Re: C64 Keyboard Scanning

From: William Levak (
Date: 2000-10-11 06:09:26

On Tue, 10 Oct 2000, COPLIN, Nicholas. wrote:

> I'm wanting to drive something off the Joystick ports (eg a rumble-pack type
> device), but I want it only to respond to specific codes, not the keyscan
> routines.  I'm hoping that I can use illegal joystick moves as a code (ie
> grounding left and right at the same time), but this won't work if the
> keyboard routine also grounds more than one line at a time.

You can read all possible combinations of joystick lines.  Some time ago,
I wrote a joystick test routine. It recognizes all "illegal" combinations
and reports the "error".  To test that this is possible, I took apart a
joystick and manually made all possible combinations of connections. 

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