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BASIC - graphics
http://www.civl.port.ac.uk/Teaching/basic/graphics.html
Complete tutorial on making graphics with BASIC.
Introduction to BASIC - Graphics
http://home.messiah.edu/~deroos/CSC171/Proj11/Proj11a.htm
Tutorial on graphics in QBasic.
Zephyr Software
http://www.zephyrsoftware.com/
SVGA graphics libraries for several languages, including PowerBasic and QuickBasic.