This is an assembled prototyping daughterboard for the Netcruzer SBC66 line of Single-Board Computers. It mounts on top of the SBC66 board, into the daughterboard connector. The PT02TC comes assembled with the pins installed as shown. All port pins of the SBC66 board are marked clearly on the prototyping area.
The picture below shows this daughterboard module mounted on an SBC66EC.