How Many Phones Sport A 5 And 1/4 Diskette Drive? This One.

September 27, 2025 by Tyler August 13 Comments

It all started with a sarcastic comment right here on Hackaday.com: ” How many phones do you know that sport a 5 and 1/4 inch diskette drive?” — and [Paul Sanja] took that personally, or at least thought “Challenge accepted” because he immediately hooked an old Commodore floppy drive to his somewhat-less-old smartphone.

The argument started over UNIX file directories, in a post about Redox OS on smartphones— which was a [Paul Sajna] hack as well. [Paul] had everything he needed to pick up the gauntlet, and evidently did so promptly. The drive is a classic Commodore 1541, which means you’ll want to watch the demo video at 2x speed or better. (If you thought loading times felt slow in the old days, they’re positively glacial by modern standards.) The old floppy drive is plugged into a Google Pixel 3 running Postmarket OS. Sure, you could do this on Android, but a fully open Linux system is obviously the hacker’s choice. As a bonus, it makes the whole endeavor almost trivial.

Continue reading “How Many Phones Sport A 5 And 1/4 Diskette Drive? This One.” →

Set Phone To… Hyperspectral

September 26, 2025 by Al Williams 24 Comments

While our eyes are miraculous little devices, they aren’t very sensitive outside of the normal old red, green, and blue spectra. The camera in your phone is far more sensitive, and scientists want to use those sensors in place of expensive hyperspectral ones. Researchers at Purdue have a cunning plan: use a calibration card.

The idea is to take a snap of the special card and use it to understand the camera’s exact response to different colors in the current lighting conditions. Once calibrated to the card, they can detect differences as small as 1.6 nanometers in light wavelengths. That’s on par with commercial hyperspectral sensors, according to the post.

You may wonder why you would care. Sensors like this are useful for medical diagnostic equipment, analysis of artwork, monitoring air quality, and more. Apparently, high-end whisky has a distinctive color profile, so you can now use your phone to tell if you are getting the cheap stuff or not.

We also imagine you might find a use for this in phone-based spectrometers. There is plenty to see in the hyperspectral world.

How Water Vapor Makes Smartphones Faster

September 25, 2025 by Lewin Day 25 Comments

Once upon a time, home computers were low-powered enough that they barely needed any cooling at all. An Amiga 500 didn’t even have a heatsink on the CPU, while the early Macintosh got by with a single teeny little fan.

Modern smartphones are far more powerful than these ancient machines, packed with multi-core processors running at speeds of many gigahertz. Even still, they’ve generally been able to get by without any active cooling devices. However, as manufacturers continue to push the envelope of performance, they’ve had to scramble for ways to suck heat out of these handheld computers. Vapor chamber cooling has risen as a solution to this problem, using simple physics to keep your handset humming along at maximum speed for longer.

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IPhone Air Still Apparently Repairable Despite Its Compact Construction

September 22, 2025 by Lewin Day 13 Comments

Miniaturization is a trend that comes and goes in the cellular phone space. For a while, our phones were all getting smaller, then they started getting bigger again as screens expanded to show us ever more content and advertising. The iPhone air is going back the other way, with a design that aims to sell based on its slimness. [iFixit] reckons that despite its diminutive dimensions, it should still be quite repairable.

“Thinner usually means flimsier, harder to fix, and more glued-down parts, but the iPhone Air proves otherwise,” states Elizabeth Chamberlain for the repair outlet. Much of this comes down to clever design, that makes repair possible at the same time as ensuring compactness. A big part of this is the way that Apple made the bottom half of the phone pretty much just battery. Most of the actual electronic components are on a logic board up by the camera. Segmenting the phone in this way makes it easier to access commonly-replaced parts like the battery without having to pull a lot of other parts out of the way first.

[iFixit] refers to this as flattening the “disassembly tree”—minimizing the number of components you have to touch to replace what you’re there to fix. In this regard, the thinness of the iPhone Air is actually a boon. The phone is so thin, it wasn’t possible to stack multiple components on top of each other, so everything is easier to get to. The design is also reasonably modular, which should make routine repairs like USB C port swaps relatively straightforward.

Whatever smartphone you’re working on, it often helps to have a disassembly guide to ensure you don’t wreck it when you’re trying to fix something. [iFixit] remains a stellar resource in that regard. Continue reading “IPhone Air Still Apparently Repairable Despite Its Compact Construction” →

Acoustic Coupling Like It’s 1985

August 27, 2025 by Bryan Cockfield 20 Comments

Before the days of mobile broadband, and before broadband itself even, there was a time where Internet access was provided by phone lines. To get onto a BBS or chat on ICQ required dialing a phone number and accoustically coupling a computer to the phone system. The digital data transmitted as audio didn’t have a lot of bandwidth by today’s standards but it was revolutionary for the time. [Nino] is taking us back to that era by using a serial modem at his house and a device that can communicate to it through any phone, including a public pay phone.

