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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