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31 Dec 21, 4 tweets, 1 min read
maybe i should do a Therac-25 deep dive, but there are entire books written about it...
i remember reading about it in a book, Fatal Defect - Chasing Killer Computer Bugs. but there are inaccuracies and simplifications.
there's also this Reddit thread: reddit.com/r/programming/…
(the VT link is dead but archive.org has it)
don't be this programmer. sometimes it is better to quit and leave a toxic situation than to live the rest of your life with this sort of guilt. Image

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1 Jan
Tube Time: a 2021 retrospective 🧵
(and stuff you might have missed!) Image
i started off with this nice video clip of an old-school flashing lamp (like the red-tipped ones used to flash christmas lights)
then tried to resurrect a very corroded pinball circuit board.
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31 Dec 21
there's something unique about this potentiometer. Image
it has three large ball bearings in the back, but what for? (read on!) Image
the three ball bearings form a planetary "gear" reduction, turning this into a 10-turn potentiometer!
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27 Dec 21
fantastic aesthetic of the most accurate pendulum clocks ever built.
this 1920s clock technology could be accurate to within 1 second per year, and measurements in the 1980s confirmed that at least one such clock was accurate to within a tenth of a second per year.
here's the 1984 paper measuring the accuracy of such a clock. leapsecond.com/pend/pdf/1986-…
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22 Dec 21
these little guys are 0805 surface mount devices, but you'll never guess what they are! hint: they're not resistors!
not fuses, not capacitors, not diodes, not LEDs, not antennas...
it's in stock at Mouser. no guesses?
Read 9 tweets
Tube☃Time Profile picture
21 Dec 21
today's project is to fix this old Seagate ST-412 hard drive. 10MB, full height, and really loud! Image
here's a problem: the positioner stepper seems to move around randomly on power up. it's supposed to wait until the rpm goes nominal before moving. could be an issue with one of the motor phases.
looks like the stepper is controlled from an MCU. but there's some electronics in between i should check. Image
Read 37 tweets
Tube☃Time Profile picture
4 Dec 21
check this out! it's an accelerator card that turns your 8088 PC or XT into a 286. let's try and get it running... 🧵 Image
hmm, there's some damage to the sockets Image
the card is an Orchid Tiny Turbo 286. Image
Read 52 tweets

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