Ok, so I know I'm replying to an ancient thread but since   
   there was never a specific answer I thought i would provide   
   one (and this was one of my favorite episodes). It looks   
   like the very first color *laptop* computers were introduced   
   in 1989:   
      
   "WOOD DALE, Ill., Sept. 25-- The NEC Corporation introduced   
   what it said was the first color laptop computer available   
   in the United States. The company said it expects to start   
   shipping the laptop, the Prospeed CSX, in mid-October. It   
   will retail for $8,499 to $9,499, depending upon storage   
   capacity.   
      
   The computer uses the Intel Corporation's 80386SX   
   microprocessor and uses liquid crystal display technology to   
   provide 16 colors simultaneously from a palette of 64   
   colors, the company said. NEC said the laptop weighs 18.5   
   pounds, including the built-in power supply. The laptop is   
   15 inches wide, 14.4 inches deep and 4 inches high."   
      
   http://www.nytimes.com/1989/09/26/business/company-news-nec-show   
   -color-laptop-computer.html   
      
   So a color laptop certainly would not have been an   
   impossibility in 1989 (depending on exactly when in 1989   
   anyway...I can't recall if a specific date was given).   
      
      
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