Mouse support - Upgrade request

[insanedude63]

I know this project is probably long since abandoned, but I just recently acquired one of these keyboards myself and was interested in using it. Mine came with the mouse attachment though and it would look nice with the combo setup. I noticed the mouse pin isn't even connected. Is there a way to get the mouse configured?

I noticed someone did a similar project for just the mouse at http://www.rosenau-ka.de/ps2sun/ It would be great if these two projects could be combined together. I don't really understand hardware communication, so don't know how I'd wire this in myself.

[jareklupinski]

Ah interesting! It has been a while and I don't have the original keyboard I worked with, but happy to help you through adding support for this :)

Looking at that link and https://temlib.org/site/?p=337 , it seems that the mouse connects to the keyboard? Then the keyboard DIN plug contains the mouse data on one of the unconnected pins:

For the hardware part, I would start by modifying the symbol of the DIN Socket in the schematic to add the new Mouse-TX pin, then attaching the Mouse-TX pin to another available UART RX pin on the Teensy3.1 (https://www.pjrc.com/teensy/pinout.html 7 or 9) through some level-shifter like the transistor that the Keyboard-TX pin uses (if you are breadboarding, https://www.adafruit.com/product/757 might be easier to use: attach LV to 3.3V and A1-3 to the UART pins on the Teensy side, and HV to 5V and B1-3 to corresponding TX/RX pins on the Keyboard side).

After that is hooked up and the Serial Console shows the Mouse-TX data coming in to the pin correctly, https://www.pjrc.com/teensy/td_mouse.html would be a good place to start translating the serial commands coming from the mouse into td_mouse coordinates, using http://www.rosenau-ka.de/ps2sun/ to unpack the protocol.

[insanedude63]

Wow, I really wasnt expecting to get a response, thank you!
Yeah, there are two sockets on the keyboard, either can be used for the mouse or connecting to the workstation.

I just got done ordering the parts so we will see in a couple weeks if I can't knock out the software portion.