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• 12:08, 13 November 2024 Philip talk contribs changed group membership for Greg-Brougham from (none) to Editor
• 12:01, 13 November 2024 Philip talk contribs set the upload from Wed, 30 Oct 2024 10:01:44 GMT as the approved revision for "File:Pico-christmas-light2.jpg"
• 12:00, 13 November 2024 Philip talk contribs set the upload from Wed, 30 Oct 2024 09:59:31 GMT as the approved revision for "File:Pico-christmas-light.jpg"
• 11:53, 13 November 2024 Philip talk contribs set 11199 as the approved revision for "Case Studies"
• 19:38, 1 November 2024 Philip talk contribs created page Glossary:Cover A/B/C/D (Created page with "The main external covers of a typical laptop are sometimes referred to in service manuals and by vendors of spare parts as Cover A: The back of the laptop screen (outer lid); Cover B: The bezel around the screen; Cover C: The palm rest, keyboard area and touchpad; Cover D: The bottom panel, generally giving access to internal components.")
• 16:32, 14 October 2024 Philip talk contribs set the upload from Mon, 14 Oct 2024 16:32:36 GMT as the approved revision for "File:Laptop lid fracture repair.jpeg"
• 16:32, 14 October 2024 Philip talk contribs created page File:Laptop lid fracture repair.jpeg (An incipient facture in the lid of a laptop from hinge strain, fixed with a piece of firebreglass board.)
• 16:32, 14 October 2024 Philip talk contribs uploaded File:Laptop lid fracture repair.jpeg (An incipient facture in the lid of a laptop from hinge strain, fixed with a piece of firebreglass board.)
• 08:26, 8 October 2024 Philip talk contribs moved page Glossary:Razor-ans-blades business model to Glossary:Razor-and-blades business model without leaving a redirect
• 08:26, 8 October 2024 Philip talk contribs created page Glossary:Razor-ans-blades business model (Created page with "The razor-and-blades business model is the pricing strategy in which a basic commodity is sold cheaply but then needs to be serviced by expensive consumables. Current examples include printers and printer ink, coffee machines and coffee pods, games consoles and games, and mobile phones and usage contracts. The model is often attributed to Gillette, inventor of the safety razor, but was in fact introduced by his competitors.")
• 16:32, 7 October 2024 Philip talk contribs set the upload from Mon, 07 Oct 2024 16:32:24 GMT as the approved revision for "File:Image-of-a-screw-being-measured-with-digital-calipers.jpg"
• 16:32, 7 October 2024 Philip talk contribs uploaded a new version of File:Image-of-a-screw-being-measured-with-digital-calipers.jpg
• 16:42, 5 October 2024 Philip talk contribs created page Glossary:Q factor (Created page with "The Q (or quality) factor of a resonant system, such as a tuned circuit, a quartz crystal, a guitar string or a pendulam, is a measure of how free it is to resonate at its natural frequency. It can be defined in terms of the sharpness of the resonant frequency, or as the number of times greater the stored energy of the resonator is than the energy lost per vibration or cycle. For example, a tu...")
• 21:18, 3 October 2024 Philip talk contribs created page Glossary:SMR (Created page with "SMR or Shingled Magnetic Recording (as used in an SMR drive) is a method of increasing the recording density on a hard drive by writing each track so as to partially overlap the previous one, in the manner of roofing tiles (or shingles). This means that previously written data cannot be overwritten as it would partially overwrite both the previous and following data tracks. If data is updated it must be appended to the existing data, and either the disk controller or the...")
• 09:17, 3 October 2024 Philip talk contribs set the upload from Thu, 03 Oct 2024 09:17:55 GMT as the approved revision for "File:BSI-ASTA-NEMKO.png"
• 09:17, 3 October 2024 Philip talk contribs created page File:BSI-ASTA-NEMKO.png (Bsi Kitemark, ASTA diamond mark and Nemko N mark)
• 09:17, 3 October 2024 Philip talk contribs uploaded File:BSI-ASTA-NEMKO.png (Bsi Kitemark, ASTA diamond mark and Nemko N mark)
• 09:35, 1 October 2024 Philip talk contribs created page Glossary:Buffer overflow vulnerability (Created page with "A buffer overflow happens when a program is given more data (whether direct user input or from a network source) than will fit in the memory space that has been allocated for it. The extra may then overwrite nearby data causing unexpected behaviour, which may include an attacker being able to take over control of the program. Buffer overflows can be avoided by strict adherence to a cardinal rule of secure coding: thoroughly validate all input from potentially untrusted s...")
• 16:27, 30 September 2024 Philip talk contribs created page Glossary:Memory leak (Created page with "Sophisticated software such as a browser performs much of its work using small chunks of memory for temporary storage, borrowed from a pool. Sometimes, due to a bug, it may fail to return it to the pool when it's finished with it. This is known as a memory leak, and can result in the memory pool becoming depleted to the extent that the software can no longer operate. The only solution is to close and relaunch it.")
