; TVOFF
;---------------------------------------------------------------
;! Verb which turns off TV channel(s).
;# VERB TV
;-----------------------------------------------------------------------
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;-----------------------------------------------------------------------
TVOFF     LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
TVOFF:  Verb which turns off TV channel(s).
COLORS         0.0        3.0      TV colors to enable
TVCHAN         1.0       16.0      TV channels to turn off

          The desired channels may be given instead as an
          immediate argument to TVOFF.  In that case, the
          channel specification is a BINARY mask of the desired
          channels.  Example:  TVOFF(13) will turn off TV
          channels 1, 3, and 4 (values 1 + 4 + 8 = 13).
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TVOFF
Type: verb
Use:  Turn off (disable) one or all colors on one or more gray-scale
      image channels on TV.  Does not affect status (on or off) of
      colors or channels not specified.

Adverbs: TVOFF takes an immediate arguement specifying, in BINARY
         code, which channels to turn off.  E.g. TVOFF(43) disables
         channels 1, 2, 4, and 6 (values 1 + 2 + 8 + 32 = 43).

  COLORS.....Specifies which colors to disable.  0 = all, 1 = red,
                2 = green, and 3 = blue.
  TVCHAN.....TV channel to turn off.  Only used if immediate argument
             is omitted and specifies a single value.  0 -> 1
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