Emax

Hello Tristan,

Well, I tried the motherboard swap, and the Emax II rack motherboard does indeed work 
with the Emax II keyboard, but, for some reason the extra memory doesn't appear, which 
is quite odd.....I can't figure out why?
As a sub note. You mentioned that I might not be able to adjust the contrast after the 
transplant,  as the contrast on the rack is adjustable via a panel button on the rack. The 
strange thing is, I was able to adjust the contrast via the slider.
Just a thought, could there be a chip on one of the other two boards (output, front 
button/LCD) that would block the use of the additional memory on the transplanted 
motherboard?
I was really hopeful when I'd put everything back together again, and the keyboard fired 
up, but after checking the memory, I found that I only had an additional 1mb of memory, 
rather than the 7mb I had hoped for, but hey, at least I now know that the boards are 
interchangeable, which is good to know!!
Many thanks indeed again for all of your help and advice.


All the best

Dave



--- In emax@yahoogroups.com, "bty54193247" <goodrobot@...> wrote:
>
> Hello Tristan,
> 
> Many thanks indeed for your reply. I think the motherboard swap sounds like a very 
good 
> option.....I'm going to take the two units apart today, and see if I can create a working 
> 8mb keyboard!!
> I'll let you know how I get on.
> 
> All the best
> 
> Dave
> 
> 
> 
> 
> 
> --- In emax@yahoogroups.com, tu@ wrote:
> >
> > Hello Dave,
> > 
> > While you can physically install the daughter board in your Emax II keyboard, the 
> memory will not 
> > be recognised until the internal Emax II EEPROM is updated. But to do that you need 
to 
> run a 
> > memory install disk which will write some data into the EEPROM. These install disks 
are 
> > unfortunately rather rare. But its possible someone on the list may have one, or a 
copy 
> of the disk 
> > image to enable you to make your own. The only other alternatives are to use the 
adjust 
> features 
> > option in the diagnostics menu  to perform a manual install or to remove and hack 
the 
> EEPROM 
> > directly. I don't know what the manual install codes are, or what bits to hack on the 
> EEPROM, so 
> > these are probably not great options :P
> > 
> > BTW, the daughter board only has a maximum of 6MB of RAM installed. The Emax II 
> motherboard 
> > will have either 1MB or 2MB. It is possible to upgrade a 1MB motherboard to 2MB by 
> replacing the 
> > RAM chips with a higher capacity chip and changing some PALs. But I think even this 
> upgrade 
> > requires a change to the EEPROM, so you are stuck with the same problem... Actually, 
I 
> just did 
> > some checking and it seems the daughter board also requires different PALs to be 
> installed if it is 
> > used with an Emax II with 1MB base RAM compared compared to one with 2MB base 
> RAM. 
> > 
> > Something else you could consider is transplanting the motherboard from your Emax 
II 
> rack into 
> > the Emax II keyboard. Because the motherboard comes with the EEPROM, the 
keyboard 
> would 
> > then be able to use the daughter board and have 8MB of RAM. I believe the 
> motherboards are 
> > identical, but I cannot be sure. One small difference between the rack and the 
keyboard 
> is that the 
> > keyboard allows you to set the LCD contrast from the master menu whereas the rack 
> has a trim 
> > pot mounted on the front panel that must be manually adjusted. But it is possible this 
> difference is 
> > only to do with the front panel board and not the motherboard itself.
> > 
> > /Tristan  
> > 
> > Tuesday, December 30, 2008, 1:31:40 AM, you wrote:
> > 
> > >
> > Hello all,
> > 
> > Well, it looks as if my Emax II is beyond repair, (Output board, and power supply not 
> > working), but I'm getting it checked over anyway, just in case it can be repaired.
> > If I can't get it repaired, I have an option to improve my Emax II keyboard. My Emax II 
> rack 
> > was fitted with a daughter board, with 8MB of RAM, (7MB on daughter board, 1MB on 
> main 
> > board?). 
> > It would be great if I could install the daughter board in my Emax II keyboard, along 
> with the 
> > RAM......how would I go about doing this?
> > My Emax II keyboard has 1MB RAM, and has the stereo option.
> > And help with the above would be greatly appreciated.
> > 
> > All the best
> > 
> > Dave
> > 
> >  
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