I started teaching myself 6502 assembly by working through Jim Butterfield's   
   excellent Machine Code for the Commodore 64 and using his equally excellent   
   Supermon64. After I had learned the basics, I wanted to study some real code   
   and Supermon64 seemed    
   like a good place to start.  I tracked down the sources that were originally   
   posted to comp.cbm.binaries and uploaded them to Github: https:/   
   github.com/jblang/supermon64.   
      
   The code was almost completely uncommented but at least with the labels it was   
   easier to understand than a disassembled binary.  I went through the code and   
   studied it line by line until I understood it fully, commenting as I went.    
   The result is here:    
   https://github.com/jblang/supermon64/blob/master/supermon64.asm   
      
   I've also disassembled the relocatable code stub, for which the source was not   
   included, commented it, and included it here: https://github.com   
   jblang/supermon64/blob/master/relocate.asm   
      
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