Re[2]: [emax] Re: 2MB memory board upgrade on eBay
2008-11-29 by tu@...
The 9306 is actually an EEPROM, a 2732 or 2764 is an EPROM. I was referring to the SE bit (or bits) being set in the 9306 EEPROM in this case. /Tristan Friday, November 28, 2008, 11:27:42 PM, you wrote: > 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
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> them getting it. Maybe instructions and link to any programs needed. > > Regards, > Ted > > > [Non-text portions of this message have been removed] >