EPOC is a mobile operating system developed by Psion, a British company founded in 1980.
It began as a 16-bit operating system (OS) for Psion's own x86-compatible devices, and was later replaced by a 32-bit system for x86 and ARM.
EPOC16 (16-bit):
- Psion Organiser II LZ/LZ64 (1986)
- Psion Organiser II XP (1986)
- Psion Organiser II CM (1986)
- Psion Organiser II LAM (1987)
- Psion MC200 (1989)
- Psion MC400 (1989)
- Psion HC (1990)
- Psion Series 3 (1991)
EPOC32 (32-bit):
EPOC Release 1:
- Psion Series 3 (1991) - Later models
- Psion Series 3a (1993)
- Psion Series 3c (1996)
- Psion Series 3mx (1998)
EPOC Release 3:
- Psion Siena (1996)
EPOC Release 5:
- Psion Series 5 (1997)
- Psion Series 5mx (1999)
- Psion Revo (1999)
- Psion Revo Plus (2000)
- Psion Series 7 (1999)
- Psion netBook (2000)
- Ericsson MC218 (1999)
- Diamond Mako (2000)
- Geofox One (1999)
Release 5.1 (also known as ER5u):
- Ericsson R380 (2000)
- Ericsson R380s (2001)
- Ericsson R380e (2001)
Psion to Symbian Ltd. transition: In June 1998, Psion Software became Symbian Ltd., a major joint venture between Psion and phone manufacturers Ericsson, Motorola, and Nokia.
Sony and Ericsson joint venture: On October 1, 2001 a joint venture company – Sony Ericsson Mobile Communications has been established by a Japanese electronics company Sony Corporation and Swedish telecommunications company Ericsson.
Releases 2 and 4: There were no publicly released devices running EPOC Release 2 or Release 4. These were internal development versions that bridged the gaps between major public releases.