View source for 6502 instructions

Below are some references for the 6502 instruction set:

* http://www.obelisk.demon.co.uk/6502/reference.html - Instruction reference with flag behavior and timing
* http://users.telenet.be/kim1-6502/6502/proman.html - MOS 6502 programming manual
* http://nesdev.org/6502_cpu.txt - Includes tick-by-tick breakdowns of instructions (see [[CPU interrupts]] for breakdowns of interrupts)
* [http://visual6502.org/ Visual 6502] can be used to figure out obscure instruction behavior. There's also a [http://www.qmtpro.com/~nes/chipimages/visual2a03/ 2A03 version] available (please avoid shift-reloading it as it is hosted on a limited uplink; normal reloading should work fine and should catch any updates to the data files).
* [[Programming with unofficial opcodes]]
* [[CPU unofficial opcodes]]
* [[6502 assembly optimisations]]