EPOC (computing)

EPOC is a family of operating systems developed by Psion for portable devices, primarily PDAs. EPOC is rumoured to derive from "Electronic Piece Of Cheese", or from epoch - the beginning of an era.

EPOC16

EPOC16, originally simply named EPOC, is the operating system developed by Psion in the late 1980s and early 1990s for Psion's "SIBO" (SIxteen Bit Organisers) devices. All EPOC16 devices feature an 8086-family processor and a 16-bit architecture. EPOC16 is a single-user pre-emptive multitasking operating system, written in Intel 8086 assembler language and C and designed to be delivered in ROM. SIBO devices include the: MC200, MC400, Series 3, Series 3a, Series 3c, Series 3mx, Siena, Workabout and Workabout mx. The MC400 and MC200, the first EPOC16 devices, shipped in 1989, and as of September 2007, the Workabout mx is still in production.

In the late 1990s the operating system was referred to as EPOC16 to distinguish it from Psion's new EPOC32 OS.

EPOC32, Symbian OS

The first version of EPOC32, Release 1 appeared on the Psion Series 5 ROM v1.0 in 1997. Later, ROM v1.1 featured Release 3 (Release 2 was never publicly available.) These were followed by the Series 5mx, Revo / Revo plus, Series 7 / netBook and netPad (which all featured Release 5).

The EPOC32 operating system, at the time simply referred to as EPOC, was later renamed Symbian OS. Adding to the confusion with names, before the change to Symbian, EPOC16 was often referred to as SIBO to distinguish it from the "new" EPOC. Despite the similarity of the names, EPOC32 and EPOC16 were completely different operating systems, EPOC32 being written in C++ from a new codebase with development beginning during the mid 1990s.

EPOC32 is a pre-emptive multitasking, single user operating system with memory protection, which encourages the application developer to separate their program into an engine and an interface. The Psion line of PDAs come with a graphical user interface called EIKON which is specifically tailored for handheld machines with a keyboard (thus looking perhaps more similar to desktop GUIs than palmtop GUIs). However, one of EPOC's characteristics is the ease with which new GUIs can be developed based on a core set of GUI classes, a feature which has been widely explored from Ericsson R380 and onwards.

EPOC32 was originally developed for the ARM family of processors, including the ARM7, ARM9, StrongARM and Intel's XScale, but can be compiled towards target devices using several other processor types.

During the development of EPOC32, Psion planned to license EPOC to third-party device manufacturers, and spin off its software division as Psion Software. One of the first licensees was the short-lived Geofox, which halted production with less than 1,000 units sold. Ericsson marketed a rebranded Psion Series 5mx called the MC218, and later created the EPOC Release 5.1 based smartphone, the R380. Oregon Scientific also released a budget EPOC device, the Osaris (notable as the only EPOC device to ship with Release 4).

In June 1998, Psion Software became Symbian, a major joint venture between Psion and phone manufacturers Ericsson, Motorola, and Nokia. As of Release 6, EPOC became known simply as Symbian OS.
An operating system (OS) is the software that manages the sharing of the resources of a computer. An operating system processes system data and user input, and responds by allocating and managing tasks and internal system resources as a service to users and programs of the
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Psion PLC is a consumer hardware company mostly known for developing the Psion Organiser as well as a whole range of more advanced, clamshell-design Personal Digital Assistants.
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Personal digital assistants (PDAs) are handheld computers, but have become much more versatile over the years. PDAs are also known as pocket computers or palmtop computers.
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Intel 8086
Central processing unit

Produced: From 1978-79 to 1982
Manufacturer: Intel
CPU Speeds: 4.
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16-bit integers, memory addresses, or other data units are those that are at most 16 bits (2 octets) wide. Also, 16-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size.
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The Psion 3 range of personal digital assistants were made by Psion PLC. The four main variants are the Psion 3 (1991), the Psion 3a (1993), the Psion 3c (1996), and the Psion 3mx (1998), all sized 165 x 85 x 22 mm.
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19th century - 20th century - 21st century
1950s  1960s  1970s  - 1980s -  1990s  2000s  2010s
1986 1987 1988 - 1989 - 1990 1991 1992

Year 1989 (MCMLXXXIX
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September 2007 is the ninth month of that year. It began on a Saturday and 30 days later, ended on a Sunday.

