It was called Palm Pilot - the one pictured as the very first image in Wikipedia [1]. It still works, except for some bleeding/damage on a portion of the e-Ink screen. I probably need to find the appropriate Linux based tools to load the .PRC. I wonder if this [2] still works

[1] https://en.wikipedia.org/wiki/PalmPilot

[2] https://shallowsky.com/linux/palmlinuxdev.html