If you aren’t old enough to remember when computers had front panels, as [Patrick Jackson] found out after he built a replica Altair 8800, their operation can be a bit inscrutable. After figu… ...

In particular, the sensor (s) may be configured to measure a relative location, distance, presence, movements and/or gestures of one or more users of the computer system. Thus, the systems and methods ...

By monitoring oxygen levels, the sensor provides a means of measuring fuel mixture. The O2 sensor lets the computer know if the fuel mix is burning rich (not enough oxygen) or lean (too much oxygen).

After cleaning the panel and fixing most keyswitches, the original poster noted that actually running it would require "1,500lbs of mainframe"—the rest of the computer system that's missing.

Wahoo Fitness’ new Elemnt Ace bike computer uses an added air pressure sensor to measure the effect of wind speeds on a cyclist’s performance.