This month’s Hobby Tech column opens on an interview with Ryan Brown on the impressive Quarter Arcades miniature fully-licensed reproduction arcade cabinets, moves on to a review of the RISC-V-based Seeed Studio Grove AI HAT for the Raspberry Pi, and closes with a look at Pimoroni’s clever Inky wHAT electrophoretic display.
First, the interview. Answering the important question first, Brown admitted that “the pun certainly helps” when it came to deciding to what scale the Quarter Arcades cabinets should be produced: each carefully-designed reproduction, modelled on real period-appropriate cabinets, is built to a quarter scale both as a means of having it sit nicely on a desk and of providing a name which echoes the most commonly-required coin of US arcade cabinets.
While the Quarter Arcade range is currently limited to licensed properties including Pac-Man and Galaga, Brown has indicated there’s potential there to expand: “Starting with the most beloved classics really helps us open doors to other, more niche arcade games, and even potentially games that never reached the arcade.”
The Seeed Studio Grove AI HAT, by contrast, was an undeniable disappointment. Based on the Kendryte K210 system-on-chip, which uses the RISC-V instruction set architecture and includes a co-processor designed to accelerate artificial intelligence workloads, the AI HAT can be used as a stand-alone development board or attached on top of a Raspberry Pi – but in the latter mode is almost entirely divorced from the Pi itself, to the point where it’s not even possible to program the AI HAT without detaching it again and connecting it to a more traditional PC.
Finally, the Inky wHAT. Another Raspberry Pi HAT (Hardware Attached on Top) board, the Inky wHAT offers a 4.2″ electrophoretic display in three colours: red, black, and white in the model reviewed, with a yellow variant available alongside a slightly cheaper black-and-white two-colour version. Forming the heart of a project which will appear in next month’s magazine, the Inky wHAT impressed – though it would be nice to see the price drop a little, given how cheap full-colour though considerably more power-hungry LCD panels are these days.
Custom PC Issue 195 is available now at all good supermarkets, newsagents, and digitally through the usual outlets.
First, the vintage gaming feature. Building on a brief from editor Ben Hardwidge, I wanted to do something a little more in-depth than the usual how-to guide. The result is a seven-page feature which begins with a look at the wealth of accessories available to turn a Raspberry Pi or other single-board computing into a powerful emulation station, a two-page expert guide to the legalities of emulation in the UK, step-by-step instructions on downloading, installing, and configuring the RetroPie on a Raspberry Pi, and a look at entirely legitimate sources for read-only memory (ROM) game images.
While I’m fully equipped to handle the how-to and look-at-the-shiny-things sections of the guide myself, the legal aspect required an expert eye kindly provided by Eaton Smith LLP partner Chris Taylor. Legal counsel to a variety of game development and publishing companies, Chris kindly walked through the legalities of developing, downloading, and using emulation software and hardware under UK law – and even threw in a cheeky topical reference to Ernest Cline’s Ready Player One ahead of the release of its film adaptation. I’m also grateful to The Internet Archive’s software curator Jason Scott for taking the time to discuss the Archive’s vast trove of software and in-browser emulation functionality.
Meltdown and Spectre, meanwhile, are a lot less fun. The names given to a quartet of security vulnerabilities hard-baked in to the vast majority of processors built since the 1990s, Meltdown and Spectre are unarguably the worst things to happen to the computer industry since the death of the Commodore Amiga. My three-page look discusses the vulnerabilities, how they can be exploited to gain access to supposedly-protected information, and what companies are doing to fix the problems – and, spoiler, the conclusion there is “not nearly enough.” Since the piece was written, though, there’s one thing to note: installation of the KB4056892 patch for Windows 10 includes faulty microcode protection from Intel which can cause systems to reboot spontaneously, which is resolved through the installation of KB4078130 at the cost of disabling protections against one of the two Spectre vulnerabilities.
