PRESET
Purpose
PRESET erases the specified dot.
Form
PRESET( <X> i <Y»
Description
(1) (<X>, <Y» are the coordinates on the world coordi
nate system, and can be written using a numeric expres
sion. It spreads background color> on the (<X>,<Y>)
dots.
(2) For monochrome displays, it turns the dot OFF.
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