From: evangagain@gmail.com   
      
   Got to thinking about this again while charging the sucker to make sure my   
   recell held up. Maybe it's just my overactive imagination, but the machine   
   really feels more like a launch-era PS/2 than any of the previous generation   
   PC line machines, down to    
   the Richard Sapper design, use of 3.5" drives, and the refdisk-ish system   
   setup diskette.   
      
   The model numbering makes it a bit of a odd duck, too. None of the other IBM   
   PCs ever de-incremented the 51XX model number - but assuming it was intended   
   to be a "PS/2 Model 40", it'd fill a pretty conspicuous gap in the 1987 launch   
   lineup (30, 50, 60).    
   Notably, one of the Model 40 that ultimately was released in 1992 was the   
   L40SX - another laptop!   
      
   Only real question mark is the one year release date between the PC   
   Convertible (04/1986) and 30/50/60 (04/1987) - Hard to explain how a laptop's   
   specs somehow got finalized and reached production faster than the ostensible   
   desktop counterparts, but    
   close enough to suggest some degree of simultaneous development.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)