I posted earlier about the Momenta Pen Computer, which debuted in 1991, when "pen computing" was all the rage.

https://news.ycombinator.com/item?id=21492195

>In 1991 when "pen computing" was all the rage, a start-up company called "Momenta" came out with a "pentop" MS-DOS based pen computer with a pie-menu-like "command compass", whose user interface was done in Smalltalk.

>Remember that this was in 1991, the same year Go Corporation finally released PenPoint, and a year before the 1992 founding of Palm Computing (which took over the Pen market for many years) and the release of Microsoft Windows 3.1 in 1992 (the first version of Windows that wasn't intolerably irritating), and the release of Microsoft Windows for Pen Computing in 1992 (which was a big flop). So there was a huge amount of excitement around pen computing.

[...and more about how their founder confused Smalltalk with Lisp, plus links to photos, reference manual excerpts, and more info about the Momenta pen computer...]