Commodore C64 Game Source Code

Purpose

• Start with an old Commodore C64 game disk which is as close to the original as possible (g64 or nib).
• Include the copy protection.
• Produce a commented assembler listing which reassembles to an exact copy of the originaL binary.
• Make the source as variable as possible to allow any kind of modifications, data area and code relocation.
• Sometimes add some own ideas to the game soures code for fun and as a proof of concept.
• Sometimes add a (simple) level editor.

Published so far

• unmodified
  • Loderunner https://github.com/Piddewitt/Loderunner
  • Championship Loderunner https://github.com/Piddewitt/Championship_Loderunner
  • The Castles of Dr Creep https://github.com/Piddewitt/The-Castles-of-Dr-Creep
• modified
  • Hansmanns Loderunner https://github.com/Piddewitt/Hansmanns_Loderunner
  • Hansmanns Castles of Dr Creep https://github.com/Piddewitt/Hansmanns-Castles-of-Dr-Creep

Tools used

• Assembler: 64tass
• Disassembler: 65xxDis
• Disk manager: DirMaster
• Emulator: WinVice
• Converter: NibTools

Project

• All content comes as a Notepad++ project

Directory structure

• dox - Additional documentation
• npp - Notepad++ modification instructions / language files / toolbar icons
• C64
  • tools
    • 64tass
    • DisAsm
  • asm
    • Projects
      • file: npp_project_name.xml
      • Data
        • inc - C64 system includes
        • originals - Game sources
          • c64_game
            • asm - Source code
            • d64 - C64 disk files
            • dis - Disassemblies
            • inc - Game includes
            • lst - Assembler listings
            • prg - Binaries
            • xtra - Additional files
            • file: all.bat - Call both, 64tass and 65xxdis
            • file: asm.bat - Call 64tass
            • file: dis.bat - Call 65xxdis
        • mods - Modified games
          • c64_game
            • [same structure as above]