Changes in version 2.0.0 beta1 (since version 1.6.1)

• graphical user interface using the FLTK library
• a GUI debugger with support for listing CPU registers, memory dump,
  disassembly, setting watchpoints, and more
• new audio and video drivers with more features and improved quality
• new ROM module that implements a FILE: EXOS device for direct file
  access
• improved tape emulation
• demo recording (snapshot and keyboard events stored in a file)
• external joystick emulation (using the numeric keypad)
• various internal code changes to allow for the emulation of multiple
  machine types
• added Commodore Plus/4 emulator mode with high accuracy and support
  for SID emulation, as well as 1541 and 1581 floppy drives