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MOS-6502 Emulator

MOS-6502 Emulator

This is a complete emulator of the original MOS Technology 6502 microcontroller from 1975. It is written in C++.

The emulator works by providing a shared memory bus, to which one can connect devices. Each device is allocated an address range, in which it can provide its functionality. This allows the program to change audio-output and draw graphics by simply writing a value to a specific address.

Below you can see the virtual monitor displaying a pong game. The game is implemented completely in the 6502-Assembly language.

Pong Game

Custom modifications

Since the original 6502 didn't use all available opcodes, a custom one was added. You can see a list of unused 6502 opcodes here.

Instead of halting the CPU, it now waits until the next interrupt happens.

  • 0x02 - WAI Same behaviour as on the WDC 65C02.

Contributors

  • Leonard Schütz, Lead Developer @KCreate

License

MIT License

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