In early 1983, Sinclair approached Psion regarding the development of a suite of office applications for the forthcoming Sinclair QL personal computer. Psion were already working on a project in this area and the QL was launched in 1984, bundled with Quill, Archive, Abacus and Easel; respectively a word processor, database, spreadsheet, and business graphics application. These were later ported to DOS and were made available for the IBM PC and ACT Sirius and Apricot computers, collectively called PC-Four, or Xchange[10] in an enhanced version.

— Fuente: https://en.wikipedia.org/wiki/Psion_(company)