blink = B = blit

blinkenlights /blink'*n-li:tz/ n.

[common] Front-panel diagnostic lights on a computer, esp. a dinosaur. Now that dinosaurs are rare, this term usually refers to status lights on a modem, network hub, or the like.

This term derives from the last word of the famous blackletter-Gothic sign in mangled pseudo-German that once graced about half the computer rooms in the English-speaking world. One version ran in its entirety as follows:


Das computermachine ist nicht fuer gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitzensparken. Ist nicht fuer gewerken bei das dumpkopfen. Das rubbernecken sichtseeren keepen das cotten-pickenen hans in das pockets muss; relaxen und watchen das blinkenlichten.

This silliness dates back at least as far as 1959 at Stanford University and had already gone international by the early 1960s, when it was reported at London University's ATLAS computing site. There are several variants of it in circulation, some of which actually do end with the word `blinkenlights'.

In an amusing example of turnabout-is-fair-play, German hackers have developed their own versions of the blinkenlights poster in fractured English, one of which is reproduced here:


This room is fullfilled mit special electronische equippment. Fingergrabbing and pressing the cnoeppkes from the computers is allowed for die experts only! So all the "lefthanders" stay away and do not disturben the brainstorming von here working intelligencies. Otherwise you will be out thrown and kicked anderswhere! Also: please keep still and only watchen astaunished the blinkenlights.

See also geef.

Old-time hackers sometimes get nostalgic for blinkenlights because they were so much more fun to look at than a blank panel. Sadly, very few computers still have them (the three LEDs on a PC keyboard certainly don't count). The obvious reasons (cost of wiring, cost of front-panel cutouts, almost nobody needs or wants to interpret machine-register states on the fly anymore) are only part of the story. Another part of it is that radio-frequency leakage from the lamp wiring was beginning to be a problem as far back as transistor machines. But the most fundamental fact is that there are very few signals slow enough to blink an LED these days! With slow CPUs, you could watch the bus register or instruction counter tick, but at 33/66/150MHz it's all a blur.

Despite this, a couple of relatively recent computer designs of note have featured programmable blinkenlights that were added just because they looked cool. The Connection Machine, a 65,536-processor parallel computer designed in the mid-1980s, was a black cube with one side covered with a grid of red blinkenlights; the sales demo had them evolving life patterns. A few years later the ill-fated BeBox (a personal computer designed to run the BeOS operating system) featured twin rows of blinkenlights on the case front. When Be, Inc. decided to get out of the hardware business in 1996 and instead ported their OS to the PowerPC and later to the Intel architecture, many users severly suffered from the absence of their beloved blinkenlights. Before long an external version of the blinkenlights driven by a PC serial port became available; there is some sort of plot symmetry in the fact that it was assembled by a German.

Finally, a version updated for the Internet has been seen on


Das Internet is nicht fuer gefingerclicken und giffengrabben. Ist easy droppenpacket der routers und overloaden der backbone mit der spammen und der me-tooen. Ist nicht fuer gewerken bei das dumpkopfen. Das mausklicken sichtseeren keepen das bandwit-spewin hans in das pockets muss; relaxen und watchen das cursorblinken.

This newest version partly reflects reports that the word `blinkenlights' is (in 1999) undergoing something of a revival in usage, but applied to networking equipment. The transmit and receive lights on routers, activity lights on switches and hubs, and other network equipment often blink in visually pleasing and seemingly coordinated ways. Although this is different in some ways from register readings, a tall stack of Cisco equipment or a 19-inch rack of ISDN terminals can provoke a similar feeling of hypnotic awe, especially in a darkened network operations center or server room.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

Blinkenlights (name inspired by the jargon file entry noded above) also is the name of a light installment made by german Chaos Computer Club (CCC) at the Haus des Lehrers (House of the teacher) in Berlin, Alexanderplatz.

The basic idea was creating world's biggest Pong game to celebrate the 20th anniversity of the CCC. The house was empty due to renovation works, so a 8x18 pixels monochrome dot matrix was created by using 144 floodlights to illuminate the windows in the upper eight stories.
You can call the game using your cellphone and play Pong against the house or against a human opponent via dial tones.

While no one plays, blinkenlights displays random animations including ALL YOUR BASE ARE BELONG TO US, the CCC logo and many more.
As a third feature, you can produce your own animations using free software from, thus creating loveletters you can display on the house by calling a phone number and enter an activation code, so your loved one will see it while you are wandering through nightly Berlin.

Blinkenlights will stay at least till the end of February 2002.

Update March 2002: It's gone now, sadly.

Some technical facts about blinkenlights:

Die Datenschleuder Issue #76, Fall 2001 (CCC member magazine)

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