Atari 2600 Programming Guide in .pdf format. Written by Steven Wright, this is the definative reference manual for programming the 2600! Left click on the link to view, or hold the SHIFT key and left click to save the document. To get the Acrobat .pdf viewer click here.

6502 OpCode chart - A chart of opcodes for the 6502 with cycle times. I entered the values from a book and have not proof-read it yet, so use with caution!