there are 2.55 centimeters per 8-bit inch.
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there are 2.55 centimeters per 8-bit inch.
Tube🌱Time
Renesas just bought Altium. lol, joke's on them, i switched to KiCAD years ago
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Niall in Raglan :laserkiwi:
@tubetime for the tourists here would you mind explaining why this is terrible? Asking for a friend!
Darryl Ramm
@tubetime So what does a hobbiest license cost for the complete Cadence stack? They don't return my phone calls! 🙂
Eric Vitiello
@tubetime have you ever seen a moon? You will. And the company that will bring it to you? AT&T
Darryl Ramm
Società Generale Semiconduttori https://it.wikipedia.org/wiki/Societ%C3%A0_Generale_Semiconduttori Now that is a great name for a chip company.
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Calyo Delphi
@tubetime I swear to $deity some of these chip manufacturer names read like white label Chinese sellers on Amazon. XD
Tube🌱Time
another day, another unfamiliar chip manufacturer. any ideas? I'm thinking it's a character from Star Trek.
Calyo Delphi
@tubetime I just searched the first line on DuckDuckGo and came up with Quality Semi, specifically a 1-of-8 decoder, by the looks of it? Digikey seems to have a similar product in SOIC-8 https://www.digikey.com/en/products/detail/rochester-electronics-llc/QS74FCT138CTSO/10499614
Tube🌱Time
I wonder if this is the same Quality Semiconductor. too bad about the quality of the chip marking
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異世界貓叔叔ひろしさん🐈
@tubetime Might be SEMI PROCESSES, INC. https://opencorporates.com/companies/us_ca/0827527
echopapa ☑️
Semi Processes Inc. https://www.questcomp.com/part/4/sp74hc113n/384845007 At this page there is also a data sheet.
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Michael Katzmann🐈
@tubetime Sescosem was formed during the merger of Thomson-Brandt and CSF in 1968. Thomson's SESCO division was merged with CSF's COSEM division to form SESCOSEM. Sescosem's products were never a big commercial success, but the technology was eventually absorbed in the subsequent mergers that created STMicroelectronics.
Dantali0n :arch: :i3:
@tubetime I have a bunch of these in my parts bin they are quite common in the Netherlands (Europe). Probably don't exist anymore as I have only ever seen 74LS never any CMOS variants.
Tube🌱Time
ever need to monitor an 8-bit bus on a breadboard? I'm working on a better way. the bottom board has a TTL transparent latch and 8 LEDs. the top board is special... 🧵
Tube🌱Time
this little guy turns the 8-bit value into hex! it's also configurable: you can flip the digits upside down for when you plug it into the left side of your breadboard. it can also trigger and latch data on the rising or falling edge of the optional trigger pulse, it can be level or edge sensitive, and you can set it to "single shot" capture a single value.
Tube🌱Time
some great pixel art from my brother. this was displayed with a genuine IBM CGA card (really!)
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rhempel
@tubetime This is just subtle enough to make you double check your math and make sure you have it oriented in the correct polarity. Unless it's a bit too subtle and then you f#@k around and find out how much energy is in that misapplied capacitor. We used to say "just put a BFC across the output of that lumpy 48v full wave rectified transformer and you'll be fine"
Mike Carden
@tubetime being an electronics apprentice in the 1980s was sometimes a Trial By Fire. Charging a big High Voltage electrolytic cap, wrapping its leads around it and tossing it to the apprentice was a thing. Ow-diddly-ow. Then connecting a tantalum cap backwards across the output of a DC supply and switching it on just as the apprentice walks up… Good Times?
Tube🌱Time
cross section of a high power electric car charging cable. the electric current is so high that the copper wires would overheat, but coolant flows through small tubes in the center of each wire.
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0xC0DEC0DE07E8
@tubetime holy crap, is all of this so that it can support an essentially infinite/full duty cycle? I mean I’ve lugged 4160V cables and they don’t need this (I mean, yes, they’re AC and high voltage specifically to reduce current and the resultant heat from I-squared R losses, but still)
Tube🌱Time
here's an interesting card that came in for attempted repair: a Hercules MC1024 Micro Channel video card. it uses the weird Micro Channel bus, and it is based around the TIGA graphics processor. and it appears to from the computer have been untimely ripp'd.
Tube🌱Time
this is how KiCad has been marking pin 1 on a lot of devices. yes, it's a silkscreen line that is slightly longer on one side than the other. because silkscreen never flakes away or gets obscured by a via or clipped by a fab vendor for being too close to a solder mask opening...
Tube🌱Time
in my own libraries, i like to use multiple markings for pin 1. here i have a semicircle at one end of the chip along with a circle right next to pin 1.
Harvey Sandstrom
@tubetime Long overdue. I had no idea they were following a standard, its a terrible standard. I've reversed SWD connections a half dozen times because a coworker decided to orient the connector unintuitively and made no attempt to augment the default terrible pin one marker.
Tube🌱Time
I got nerd sniped into helping reverse engineer this card. it's a rare beast -- the interface card for an IBM 5364. this midrange System/36 minicomputer was paired with a PC for bootstrapping and control. the interface between the two is a 62-pin cable and a special card that goes in the PC. these often get separated and lost.
Tube🌱Time
i just love it how STEP models for electronic components are all locked down now 🙄 and also obviously wrong like this "7-segment" display.
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Tube🌱Time
found an unusual bare PC board on my lab bench... 🧵
Tube🌱Time
the scan was a little tricky to stitch together since the board is longer than my scanner 😅
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Tube🌱Time
now streaming PCB reverse engineering! check it out. www.twitch.tv/tubetimeus
Max Wainwright
@tubetime You can just drag a line through all the capacitors. Watching that copy/paste operation w as painful :-)
Tube🌱Time
doing research on refurbishing old hard drives, and i learned that the platters are typically coated with a PFPE-based oil.
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just_one_bear
@tubetime This means I shouldn't use them as a serving dish! Y'know, because the big spindle hole isn't enough deterrent :) |
@tubetime Shouldn't that be 2.56?
@tubetime @adistuder @brainwagon If the units are discrete (increments of 0.01 cm) then there are 256 possible values of length from 0.00 cm up to 2.55 cm. 2.56 cm would be 0x0100.
If the units are continuous (not integers) then it would range from 0.00 ≤ length < 2.56, so length up to but not including 2.56 cm. In this case, answering "how many mm are there in an 8-bit inch" is harder because there are infinitesimally less than 256, and also sort of inaccurate because that's not really 8 bits.
@tubetime am dealing with label printers at work that have 203dpi or 8dpmm ... but actually 7.99dpmm and it does my head in ... but given each label is 66mm and the error for finding the edge for the next is 0.5-2.0mm I think it is unlikely to matter much over that length ...