From: joe@user.com   
      
   "Ian Mavric"  wrote in message   
   news:fqsuac$qa7$1@otis.netspace.net.au...   
   > Hi, can someone show me a link to an article on how to modify the Mod 1 to   
   > take 64K in the keyboard unit, thus leaving the EI empty of Ram chips.   
   >   
   > I thought 80micro would have how to do it but surprisingly let me down   
   this   
   > time.   
   >   
   > Ian.   
   >   
      
   There were a couple of ways to do this.  One was to just put the chips   
   into the memory sockets, and then kludge the address decoding.  But that   
   was really just 'using' 64K chips.  You still had the same memory map,   
   meaning 48K max for memory.  There were a few other small things you   
   had to handle as well, but it wasn't that difficult.   
      
   There was a mod, actually a couple of them, that consisted of a small   
   circuit board that went under the Z80.  Basically it just pulled all the ram   
   from everywhere and put it on this small board.  On the board was logic   
   to 'switch' the ram in and out for the first 16K, essentially giving the   
   machine a full 64K RAM space.  This was needed to run a more 'true'   
   version of CP/M than could be run in a ROM system.   
      
   Looking for articles about CP/M on the Model 1 might be a good place   
   to start.   
      
   Mike   
      
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