Emax

Hello Jammie,

I've decided to get the rack working. A guy I know in Southampton will rebuild the power 
supply for £35 - £40 + parts.
The other issue is the output board. I'm going to take it over to him next week to have a 
look at. As the output board was in perfect working order a couple of weeks ago, I'm 
hoping it is something simple, in which case it shouldn't cost much to repair.

In all honesty, I was hoping that I could just transfer the motherboard, and daughterboard 
into my Emax II keyboard, I would then fit a HD, and I would be a happy chappy. OK, the 
remaining Emax II rack parts would be surplus to requirement, but I know there would be 
plenty of parts that other board user would be able to make use of.

Many thanks again

All the best

Dave



--- In emax@yahoogroups.com, "jammie.emma" <jammie.emma@...> wrote:
>
> --- 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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