ready.
Registered: Feb 2003
Posts: 441 |
CIA 1 timer output on PB6 / PB7
hello all,
I am working on a project where I want to use the timer outputs of the CIA. According to the C64 spec CIA 2 ($DDOO-$DD0F) has the capability to send its timer outputs to the user port on pins PB6 and PB7. Looking at CIA 1 its PB6 and PB7 go are used for the keyboard as input pins.
Now, I wonder if I could set them for output (using $DC03) and read the PB6 and PB7 pins from somewhere. Or maybe do I have to do a little hardware hack and connect two wires: one to PB6 and one to PB7 to bring these signals to the outside? But then I would have a conflict with the keyboard...
Has anybody ever tried anything similar? |
