6502 instructions: Difference between revisions
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* http://nesdev.org/6502_cpu.txt - Includes tick-by-tick breakdowns of instructions (see [[CPU interrupt quirks]] for breakdowns of interrupts) | * http://nesdev.org/6502_cpu.txt - Includes tick-by-tick breakdowns of instructions (see [[CPU interrupt quirks]] 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). | * [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]] | |||
Revision as of 07:10, 12 April 2013
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 interrupt quirks for breakdowns of interrupts)
- Visual 6502 can be used to figure out obscure instruction behavior. There's also a 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
