Optically switched control panel?

[Mike Loewen]

    A member of another list thinks he remembers a large computer with a 
control/maintenance panel that used optical switches to set and clear 
register bits.  The operator would place a finger in a hole/depression, 
interrupting a light beam to a photosensor, toggling a flip-flop.

    Did such a system exist, or is this just wishful thinking?


Mike Loewen				mloewen at cpumagic.scol.pa.us
Old Technology	http://sturgeon.css.psu.edu/~mloewen/Oldtech/