A Dead Photographic Format Rises From The Ashes

December 2, 2022 by Jenny List 34 Comments

Sometimes we stumble upon a hack that’s not entirely new but which is still pretty exceptional. So it is with [Hèrm Hofmeyer]’s guide to recreating a film cartridge for the Kodak Disc photographic format. It’s written in 2020, but describing a project around a decade old.

The disc format was Kodak’s great hope in the 1980s, the ultimate in photographic convenience in which the film was a 16-shot circular disc in a thin cartridge. Though the cameras were at the consumer end of the market they were more sophisticated than met the eye, with the latest electronics for the time and some innovative plastic multi-element aspherical lenses. It failed in the face of better compact 35 mm cameras because the convenience of the disc wasn’t enough to make up for the relatively small negative and that few labs had the specialized printing equipment to get the best results from the format. The cameras faded from view, and the film ceased manufacture at the end of the 1990s.

The biggest hurdle to creating a Disc cartridge comes in the cartridge shells themselves. It’s solved by sourcing them second-hand from Film Rescue International, a specialist in developing expired photographic film. The stages follow the cutting of a film disc, perforating its edges, and fitting it into the cartridge. It’s an exact enough process in the pictures, and it’s worth remembering that in the real cartridges it must be done in the dark.

This is an interesting piece of work for anyone with an interest in photography, and while the Disc cameras were always a consumer snapshot camera we can see that it would appeal to those influenced by Lomography. We wish we could get our hands on a Disc cartridge, an maybe CAD up a 3D printable version to make it more accessible.

Interfacing An Old Engine Cowl Flaps Indicator To USB

November 29, 2022 by Dave Rowntree 9 Comments

[Glen Akins] had a WW2-era aircraft engine cowl flap indicator lying around (as you do) and thought it would make a jolly fine USB-attached indicator. The model in question is a General Electric model 8DJ4PBV DC Selsyn, which was intended for four-engined aircraft. For those not familiar with the purpose [Glen] explains in his detailed writeup, that piston-engine aircraft of that era were air-cooled, and during conditions of maximum engine power — such as during take-off — flaps on the side of the engine cowling could be opened to admit additional cooling airflow. These indicator dials were connected to a sender unit on each of the flap actuators, providing the pilots an indication of the flaps’ positions. Continue reading “Interfacing An Old Engine Cowl Flaps Indicator To USB” →

Jansen's linkage, paper model of a bar linkage

Making Paper Strandbeesten

November 25, 2022 by Anne Ogborn 15 Comments

We love the artistry of paper mechanisms. Simple tools and techniques creating humor, beauty, and amazement.

[Federico Tobon] from [Wolfcat Workshop] makes amazing automata, crosses between cut paper art, origami, and traditional carved wood automata. He’s put out a useful new video on making linkages in paper parts.

In this short video, [Federico] shows us how to make a paper version of the leg mechanism for [Theo Jansen]’s classic Strandbeest, which we’ve covered in many variations.

Rotating joints in paper automata are sometimes done with a mechanical fastener like a post screw, but it violates the simplicity of the affair and often looks clunky. [Federico] uses a simple self fastener. A 5 mm hole in one part mates with two “flaps” in the other part. He’s made a separate video covering how to make the fastenings. He’s using a paper crafter’s Cricut-type machine to cut the parts. Pretty cool.

We’ve covered lots of other cool stuf from [Wolfcat Workshop]. If you want more of his automata eye candy, check out Simple Automata Extravaganza.

A Commodore SX-64 showing a six-digit code and a countdown timer

Generating Two-Factor Authentication Codes With A Commodore 64

November 14, 2022 by Robin Kearey 15 Comments

If you’ve used a corporate VPN or an online-banking system in the past fifteen years or so, chances are you’ve got a few of those little authenticator key fobs lying around, still displaying a new code every 30 seconds. Today such one-time codes are typically sent to you by text message or generated by a dedicated smartphone app, which is convenient but a bit boring. If you miss having a dedicated piece of hardware for your login codes, then we’ve got good news for you: [Cameron Kaiser] has managed to turn a Commodore SX-64 into a two-factor authenticator. Unlike a key fob that’s one gadget you’re not likely to lose, and any thief would probably need to spend quite some time figuring out how to operate it. Continue reading “Generating Two-Factor Authentication Codes With A Commodore 64” →

ColecoVision Barn Find Gets Wireless Makeover

November 14, 2022 by Robin Kearey No comments

Few things are more satisfying than finding an old, forgotten piece of technology somewhere and bringing it back to life. And while it’s great to see a rare sports car or an Apollo Flight Computer being restored, even not-very-successful game consoles from the 1980s can make for some great repair stories. Just look at how [Discreet Mayor] describes his restoration and modification efforts on a ColecoVision that he literally found in a barn.

