Large files on this site are password protected because automated downloaders have been a significant drain on this system's resources.
To see the blinkenlichts display video, please use the autorization sequence
For the technically minded ...
This setup was created by linking an HP-9915B to two HP 59306A Relay Actuators. Each 59306A has 6 relays that can switch 28 Vdc or 115 Vac at 0.5 amps. A separate string of decoration lights was connected to each relay. The decoration lights are set up to remain always on, so we can turn them on or off via the appropriate 59306A relay. A total of 12 strings of lights were connected to the two 59306As, one per relay.
A program running on the 9915B turns each relay on, or off randonly. At the same time the 9915B display LEDs are used to display the sequence number (in binary).
