new 6502 CPU description

Pick 6502/NMOS from the language list.

This has slightly more traditional syntax, and some of the opcode descriptions are improved, though I'm not sure this makes a huge difference.

Illegal opcodes aren't supported yet.

65c02 instruction support

Pick 6502/CMOS from the language list.

This supports the basic set of CMOS instructions only.

new 6502 analyzer

This appears as 6502 Constant Reference Analyzer in the analysis options.

Does a better job of handling indexed addressing. The default analysis has a bad habit of treating indexed addressing as a reference to the indexed address, whereas for most 6502 code it should be treated as a reference to the base address.

The (zp,X) addressing mode is still treated as a reference to zp+X.

The 6502 analyzer

installation

The repo contains an Eclipse project. Presumably it's possible to make it generate a .jar file for easy installation, but I don't know how, so for now: import Eclipse project into your workspace, and run Ghidra from inside Eclipse.

Ghidra should build the CPU descriptions automatically, but I've found this a bit flaky. You can build them by running ant in the data folder.

other notes

Known issues: https://github.com/tom-seddon/Ghidra6502/issues