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2012-10-22 08:57

Frantic

Registered: Mar 2003
Posts: 1641

Foot pedal for C64 control port (like a "paddle")

Hi!

I was pondering the possibility of connecting a foot pedal (or two) with a potentiometer inside, and use instead of a paddle. However, I suck at electronics, so therefore I would like to ask:

Am I right if I believe that not much is need except using a pedal like this one:
http://www.sweetwater.com/store/detail/EB6165/

...and then just solder a cable to the control port in accord with Ray Carlsen's info:
"Electrically, one end of a pot is wired to the +5V source (pin 7) and the slider contact to one of the two POT inputs (pin 5 or 9). Turning the control changes the pot resistance from a maximum of 470K ohms (at full counter-clockwise) to zero ohms (full clockwise). The voltage on that corresponding POT line goes from about 1 volt DC at maximum resistance to +5 volts at minimum resistance of the control."

I think the paddles use 470k ohm potentiometer, and the pedal I linked to above is 500k ohm, but I know atari paddles can be used without problems for the C64 and they are 1000 ohm (when max value is reached, and you continue to move, nothing more happens).

...or is it more complicated than this?

EDIT: Uhm.. seems as if mono pedals (for guitar) are 250k ohm, so I am not entirely sure in what sense the stereo pedal linked to above is "500k ohm"... 250k ohm on each line (L and R)?

2012-10-22 10:24

chatGPZ

Registered: Dec 2001
Posts: 11293

a) its that easy - you just connect whatever poti and it'll work.
b) the most important thing is the characteristics - pots are either linear or logarithmic, only one of them will work well as a paddle (and i forgot which, but google should tell you =P)

2012-10-22 10:45

Frantic

Registered: Mar 2003
Posts: 1641

Thanks!

"whatever poti" you say.. but a 250k ohm potentiometer wouldn't reach the full range of 00-ff when converted to digital by the SID, right?

2012-10-22 10:48

chatGPZ

Registered: Dec 2001
Posts: 11293

yeah, if its max. resistance is too small then you wont be able to use the full range.

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