CCS64 is a shareware C64 emulator for MS-DOS created by Per Håkan Sundell . This is a free Unix/X11 port created by Marko Mäkelä . The user interface is covered by the GNU Library General Public License, but source code for the emulator engine itself is not available. The emulator uses a cycle-based model, and because it is event-driven, it is considerably faster than FrodoSC and usable even on low-end Pentiums (P75 tested). See for more information about the MS-DOS version of CCS64.