Does anyone understand this...

[gdesroch@slate.mines.colorado.edu (DESROCHERS GARY FREDERIC)]

     I need to know what a 

BIT $CFFF

does.  I don't need breif answers like 'It clears all I/O ROMS'
or 'It switches out C8 ROMS.".  I can get these out of the IIc rom listing
and II plus listing that I have.  What does it do?!?  The best answer would
be as technical as you can give me or where I can get the answers.

     I appreciate anything you can give.

Gary
gdesroch@slate.mines.colorado.edu
  
-- 
Gary F. Desrochers
gdesroch@slate.mines.colorado.edu