VirtualC64 is a free and open source application that emulates a Commodore 64 personal computer on your Macintosh.
VirtualC64 utilizes a cycle based simulation engine to achieve high compatibility. Although cycle accurate emulation consumes more computing time than, e.g., line based emulation, all modern machines provide enough computing power to imitate a C64 in real-time. Please note that VirtualC64 is still beta! It does not yet reach the awesome compatibility of the classical emulators such as Frodo, Vice, or CSS. However, plenty of games are already running and the list of compatible applications grows with every new release. Right now, VirtualC64 supports the following file formats: D64, T64, PRG, P00.
VirtualC64 neither supports ancient devices such as virtual dot matrix printers, nor does it offer thousands of preference switches like other emulators do. VirtualC64 pursues the philosophy that typical actions must be easy to perform. E.g., to load a game, simply drag the file into the main screen. Installing ROM images works the same way.
The debug panel opens up when you click the Inspect button in the upper right corner of the toolbar. The panel lets you peek inside the virtual computer. E.g., you can inspect the CPU, RAM, ROM or one of the custom chips with a single click. In addition, VirtualC64 provides the main functionality of a typical source-level-debugger. You can freeze emulation any time, set breakpoints or memory traps, or single-step through your program.