Hackaday Links Column Banner

Hackaday Links: November 13, 2022

Talk about playing on hard mode! The news this week was rife with stories about Palmer Luckey’s murder-modified VR headset, which ostensibly kills the wearer if their character dies in-game. The headset appears to have three shaped charges in the visor pointing right at the wearer’s frontal lobe, and would certainly do a dandy job of executing someone. In a blog post that we suspect was written with tongue planted firmly in cheek, Luckey, the co-founder of Oculus, describes that the interface from the helmet to the game is via optical sensors that watch the proceeding on the screen, and fire when a certain frequency of flashing red light is detected. He’s also talking about ways to prevent the removal of the headset once donned, in case someone wants to tickle the dragon’s tail and try to quickly rip off the headset as in-game death approaches. We’re pretty sure this isn’t serious, as Luckey himself suggested that it was more of an office art thing, but you never know what extremes a “three commas” net worth can push someone to.

There’s light at the end of the Raspberry Pi supply chain tunnel, as CEO Eben Upton announced that he foresees the Pi problems resolving completely by this time next year. Upton explains his position in the video embedded in the linked article, which is basically that the lingering effects of the pandemic should resolve themselves over the next few months, leading to normalization of inventory across all Pi models. That obviously has to be viewed with some skepticism; after all, nobody saw the supply chain issues coming in the first place, and there certainly could be another black swan event waiting for us that might cause a repeat performance. But it’s good to hear his optimism, as well as his vision for the future now that we’re at the ten-year anniversary of the first Pi’s release.

Continue reading “Hackaday Links: November 13, 2022”

A man removing a module from a 1960s computer

Ancient Nuclear Plant Computer Finds New Home In Bletchley Museum

Although technology keeps advancing every year, safety-critical systems in factories and power plants typically stay with the technology that was available when they were built, in the spirit of “don’t fix it if it ain’t broke”. When it comes to safety, there are probably few systems more critical than nuclear power plants, and as a result one power station in Dungeness, in the south-east of England, was controlled by the same Ferranti Argus 500 computer from the early 1970s until the reactor was shut down in 2018.

The national Museum of Computing in Bletchley was lucky enough to be allowed to scavenge the old computer from the decommissioned plant, and volunteers at the museum have managed to get it running again in its new home. They describe the process in the video embedded below, and demonstrate a few features of this rather unique piece of 1970s technology.

The computer consists of several large cabinets that house enormous PCBs full of diode-transistor logic (DTL) chips, made by Ferranti itself. It comes with 32 kilo-words, or 96 kilobytes, of magnetic core memory, and was designed to run programs stored on punched tape. However, the paper tape reader was removed at some point in the computer’s life and replaced with a PC-based system that emulates the tape reader’s output through its parallel port. This was probably sometime during the 1990s, judging from the fact that the https://hackaday.com/tag/magnetic-core-memory/PC runs OS/2.

Setting up the computer in its new home was complicated by the fact that hundred of cables had to be disconnected in order to move the system out of the power plant. With the help of decades-old documentation, and the experience of one volunteer who used to be a Ferranti engineer, they eventually got it into a state where it could run programs again.

Ultimately, the Argus 500 will be turned into a live exhibit that will simulate a power station alongside another computer that was rescued from a different nuclear plant. Depending on the availability of some parts that are still missing, this might happen later this year, or perhaps next year. In any case, the museum already has a collection that’s well worth visiting if you’re in the area. The story of how they rescued a neglected IBM 360 also makes for fascinating reading. Continue reading “Ancient Nuclear Plant Computer Finds New Home In Bletchley Museum”

Frequency Counter Restoration Impeded By Kittens

We think of digital displays as something you see on relatively modern gear. But some old gear had things like nixies or numitrons to get cool-looking retro digital displays. The HP 521A frequency counter, though, uses four columns of ten discrete neon bulbs to make a decidedly low-tech but effective digital display. [Usagi Electric] has been restoring one of these for some time, but there was a gap between the second and third videos as his workshop became a kitten nursery. You can see the last video below.

In previous videos, he had most of the device working, but there were still some odd behavior. This video shows the final steps to success. One thing that was interesting  is that since each of the four columns are identical, it was possible to compare readings from one decade to another.

However, in the end, it turned out that the neon bulbs were highly corroded, and replacing all the neon bulbs made things work better. However, the self-check that should read the 60 Hz line frequency was reading 72 Hz, so it needed a realignment. But that was relatively easy with a pot accessible from the back panel. If you want to see more details about the repair, be sure to check out the earlier videos.

We love this old gear and how clever designers did so much with what we consider so little. We hate to encourage your potential addiction, but we’ve given advice on how to acquire old gear before. If you want to see what was possible before WS2812 panels, you could build this neon bulb contraption.

Continue reading “Frequency Counter Restoration Impeded By Kittens”

Re-reclaimed From Nature: Resurrecting A DT80 Terminal

When Datamedia announced their new DT80 terminal as a VT100 killer back in 1979, they were so confident of its reliability, they threw in a full one-year warranty. Now, decades later, that confidence is once more put to the touch after [RingingResonance] fished one such terminal out of a creek by an old illegal dumping site. Not knowing what to expect from the muck-ridden artifact, his journey of slowly breathing life back into the device began.