Given that the ColecoVision was on the market between 1982 and 1985, we can assume that [Discreet Mayor]’s console had been sitting on a shelf for at least three decades, and the machine was definitely showing its age. Several components had failed due to corrosion, including the clock crystal, a 7400 series logic chip and a capacitor in the power supply, but since these are all standard components it was rather straightforward to replace them.

The controllers however were sadly beyond repair. Replacing them with standard joysticks wasn’t really an option because the ColecoVision controllers included a numeric keypad, which was mainly used to select game options. Making something completely new was the way to go, and [Discreet Mayor] decided to go for a wireless system while he was at it. After all, he had already developed a modular wireless IoT system based on the IEEE 802.15.4 standard, which turned out to be a perfect fit for this system.

[Discreet Mayor] built a simple joystick-plus-fire-button setup on a piece of MDF and equipped it with his IoT transmitter. Instead of adding a replacement numeric keypad he decided to use the joystick to simulate the most commonly-used buttons: “right” for “1”, “down” for “2” and so on. The receiver module uses digital switches to mimic keypresses to the console’s input port. The end result might look a bit hacky, but the console is fully functional again and runs its games just like it did over thirty years ago.

We’ve seen several projects that add wireless controllers to a variety of classic consoles. If you’ve got a ColecoVision that turns out to be beyond salvaging, you can always just build your own from scratch.

Power Up Vintage Electronics Less Unsafely With A Dim-Bulb Tester

November 13, 2022 by Donald Papp 55 Comments

Plugging in something like an antique radio to see if it works is a good way to have a bad time, because some old components don’t age well. For vintage electronics, inspection and repair are steps one and two. When it comes time to cautiously apply power, it’s best to use what’s called a dim-bulb tester and most hackers can probably put one together from scrap.

Being able to use one (or both) bulbs adds some flexibility, and the embedded power monitor is an inexpensive and handy addition.

These testers make it easier, and safer, to tell if there are any big problems with a device’s power supply. In its simplest form, a dim-bulb tester puts an incandescent lamp in series between a device — like an old radio — and the AC power from a wall socket. Thanks to this, if the device has a short circuit, the bulb will simply light up instead of causing any damage.

Ideally, one uses a bulb with a wattage rating that is roughly equal to the power consumption of the device being tested. If all is well, the bulb will glow very faintly and the device will work normally. A brightly glowing bulb would indicate excessive current draw. To allow some flexibility, [Doz]’s tester design allows using one or two 60 W incandescent bulbs in series, and even incorporates an inexpensive power monitor.

A dim-bulb tester isn’t an in-depth diagnostic tool but it is effective, simple, and allows for a safe startup even if there’s a serious problem like a short. It helps protect valuable hardware from going up in smoke. In fact, the fundamental concept of limiting power to protect hardware in case of a fault has also been applied in the world of retrocomputing, where it helps protect otherwise irreplaceable hardware if something goes wrong.

Play DOOM On Seven-Segment Displays

October 29, 2022 by Bryan Cockfield 12 Comments

Getting DOOM to run on a computer it was never meant to run on is a fun trope in the world of esoteric retro computers. By now we’ve seen it run on everything from old NES systems to microwaves, treadmills, and basically anything with a computer inside of it. What we don’t often see are the displays themselves being set up specifically to run the classic shooter. This build might run the game itself on ordinary hardware, but the impressive part is that it’s able to be displayed on this seven-segment display.

This build makes extensive use of multiplexers to drive enough seven-segment displays to use as a passable screen. There are 1152 seven segment digits arranged in a 48 by 24 array, powered by a network of daisy-chained MAX7219 chips. A Python script running on a Raspberry Pi correlates actual image data with the digit to be displayed on each of the segments, and the Raspberry Pi sends all of that information out to the screen. The final result is a display that’s fast enough and accurate enough to play DOOM in a truly unique way.

There is much more information available about this project on their project page, and they have made everything open source for those who wish to follow along as well. The project includes more than just the ability to play DOOM, too. There’s a built-in video player and a few arcade programs programmed specifically to make use of this display. Perhaps one day we will also see something like this ported to sixteen-segment displays instead of the more common seven-segment.