• 15:56, 23 September 2024 Philip talk contribs created page Glossary:Supply chain attack (Created page with "Modern hardware and software is generally composed of many different (hardware and software) components, some of these themselves composed of multiple sub-components. Keeping track of the provenance and trustworthiness of all of these can be an extremely difficult problem. Any of them might be compromised in a "supply chain" attack to compromise the integrity of a finished product. A classic example was the introduction of explosives into pagers and walkie-talkies suppli...")
• 15:41, 23 September 2024 Philip talk contribs moved page Watering hole attack to Glossary:Watering hole attack without leaving a redirect
• 14:00, 23 September 2024 Philip talk contribs created page Watering hole attack (Created page with "A watering hole attack is an attempt to compromise a target organisation or individual by first compromising a website or online resource that they are known or suspected to use (their "watering hole"). In this way, for example, the attacker may hope to gain access to a well defended defence contractor though one of its less secure suppliers.")
• 08:44, 23 September 2024 Philip talk contribs created page Glossary:Side channel attack (Created page with "A side channel or covert channel attack is one which exploits some side-effect of the processing, transmission or storage of data to draw inferences about the data itself. For example, unless carefully designed, observing how the power consumed by a processor while encrypting data can leak informaion, ultimately leading to discovery of the encryption key.")
• 20:56, 20 September 2024 Philip talk contribs created page Fixing Laptop Hinges (Created page with "When a laptop screen comes off in your hand (or feels like it might), this page will help... <div class="showtoc"> __TOC__ </div> ==Summary== All pages should start with a summary, to enable the reader to see at a glance what the page is about and whether it is likely to give the information required. This is subtly different from the description of the page's purpose, given above. Retaining the basic structure, replace all the text of this page with your own content....")
• 20:51, 12 September 2024 Philip talk contribs changed group membership for Lee-Grant from (none) to Editor
• 09:56, 30 August 2024 Philip talk contribs created page Glossary:Speculative execution (Created page with "High performance CPUs use multiple logic blocks in order to perform as much work as possible in parallel. So for example, if a CPU is required to process a list of ten items it might start to "speculatively execute" the processing of an 11th before it has been able to determine that it has completed the list. Even though this wasted effort has to be discarded, a net performance improvement can be achieved.")
• 09:16, 30 August 2024 Philip talk contribs created page Glossary:Cache (Created page with "A cache is a small and very fast block of memory used to hold immediate working data or frequently used instructions from a computer program.") Tag: Visual edit: Switched
• 11:19, 29 August 2024 Philip talk contribs created page Glossary:PEBKAC (Created page with "Problem Exists Between Keyboard And Chair (or a variant) is an expression sometimes used by computer experts and support staff to indicate that a problem lies with a user rather than the computer system. It should be used sparingly and with caution as it can cause offence, also bearing in mind that the real source of the problem might often be shortcomings in the usability of the system or opaque documentation.")
• 10:21, 28 August 2024 Philip talk contribs created page Glossary:Floating Point (Created page with "Many of the numbers a computer deals with are whole numbers (integers) which can be easiy represented in binary, but real world numbers can span a huge range of sizes. Floating point is a method of representing such numbers in two parts: a mantissa represents the significant digits and an exponent tells you where the decimal point comes (or the binary point for binary numbers). This is similar to the scientific notation in which one and a half million...")
• 10:06, 28 August 2024 Philip talk contribs created page Glossary:RISC-V (Created page with "RISC-V (pronounced Risk Five) is a RISC computer architecture with its roots in an academic design at Berkley. There are 32 and 64 bit variants of the basic design and numerous optional extensions giving additional instructions for different data types and types of operation. Unlike ARM, the design is completely open source.")
• 09:41, 28 August 2024 Philip talk contribs created page Glossary:ARM (Created page with "ARM, or Advanced RISC Machines is a computer architeture designed for low cost and low power consumption. It is used in huge numbers of smartphones but equally, supercomputers have been built using large swarms of them. It was first introduced in 1985 by Acorn Computers (also known for their BBC Micro) but it has since gone through several generations. The design is owned by Arm Ltd who licence it to...")
• 09:01, 28 August 2024 Philip talk contribs created page Glossary:RISC (Created page with "RISC or Reduced Instruction Set Computer is a computer architecture in which the basic machine instructions are very simple and so can be implemented cheaply. Although more instructions may be needed for a given task, they can be made to run very fast and the silicon saved can be used for other optimisations such as large cache memories to speed up execution. The result can be a significant net gain in performance. ARM is the most widely used example of...")
• 08:43, 28 August 2024 Philip talk contribs created page Glossary:CISC (Created page with "CISC or Complex Instruction Set Computer is a computer architecture in which the basic machine instructions are generally fairly complex and highly functional, however, this means that they are relatively expensive to implement. By comtrast, the RISC or Reduced Instruction Set Computer architecture was developed to optimise performance in other ways.")
