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Thread

Emax 2 memory

2010-11-24 by Niklas N

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]

Re: [emax] Emax 2 memory

2010-11-24 by Louis van Dompselaar

The memory itself is not difficult (just a bunch of DRAM chips, even though they will difficult to obtain).

The problem will lie in the PAL chips needed to control them.   My guess is only EMU has the code to those ones.


Op 24 nov 2010, om 13:14 heeft Niklas N het volgende geschreven:

> 
> 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
> 
> .
> 
>  
> 



[Non-text portions of this message have been removed]

Re: [emax] Emax 2 memory

2010-11-24 by tu@...

I believe Rob at the Emulator archive has the code for the PALs. It would certainly be possible to 
clone the Emax II memory expansion board, but given the time and cost involved it would be 
cheaper just to buy another Emax II with the board already installed.

/Tristan

Show quoted textHide quoted text

On Wed, Nov 24th, 2010 at 11:18 PM, Louis van Dompselaar <louis@...> wrote:

> The memory itself is not difficult (just a bunch of DRAM chips, even
> though they will difficult to obtain).
> 
> The problem will lie in the PAL chips needed to control them.   My guess
> is only EMU has the code to those ones.
> 
> 
> Op 24 nov 2010, om 13:14 heeft Niklas N het volgende geschreven:
> 
> > 
> > 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
> > 
> > .
> > 
> >  
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
>

Re: [emax] Emax 2 memory

2010-11-24 by Louis van Dompselaar

Agreed.  For the price of manufacturing that double sided PCB alone you would buy a fully expanded Emax II.
IF you can even find enough DRAM chips and a PAL writer.


As we are on the subject of memory; do I understand the memory expansion document correct if I assume that if I have a 2MB machine with a 2MB expansion board, that can be expanded to 8MB without needing new PALs?  I.e. it would only require DRAMs and the install floppy?



Op 24 nov 2010, om 14:01 heeft tu@... het volgende geschreven:

> I believe Rob at the Emulator archive has the code for the PALs. It would certainly be possible to 
> clone the Emax II memory expansion board, but given the time and cost involved it would be 
> cheaper just to buy another Emax II with the board already installed.
> 
> /Tristan
> .
> 
>  
> 


[Non-text portions of this message have been removed]

Re: [emax] Emax 2 memory

2010-11-24 by tu@...

The 2MB memory expansion kits included both DRAMs and PALs, so I expect most expansion boards 
would not have the PALs already installed unless they have all the DRAM sockets filled. But it is 
possible some may. It is easy enough to check.

/Tristan

Show quoted textHide quoted text

On Thu, Nov 25th, 2010 at 12:06 AM, Louis van Dompselaar <louis@...> wrote:

> Agreed.  For the price of manufacturing that double sided PCB alone you
> would buy a fully expanded Emax II.
> IF you can even find enough DRAM chips and a PAL writer.
> 
> 
> As we are on the subject of memory; do I understand the memory expansion
> document correct if I assume that if I have a 2MB machine with a 2MB
> expansion board, that can be expanded to 8MB without needing new PALs? 
> I.e. it would only require DRAMs and the install floppy?
> 
> 
> 
> Op 24 nov 2010, om 14:01 heeft tu@... het volgende
> geschreven:
> 
> > I believe Rob at the Emulator archive has the code for the PALs. It
> would certainly be possible to 
> > clone the Emax II memory expansion board, but given the time and cost
> involved it would be 
> > cheaper just to buy another Emax II with the board already installed.
> > 
> > /Tristan
> > .
> > 
> >  
> > 
> 
> 
> [Non-text portions of this message have been removed]
> 
>

Re: [emax] Emax 2 memory

2010-11-24 by Louis van Dompselaar

I think my question was more whether the board would use different PALs with 2MB and 8MB, I wasn't quite sure after reading the document, as it doesn't say anything about swapping PALs for 8MB, but it might have come with different ones in the first place...

My 2MB board does have PALs.


Op 24 nov 2010, om 14:31 heeft tu@... het volgende geschreven:

> The 2MB memory expansion kits included both DRAMs and PALs, so I expect most expansion boards 
> would not have the PALs already installed unless they have all the DRAM sockets filled. But it is 
> possible some may. It is easy enough to check.
> 
> /Tristan
> 
> 
> 



[Non-text portions of this message have been removed]

Re: [emax] Emax 2 memory

2010-11-24 by tu@...

