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This is a portfolio site for Gareth Halfacree, the former systems administrator currently earning a living as a full-time technology journalist and technical author. You may know him from his best-selling books the Raspberry Pi User Guide, The Official Raspberry Pi Beginner’s Guide, and the Official BBC micro:bit User Guide, or his contributions to national magazines, radio programmes, and publications including Imagine Publishing’s Genius Guide and Tips, Tricks, Apps & Hacks series – or even his eponymous “Gareth Halfacree’s Hobby Tech” feature, a five-page spread in Raspberry Pi Press’ Custom PC Magazine each month.

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The Official Raspberry Pi Handbook 2021

The Official Raspberry Pi Handbook 2021This year’s holiday release from Raspberry Pi Press is The Official Raspberry Pi Handbook 2021, a tome which collects 200 pages of content previously published in The MagPi and makes it available ready for wrapping and nestling under the tree.

My primary contribution for this year’s Handbook centres around the Raspberry Pi 400, the latest single-board computer in the Raspberry Pi family. Built into a keyboard housing, the most-in-one layout is a new venture for Raspberry Pi – and you’ll find my imagery in the book’s getting started section for newcomers.

You’ll also find a six-page abridged edition of my Raspberry Pi 400 feature from The MagPi Issue 100, down from the original twelve with the main removal being the detailed benchmarking. The new thinner variant still includes plenty of imagery, including a graphical tour of all the external features and ports found on the Raspberry Pi 400, plus my interview with its designer Simon Martin and Raspberry Pi Foundation founder Eben Upton.

You’ll find more of my work scattered throughout, too, including screenshots and tutorials cribbed from The Official Raspberry PI Beginner’s Guide 4th Edition – along with a wealth of material from my fellow MagPi contributors.

The Official Raspberry Pi Handbook 2021 is available to buy now with global delivery, or to download as a DRM-free Creative Commons-licensed PDF, on the official website.

The MagPi, Issue 100

The MagPi Issue 100For this bumper issue of The MagPi, celebrating 100 issues since its launch as a fanzine and subsequent adoption as the official Raspberry Pi magazine, I take a deep dive into the company’s latest single-board computer: the very-nearly-all-in-one Raspberry Pi 400.

Built into a keyboard housing, the Raspberry Pi 400 is almost everything you need: just add a USB Type-C power supply, microSD, mouse, and display. For those buying the Personal Computer Kit – previously the Desktop Kit – that’s reduced to only needing an external display. Better still, the design includes the Raspberry Pi family’s first passive cooling system – and a speed boost from 1.5GHz to 1.8GHz.

Across the hefty 12-page feature I take the reader on a visual tour of the new board’s external ports and internal features – stripping it down to the surprisingly large single-board computer ensconced within – before taking a break for an interview with principal hardware engineer Simon Martin and Raspberry Pi Foundation founder Eben Upton on the project’s origins and development.

Benchmarks follow, putting hard numbers to the speed boost that has seen the CPU clocked from the default 1.5GHz on the Raspberry Pi 4 to 1.8GHz on the Raspberry Pi 400. As with previous launches, these include historical measurements going all the way back to the original Raspberry Pi Model A and Model B – detailing the performance of every board, bar the industrial-focus Compute Modules, across synthetic and real-world workloads.

The full review is available now in The MagPi Issue 100 from supermarkets and newsagents, online with global delivery, or as a free Creative Commons licensed PDF download on the official website.

Custom PC, Issue 208

Custom PC Issue 208This month’s Hobby Tech column takes a look at the MicroPython programming environment, SunFounder’s RasPad 3 Raspberry Pi tablet conversion kit, and Frank Gasking’s book The Games That Weren’t.

I’ve been doing a lot of work with MicroPython of late, so it made sense to cover the software for Hobby Tech. Developed by Damien George as part of a crowdfunding campaign launched in 2013, MicroPython takes the popular Python programming language and ports it to microcontrollers – both dedicated PyBoard ranges and third-party hardware. It’s also the inspiration for CircuitPython, a port developed by Adafruit and designed with educational use in mind.

The RasPad 3, meanwhile, is a device I wanted to love. Built in an intriguing wedge shape, the kit takes a Raspberry Pi 4 single-board computer and turns it into a touch-screen tablet. The third in the series, and the first supporting the Raspberry Pi 4, the RasPad 3 is a great idea let down by poor execution – everything from a low-quality display and buggy software to dismal battery life and an incredibly noisy fan.

Finally, The Games That Weren’t is the latest coffee table book from Bitmap Books, based on the website of the same name by Frank Gasking. Built around the same core concept as Phil Atkinson’s Delete, The Games That Weren’t looks at video games – and a small number of related hardware projects, like the Commodore 65 – that never made it to market. At 643 pages it’s a hefty tome, but sadly let down by some high-profile absences – the ‘Van Buren’ build of Fallout 3 is present, but Fallout Online is nowhere to be found as just one example – and a woolly approach to research and citation which leans heavily on weasel-words like “it’s thought,” “some sources say,” and “it’s believed.”

