Documentation on tvcycle

Task: tvcycle
Purpose: Cycle through TV channels to compare different images.
Categories: visual display

        TVCYCLE is a MIRIAD task to cycle through TV channels thus
        allowing different images to be compared.   Use button D
        to exit.  Use button C for local fiddle mode.

Key: tvchan
        List of channels to cycle around.

Key: delay
        Delay in seconds between channel changes. Default is 0.5 s
        This can be altered with the x-location of the cursor.
        The cursor at the left and right hand edges give 0*delay
        and  2*delay respectively.

Key: server
        The TV device where the image is to be displayed. No default. 

Key: options
        reverse   Default is to loop around the channels. For example
                   1-2-3-1-2-3   This options does 1-2-3-2-1-2-3