Emax

--- In emax@yahoogroups.com, "bty54193247" <goodrobot@...> wrote:
>if the mother board works then its just a power supply issue this
should cost you max £80 parts and labour

 jammie
> 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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