You can pick up the latest Custom PC at your nearest supermarket, newsagent, or online with global delivery now.

The Official Raspberry Pi Beginner’s Guide, 4th Edition and Translations

The Official Raspberry Pi Beginner's Guide 4th EditionMy introductory Raspberry Pi book, The Official Raspberry Pi Beginner’s Guide, has now been released in a fourth edition, bringing updates for the Raspberry Pi 4 8GB, Raspberry Pi 400, and new software revisions.

Bundled with every Raspberry Pi Desktop Kit sold, and available in paperback and free-as-in-speech Creative Commons-licensed DRM-free PDF, The Official Raspberry Pi Beginner’s Guide has proven incredibly popular. The latest release includes updates to reflect changes in the Raspberry Pi OS and bundled software, alongside coverage of the all-in-one Raspberry Pi 400 and higher-specification Raspberry Pi 4 8GB.

The new edition is also now available in translation for the first time: As well as the original English edition, The Official Raspberry Pi Beginner’s Guide can now be read in French, German, Italian, and Spanish, with additional translations in the works. As always, my thanks go out to the translation team at Raspberry Pi Press for making that happen.

The Official Raspberry Pi Beginner’s Guide 4th Edition is available to buy now in all the above languages with global delivery from the official website; it can also be downloaded under free-as-in-speech terms as a Creative Commons-licensed PDF file, unencumbered by DRM. For anyone considering picking up a Raspberry Pi 400, a print copy of the book is also bundled in the Raspberry Pi 400 Desktop Kit as well as in the Raspberry Pi 4 Desktop Kit.

The MagPi, Issue 99

The MagPi Issue 99This month’s The MagPi, the official Raspberry Pi magazine, includes a hefty spread taking a look at the newly-launched Raspberry Pi Compute Module 4 – bringing the power of the Broadcom BCM2711 to the Compute Module form factor for the first time.

Well, sort of: the new Raspberry Pi Compute Module 4 is actually a wholly new form factor, ditching the old SODIMM edge connector in favour of two high-density connectors on the underside. While that means no backwards compatibility with existing Compute Module carrier boards, third parties have stepped up and launched interposer boards to let you squeeze the new board into old designs.

Having been provided with pre-release access to the Compute Module 4 and its IO Board, my launch feature takes a look at the physical layout and the components that go into the board – with macro photography, including coverage of the high-performance eMMC storage on-board selected models – and runs through a selection of benchmarks testing everything from synthetic and real-world performance to footprint and weight.

One particularly interesting aspect of the benchmarking, and one which will inform designs based around the new module, was thermal throttling analysis: the Raspberry Pi 4 is known to run reasonably hot, though enhancements since launch have brought the temperature down considerably, and moving the same technology into a smaller footprint means the Compute Module 4 gets toasty warm. As Raspberry Pi Foundation founder Eben Upton explained, passive cooling is going to be a must for most designs.

The MagPi Issue 99 is available now from all good newsagents and supermarkets, online with global delivery, or as a free-as-in-speech download under a Creative Commons licence.

Custom PC, Issue 207

Custom PC Issue 207This month’s Hobby Tech column for Custom PC Magazine takes a look at the hidden costs of stereolithographic (SLA) 3D printing, the RISC OS Direct operating system for the Raspberry Pi, and Steven K. Roberts’ classic memoir Computing Across America.

The 3D printing feature was born of a personal cost – literally, money I spent after diving head-first into the world of SLA 3D printing having been tempted by a low-cost entry-level printer. While the printer itself cost around £150, I spent as much again on the accessories required to get good results – from resin and cleaning tools to an ultraviolet curing station and the FEP sheets which form the bottom of the resin vat.

While the feature focuses on SLA printing, which uses a resin cured by exposure to ultraviolet light, there are costs associated with the more common FFF 3D printers too – including finding ways to protect the plastic filament they use from moisture.

Any readers of a certain vintage will likely remember the original RISC OS, an operating system developed initially for Acorn’s Archimedes family then for the later Risc PC. While Acorn itself went away, RISC OS didn’t – and the launch of the original Raspberry Pi, powered by Arm technology which started life at Acorn, gave it a shot in the arm.

RISC OS Direct is an effort to take the modern RISC OS and make it approachable for newcomers, rather than experienced RISC-takers. As a result, it includes a selection of applications pre-installed – from word processors to web browsers – and a handy-dandy wallpaper which doubles as a quick-reference guide. More detailed documentation is also provided, including electronic copies of programming manuals, for those who want to dive deeper.

