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I was reading about how a Raspberry Pi (or is it Arduino?) can be configured to work as an oscilloscope that can interface into a regular computer, thereby using the computer's ... well ... computer to process the signal. I figure that if this is something that a hacker could do, certainly someone could make a COTS product. Any ideas?
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Don't know if pico scope is what you're looking for but the micro hooks up to the pi. Let me know I've got one of
Technician
1. A person that fixes stuff you can't.
2. One who does precision guesswork based on unreliable data provided by those of questionable knowledge.
JaxCoder.com
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Check out https://www.adafruit.com/product/2053 I don't know that particular product but their goods are generally of quality.
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I think Mike mentioned Pico Scope, I have used them, they are quite good, but I miss the clicky switched dials of a real scope! Pico Scope, the Raspberry Pi versions can work but I think having to hook up a screen through the HDMI is a little odd! 
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Bitscope Micro
www.bitscope.com
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Yep that's it. I'm on the road and couldn't quite remember the name. A friend gave me one and I don't use it so am looking for a home for it.
Technician
1. A person that fixes stuff you can't.
2. One who does precision guesswork based on unreliable data provided by those of questionable knowledge.
JaxCoder.com
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As others have noted, there are tons of "USB Scopes" out there, from the ultra-cheap (and limited in numerous ways) to the very, very expensive. In fact, virtually all of today's "standalone" scopes are not much more than a specialize sampling interface connected to a custom embedded system. Usually that system runs anything from some embedded (or not) form of Windows, Android, Linux, VxWorks, or even a custom or customized real-time OS.
If you go on Ebay or Amazon, and search for "USB Oscilloscope", you'll find a ton of options.
If you google the same - again, you'll find plenty. Some of the more interesting ones are cheap Chinese things that don't cost a lot, but have a decent amount of bandwidth for hobbyist use - anywhere from 20-100 MHz on a single channel (usually half that on dual channels, if that is offered). Most of these also have a built-in signal generator, and an 8 or 16 input logic analyzer input. Most of the time the software is Windows-based, but some of them have Linux open-source ports available too.
The downside of these cheap scopes is that the front-end - that is, the thing that samples and such - can leave a bit to be desired. If all you want is to check a basic signal level or maybe the frequency of a bit train or something, they are perfect for that. But if you are trying to figure out some kind of noise issue, the scope itself might have millivolts of noise on the output as-is, which is no good (so if you are doing serious work, pay for a serious scope).
Other items you'll see out there are all manner of USB Logic Analyzers, which are basically multi-channel oscilloscopes designed to measure and show a set of digital signals, within a certain bandwidth. One well known (and expensive) set of models are made by Saleae - they also tend to be the most cloned set, as well (mainly because their software is so good). So you'll find their top-end models, plus counterfeits (some of them will be marketed as particular embedded dev systems - because really that's all the Saleae scope is, done up in a fancy case).
Finally - if you continue to dig - you can find tons of articles, blog posts, Arduino forum musings, Instructables, and other instances of people showing how to build such scopes; everything from display on an LCD to dumping the data over USB and such can be found covered, using virtually every kind of embedded processor you've ever seen. And if you dig really far down, you'll find old text files on how to build such scopes using a PC, it's parallel port, and custom DOS software (back in the day, there were commercial scope offerings that worked in the same manner - just with a really good front-end).
Now you might be wondering what I mean by "front-end" - by that I mean the part that the scope probes plug into, and which does the actual sampling and storage of the data. It might be completely in software and just be a couple of analog input pins on a microcontroller. Or it can get very complex, very quickly. The better the front end, the faster things will be (more bandwidth per channel is always better), the less noise there will be, the more samples that can be taken, etc. You can find a lot of material out there on how to design such systems. When it comes to digital sampling and such, you also have to figure out if you want to use an external clock driving a ring-buffer of memory as fast as possible (then somehow read that memory using whatever you have for a controller), or if you want to implement something similar in software (there are a ton of ways to speed up a single channel system for a standard Arduino to get it to sample way, way quicker than the naive analog read command allows for).
It's actually a very complex topic, but one that also has a very long history (before electronic oscilloscopes existed, there were electric and electro-mechanical - and even wholly mechanical - systems developed to measure and visualize sound; they were all lumped under the term "oscillographs" - they were mainly a method to either directly visualize, using light or another means, the vibrations of sound, and/or photograph them (early sound recording on film and glass plates were an early practical use of such techniques).
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Herself had a lazy morning - she was still in pajamas at noon - so I thought I'd do a Full English Breakfast, and we'd have that as Brunch.
So...
Sausages.
Bacon.
Black Pudding.
Hash Browns.
Baked Beans.
Tomatoes cooked in juice.
Mushrooms*.
Fried egg.
Toast.
Coffee / Tea
*burp*
I'm having difficulty moving ... but that's good. Not something to have often, maybe twice a year at most - but damn good.
* I tried them Sous Vide** for the first time, with butter, thyme, and soy sauce, and I have to say they were excellent. Firm, but cooked and tasty with added umami flavour. Definitely will try again.
** As were the beans and tomatoes - not only does it make life a load easier and give you moist food, but it reduces the number of pans you have to wash up by three as well. Bonus!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
modified 24-Aug-19 9:29am.
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Two lots of hash browns? No wonder you're feeling stuffed!
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What can I say? I like hash browns!
Fixed... 
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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I generally eat that sort of breakfast when staying in hotels in the UK: some are good, some are dammed good, and occasionally I make real pig of myself.
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I learned not to expect too much from hotel breakfasts - the odd one is brilliant, but the rest are cooked hours in advance (and deep fried where vaguely possible) which doesn't give the best result. Grill those sausages! And the bacon! Cook to order and serve hot (with hot toast, damnit!) - we don't mind waiting 20 minutes, honest.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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I take it you prefixed that with cereal / muesli, and a glass of freshly-juiced orange?
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That's not an E (for English) breakfast; it's an F breakfast.
I wanna be a eunuchs developer! Pass me a bread knife!
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I prefer a good old fashioned full American breakfast:
Coffee, bacon and guns.
With wheat toast.
When I was growin' up, I was the smartest kid I knew. Maybe that was just because I didn't know that many kids. All I know is now I feel the opposite.
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I am going to a party tonight, and there is every possibility that I shall have a drink or two*, so I have already removed from the freezer and placed in the fridge the necessary ingredients for the same, except no black pudding out here. I shall substitute a home-made pork burger.
* This is an old Anglo-Saxon phrase meaning 'get totally wasted'. 
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I am familiar with the phrase and it's meaning: I may have had a drink or two many, many times in the past ...
I'd suggest a large glass of water beside the bed as well: dehydration is one cause of a nasty hangover.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote:
I'd suggest a large glass of water beside the bed as well:
Better a bottle (or two)
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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I'd suggest a water bed 
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Well, next thursday will be my stuffing day, going to an "All you can eat" sushi restaurant. We visited that a few times before and every time we say "we should not eat that much", but of course we can not resist the temptation. In addition to sushi they also serve traditional snacks like french fries and frikandel
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"Frikandel" is a new one to me: and ... um ... the pictures of it aren't appetising: What on Earth is a "Frikandel"? Your Guide to Where to Eat It![^] - that looks like a dog ate it yesterday, and now we're out on "walkies" ... 
I'm sure it's delicious, but ...
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Never touch the things myself, but I know a lot of people that do, you can get them everywhere in Holland and they are very cheap
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RickZeeland wrote: they are very cheap
That doesn't encourage confidence!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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