A MOS 6502 CPU emulator written in Delphi (a very basic C64 + VIC20 emulator included)
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##MOS6502 Emulator in Delphi##

This is the Delphi / Pascal port of the C++ implementation for the MOS Technology 6502 CPU by Gianluca Ghettini. The code is written to be more readable than fast, however some minor tricks have been introduced to greatly reduce the overall execution time.

Main features:

  • 100% coverage of legal opcodes
  • decimal mode implemented
  • read/write bus callback
  • jump table opcode selection


The port was written with minor changes to the original file: the run(N) function was replaced by a single Step() function - if you need to run more than one cycle, just put that function inside a loop.

6502 functional test

The 6502 functional test (version 16-aug-2013) by Klaus Dormann is included.

C64 emulator

A very basic C64 emulator is included. You need to download the BASIC ROM basic.901226-01.bin and the Kernal ROM kernal.901227-03.bin and put both files inside the ROMs folder. Install the commodore CBM.ttf font found in the VICE package.

The C64 Emulator uses a symbolic keyboard translation thus any keyboard layout should work.

This C64 emulator is just a a very basic 6502/6510 emulation example and is not feature complete. Please take a look at VICE - Versatile Commodore Emulator instead.