Emax

if some one is willing to donner there board then duplicating it is not a problem x ray scanning the board and using the scan in eagle is possible as we have done it for asr10 sp3 scsi interface which is a 4 layer board and the production costs for resale worked out at £120 which is cheap as the original was £300 from ensoniq

it can be done and you can use a logic scanner for the functions of the pals its not impossible and thats how manufacturers upgrade there boards with new tech for old industrial computers

it would be nice if we could get the bin files for the pals we would have to ask rob if he could find out if the bin files are still available 
  ----- Original Message ----- 
  From: dwv1957 
  To: emax@yahoogroups.com 
  Sent: Tuesday, December 01, 2009 4:38 AM
  Subject: [emax] Re: Memory Upgrades


    
  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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