Computing Across America, finally, isn’t a new book: It was published in the 1980s by Steven Roberts, the self-styled “high-tech nomad” who sold his house and possessions to cycle across America on a custom-built “Winnebiko” with little more than a TRS-80 Model 100 microcomputer for company. While now out of print, the title is available to borrow from The Internet Archive – and makes for fascinating, if often salacious, reading.

Custom PC Issue 207 is available now at all good supermarkets, newsagents, and online with global delivery from the official website.

Custom PC, Issue 206

Custom PC, Issue 206This month’s Hobby Tech feature takes a look at the recently-unearthed Nine Tiles prototype ROM for the ZX Spectrum by installing it on a ZX Spectrum Next, dramatically improves the flexibility of the FLIR ETS320 thermal inspection camera, and pores over classic computer commercials courtesy of coffee-table tome Do You Compute?.

First, the prototype ROM. In my review of the ZX Spectrum Next in Custom PC Issue 202, I mentioned that it’s possible to create new “machine personalities” – both by replacing the read-only memory (ROM) files used in Spectrum mode and by loading new cores onto the FPGA at the machine’s heart. Shortly prior to the ZX Spectrum Next’s launch, the Centre for Computing History received a trove of artefacts from Nine Tiles – including a prototype ZX Spectrum which was used to develop a ROM which never actually made it onto the publicly-launched machines.

The Centre had negotiated to make the ROM image available for free download for educational and academic purposes, which gave me an opportunity to load the ROM onto the ZX Spectrum Next and create the Nine Tiles Prototype as a usable machine personality. What followed was a process of debugging and reverse-engineering in order to make the ROM functional on the Next – a process which, I’m pleased to say, was wholly successful.

The FLIR ETS320, meanwhile, was reviewed back in Issue 201 – and one of my biggest complaints was its incredibly short focal length, meaning that it is only possible to analyse a very small part of a given circuit board under the thermal sensor. While the camera platform is capable of rising up, anything above 70mm away from the device on test is too blurry to be of use – unless, that is, you take advantage of a 3D-printed tool to manually adjust focus. The improvement is stark, as thermal images published in the piece demonstrate.

Finally, Do You Compute? is a book which looks not at the history of computing but at the history of selling computing – specifically, as the subtitle makes clear, “from the Atomic Age to the Y2K bug.” Put together by Ryan Mungia and Steven Heller, the book is a fantastic chronological walk through the shift in computers being for governments and big businesses to any businesses and eventually the home user.

It also has a major flaw, and it’s not one caused by the authors: Apple, for reasons unspecified, declined to provide permission for its adverts to be reproduced in the book. With Apple having been at the very forefront of the personal computing revolution, and well-known for iconic adverts from its 1984 Superbowl commercial to “Think Different” and “Rip Mix Burn,” it leaves a real hole in the book.

Custom PC Issue 206 is available now in supermarkets, newsagents, and online with global delivery via the official website.

Custom PC, Issue 205

Custom PC Issue 205This month’s Hobby Tech column opens with a look at the Raspberry Pi High Quality (HQ) Camera Module, Seeed Studio’s impressively feature-packed Wio Terminal development board, and Read Only Memory’s follow-up to game developer interview collection Britsoft, Japansoft.

First the Raspberry Pi HQ Camera Module. The third full revision of the Camera Serial Interface (CSI)-connected low-cost camera add-on for Raspberry Pi and compatible single-board computers – after the original Raspberry Pi Camera Module was replaced with a higher-quality Sony sensor upgrade – the HQ Camera Module is built around a 12.3-megapixel Sony IMX477 sensor, offering increased resolution and improved low-light performance.

The biggest change, though, is that the lens has gone: Instead of a small plastic lens pre-fitted to the sensor, the HQ Camera Module accepts C- and CS-mount lenses – the same type of lens you’d find for security camera sensors. Two lenses make up the official offerings – a 6mm wide-angle and a 16mm telephoto – with third parties selling various alternatives including microscope-style macro lenses.

The Wio Terminal has a sensor of its own, but it’s not a camera: it’s an almost-all-in-one development board built around Microchip’s ATSAMD51 system-on-chip. Packed into a plastic housing with 2.4″ 320×240 colour LCD, the development board includes buttons, joystick, buzzer, LED, light sensor, and an infrared emitter – but, oddly, no battery, which needs to be added using an external accessory which considerably increases the device’s bulk.

Perhaps the most interesting feature of the Wio Terminal, though, is its general-purpose input/output (GPIO) header: a 40-pin female header, it shares the Raspberry Pi pinout and allows the Wio Terminal to act as a standalone device or to be connected to a Raspberry Pi as a Hardware Attached on Top (HAT)-style accessory – though doing so without some kind of extension cable covers the sensors on the underside.

