| Both include PACE (Palm Application Compatibility Environment) which enables 68K applications to run on these Palm OS versions as well. | 
      
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68K:
    The term 68K processor refers to the family of Motorola 68000 processors. 
   ARM:
    The term ARM processor refers to the family of Advanced RISC Machine processors. 
    An ARM processor is a type of 4-byte RISC processor, and is available from many sources.