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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