Ampere WS-1 Japanese APL Clamtop

Different Ampere, not the ARM CPU people.

See also the MCM/70, which also runs APL, and happens to be the world's first portable computer: https://en.wikipedia.org/wiki/MCM/70

Came here to mention this. I saw one around 1985: our numerical methods professor had one but we did our homework on a DEC-20 with a "proper" LA36 terminal with APL font and keycaps.

Wonderful course, taught in APL from the Red Book. Every example and homework was a one-liner. This is why a machine with a one-line LED display was even feasible in practice. And those little cassette tapes probably held a ton of programs.

Try it online at https://blazorcanvas20210704221924.azurewebsites.net/mcmpoc

Let me guess: Freddy Way at CWRU?

Wow that's a beautiful machine.