; GROFF
;---------------------------------------------------------------
;! turns off specified TV graphics channels
;# Verb TV
;-----------------------------------------------------------------------
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;;
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
GROFF     LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
GROFF:  Verb to turn off graphic channel(s).
GRCHAN          1.0   88888888.0   Graphics channel(s)

          The desired channels may be given instead as an
          immediate argument to GROFF.  Example:  GROFF(13)
          will turn off Graphics channels 1 and 3.
          If both GRCHAN and the immediate argument are zero,
          all Graphics channels are turned off.
----------------------------------------------------------------
GROFF
Type: Verb
Use:  Turn off (disable) one or more specified TV graphics
      channels.  Does not affect status either on or off
      of channels not specified.
Adverbs: GROFF takes an immediate arguement specifying
         in decimal code which channels to turn off.  E.g.
         GROFF(43) disables graphics channels 4 and 3.
  GRCHAN......Graphic(s) channel.  Only used if immediate
         argument is omitted.
      If the resulting channel number is zero, then all
      Graphics channels are disabled.
----------------------------------------------------------------