The Psion organiser is a small hand‐sized computer about the size of a (thick) pocket diary. Despite its size, it is a complete computer by any reasonable definition, with processor, 16–32Kbyte memory, operating system, programming language, resident software, and the ability to communicate with peripherals such as printers and light pens, as well as with other microcomputers. The resident programs are an electronic diary, a personal database system, a calculator, a clock, an alarm facility and a programming facility. The programming facility allows programs to be created, edited, saved, compiled and inserted into the main menu in such a way that they may be run with a single keystroke.
Nicholson, D. (1988), "Applications of the Psion organiser at Strathclyde University Library", Program: electronic library and information systems, Vol. 22 No. 4, pp. 391-398. https://doi.org/10.1108/eb047011Download as .RIS
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