I'm curious about how to access certain pins of the C64 User Port.  Going by   
   the pinout here:   
      
   https://www.c64-wiki.com/wiki/User_Port   
      
   I see there are some pins I'm not familiar with.   
      
      
   4       CNT1	Counter 1, from CIA #1   
   5	SP1	Serial Port 1, from CIA #1   
   6	CNT2	Counter 2, from CIA #2   
   7	SP2	Serial port 2, from CIA #2   
   8	/PC2	Handshaking line, from CIA #2   
   9	ATN	Serial attention in   
   ...   
   B	/FLAG2	Flag 2   
   ...   
   M	PA2	PA2   
      
      
   I have a basic idea what the counters are for but I'm looking for more detailed   
    information on all of those pins.   
      
   Are there any programming and/or schematics out there that indicate how to use   
   them in various projects?   
      
   Thanks   
      
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