International holidays

  • September 3 - Labor Day (United States, Canada)
  • September 4 - Krishna Janmaashtami (India)

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The Psion Series 5 is a PDA from Psion. It comes in two main variants, the Series 5 (launched in 1997) and the Series 5mx (1999), the latter having a faster processor, clearer screen, and updated software.
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The Psion Revo is a PDA from Psion. It is the light version of Psion 5mx. It is software-compatible with the 5mx and has the same processor but is more lightweight (200g vs 354g of 5mx), and substantially smaller (157x79x17mm).
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The Psion 7 is a notebook computer from Psion that was released in 2000. In size it is fairly original - larger than a palmtop or handheld machine, but smaller than a laptop computer. It was the first of the Psion series to have a full color screen - and the last.
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Pre-emption as used with respect to operating systems means the ability of the operating system to preempt or stop a currently scheduled task in favour of a higher priority task. The scheduling may be one of, but not limited to, process or I/O scheduling, among others.
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The user interface (or Human Machine Interface) is the aggregate of means by which people (the users) interact with a particular machine, device, computer program or other complex tool (the system).
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graphical user interface (GUI) is a type of user interface which allows people to interact with a computer and computer-controlled devices which employ graphical icons, visual indicators or special graphical elements called "widgets", along with text, labels or text
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The Ericsson R380 was a GSM mobile phone made by Ericsson, released in 2000. It was the first phone to use the new Symbian OS, running version ER5U (Symbian OS version 5, unicode).

It was a black and white device with a touchscreen, partially covered by a flip.
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The ARM architecture (previously, the Advanced RISC Machine, and prior to that Acorn RISC Machine) is a 32-bit RISC processor architecture developed by ARM Limited that is widely used in a number of embedded designs.
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Strongarm

Literally

Holding someone's arm behind their back to achieve compliance.

Metaphorically

Using strength (physical or otherwise) in an attempt to achieve one's goals instead of using other more tactful methods.
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The XScale, a microprocessor core, is Marvell's (formerly Intel's) implementation of the fifth generation of the ARM architecture, and consists of several distinct families: IXP, IXC, IOP, PXA and CE (see more below). The PXA family was sold to Marvell Technology Group in June 2006.
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Telefonaktiebolaget L. M. Ericsson

Public (NASDAQ:  ERIC , )
Founded Stockholm, Sweden (1876)
Headquarters Stockholm,Sweden

Key people Michael Treschow, Chairman
Carl-Henric Svanberg, President and CEO
Industry Telecommunications
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smartphone is a mobile phone offering advanced capabilities beyond a typical mobile phone, often with personal computer like functionality. There is no industry standard definition of a smartphone[1][2].
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Oregon Scientific, Inc.

Subsidiary
Founded 1989, Portland, Oregon
Headquarters Tualatin, Oregon,
United States

Key people Michael Prager, President
Industry consumer electronics
Products cameras, clocks
Employees 80 (2006)[1]
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Osaris is a personal digital assistant (PDA) featuring the EPOC operating system distributed by Oregon Scientific.

The Osaris was released in 1999, and at the time priced at £219.99-£279.99. The Osaris contains a CL-PS7111, 18.
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19th century - 20th century - 21st century
1960s  1970s  1980s  - 1990s -  2000s  2010s  2020s
1995 1996 1997 - 1998 - 1999 2000 2001

Year 1998 (MCMXCVIII
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Symbian OS is a proprietary operating system, designed for mobile devices, with associated libraries, user interface frameworks and reference implementations of common tools, produced by Symbian Ltd. It is a descendant of Psion's EPOC and runs exclusively on ARM processors.
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Telefonaktiebolaget L. M. Ericsson

Public (NASDAQ:  ERIC , )
Founded Stockholm, Sweden (1876)
Headquarters Stockholm,Sweden

Key people Michael Treschow, Chairman
Carl-Henric Svanberg, President and CEO
Industry Telecommunications
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Motorola Inc.

Public (NYSE: MOT )
Founded 1928
Headquarters Schaumburg, Illinois, USA

Key people Edward Zander, CEO & Chairman
Industry Telecommunications
Products Embedded systems
Microprocessors
Mobile phones
Two-Way radios
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Nokia Corporation

Public – Oyj
(, NYSE:  NOK , FWB: NOA3 )
Founded Nokia, Finland (1865)
Headquarters Espoo, Finland

Key people Fredrik Idestam, Founder in 1865
Kari Kairamo, CEO in the 1980s
Olli-Pekka Kallasvuo, President & CEO
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Symbian OS is a proprietary operating system, designed for mobile devices, with associated libraries, user interface frameworks and reference implementations of common tools, produced by Symbian Ltd. It is a descendant of Psion's EPOC and runs exclusively on ARM processors.
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