As someone in the present time can imagine, a huge challenge of this project wasn’t technical. Simply finding a working public phone in an era of smartphones was a major hurdle, and at one point involved accidentally upsetting local drug dealers. Eventually [Nino] finds a working pay phone that takes more than one type of coin and isn’t in a loud place where he can duct tape the receiver to his home brew modem and connect back to his computer in his house over the phone line like it’s 1994 again.

Of course with an analog connection like this on old, public hardware there were bound to be a few other issues as well. There were some quirks with the modems including them not hanging up properly and not processing commands quickly enough. [Nino] surmises that something like this hasn’t been done in 20 years, and while this might be true for pay phones we have seen other projects that use VoIP systems at desk phones to accomplish a similar task.

Continue reading “Acoustic Coupling Like It’s 1985” →

The World’s First Podcaster?

August 13, 2025 by Al Williams 12 Comments

When do you think the first podcast occurred? Did you guess in the 1890s? That’s not a typo. Telefonhírmondó was possibly the world’s first true “telephone newspaper.” People in Budapest could dial a phone number and listen to what we would think of now as radio content. Surprisingly, the service lasted until 1944, although after 1925, it was rebroadcasting a radio station’s programming.

Tivadar Puskás, the founder of Budapest’s “Telephone Newspaper” (public domain)

The whole thing was the brainchild of Tivadar Puskás, an engineer who had worked with Thomas Edison. At first, the service had about 60 subscribers, but Puskás envisioned the service one day spanning the globe. Of course, he wasn’t wrong. There was a market for worldwide audio programs, but they were not going to travel over phone lines to the customer.

The Hungarian government kept tight control over newspapers in those days. However, as we see in modern times, new media often slips through the cracks. After two weeks of proving the concept out, Puskás asked for formal approval and for a 50-year exclusive franchise for the city of Budapest. They would eventually approve the former, but not the latter.

Unfortunately, a month into the new venture, Puskás died. His brother Albert took over and continued talks with the government. The phone company wanted a piece of the action, as did the government. Before anything was settled, Albert sold the company to István Popper. He finalized the deal, which included rules requiring signed copies of the news reports to be sent to the police three times a day. The affair must have been lucrative. The company would eventually construct its own telephone network independent of the normal phone system. By 1907, they boasted 15,000 subscribers, including notable politicians and businesses, including hotels. Continue reading “The World’s First Podcaster?” →

Personalization, Industrial Design, And Hacked Devices

July 26, 2025 by Elliot Williams 28 Comments

[Maya Posch] wrote up an insightful, and maybe a bit controversial, piece on the state of consumer goods design: The Death Of Industrial Design And The Era Of Dull Electronics. Her basic thesis is that the “form follows function” aesthetic has gone too far, and all of the functionally equivalent devices in our life now all look exactly the same. Take the cellphone, for example. They are all slabs of screen, with a tiny bezel if any. They are non-objects, meant to disappear, instead of showcases for cool industrial design.

Of course this is an extreme example, and the comments section went wild on this one. Why? Because we all want the things we build to be beautiful and functional, and that has always been in conflict. So even if you agree with [Maya] on the suppression of designed form in consumer goods, you have to admit that it’s not universal. For instance, none of our houses look alike, even though the purpose is exactly the same. (Ironically, architecture is the source of the form follows function fetish.) Cars are somewhere in between, and maybe the cellphone is the other end of the spectrum from architecture. There is plenty of room for form and function in this world.

But consider the smartphone case – the thing you’ve got around your phone right now. In a world where people have the ultimate homogeneous device in their pocket, one for which slimness is a prime selling point, nearly everyone has added a few millimeters of thickness to theirs, aftermarket, in the form of a decorative case. It’s ironically this horrendous sameness of every cell phone that makes us want to ornament them, even if that means sacrificing on the thickness specs.

Is this the same impetus that gave us the cyberdeck movement? The custom mechanical keyboard? All kinds of sweet hacks on consumer goods? The need to make things your own and personal is pretty much universal, and maybe even a better example of what we want out of nice design: a device that speaks to you directly because it represents your work.

Granted, buying a phone case isn’t necessarily creative in the same way as hacking a phone is, but it at least lets you exercise a bit of your own design impulse. And it frees the designers from having to make a super-personal choice like this for you. How about a “nothing” design that affords easy personalized ornamentation? Has the slab smartphone solved the form-versus-function fight after all?