Graphics primitives
PlottingInScreenThirteen - Plotting graphics using POKE and PEEK. (PSET replacements)
AntiAliasedLinesInScreenThirteen - Drawing an anti-aliased (blurred at the edges) line.
SetVideoSegInScreenThirteen - How to enable double buffering.
SuperPutInScreenThirteen - Faster and better PUT replacement by Plasma.
More complex graphics techniques
ShakingTheScreenInScreenThirteen - Shaking screen effect.
PaletteInScreenThirteen - Screen13h / VGA palette creation / general palette idea
DoubleBufferingInScreenThirteen - What is double buffering and how is it done?