OldschoolEngine 2 Emscripten port

Minimal line-based Commodore 64 emulator that emulates just enough to run the recent Covert Bitops C64 games (Hessian, Steel Ranger...) This is a C++ / Emscripten port that runs on web pages.

The original "oldschoolengine" ran on GameBoy Advance to run Metal Warrior 4, and it used a custom API for graphics, sound and file access. In contrast, this project emulates a limited subset of an actual C64, so that the game can run unmodified.

Features:

• CPU emulation based on EMU6502 code by Yve Verstrepen
• Parts of SID emulation (noise, filter) based on jsSID by Mihaly Horvath
• Emscripten build system & OpenGL initialization based on tiny_chess by Jukka Jylänki
• Line-based VIC-II rendering
• Raster interrupt + partial CIA1 Timer A emulation
• Joystick port 2 control with arrows + ctrl as fire button
• Keyboard input
• D64 & D81 image support, loading / saving via minimal (and incorrect) Kernal routine traps
• Save file persistence

TODO:

• Full key mappings

Licensed under the MIT license, see the code for details. Use at own risk.

Building

To build, the Emscripten compiler (emcc) and CMake are needed. Invoke CMake by specifying the generator and path to Emscripten's CMake toolchain.

cmake . -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=MyPathToEmscripten.cmake