This is a list of things that need to be done
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o Find out why so many games do not run in AtariXL or AtariXE mode. Those
  games surely run OK on original AtariXL, as well as they do run under
  Xl-it! in 800XL mode. Just here on Atari800 the games crash or reboot
  the emulation. That's why the emulator needs to run in Atari800 mode
  nearly all the time (except BASIC programming).

o Improve DOS sound support (by using interrupt driven sound blaster driver)

o Speed up the Falcon emulation - it's horribly slow ATM.

o The obsolete variable "countdown_rate" is still in use within
  "atari_amiga.c" this should be a trivial change, however I'm reluctant
  to do it without an Amiga to check it. I've left it defined in "atari.c"
  so that there are no linker errors on the Amiga.

o Support for optional X11 private colormap

o Correct handling of 5200 controllers
