EPOC (computing)

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EPOC is a range of operating systems developed by Psion for portable devices, primarily PDAs. EPOC was rumoured to be an acronym for "Electronic Piece Of Cheese."

The first version of EPOC, 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).

EPOC 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.

EPOC 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 EPOC, Psion planned to license EPOC to third-party device manufacturers, and span 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.

EPOC16

EPOC16 is the unofficial name for the operating system used in Psion's "SIBO" devices, which preceded EPOC32. All EPOC16 devices feature an 8086-family processor and a 16-bit architecture. SIBO devices include the: MC200, MC400, Series 3, Series 3a, Series 3c, Series 3mx, Siena, Workabout and Workabout mx. The MC200, the first EPOC16 device, shipped in 1989, and as of November 2004, the Workabout mx is still in production.de:EPOC nl:EPOC sv:EPOC