In wwwBASIC, PRESET does the exact same as PSET when no color is specified: they both set the pixel color to the foreground color.
In BAM, PRESET now sets the pixel color, when a color is not specified, to the background color.
This is a mod of a program Richard Keijzer wrote in TRS-80 Level II BASIC (44 years ago) and recently shared with the BASIC Programming Lang...
 
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