copy protection on many video games back in the 80s - you had to have the manual or you couldn’t play the game as there were many challenge codes contained in the manual).

As far as EPR- they got the Scrambled Megs recovery system directly from E-mu to provide the service as E-mu didn’t want to do it anymore…besides that they are E-mu factory authorized repair.
But hey, do what you want.

-T


On Feb 7, 2016, at 9:44 AM, midipuppies@mac.com [emax] <emax@yahoogroups.com> wrote:

Never mind my question about the 8MB image, it is on here. One of these machines has the EEPROM socketed, so I was able to read/write to it.


I still can't get the machine to recognize 8MB. Looks like 4MB. Keep in mind that this is/was a factory 8MB stereo keyboard, so no PALs or RAM have been changed around. I still think there's more to it than that EEPROM. 

I don't think I want to chance the $60 or whatever it is at EPR.

So to sum up what I have tried here:

This particular 8MB Stereo Emax II one day displayed a "Warning Need To Recalibrate!" message. After that, the memory size error followed, and the rest is history.

I have now reprogrammed both EPROMS with known good images, checked all connections to daughter board etc, and most recently erased and re-imaged the EEPROM with the 8MB image from this group.

If I am missing something, please let me know. 





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