Jump to content
Sign in to follow this  
Fruktodlaren

Upgrade switch less trak-ball to switched.

Recommended Posts

Greetings. Old forum lurker here in need of some part-specific information regarding the physical switch on the switched CX22 trak-ball. The following text is mostly a copy paste of an old post (edited to become shorter) I did in a FB group for trak-ball enthusiasts.

 

I recently (Dec 2020) came into possession of a Pro-line CX22 Trak-ball in a mostly decomposed box. New as I am in the wonderful world of sphere-based XY position devices, I had no idea that I should have asked about the switch... Turns out it's one of those first units without the trackball/joystick option switch. That was a bummer for me to discover as I wanted to use it mainly as a trackball on my Vectrex.

 

Edit: Then I was asking if there was a way to put that functionality back in. Someone pointed me in the direction of the CX22 schematic where the circuit with the switch is also showing. Link below. 

http://www.atarimuseum.com/ahs_archives/archives/files/videogames/consoles/7800/7800trakball/7800trakball-cx22-patch.gif

 

Such a modification seems doable but is going to take some surgery to the PCB, but I'm not afraid of that. I ordered the missing components (that I didn't already had on hand in my parts box) from ebay. Mainly the inductor and the IC responsible for the switching of signals when the physical switch is flipped.

 

Right now I am hung up on the actual switch. What kind and type of switch is it?
Is it a four pole double throw switch?

If anyone can shed some light on this trivial matter that somehow is holding me back from going ahead with the modification, I would appreciate it greatly. 

Share this post


Link to post
Share on other sites

Single Pole Double Throw.

 

The 4019 ic is effectively the 4PDT switch you mention. It is controlled by the SPDT switch.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...