Here is another website from ibm about trackpoint:

http://wwwcssrv.almaden.ibm.com/trackpoint/

It has Engineering Spec's, circuit design instructions, etc.

Barton Smith/IBM told Till Straumann where to find information about the
trackpoint internals on 7/28/2000.

I have a question. While the generic LINUX driver for the PS2/aux
(`psaux') can provide basic support to read/write byte streams from/to
this device, why trackpoint of the Z50 doesn't work on NetBSD?

---
Lou