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20 Oct, 4 tweets, 1 min read
this ought to take a while to print. Image
not too shabby Image
that took 7 hours to print ๐Ÿ˜‚
and here it is: the slide-lock hard drive sled for the IBM PS/2 model 50Z. Image

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23 Oct
this Tesla SUV ran into a traffic barrier at 70mph while on Autopilot. how could this happen? there are 3 major contributing causes, and they're *fascinating* Image
before we dig into the causes, let's set the scene first: the southbound 101 freeway at the intersection of 85. there is a left exit ramp so commuter-lane traffic can get to the 85 southbound commuter lane. Image
the Tesla was in the commuter lane, then departed that lane and headed into the strip of roadway (called the "gore") leading up to the median, crashing into the barrier. Image
Read 35 tweets
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18 Oct
in 1990, a tiny company nobody had heard of, Cadtrak, sued Commodore for patent infringement and won. Their company CEO bragged that he put Commodore out of business! Commodore's downfall took more than just that, but who was Cadtrak, and what was their patent? ๐Ÿงต
first, the patent. 4,197,590, filed in 1978. it described a method for drawing a cursor and then erasing it again without having to store a copy of the background. this was a simple XOR operation.
you see, with an XOR, a '1' bit in the cursor caused whatever graphics were on the screen to get inverted. XOR it again with the same bit, and it gets inverted back to the original state. a '0' bit made no change. this saves RAM, since you don't need to keep a backup image.
Read 25 tweets
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17 Oct
i'm testing more vacuum tubes this afternoon. as you do...
don't use soap or water to clean a tube, the numbers will come right off. instead I just gently wipe it with a cloth.
first step is to find the tube in the little roll chart built into the unit.
Read 10 tweets
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17 Oct
welp, i finally broke down and bought my first 3d printer! this one is an Ender 3. ๐Ÿงต
it comes in a flat pack, this is basically like the Ikea bookshelf of 3D printers.
there are two layers of parts in this box!
Read 18 tweets
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9 Oct
all right, this is a new one. a EULA on...fruit?!

'the recipient of the produce contained in this package agrees not to propagate or reproduce any portion of this produce, including "but not limited to" seeds, stems, tissue, and fruit.' Image
some folks think I faked it. it's real. it's even printed in French on the other side ImageImageImage
as for the fruit itself? not that great, they're just too sugary for my tastes. but hey, i'd never had them before.
Read 7 tweets
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7 Oct
looking through some old photos, i found some neat pictures of IC chips. this one is a 7805 regulator. Image
8755 16K EPROM + GPIO Image
Intel 8080 CPU.

(this one is from National, i think they were a mask licensee) Image
Read 12 tweets

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