Emax

Wow.. interesting and informative Ted.. I have an 8Mb Emax and a couple of 4 meg machines.. I'd be quite interested in trying them to see if that trick could work. Is there any particular EPROM reader/writer you'd recommend for this or is one much the same as another?..
Also.. would there be any way of duplicating/imaging the install discs, assuming we could find one


Simon


--- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:
>
> That is if you have 1MB RAM- if you have 2MB it may be possible to update it
> someway.
> Although my efforts were not successful.
> 
> I had 2 units- 1 with 1MB and one that is an 8MB.
> Taking the 8MB board, I was not able to take an copy of the 8MB EPROM and
> the board and just move it over.
> It didn't work.
> 
> Regards,
> Ted
> 
> 
> On Wed, Nov 24, 2010 at 8:07 AM, Ted Summers <djtbs1@...> wrote:
> 
> > The issue isn't the circuit- schematics are available.
> > The issue is that:
> > 1) The upgrade disks are not available.
> > 2) The upgrade requires registered PALs.
> >
> > So- for number #1 it may be possible to write  / copy an eeprom to update
> > your memory.
> > Someone on the group says they did it, but I could not replicate their
> > effort.
> >
> > 2) You cannot read registered PALs.
> > So if you don't have the original binary (we don't), then you can't make
> > duplicates of them.
> >
> > Currently there is only 1 way to break a registered PAL- reverse engineer
> > it using an high power (electron?) microscope to see each switch gate and
> > map it out.
> > The cost to have someone do that is very prohibitive, and may even be
> > illegal in some countries.
> >
> > There is a team / person I have contacted that is working on a piece of
> > equipment to read / determine registered PAL programming, but he is sometime
> > away from a usable prototype for Registered PALs. The equipment is likely to
> > cost about $300 when it becomes available..
> >
> > That is as much as getting a working Emax2 with memory off ebay....
> >
> > Regards,
> > Ted
> >
> >
> >
> >
> >
> >
> >
> > On Wed, Nov 24, 2010 at 4:14 AM, Niklas N <niklas627@...> wrote:
> >
> >>
> >>
> >>
> >> Have a few questions about memory for Emax 2
> >>
> >> - Does anyone know where I can get memory to Emax 2?
> >> - Is there anyone who has tried to "build" memories or have a schematic
> >> sketch of the memory? The circuit is quite big, so it should not be
> >> difficult to build if you have knowledge of how to build a circuits.
> >> Maybe someone can post a picture of how the circuit looks like and what
> >> components are on it? Maybe can I make a sketch from some pictures.
> >> - Is upgrade disks to memory to obtain or can someone post this on
> >> formumet so you can download it in the EMX format?
> >>
> >> cheers
> >> niklas
> >> www.myspace.com/non73audio <http://www.myspace.com/non73audio>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>  
> >>
> >
> >
> 
> 
> [Non-text portions of this message have been removed]
>