Subj : User Port Pins
To   : All
From : cbmeeks
Date : Tue Sep 25 2018 10:42 am

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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