Radio Shack TRS-80 Operation Manual page 82

Computer Graphics Operation Manual
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PAINTT
Paints Screen in Specified Pattern
PAINTT lets you paint a precisely defined pattern using a
graphics technique called "tiling." You can paint with
tiling by defining a multi-pixel grid in an array and then
using that array as the paint pattern.
Example
CALL PAINTT (A,l,V)
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