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  2. ZX Spectrum - Wikipedia

    en.wikipedia.org/wiki/ZX_Spectrum

    Ultimately the Spectrum was released as seven different models, ranging from the entry level with 16 KB RAM released in 1982 to the ZX Spectrum +3 with 128 KB RAM and built-in floppy disk drive in 1987. Throughout its life, the machine primarily competed with the Commodore 64, BBC Micro, Dragon 32, and the Amstrad CPC range. Over 24,000 ...

  3. Railway signals in Germany - Wikipedia

    en.wikipedia.org/wiki/Railway_signals_in_Germany

    Third arms were removed; in 1948, the green light of the lower arm was changed to yellow. This system is still in use today. There were also distant signals (German: Vorsignale) to advise the driver as to what aspect the next main signal showed, so that they could slow or stop their train in time if necessary.

  4. Z-Library - Wikipedia

    en.wikipedia.org/wiki/Z-Library

    Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has since expanded dramatically. [6] [7]

  5. Safe Period: How to Time Sex to Prevent Pregnancy - Healthline

    www.healthline.com/health/womens-health/safe-period

    An egg is viable between 12 and 24 hours after it leaves the ovary. Sperm can stay alive up to 5 days after having sex. Implantation of an egg, which happens after fertilization, usually takes ...

  6. IBM Z - Wikipedia

    en.wikipedia.org/wiki/IBM_Z

    It is distinguished from the LinuxONE model by the blue accents on the doors. A pair of IBM mainframes. On the left is the IBM z13 (while the naming was changed, the z13 line had a zSystems label on doors). On the right is the IBM LinuxONE Rockhopper. IBM Z [1] is a family name used by IBM for all of its z/Architecture mainframe computers .

  7. Berkeley Timesharing System - Wikipedia

    en.wikipedia.org/wiki/Berkeley_Timesharing_System

    The Berkeley Timesharing System was a pioneering time-sharing operating system implemented between 1964 and 1967 at the University of California, Berkeley. It was designed as part of Project Genie and marketed by Scientific Data Systems for the SDS 940 computer system. It was the first commercial time-sharing which allowed general-purpose user ...

  8. ß - Wikipedia

    en.wikipedia.org/wiki/ß

    In German orthography, the letter ß, called Eszett ( IPA: [ɛsˈtsɛt]) or scharfes S ( IPA: [ˌʃaʁfəs ˈʔɛs], "sharp S"), represents the / s / phoneme in Standard German when following long vowels and diphthongs. The letter-name Eszett combines the names of the letters of s ( Es) and z ( Zett) in German.

  9. Comparison of time-tracking software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_time...

    This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Comparison of time-tracking software ...

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