From: mitch2gs@hotmail.com   
      
   KP  wrote:   
      
   >Is there a way (other than, for example, trying to play a DHR game like Bad   
   Dudes on it) to detect whether my white-keys //e is a Rev. A or Rev. B?  It is   
   enhanced, for what that is or is not worth.   
      
       The most fool proof method is to look at the motherboard itself.   
   Examine the part number at the top-center, above the card slots.   
      
       You will see 820-0064-A for the revision 'A', and 820-0064-B   
   for the revision 'B'. Note there was a third revision that used the   
   'A' label again, and that was 820-0087-A, but is functionally a 'B'   
   revision board. iI is notable for having a 1984 copyright date   
   and the Enhanced chip part numbers silked screen on the board.   
      
       Of course the motherboard used in the Platinum Apple IIe is   
   also functionally a revision B board. I don't know the part number   
   off the top of my head, but it is visibly different as there are far   
   fewer chips present (firmware combined into "CD" ROM, and   
   just a pair of 64Kx4 DRAMs. Also likely a 1986 copyright date).   
      
       I believe Apple recommended against installing the Enhanced   
   chipset in rev 'A' boards, but it would still work. You just would not   
   have the capability to use Double-Lo/Hi-Res graphics or have   
   the special video data signal accessible through slot-7.   
      
   Mitchell Spector   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)