Emax

This is another case where, if people find a dead emax 2 it would  
possibly still be worth something just to get the expansion board if  
the dead unit has one, to put into a working unit.


On Nov 30, 2009, at 8:38 PM, dwv1957 wrote:

You are exactly right Ted, the expansion board has 4 PALs on it plus  
some 74HCxxx chips on it, it is also a 4 layer board, so the amount of  
work it would take to duplicate it is just not worth it.
As for "stacking" chips on the motherboard's 18 pin sockets, not a  
hope in hell of that working (sorry).
The only way to upgrade the Emax2, is to have the original upgrade  
board, as long as you have that, you can upgrade it to anything you  
want.

Dave

--- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:
 >
 > My understanding is that the RAM expansion board has PALs that go  
with it.
 > Getting the PAL binaries for the SCSI update wasn't easy for Rob at  
Emulator
 > Archive.
 > Even if you duplicated the PCB, you would have to be able to make  
the PALs
 > that allow the access to the extra memory.
 > You would need the original PAL binaries for that.....
 >
 > Otherwise the Emax wouldn't be able to address the additional  
memory....
 > even if it was physically installed.
 >
 > Someone correct me if I am wrong in my understanding of what was  
discussed
 > previous on the thread.
 >
 > Regards,
 > Ted
 >
 >
 >
 >






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