Known Issues - QB64Official/qb64 GitHub Wiki

The first rule regarding whether or not something should be on this list is the question of whether or not there is a difference of behavior between QB64 and QBasic 1.1 and/or QB4.5 (for core commands). As for additional keywords (underscore commands), there may be some gray area regarding what it should / shouldn't do and will need to be discussed further before including on this list.

As a general reference, please see Keywords currently not supported by QB64.

PAINT (Pattern)

The Tile Demo Sample is very different in QBasic versus QB64; specifically, the pattern simply isn't painted. See #2.