Added the STEP keyword as an option for both statements.
The PSET graphics SCREEN statement sets a pixel at a specified coordinate to a specified color attribute, or the current foreground color if a color attribute is not specified. When the STEP keyword is included, then PSET sets a pixel at a coordinate that is relative to the most recently referenced point.
PSET (column%, row%)[, colorAttribute]
PSET STEP (column%, row%)[, colorAttribute]
The PRESET graphics SCREEN statement sets a pixel at a specified coordinate to a specified color attribute, or the current background color if a color attribute is not specified. When the STEP keyword is included, then PRESET sets a pixel at a coordinate that is relative to the most recently referenced point.
PRESET (column%, row%)[, colorAttribute]
PRESET STEP (column%, row%)[, colorAttribute]
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