MOS 6502
From VisualChips
Contents |
MOS 6502 family
We have photographs of the metal and lower layers, the polygons captured, the circuit extracted and we have published a javascript simulator. There is an FPGA project to implement the simulation in hardware. We have (as yet) unpublished simulators in python and C.
Our Analysis
- Collected observations of 6502 layout and behaviour.
- Decode ROM (describing the Atari 6507, not exactly the same as the NMOS 6502 used in the visual6502 simulator
- all 256 6502 opcodes including illegals and their actions
- Comparative photos of the Stack Register in 6502 and 6507
6502 additional information
See also the links page on the main site.
Primary Sources
- Photos of MOS 6502D (also see our website)
- Atari's 6507 Schematics
- Photos of R6502
Secondary Sources
Previous Analysis
- Beregnyei Balazs: 6502 Reverse Engineering (translation)
- Mark Ormston: 65xx Processor Data (version 0.2b)
- Ivo van Poorten: 6502 Bugs List
- Neil Parker: The 6502/65C02/65C816 Instruction Set Decoded
- Graham: 6502/6510/8500/8502 Opcode matrix
- Freddy Offenga: 6502 Undocumented Opcodes
- Adam Vardy: Extra Instructions Of The 65XX Series CPU
