Psion worked with its clients in the area of burgeoning technologies, including imaging, voice recognition, and radio-frequency identification (RFID).

Psion's games for the ZX Spectrum included Chess, Chequered Flag, Flight Simulation and the Horace series.

Psion were already working on a project in this area, and when the QL was launched in 1984 it was bundled with Quill, Archive, Abacus and Easel; respectively a word processor, database, spreadsheet, and business graphics application.

These were later ported to DOS and made available for the IBM PC and ACT's Sirius and Apricot computers, collectively called PC-Four, or Xchange[10] in an enhanced version.

[8] It is often rumoured that EPOC stands for "Electronic Piece Of Cheese" however Colly Myers, who was Symbian's CEO from founding until 2002,[13] said in an interview that it stood for 'epoch' and nothing more.

A second effort, dubbed Project Protea, produced the Psion Series 5 for sale in 1997, a completely new product from the 32-bit hardware upwards through the OS, UI, and applications.

However, the new feel of the product, and the removal of certain familiar quirks, alienated loyal Series 3 users, who tended to stick with their PDAs rather than upgrade.

The 32-bit EPOC developed by Project Protea resulted in the eventual formation of Symbian Ltd. in June 1998 in conjunction with Nokia, Ericsson and Motorola.

By 2007, the Symbian operating system powered around 125 million mobile phones, including many Nokia models and the Sony Ericsson P900 series.

Psion had previously sought to expand into mobile telephony itself, having engaged in talks to acquire Amstrad – mainly for its Dancall subsidiary – in 1996.

Other products failed or had limited success; these included Psion Siemens' GSM device, a Series 5 based set-top box, the Wavefinder DAB radio, and an attempt to add Dragon's speech recognition software to a PDA.

Psion had sold its sole manufacturing plant in 1999 and started to withdraw from its PDA markets in late 2001,[15] shedding 250 of 1,200 staff and writing-off £40 million.

[8] In its last years, Psion made tailored and customized modular variants of its products through its online community, Ingenuity Working.

Trademark 77,590,174 rejected 13 January 2009) Psion had a lengthy, but distant, interest in Linux as an operating system on its electronic devices.

In 2003–4, Psion Teklogix and its founder David Potter expressed interest in Linux as the operating system for its devices as it divested from Symbian.

[34][35][36] However, the only result of that interest was Linux as the operating system on a limited number of custom NetBook Pros designed for a hospital setting.