deskthority

Ok, I did some reverse engineering. Fun stuff, wrapping your head around pages of assembler. :-)

The communication between the main controller and the trackpoint controller is using some bit-banging protocol.

This is a function that seems is called from what seems to be the main loop:

On first ...

Prior to cutting the traces I took a look at the firmware and - unfortunately - Findecanor was right: The communication is not PS/2, as the host is driving the clock. :-(

I don't have the energy to reverse engineer the protocol, so I'll hope to find a 2-Piece-Trackpoint on the keyboard I ordered ...

Have you read the numbers on the stick's controller chip and looked up what it does?


No, I am not able to decipher it. :-( I tried to google some potential character combinations, but no luck.


I got it now. The chip says:
717A1
HF372
7AV1

My google foo didn't bring up a datasheet though ...

Have you read the numbers on the stick's controller chip and looked up what it does?


No, I am not able to decipher it. :-( I tried to google some potential character combinations, but no luck.


If that is a dedicated Trackpoint controller then it could speak PS/2, but I think it more likely ...

I disassembled my ThinkPad Wired USB Keyboard with TrackPoint .

Unlike the trackpoints on this wiki page the trackpoint on the USB keyboard does not have a controller board itself. Instead it is directly connected to the keyboard controller.

trackpoint.jpg

My assumption is that the mouse ...