A foremost version of EPOC, Release One appeared on the Psion Series 5 ROM v1.0 around 1997. Late, ROM v1.Ace featured Release Three (Release Two was never publicly available. These were followed per Series 5mx, Revo / Revo plus, Series 7 / netBook and netPad (which totally featured Release Five).

EPOC occurs as pre-emptive multitasking, single user operating body by owning memory protection, which encourages a application creator to separate their program into an engine & an interface. the Psion line of PDAs accompany a graphical user interface called EIKON which is specifically tailored for handheld machines with the keyboard (so shopping peradventure supplementary similar to desktop GUIs than palmtop GUIs). Notwithstanding, one of EPOC's characteristics is the easily sustaining which fresh GUIs may be developed according to the core placed of GUI classes, the feature which has been widely explored from either Ericsson R380 & onward.

EPOC was originally developed for a ARM personal of processes, including the ARM7, ARM9, StrongARM & Intel's XScale, however may be compiled towards target equipment applying many more processor types.

When you took a development of EPOC, Psion planned to license EPOC to third-person device manufacturers, & span off its computer Programs section when Psion Software. One of a 1st licencee was a short-passing Geofox, which halted production by having to a lesser degree 1,000 units sold. Ericsson marketed a rebranded Psion Series 5mx known as a MC218, & late created the EPOC Release Five.Ace depending smartphone, the R380. Oregon Scientific also released a budget EPOC device, the Osaris (notable as a exclusively EPOC device to ship by owning Release Four).

Inside June 1998, Psion Software became Symbian, a major joint venture between Psion & phone manufacturers Ericsson, Motorola, and Nokia. When of Release 6, EPOC became known only when Symbian OS.

EPOC16

EPOC16 is the unofficial title for the operating models utilized inside Psion's "SIBO" equipment, which preceded EPOC32. Altogether EPOC16 gear feature an 8086-family processor & the 16-bit architecture. SIBO equipment include a: MC200, MC400, Series 3, Series 3a, Series 3c, Series 3mx, Siena, Workabout and Workabout mx. A MC200, a 1st EPOC16 device, shipped within 1989, and when of November 2004, the [http://www.psionteklogix.com/public.aspx?s=com&p=Products&pCat=128&pID=1631 Workabout mx] is however around production.

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