Subj : Re: User Port Pins
To : cbmeeks
From : Ed Vance
Date : Fri Sep 28 2018 12:53 pm
09-25-18 10:42 cbmeeks wrote to All about User Port Pins
Howdy! cbmeeks,
I couldn't find my C=64 Programmers Reference Manual to help You but
go to www.zimmers.net if You have a internet connection.
He has all kinds of information on Commodore Products.
cb> @MSGID: <
[email protected]>
cb> I'm curious about how to access certain pins of the C64 User Port.
cb> Going by the pinout here:
cb>
https://www.c64-wiki.com/wiki/User_Port
cb> I see there are some pins I'm not familiar with.
cb> 4 CNT1.Counter 1, from CIA #1
cb> 5.SP1.Serial Port 1, from CIA #1
cb> 6.CNT2.Counter 2, from CIA #2
cb> 7.SP2.Serial port 2, from CIA #2
cb> 8./PC2.Handshaking line, from CIA #2
cb> 9.ATN.Serial attention in
cb> ...
cb> B./FLAG2.Flag 2
cb> ...
cb> M.PA2.PA2
cb> I have a basic idea what the counters are for but I'm looking for more
cb> detailed information on all of those pins.
cb> Are there any programming and/or schematics out there that indicate how
cb> to use them in various projects?
cb> Thanks
... "It Shouldn't Be This Hard" - Leo Notenboom
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