From: joe@user.com   
      
   "N Morrison"  wrote in message   
   news:1186782746.889257.304540@x40g2000prg.googlegroups.com...   
   >   
   > For Model I's, you need the Expansion Interface PLUS the Serial card -   
   > very hard to find now.   
   >   
   > Model III or 4 with disk is fine as they have serial ports. IIRC the   
   > speed will run no more than 2400 baud, say, if you are scrolling text.   
   > The processor just can't keep up.   
      
   If I remember right, the serial card on Model III's was bundled with the   
   disk systems but only factory built.  If it was upgraded, then it was an   
   add-on.  It was relatively cheap, and I've not really seen any without it,   
   but that could be the case.   
      
   The Model I EI serial ports are scarce.  What was out there seemed to   
   be scarfed up quick.  I do recall an aftermarket board for at least a while,   
   but I never really looked into it so I don't know how popular it was.   
      
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