Memory Upgrade

This involves increasing RAM from 16K to 64K, 

  - Replayce 4517/4416 RAM chips with 4164 DRAMs 
  
  - Setting jumper(s) to enable 64K (usually J1/JP1)
  
  - Installing an EPROM for ROM upgrades (if needed)

Two of the D4164C chips installed in one of my CoCo2s.