The first thing I ever tried to program. HELLO WORLD type things took me hours of reading through manuals and punching numbers in, and figuring out how to save them on strips. The screen was only numeric, so alpha output went only to the printer, if I recall. It would be another year or so before dad got out first PET 2001.
https://www.zdnet.com/pictures/10-awesome-handheld-computers-from-yesteryear/2/ #TI59