I love how LEDs can flicker extremely quickly. Back in the early 90s when I was working on HIPPI[1] network hardware, our crossbar switch had a 7-segment LED di

I love how LEDs can flicker extremely quickly. Back in the early 90s when I was working on HIPPI[1] network hardware, our crossbar switch had a 7-segment LED display on each port that indicated the current destination. These LEDs were actually updated synchronously. which worked surprisingly well as a debug tool. You could send to multiple ports and see the port numbers blended on top of each other in proportion to each ports data rate. Years later, it seems blinkenlights[2] went out of fashion and everybody started quantizing blink rates to 1s or 0.5s max. /sigh/ it's throwing out useful information for no good reason. [1] https://en.wikipedia.org/wiki/HIPPI https://en.wikipedia.org/wiki/HIPPI [2] http://www.catb.org/jargon/html/B/blinkenlights.html http://www.catb.org/jargon/html/B/blinkenlights.html