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4 68K Assembler Reference
  Amiblitz3 contains the full 68K instruction set (also 68020 and FPU) as inline assembler.
  You can simply write any time in your source code some lines of assembler
  and continue with Basic functions.
  The following registers are used across basic functions and must not be trashed:
  A4 is reserved for the local variable base within functions
  A5 is reserved for the global variable base
  A6 is reserved for library access
  D7 is reserved for intermediate results between Basic code

  ...and of course the Stack should not be trashed.
  A full reference of 68K Instuctions will not be described in this document.
  Check the Internet.

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