• 08:04, 28 August 2024 Philip talk contribs created page Glossary:Instruction set (Created page with "The instruction set of a computer is the repertoire of fundamental low-level machine istructions used to program it. Different computer architectures such as x86, ARM and RISC-V have different incompatible instruction sets.")
• 08:00, 28 August 2024 Philip talk contribs created page Glossary:Assembler (Created page with "Assembly code or assembler is a direct one-to-one representation of the fundamental binary instructions used by a computer, in human-readable form. Instruction codes are written as mnemonics such as ADD and MOV, and storage locations holding the data are given names chosen by the programmer.")
• 20:52, 28 July 2024 Philip talk contribs created page Glossary:Horology (Created page with "Horology is the theory and practice of timekeeping and clock-making.")
• 13:46, 23 July 2024 Philip talk contribs set the upload from Tue, 23 Jul 2024 13:46:04 GMT as the approved revision for "File:Sounding Chinese incense clock.jpg"
• 13:46, 23 July 2024 Philip talk contribs created page File:Sounding Chinese incense clock.jpg (This clock depends on the (fairly) constant rate of burning of a incense stick, placed beneath the strings holding the weights. The strings are burnt through it turn, causing the weights to drop onto the metal plate, giving an audible indication of the passage of time. (This example is on display in the Museum of Timekeeping, https://www.museumoftimekeeping.org.uk))
• 13:46, 23 July 2024 Philip talk contribs uploaded File:Sounding Chinese incense clock.jpg (This clock depends on the (fairly) constant rate of burning of a incense stick, placed beneath the strings holding the weights. The strings are burnt through it turn, causing the weights to drop onto the metal plate, giving an audible indication of the passage of time. (This example is on display in the Museum of Timekeeping, https://www.museumoftimekeeping.org.uk))
• 19:25, 27 June 2024 Philip talk contribs set 11075 as the approved revision for "Batteries"
• 19:24, 27 June 2024 Philip talk contribs set 11074 as the approved revision for "Batteries"
• 21:15, 25 June 2024 Philip talk contribs created page Glossary:Phono plug (Created page with "A phono or RCA connector is a type of coaxial connector commonly found in audio and video equipment. It is characterised by a central pin which protrudes from the cylindrical shell. Different colours are used to denote different audio or video applications.")
• 21:06, 25 June 2024 Philip talk contribs created page Glossary:BNC (Created page with "BNC is a type of professional quality coaxial cable twist-to-lock connector, very commonly used for high frequency applications such as in radio, video and testing.")
• 20:55, 25 June 2024 Philip talk contribs created page Glossary:S/PDIF (Created page with "S/PDIF (Sony/Philips Digital Interface) is a standard for encoding digital audio for transmission using optical fibre using TOSLINK connectors or coaxial cable using phono or BNC connectors.")
• 20:45, 25 June 2024 Philip talk contribs created page Glossary:TOSLINK (Created page with "TOSLINK (from TOShiba LINK) is a method of connecting audio devices such as CD players and amplifiers using optical fibre and optical connectors. These are immune to interference and ground loops, unlike copper connections. Audio is transmitted digitally. S/PDIF is the standard which defines how it is encoded.")
• 08:44, 24 June 2024 Philip talk contribs created page Glossary:3-Terminal Regulator (Created page with "A 3-terminal regulator is a device which takes an unregulated input voltage and produces a constant well-defined output voltage. It has just 3 connections (or terminals: the input, the output and a common ground. The 78/79 seriesintegrated circuits are a very common example. 78 devices take positive input and output whereas 79 series take negative. Two further digits in the type code indicate the voltage, for example 780...")
• 21:25, 21 June 2024 Philip talk contribs created page Glossary:POTS (Created page with "POTS or Plain Old Telephone System refers to the legacy analogue telephone system carried over copper wires.")
• 21:25, 21 June 2024 Philip talk contribs created page Glossary:PSTN (Created page with "PSTN or Public Switched Telephone Network is the global switched telephone network. Unlike the Internet in which data is transmitted as independant packets, connections between subscribers are made and taken down as required.")
• 21:07, 21 June 2024 Philip talk contribs created page Glossary:SOGEA (Created page with "SOGEA or Single Order Generic Ethernet Access is essentially the same as a FTTC Internet connection except that no old-fashioned anlogue telephone service is delivered over the copper segment from the street cabinet to the customer premises. This makes it cheaper. Voice calls can still be made, but they are carried digitally over the broadband connection.")
• 20:53, 21 June 2024 Philip talk contribs created page Glossary:FTTC (Created page with "FTTC or Fibre To The Cabinet (Part-Fibre) is a broadband Internet connection delivered through optical fibre only to a street cabinet, and copper wires for the remainder to the customer premises, as opposed to the faster FTTP which is fibre all the way.")

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