W65C816

An emulator for Western Design Center's W65C816S, a 16-bit derivative of the WDC W65C02S, which is itself a derivative of the MOS 6502.

I'm developing this as there doesn't appear to be any existing standalone '816 cores in Rust, and certainly not at the level of emulation I'm doing (though we can go deeper!). For other programming languages, 816 cores seem pretty sparse, and as far as I know, none provide a bus-accurate cycle-accurate emulator with all signals.

Testing

This core has been validated against this test suite and passes all tests. The core has not been validated against actual hardware.

Current plans:

• continue adding instructions
• continue adding addressing modes
• ensure ABORT is implemented for all instructions
  • ensure ABORT is implemented correctly (check with a real '816)
• tests, tests, and more tests
  • ideally generate tests from a real '816.