From: richvh@citlink.net   
      
   maboytim@gmail.com wrote:   
   > Anyone have a use for 16 MK4564N-20 DRAM chips.  These are 64kx1, I   
   > think compatible with 4164's.  Genuine Mostek, date code 8341 and   
   > 8342.  Maybe these can be used to upgrade Coco's or Model 4's?   
   >   
   > Matt   
   >   
   Probably useable in CoCos, but Model 4s are finicky - they only play   
   nice with 128 cycle refresh chips (without hardware mods), and many   
   (most) 4164s and compatible chips were 256 cycle refresh.  You'd have to   
   check a datasheet for them to tell which way they refreshed.   
      
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