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PENCOLOR.HLP
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pencolor -- Command, one input. Abbreviation: penc
This command applies only to the display turtle. Its effect is dif-
ferent depending on how each type of terminal supports color. For the
Atari, the input must be an integer between 0 and 6. An input of 0
enters black-and-white display mode (which is the turtle's initial
mode), in which lines are as thin as possible but there is no control
of color. Any other input selects color mode, in which lines are
twice as thick, so the effective size of the screen is smaller, but
colors can be used. There are, in color mode, three possible pen
colors, numbered 1 to 3. There are 256 possible colors, but only
three can be on the screen at a time; the setcolor command is used to
decide which pen draws in which actual color. If the input is 4, 5,
or 6, the color is that of pen 1, 2, or 3, respectively, but lines are
drawn in "fill mode": for each point inked, all points to its right
are also inked until a point is reached which was already inked. On
the Gigi, there is only one mode, and there is no loss of resolution
in using color. The input must be between 0 and 7; 0 means black, 7
means white. The ADM, Tektronix, and Sun displays do not have multi-
color drawing.