Emax

On the original Emax, calibrations are held in a 9306 EPROM )not the  
2732/ or 2764.

I cannot confirm of course where the SE bit is set. That is not  
discussed in the service manual.

Regards,
Ted


On Nov 28, 2008, at 2:32 AM, tu@... wrote:

It looks like some bits are set in the Emax II EEPROM by these install  
disks. When the Emax II
boots it appears to check the EEPROM and only allows the use of stereo  
sampling and >2MB of
RAM if it finds the appropriate codes. One of my Emax II samplers,  
with 8MB and stereo sampling,
sometimes fails to get the right codes on bootup and operates as a 2MB  
machine with mono
sampling. So it looks like directly modifying the EEPROM data could be  
another solution to allow
expansion of the memory.

I believe there is even a facility to reprogram the EEPROM from the  
diganostics menu #7 "Adjust
features". I have tried this out briefly but if anyone wants to do  
some OS (or firmware) hacking
then this would be a worthwhile place to expend your efforts. At some  
point I will try capturing the
signals going to the EEPROM with a logic analyzer to see what is being  
read.

 From my understanding, the EEPROM also stores the calibrations for  
the pitch wheel, mod wheel,
volume slider, data entry slider, foot pedal, footswitch polarity,  
boot drive, headroom and LCD
contrast. There was also a plan to add a user access PIN code but it  
appears that was never
implemented.

On the original Emax I gather the EEPROM stores the filter  
calibrations as well as the code allowing
access to the SE functions.

/Tristan

Thursday, November 27, 2008, 5:52:57 AM, you wrote:

 >
That would be quite easy. The buyer needs a (WinXP/Vista) PC with
internal floppy drive, because the disk copy can not be done on the
Emax itself.

The buyer should use Omniflop (http://www.omniflop.com) and install
the omniflop.sys driver before using the omniflop software. I
recommend to use the latest version (2.2A).

Then start OmniFlop,
- click NEXT,
- select "Read Disk" and click NEXT,
- select the drive (A, B, ...) and flag all items except "Use slow
step rate" and click NEXT,
- when Omniflop recognizes the possible disk formats, select
80*2*10*512 Emax (standard) (or ...Emax (DOS standard) in the
previous versions of OmniFlop)
- perhaps Omniflop will ask to get a free license key if this is the
first time you use an Emax disk. Just press "Get license online",
provide the required information on the webpage, and you'll
immediately receive a key in your e-mail box which has to be copied &
pasted into the field of the still open window of OmniFlop
- then the "disk read" process will start (provide a filename when
prompted) and an 800K image will be saved to your harddisk.

This is the image we're looking for !

Note: I received an official Emu 2MB memory expansion install disk
with one of my s/h Emax-II samplers, but I assume it has been used
before and moreover, the last sectors of the disk seem to be corrupt
so it's pretty unusable now...

///E-Synthesist

--- In emax@yahoogroups.com, "Ted Summers" <djtbs1@...> wrote:
 >
 > If someone on the group buys this and was going to duplicate the
disk, it
 > might be wise to post the instructions how to do the duplicating
prior to
 > them getting it. Maybe instructions and link to any programs needed.
 >
 > Regards,
 > Ted
 >
 >
 > [Non-text portions of this message have been removed]
 >






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