C64 I/O pinout

From: Charles Oblender <charlesII_at_nwonline.net>
Date: Thu Sep 16 19:49:49 1999

After searching all over the internet for this I've found the pin out
for the C64 serial port. The goal of finding this information: to
connect serial port of the C64 to the RS232 serial port on my computer.
Here's what I found.

Pin, description
1, ?
2, GND
3, ATN
4, CLK
5, DATA
6, RESET

The description that I found didn't list pin 1 for anything could this
possibly be +5V? If so I could connect this to CTS (I'm trying to keep
to the standard). ATN is probably attention which tells what device the
computer is going to talk to. CLK is probably a clock signal which
could be connected to Receive Clock. Could ATN be connected to DCD on
the PC? Also what are the logic levels on the C64 port is it inverted
compared to RS232 when it comes to 1 and 0 and what is the voltage on
pin five for 1 and 0.





Charles
Received on Thu Sep 16 1999 - 19:49:49 BST