This is a list of things that need to be done
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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 Correct handling of 5200 controllers