Finally, Japansoft is a follow-up to the impressive Britsoft which follows exactly the same format: selected bite-sized extracts from interviews with notable game developers, only this time – as the name implies – looking at the Japanese games industry rather than the British. Where Britsoft culled its material from interviews carried out for the 2014 documentary From Bedrooms to Billions, Japansoft isn’t an original publication either: everything within comes from John Szczepaniak’s The Untold History of Japanese Game Developers and is simply reformatted to match the style of Britsoft.

That’s not to say Japansoft isn’t worth reading, but it does mean that anyone who has already seen Szczepaniak’s work will find nothing new. It also makes no effort to fact-check any of the claims within, instead placing a warning that its contents do not represent “a verified factual account” of the history presented.

Custom PC Issue 205 is available now from all good newsagents, supermarkets, and online with global delivery from the official website.

Custom PC, Issue 204

Custom PC Issue 204In my Hobby Tech column this month I go hands-on with the Raspberry Pi 4 Model B 8GB single-board computer, the considerably more powerful Nvidia Jetson NX Developer Kit, and take a look at Alex Wiltshire and John Short’s Home Computers: 100 Icons that Defined a Digital Generation.

First, the Raspberry Pi 4. Launched with a view to providing power users with something a with a little more headroom than the 4GB model – itself a fourfold increase on the memory available on its direct predecessor the Raspberry Pi 3 – the new 8GB model doubles the maximum memory while retaining full backwards compatibility. With that said, though, getting the most out of the device does require a 64-bit operating system – and I take a look at third-party options as well as the Raspberry Pi Foundation’s own Raspberry Pi OS in 64-bit builds.

The Nvidia Jetson NX Developer Kit is another device that takes advantage of a 64-bit operating system, but with a very different focus: where the Raspberry Pi 4 Model B 8GB is aimed at hobbyists, the Nvidia Jetson NX Developer Kit looks towards the professional end of the market – and offers some serious GPU horsepower for machine learning work, plus a new “cloud native” software model that containerises workloads to separate them from the underlying OS and to make it easy to run multiple workloads on a single device.

Finally, Home Computers is another in a series of coffee-table tomes investigating early personal computers – but one with a twist: The 100 machines contained within are taken exclusively from The Centre for Computing History in Cambridge. Each is captured in a series of high-quality photographs, including some close-ups and detail shots you won’t find elsewhere, and accompanied with a short write-up of its origins and capabilities. While it would have been nice to see the machines switched on – each is captured in its powered-off state, a shame given the Centre’s reputation as a hands-on “living museum” – it’s still a great book for vintage computing enthusiasts.

Custom PC Issue 204 is available now at the usual stockists, or online with global delivery from the official website.

Custom PC, Issue 203

Custom PC Issue 203This month’s Hobby Tech column opens with a look at how the maker and hacker communities are rallying behind the COVID-19 crisis, puts the Rock Pi N10 Model A computer-on-module on the test bench, and takes a look at Imagine That!, the story of APF engineer Ed Smith and his work on the Imagination Machine home computer.

First, the opening spread. The world is still struggling to adjust to a “new normal” in the face of the continuing spread of SARS-CoV-2 and the COVID-19 disease it causes, and nowhere is that more obvious than here in the UK. While many countries have been able to flatten the curve sufficiently to avoid overwhelming healthcare resources, there is still concern over a second wave – and that’s why makers and tinkerers around the world have volunteered their expertise and enthusiasm.

The spread looks at a range of projects currently underway across the globe, from open-source ventilators designed as emergency alternatives to under-stocked invasive ventilators used as a last-ditch treatment for COVID-19 sufferers to homebrew face masks and face shields. Links to each project are included, for anyone looking to get involved.

The Rock Pi N10 Model A is a traditional hardware review: two pages on the computer-on-module. Based on the Rockchip RK3399Pro system-on-chip with integrated neural network co-processor, the entry-level Model A includes 4GB of LPDDR3 memory and 16GB of storage plus PCI Express connectivity for external hardware – a rarity on devices at its price point.

Finally, Ed Smith’s autobiography Imagine That! rounds out the piece. A self-published book, via Amazon’s print-on-demand service, Imagine That! impressed and disappointed in equal measure. For those looking for technical details on Smith’s involvement in APF’s Imagination Machine home computer, it’s a disappointment; for those looking for information on what it was like to be a black engineer growing up in the Browsnville projects in the 1970s there’s plenty of meat in its relatively scant 140 pages.

It’s a topic worthy of publication, but one which will hopefully see enough success to warrant a second edition through a professional publishing house: Smith’s honest storytelling approach is refreshing but scattershot, and riddled with typographical, grammatical, and factual errors begging for an editorial pass, as are the low-resolution and uncredited images sprinkled throughout.

All this, and more, can be found in Custom PC Issue 203, available to buy with worldwide delivery from the official website.