Brings new meaning to the term “rooted”

Considering the layers of mud and roots already growing all over the main board, one can only assume how long the terminal has actually been in there. But cleaning it from all that was only the beginning: some components were missing, others turned out to be broken, including some of the ROMs, which [RingingResonance] speculates may have been caused by lightning which determined the DT80’s fate in the first place.

That’s when the adventure really started though, digging deep into the terminal’s inner life, eventually writing a debugger and own firmware for it. That code, along with all other research, notes, and links to plenty more pictures can be found in the GitHub repository, and is definitely worth checking out if you’re into the technologies of yesteryear.

Despite the DT80’s claimed superiority, the VT100 prevailed and is the terminal that history remembers — and emulates, whether as tiny wearable or a full look-alike. But this fall into oblivion was also part of [RingingResonance]’s motivation to keep going forward restoring the DT80. Someone had to. So if you happen to have anything to contribute to his endeavours or share with him, we’re sure he will appreciate you reaching out to him.

Continue reading “Re-reclaimed From Nature: Resurrecting A DT80 Terminal”

Tiny Arcade Uses Tiny CRT

Restoring vintage electronics is a difficult hobby to tackle. Even the most practical builds often have to use some form of modern technology to work properly, or many different versions of the machine need to be disassembled to get a single working version. Either way, in the end someone will be deeply hurt by the destruction of anything antique, except perhaps with [Marco]’s recent tiny arcade with a unique CRT display.

The CRT is a now-obsolete technology, but Arcade and MAME purists often seek them out because of the rounded screen and vintage feel these devices have when compared to modern LCD or LED displays. For a build this small, though, [Marco] couldn’t just use parts from an old TV set as there wouldn’t be clearance in the back of the cabinet. An outdated video conferencing system turned out to have just the part he needed, though. It has a CRT mounted perpendicularly to a curved screen in order to reduce the depth needed dramatically.

The final build uses a tiny Namco system meant to plug into the RCA jack on a standard TV, but put in a custom case that makes it look like an antique video game cabinet. It’s an interesting build that doesn’t destroy any valuable antique electronics, while still maintaining a classic arcade feel. If you’re building a larger arcade cabinet which will still satisfy the purists out there, make sure you’re using a CRT with the right kind of control system.

Continue reading “Tiny Arcade Uses Tiny CRT”

Restoring $5 Busted Synthesizer Made Easy, Thanks To Thermal

[D. Scott Williamson] paid $5 for a Roland JV-30 synthesizer at a garage sale. Score! There was only one catch: it didn’t work and didn’t include the power supply. Luckily, restoring it was made easier by breaking out a thermal camera.

As mentioned, the keyboard was missing a 9 VDC power supply (rated 800 mA) with a center-negative barrel connector. Slightly oddball, but nothing an enterprising hacker can’t deal with. After supplying power with a bench supply, not only did the keyboard not come to life, but the power supply clamped the current draw at 1.5 A! Something was definitely not right.

This shorted glass-bodied diode might look normal to the naked eye, but thermal imaging makes it clear something’s amiss.

Inside, there was no visible (or olfactory) sign of damage, but looking closer revealed that a little SMT capacitor by the power connector was cracked in two. Fixing that didn’t bring the keyboard to life, so it was time to break out the thermal imager. Something was soaking up all that current, and it’s a fair bet that something is getting hot in the process.

The culprit? The reverse polarity protection diode was shorted, probably as a result of damage by an inappropriate power supply or a surge of some kind. Replacing it resulted in a working keyboard! Not bad at all for $5, a diode, an SMT cap, and a little workbench time. The finishing touch was replacing a missing slider knob, which took some work in OpenSCAD and a 3D printer. Overall, not bad!

Thermal imaging used to be the stuff of staggering price tags, but it’s downright accessible these days, and makes it easy to spot things that are hot when they shouldn’t be. And if a thermal camera’s lens isn’t what you think it should be? It’s even possible for a sufficiently motivated and knowledgeable hacker to modify those.

Reverse-Engineering Forgotten Konami Arcade Hardware

When fully-3D video games started arriving in the early 90s, some companies were more prepared for the change than others. Indeed, it would take nearly a decade of experimentation before 3D virtual spaces felt natural. Even then, Konami seems to have shot themselves in the foot at the beginning of this era with their first foray into 3D arcade games. [Mog] shows us the ins-and-outs of these platforms while trying to bring them back to life via MAME.

These arcade machines were among the first available with fully-3D environments, but compared to offerings from other companies are curiously underpowered, even for the time. They include only a single digital signal processor which is tasked with calculating all of the scene geometry while competing machines would use multiple DSP chips to do the same job. As a result the resolution and frame rate are very low. Nonetheless, [Mog] set out to get it working in MAME.

To accomplish this task, [Mog] turned to a set of development tools provided to developers for Konami in the early 90s which would emulate the system on the PCs of the time. It surprisingly still worked on Windows 10 with minor tweaking, and with some other tools provided over the decades of others working on MAME these old Konami machines have some new life with this emulator support.

Not everything works perfectly, but [Mog] reports that most of the bugs and other issues were recently worked out or are being actively worked on by other experts in the field. If you remember these games from the arcade era of the 80s and early 90s, it might be time to grab an old CRT and fire this one up again.

Continue reading “Reverse-Engineering Forgotten Konami Arcade Hardware”