The PDP-7's light pen, and devices built on the PDP-7 for this cabinet, drawn and driven by Forth.
- Light Pen Test Type 370 light pen test, DEC-4-45-M, C. Stein, 1964: sensitivity, follow and field of view. Page 6 is reconstructed.
- Ultimate Machine Minsky's Ultimate Machine, the box whose only function is to switch itself off: device 56, drawn on the 340 by Forth. Click the switch with the light pen.
- DataHand A hand tracker as PDP-7 device 57: each bone a 3D turtle move (yaw, pitch, length), drawn by Forth on the 340. Allow the camera and hold up your hand.
- Ultimate Hand Minsky's Ultimate Machine, and you are its hand. Show the camera your hand, then touch the switch.
- Turing Machine Turing machines on device 54, the tape drawn by the 342 character generator: busy beavers, a binary counter, and Minsky's universal machine, compiled from TM-Forth.