@tubetime is it not... shorted through the calipers, when held like that?

well, you probably only did it for a moment

@tubetime 🙀🤯

@tubetime I was just wondering about this a couple of days ago!

@tubetime amazing. I spent a little time on that myself a while back

@tubetime What a nice rabbit hole! I found that you can download some Mainframe music as mp3 from here for free.
http://mainframe-music.info/mainframe_music_mp3s.html

@tubetime well, here goes nothing

to get the Amiga to work with high density disks, the Commodore engineers took a little short cut and just spin the drive at half the normal RPM (150 instead of 300). this keeps the data rate the same, allowing the custom chip to remain unchanged.

@tubetime holy shit that sounds really cool I don't even own an Amiga tho...

@tubetime the solution is to get more breadboards. You never have enough for a computer project.

@tubetime breadplex

@tubetime I expect the Army received many notes from lonely radar technicians asking for Ms. "Jot down the dope" contact info. 🤷‍♂️

@tubetime

RETVRN

@tubetime I wish there was stuff like this near me. Looks like it would be so much fun.

@tubetime Added the upcoming ones to my calendar in hopes of finally checking this out sometime.

(2)

there's something weird about the markings on the bottom of the chip

@tubetime this is close to @NanoRaptor level shitposting too

@tubetime Moto undoubtably made custom chips for specific customers and wouldn’t have published docs on them. Perhaps there might be public info on part number ranges that they used for customer chips, but perhaps not. Could be interesting to reverse engineer.

@tubetime a variant of the 4055? :ablobthinkingeyes:

i cracked it open and this is what the die looks like. some sort of memory array, it could be SRAM but who knows.

@tubetime idk what it is but it looks oddly cute and i just don't know why

silly little goober of a chip uwu

@tubetime Backing data out of a 'display a/d converter' like the ICL7106?

@tubetime An oddball thing to use this is to read data from video signals that are either generated by a camera pointing precisely at a 7 segment display, or one of those early "consumer" OSD chips that use 7 segments.

@tubetime sometimes that's all you need to make one

@tubetime neat, I've always wanted to test if I could hear 1MHZ :blobcatgooglyfingerguns:

seriously though I bet that's very useful for quite a lot of different projects ranging from reviving old electronics to hardware mod overclocking to pleasantly gimmicky synthesizers

@tubetime
..but how do you..?
(reads link)
Never mind. Neat! 👍

@tubetime
Small note on the trimpot: Mouser does stock the Spark Fun trimpot. Mouser part number is 474-COM-09806.

@tubetime I love his video/editing style. I'm far from an audiophile or a collector and I still want one.

Just a great collection of facts and engineering explanation.

@tubetime It's a warning that it's poisonous, and predators shouldn't attempt to eat it.

@tubetime It has a resistance value of 3.1kOhms +/-10%

On a more serious approach, it can be test indicators. (kind of "QA Passed")

@tubetime

It's positive for COVID?

@tubetime Signetics, I would assume. Although not the most frequent logo

https://en.m.wikipedia.org/wiki/Signetics

@tubetime seems to be from Solidev, it's a "Triple 3-input NAND gate":

https://www.bg-electronics.de/datenblaetter/Schaltkreise/CM4000serie.pdf

@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 ...

@tubetime I'm struggling to see how they can make it more expensive... (I've been tempted to learn how to use it but could never afford a license, I just use KiCAD for my projects)

I guess they could just be absurdly annoying and make it so certain features only work with renesas parts

@tubetime for the tourists here would you mind explaining why this is terrible? Asking for a friend!

@tubetime So what does a hobbiest license cost for the complete Cadence stack? They don't return my phone calls! 🙂

@tubetime have you ever seen a moon? You will. And the company that will bring it to you? AT&T

@tubetime

Società Generale Semiconduttori

https://it.wikipedia.org/wiki/Societ%C3%A0_Generale_Semiconduttori

Now that is a great name for a chip company.

@tubetime https://www.inc.com/magazine/19851101/8957.html

@tubetime I swear to $deity some of these chip manufacturer names read like white label Chinese sellers on Amazon. XD

@tubetime "Please don't use if you're allergic to Zytrex or one of its ingredients. Please reach out to your physician if you have questions, and remember to use logic gates responsibly."

@tubetime "Quality Semiconductor", now owned by IDT.

@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

I wonder if this is the same Quality Semiconductor. too bad about the quality of the chip marking