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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.
-