TRS-80 Model 100 was released in 1983 and was supposed to be quite popular: http://www.oldcomputers.net/trs100.html http://www.oldcomputers.net/trs100.html It

TRS-80 Model 100 was released in 1983 and was supposed to be quite popular: http://www.oldcomputers.net/trs100.html http://www.oldcomputers.net/trs100.html It got 16 hours of runtime on four AA batteries. Way before my time, but I got to play around with one in 2000 and really liked the form factor. There were also glorified calculators like the 1980 TRS-80 PC-1 (https://www.old-computers.com/museum/computer.asp?c=937&st=1 https://www.old-computers.com/museum/computer.asp?c=937&st=1). Never used that particular model, but that style of keyboard/display in a palmtop computer is not very ergonomic IMO. There is a list of 1980s portables on Wikipedia: https://en.wikipedia.org/wiki/Timeline_of_portable_computers https://en.wikipedia.org/wiki/Timeline_of_portable_computers That list may look long, but it is probably far from complete. For example, at the 2017 VCF PNW I got to play with a 1980s "glorified calculator" Lisp machine handheld. Can't remember the manufacturer, but it is definitely not on that list, and the only reference I was able to find with a quick web search was this: https://en.wikipedia.org/wiki/Talk:Lisp_machine#Sony_and_Lisp https://en.wikipedia.org/wiki/Talk:Lisp_machine#Sony_and_Lis... So there were a lot more portable computers around in the 1980s than you suspect.