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#1 2009-09-30 15:56:57

misjah
Bloody beginner
Registered: 2009-09-30
Posts: 6

Strange problem with pots

Hello. I just started modifying c64 for use with prophet64 software. The casing is done, painted black breadbox case, holes for pots etc. I`m totally new with soft but I have some skills with soldering and electronics. I tried every schematic for wiring pots (100 and 500K) but it`s just not working. I used potmon.prg to test out pots but I get error: illegal quantity error in 8823, even when there is nothing attached to joy ports.
Don`t have a floppy device and I`m using xe1541 cable to load programs. (tape too)
Any suggestions or another wiring diagram? Maybe software is causing problems.

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#2 2009-09-30 16:07:20

D Vibe
The Last Ninja
From: Sweden
Registered: 2007-02-03
Posts: 254
Website

Re: Strange problem with pots

Hmm.

Try with another c64. Surely sounds like some hardware error with the joystick ports if you get error when nothing is connected to it. I don't know anything about the potmon.prg though. Try the pot tester in P64 instead.

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#3 2009-09-30 16:15:07

D Vibe
The Last Ninja
From: Sweden
Registered: 2007-02-03
Posts: 254
Website

Re: Strange problem with pots

Check this image out. It helped me when I buildt my potbox:

http://www.getlofi.com/uploaded_images/Prophet64PotMod-766055.JPG

Also check this thread:
http://www.prophet64-forum.com/viewtopic.php?id=814

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#4 2009-09-30 16:19:44

D Vibe
The Last Ninja
From: Sweden
Registered: 2007-02-03
Posts: 254
Website

Re: Strange problem with pots

Check this image also:
http://www.firestarter-music.de/prophetcart/pots1.jpg

It helps you to find the right pins...

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#5 2009-09-30 16:28:44

misjah
Bloody beginner
Registered: 2009-09-30
Posts: 6

Re: Strange problem with pots

Wow, that was a quick one.
Yes, I tried this one first and the one with 4.7n capacitors. I downloaded montools from here:
http://www.bigmech.com/misc/c64mods/ctrlport2.html

And then I extracted only prog for pots since I can`t load all D64 files. .prg files are working good when loading via xe1541 cable. Maybe this is the problem since it`s not complete disk. Any other prog for testing?

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#6 2009-09-30 17:32:31

misjah
Bloody beginner
Registered: 2009-09-30
Posts: 6

Re: Strange problem with pots

The last one you posted is actually working! I loaded bass line and it moves knobs, success. Definetely software problems.
Thanx alot for you help.

Last edited by misjah (2009-09-30 17:32:48)

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#7 2009-09-30 20:49:05

D Vibe
The Last Ninja
From: Sweden
Registered: 2007-02-03
Posts: 254
Website

Re: Strange problem with pots

Great that you got it to work! smile

Happy tweaking! smile

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#8 2009-10-01 18:32:10

misjah
Bloody beginner
Registered: 2009-09-30
Posts: 6

Re: Strange problem with pots

Thanx, just one more question.... do I need to put switch for normal joystick use or I can just plug joystick in since this will be internal soldering?

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#9 2009-10-01 18:37:20

D Vibe
The Last Ninja
From: Sweden
Registered: 2007-02-03
Posts: 254
Website

Re: Strange problem with pots

I think you need to put a switch. I've solved it by making an external pot box instead; so it's just to disconnect the potentiometers when I want to use a mouse or a joystick..

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#10 2009-10-02 01:37:26

misjah
Bloody beginner
Registered: 2009-09-30
Posts: 6

Re: Strange problem with pots

I`m still having some problems. Pots attached to port 2 are working great but port 1 is causing some problems. First pot behaves like a switch, when moved to left, knob goes to zero, when moved to right just a little knob instatntly goes to max. The second one is working good but when I move first pot this one also moves. I checked connections three times and even swapped pots but it`s the same thing. Could it be that port 1 is bad!? Joysticks are working fine but they don`t use same signals.

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