Emax

I guess the first stage of testing would be if I could transplant my known working 8Meg exp board into one of my other Emaxes and then replace the EPROM and see if it sees all 8meg.
Once we know the prom works, then work on populating a 4meg board and go from there

I'm away from Sunday until 16th but then I'll dive in to my Turbo Emax and take pictures.
Do you have the EPROM image Richard?..


Simon


--- In emax@yahoogroups.com, Rish <rish@...> wrote:
>
> I have the EPROM burner and will burn EPROMs for this project for free until we figure it out and after that I would charge a small fee.
> 
> Also it is my experience that not all chips that EMU said were PALS actually are really PALs. They did this to protect their proprietary hardware, this was a common practice with EMU and many others.
> 
> Richard 
> 
> Sent from my iPod
> 
> On Nov 26, 2010, at 9:03 AM, "Simon" <chevytravelleruk@...> wrote:
> 
> > 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]
> > >
> > 
> > 
> 
> 
> [Non-text portions of this message have been removed]
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