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Cake day: April 13th, 2024

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  • I wish people (especially journalists) would get it through their skulls already:

    • Vehicles don’t communicate with satellites.
    • GNSS (like GPS, GLONASS, Galileo, or BeiDou) do not use two way communication.
    • The satellite can therefore not know the position of a GNSS receiver.
    • Instead the satellites send timestamps and their positions, the receiver uses that information to calculate its own position. If the system with the receiver needs to report its position to someone they typically use some form of terrestrial communication, like mobile phone networks.

    With that knowledge the comment by /u/imetators@lemmy.dbzer0.com makes a lot more sense than whatever the article is trying to imply about satellite failures.











  • It may act on the whole market, but it doesn’t have the same impact on every OEM.

    It’s a bigger issue for Valve than the console competition, who have established supply chains potentially with fixed prices for certain terms or at least more significant volume discounts, and proprietary compatibility hurdles binding their customers, so they can sell hardware at a loss if they want to.

    If Valve sells the computers at a loss they run the risk of people buying them for other uses, without generating corresponding Steam profits.



  • Kazumara@discuss.tchncs.detolinuxmemes@lemmy.worldmeme
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    1 month ago

    I reckon it works a bit like Unix.

    But seriously unless you’re a systems engineer with 15 years of experience you probably don’t know how any popular OS works (note, I’m not either, I don’t know shit). They are huge beasts with astonishing complexity.

    I spent a semester writing a microkernel OS with three other students. We got the init sequence working, memory management working, a shell accessible over UART, FAT32 on an SD card, a little bit of network, and a minimal HTTP server for the demo. And this was considered a big accomplishment worthy of top grades.

    And that’s only the scratching the surface of what makes an OS, just think of all the other things you need. Journaling filesystems, user and rights management, hundreds of drivers for devices and buses* full networking support, with dual stack, DNS, tunneling, wifi, then things like hibernation, sleep, power management in general, container and virtualization support, NUMA support, DMA support, graphical output, clocks and time sync, cryptography primitives and TPM support, etc etc

    *I did USB only for mass storage once, that also took me a semester, and I bet PCIe is much harder.