I just checked the memory expansion instructions and you  are correct. The PALs that come installed in the memory expansion board do not need to be 
changed when expanding an Emax II with 2MB on the motherboard to 4MB, 6MB or 8MB. The PALs in the memory expansion kits only need to be 
swapped in when expanding an Emax II with 1MB on the motherboard.

/Tristan

Show quoted textHide quoted text

On Thu, Nov 25th, 2010 at 12:40 AM, Louis van Dompselaar <louis@...> wrote:

> I think my question was more whether the board would use different PALs
> with 2MB and 8MB, I wasn't quite sure after reading the document, as it
> doesn't say anything about swapping PALs for 8MB, but it might have come
> with different ones in the first place...
> 
> My 2MB board does have PALs.
> 
> 
> Op 24 nov 2010, om 14:31 heeft tu@... het volgende
> geschreven:
> 
> > The 2MB memory expansion kits included both DRAMs and PALs, so I expect
> most expansion boards 
> > would not have the PALs already installed unless they have all the DRAM
> sockets filled. But it is 
> > possible some may. It is easy enough to check.
> > 
> > /Tristan
> > 
> > 
> > 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
>

Re: [emax] Emax 2 memory

2010-11-24 by Louis van Dompselaar

So if I ever come across enough DRAM chips (which is a bit IF anyway) I would only need the install disk (if I can get that as well...)

I'm not actively looking for more RAM anyway, it's just if I come across a stash of DRAM second hand it would be good to know if it would be useful to get them.


Op 24 nov 2010, om 15:52 heeft tu@... het volgende geschreven:

> I just checked the memory expansion instructions and you are correct. The PALs that come installed in the memory expansion board do not need to be 
> changed when expanding an Emax II with 2MB on the motherboard to 4MB, 6MB or 8MB. The PALs in the memory expansion kits only need to be 
> swapped in when expanding an Emax II with 1MB on the motherboard.
> 
> /Tristan
> .
> 
>  
> 



[Non-text portions of this message have been removed]

Re: [emax] Emax 2 memory

2010-11-24 by Ted Summers

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@yahoo.se> 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]

Re: [emax] Emax 2 memory

2010-11-24 by Ted Summers

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@gmail.com> 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@yahoo.se> 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]

Re: Emax 2 memory

2010-11-25 by Everett

Ted I didn't forget about you, I just haven't de-racked my emax yet.  I think the list member you speak of upgraded a 2MB model, so that would fit the theory I guess?

--- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:

Show quoted textHide quoted text

>
> 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]
>

Re: Emax 2 memory

2010-11-26 by Simon

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:

Show quoted textHide quoted text

>
> 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]
>

Re: [emax] Re: Emax 2 memory

2010-11-26 by Rish

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]

Re: Emax 2 memory

2010-11-26 by Simon

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:

Show quoted textHide quoted text

>
> 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]
>

Re: Emax 2 memory

2010-11-26 by dwv1957

Doesn't anyone ever check the archives, if you do a search you will find all the info on this, but just for the record-
It does work.
-You need an emax with the expansion board.
-If the emax has 2 meg on the motherboard, you can expand it to 8 megs
-If the emax has 1 meg on the motherboard, you can expand it to 7 megs
-The pals are different on the expansion boards, so you can't use a  board from a 1 meg machine in a 2 meg machine (or vice-versa)
-You need to remove the 93C06 eeprom from the motherboard, be very careful it's a 4 layer board, the best is to snip it out, then desolder each pin.
-Solder in an IC socket, reprogram a new 93C06, plug it in, populate the board with ram, and your good to go.
-Do not turn on the machine with the 8 meg eeprom unless you physically have 8 megs of ram, otherwise you will loose the data in the eeprom, and have to reprogram it.
The 8 meg file for the eeprom is in the files section.

Dave





--- In emax@yahoogroups.com, "Simon" <chevytravelleruk@...> wrote:

Show quoted textHide quoted text

>
> 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]
> >
>