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Re:Gemini PDA: 20 years on, meet the all-new Psion Series 5 by jecel on Friday December 01, 2017 @11:23AM (#15824822)
Even the lightest old APL computers I am familiar with, the Ampere WS-1 (Japan 1985) and the MCM 70 (Canada 1974), were giants compared to the Psion 5.

http://www.old-computers.com/museum/computer.asp?c=66 http://www.old-computers.com/museum/computer.asp?c=346

I am pretty sure you weren't thinking of the IBM 5100.

Re:Gemini PDA: 20 years on, meet the all-new Psion Series 5 by protomyth on Friday December 01, 2017 @05:17PM (#15828195)
The Ampere WS-1 strikes me as familiar but I thought it was much smaller than that. Nice find.