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  2. Power-on self-test - Wikipedia

    en.wikipedia.org/wiki/Power-on_self-test

    Almost all Amiga models present the same color sequence when turned on: black screen, dark gray, light gray color screens filling all monitor screen in a rapid sequence (Amigas usually take between 2 and 3 seconds to turn on and boot). [9]

  3. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    In diffused lens LEDs, this circuit is visible as a small black dot. Most flashing LEDs emit light of one color, but more sophisticated devices can flash between multiple colors and even fade through a color sequence using RGB color mixing. Flashing SMD LEDs in the 0805 and other size formats have been available since early 2019. Flickering

  4. Notification LED - Wikipedia

    en.wikipedia.org/wiki/Notification_LED

    A notification LED on a smartphone. A Notification LED is a small RGB or monochrome LED light usually present on the front-facing screen bezel (display side) of smartphones and feature phones whose purpose is to blink or pulse to notify the phone user of missed calls, incoming SMS messages, notifications from other apps, low battery warning, etc., and optionally to facilitate locating the ...

  5. Blinkenlights - Wikipedia

    en.wikipedia.org/wiki/Blinkenlights

    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 Conway's Game of Life patterns. [1] The two CPU load monitors on the front of BeBoxes were also called "blinkenlights". [3]

  6. Flashlight - Wikipedia

    en.wikipedia.org/wiki/Flashlight

    Formerly, the light source typically was a miniature incandescent light bulb, but these have been displaced by light-emitting diodes (LEDs) since the early 2000s. A typical flashlight consists of the light source mounted in a reflector, a transparent cover (sometimes combined with a lens ) to protect the light source and reflector, a battery ...

  7. Mechanically powered flashlight - Wikipedia

    en.wikipedia.org/wiki/Mechanically_powered...

    The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...

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  9. Flashing - Wikipedia

    en.wikipedia.org/wiki/Flashing

    Flashing (weatherproofing), construction material used to prevent the passage of water around objects; Flash evaporation, causing evaporation by lowering a fluid's pressure below its vapour pressure; Flashing light, such as a light bulb or computer's cursor