I have a question about some mysterious instructions I see being used
by at least two programmers out there.  These are instructions which seem
to compile OK, but I can't find them in either the Microchip literature
(including the Embedded Control Handbook, the Microchip 1994 Databook, or
the 16C61 data sheet) or in the Parallax instruction set.  So where do
they originate?  Are there more instructions usable by a PIC that I don't
know about?

     Here they are:

     skpnc   -->  this seems to mean "skip if the 'carry' register is
                  not clear".


     skpc    -->  "skip if 'carry' register is clear".


     clrc    -->  "clear the 'carry' register".


     setc    -->  "set the 'carry' register".

     skpnz   -->  "skip if not zero" ... seems to pertain to the W
                   register, I think, but does not really specify.



  Thanks,

  Jim Johnson
  jjohnson@hpl.hp.com