On Fri, 30 Aug 2002, Derek Peschel wrote:
  No, but I do know that the same feature existed
on the //e (i.e. before
 the //c came out) but it was only accessible by changing internal
 wiring. I read about this in an issue of Call A.P.P.L.E. which (of
 course) I no longer have. 
 Wow, crazy.  I never knew that, or even heard of it.  In fact I want to
 see a source before I believe it :)