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Cake day: July 2nd, 2023

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  • Almost, but close enough. It had hardware to draw background solid blocks, two one-pixel dots and two sprites that had width but interestingly no height. The background was repeated or mirrored by hardware registers so if you wanted different patterns on left and right half of the screen, you need to switch the correct values at the right time at every line. Any positing of graphics would be in X position only so you’d have to do it by the line when the raster hit it. It had no interrupts except that you could forcibly wait for next frame to render and then you keep track of the clock cycles to render each line. And it has 128 bytes of RAM, less than the number of characters in this comment, while games were 1,2 or 4 KB on ROM cartridges, needless to say very efficiently coded directly in 6502 machine code. Oh, and the sound chip had no chromatic division of frequencies but weird intervals that aren’t even close to any scale we know. Yet programmers managed to create great games on the platform. It’s absolutely crazy.










  • For anybody else curious;

    Voyager 1 uses hydrazine (N₂H₄) as fuel for its small attitude control thrusters. Hydrazine is a hypergolic monopropellant, meaning it doesn’t require an external oxidizer—it decomposes exothermically upon contact with a catalyst, producing gas to generate thrust.

    The thrusters are not used for propulsion, but rather to rotate and stabilize the spacecraft so that its antenna remains pointed toward Earth and its instruments can be properly oriented. Fuel consumption is extremely low—only a few grams per year—and Voyager 1 still has some hydrazine left, although it’s running low. Once the hydrazine is depleted, the spacecraft will no longer be able to control its orientation, which means communication with Earth will cease.

    The Voyager spacecraft have no engines for linear acceleration; instead, they follow the trajectory and speed gained from gravity assists during planetary flybys in the solar system.



  • If you pick a ZigBee device and don’t try to power a refrigerator or a washing machine with it, it probably doesn’t matter much. Just get some reliable brand, Sonoff, IKEA, something, for wall powered stuff. Battery sensors are fine OEM from AliExpress. I’d advice against anything WiFi that requires a cloud connection, as most of them do, but that is my personal preference.










  • whaleross@lemmy.worldtoAsk Me Anything@lemmy.caI am a drifter, AMA
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    6 days ago

    A friend helping out in an emergency for a few days, weeks or mayyybe months is one thing. Systematically living on somebody else’s bill only to save your own expenses is something else.

    You’re of course free to do what you want, but don’t be surprised if your friends get tired of you.