Upgrade switch less trak-ball to switched.

[Fruktodlaren]

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. 

[BigO]

Single Pole Double Throw.

 

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