Finally, Hobby Tech itself opens with a look at the clever but fragile Opendime from cryptocurrency start-up Coinkite. Designed to turn Bitcoin into a digital bearer bond, an Opendime creates a private key which is stored in a secure enclave accessible only by irrevocably modifying the device by popping off a small surface-mount resistor. So long as the resistor is intact, the theory goes, nobody has access to the private key – meaning you can accept the device as payment without risk. Sadly, since my fairly glowing review was written two things have changed: the Opendime I’ve been carrying around on my keyring has unsealed itself without any visible damage to the resistor or the heatshrink which protects it, an issue Coinkite’s founder and support team have singularly failed to address, and the high transaction fees on the Bitcoin network have dropped from around £20 to around 20p meaning one of the major benefits of using a £15 USB device for in-person transactions has been lost.
The iFixit Pro Tech Toolkit, by contrast, is a significantly happier story. I’ve long been a fan of iFixit’s teardowns and the software they developed for presenting the information, so a toolkit with the iFixit seal of approval was high on my want list. Having now received one, I can confirm it’s no disappointment: from the high-quality tools, all bundled with the express intention of making it as easy as possible to dismantle modern electronics, to the smart multi-function storage case, the entire bundle is pleasingly robust.
Finally, Commodore: The Amiga Years. The follow-up to author Brian Bagnall’s Commodore: A Company on the Edge, The Amiga Years was officially cancelled years ago before being resurrected through a crowdfunding campaign. Since the closure of the campaign, however, the project was beset by delays and a last-minute editing decision that sees the final third of the story, taking Commodore to its sad demise, spun out into yet another book – a move backers criticising the decision have positioned as a blatant attempt at extracting more money. As with A Company on the Edge, though, the story told in The Amiga Years is one well worth the entry price – if suffering a little from Bagnall’s wandering editorial process, whereby topics raised as though you should already know them in Chapter 2 won’t be formally introduced until Chapter 5.
All this, and slightly less stuff by people who aren’t me, can be found at your nearest supermarket, newsagent, or digitally via Zinio and similar services.
My Hobby Tech spread continues in Issue 143 of Dennis Publishing’s Custom PC Magazine with two reviews and a review-slash-walkthrough: the Orange Pi Plus, the GrovePi+ Starter Kit, and the Kim Uno kit.
For me, the most interesting toy of the month was undoubtedly the Kim Uno. Designed by Oscar Vermeulen, the Kim Uno is a kit-form microcomputer designed to emulate the classic MOS Technologies KIM-1, designed by Chuck Peddle to showcase the company’s at-the-time cutting-edge 6502 microprocessor. Naturally, there’s no 6502 to be found in the Kim Uno: instead, an Arduino Pro Mini – based on one of Atmel’s popular microcontrollers – sits at the rear of a calculator-sized circuit-board and provides the grunt required to run any KIM-1 application you care to name, including the famous Microchess.
A simple solder-it-together kit – or pay extra to have one built by Oscar’s own fair hand – the Kim Uno is a great way to practice your skills even before you tackle the joys of 6502 machine-code programming. Oscar’s online documentation is thorough and detailed, and for anyone who knows 6502 the Kim Uno is a must-have especially at just £10 plus shipping.
The Kim Uno was the most fun project of the month, but it was closely followed by a GrovePi+ Starter Kit kindly supplied by Dexter Industries. Designed to bring Seeed’s Grove ‘smart module’ design to the Raspberry Pi, the kit includes a piggyback board which connects to the Pi’s GPIO port and a wealth of additional inputs and outputs, all of which connect via simple keyed wires. For newcomers to electronics, the Grove platform takes the complexity out of wiring up even relatively complex projects – and the GrovePi+ board itself makes using Grove hardware a cinch.
Finally, the Orange Pi Plus is one of the growing number of would-be Raspberry Pi beaters coming out of the technology markets of China. Using the AllWinner H3 system-on-chip processor the Orange Pi Plus can’t match the performance of the latest Raspberry Pi 2 Model B, but it does offer significantly more built-in capability: SATA, gigabit Ethernet, infra-red, even 802.11b/g/n wireless with bundled ultra-compact dipole antenna. The Orange Pi Plus, and the other members in the Orange Pi family, are clearly inspired by Lemaker’s Banana Pi and offer much of the same software compatibility, including platforms like Android not supported by the Raspberry Pi itself.
If you want to know my final opinion on all this hardware, or if you’re for some reason interested in things written by people who aren’t me, Custom PC Issue 143 is available now in print or digital form.