Just a note that we moved the MRServo switch machine design over to GitHub:

https://github.com/IowaScaledEngineering/mrservo

The design files and source code were previously available via zip file and SVN, but now should be more convenient to access for those of you who might want to build your own.

MRServo is an open-source servo switch machine controller.  It has 3 flavors: controller-only, controller + accessory contacts, and controller + intelligent frog power switching.  The design is based around a 6-pin PIC10F200 microcontroller.  All the hardware design files (gEDA gschem/pcb) and source code can be accessed at the Git repository above.  And, as always, complete, fully assembled, and tested kits (with servo and hardware) are available at iascaled.com.

Michael Petersen