You could compare them to something like the Psion Series 3 (https://en.wikipedia.org/wiki/Psion_Series_3 https://en.wikipedia.org/wiki/Psion_Series_3), release

You could compare them to something like the Psion Series 3 (https://en.wikipedia.org/wiki/Psion_Series_3 https://en.wikipedia.org/wiki/Psion_Series_3), released in 1991. Possibly not common in America, though, as Psion was a UK company. Prior to the Series 3, Psion produced the Organizer (https://en.wikipedia.org/wiki/Psion_Organiser https://en.wikipedia.org/wiki/Psion_Organiser) - I had an Organizer II LZ64, bought in 1990 I think, a birthday present from my parents when I was a young teenager. These were a lot less practical than the Series 3, on account of the teeny tiny screen, but I found mine fun to program on.