I believe it's this: "SPOC, a navigation monitoring computer used by NASA in a 1983 mission, was a modification of a commercial computer called GRiD Compass, p

I believe it's this: "SPOC, a navigation monitoring computer used by NASA in a 1983 mission, was a modification of a commercial computer called GRiD Compass, produced by GRiD Systems Corporation. ... SPOC automatically computes position, orbital paths, communication locations, etc. Some of the modifications were adapted for commercial applications." http://spinoff.nasa.gov/spinoff/database/spinoffDetail.php?this=/spinoff//hdqs/HDQS-SO-130 http://spinoff.nasa.gov/spinoff/database/spinoffDetail.php?t... Here's an Adafruit blog post with pictures of the hardware: https://blog.adafruit.com/2016/09/03/grids-compass-os-bootable-nasa-spoc-software-on-your-pc/ https://blog.adafruit.com/2016/09/03/grids-compass-os-bootab...