I didn't have a portable computer when I was a kid, but my dad was awesome and bought me (well, the family, really) a "portable" BROTHER word processor.
It was totally modeled after the portable computers (monochrome, yellow, 6-9" screeen, fold-up fullsize keyboard, 3 1/2" floppy -- yes! that was considered an upgrade from the older model's 5 1/4" drive, DAISYWHEEL printer - have you ever experienced the speed and noise of a daisywheel? - etc. etc.)
Anyway, I loved that word processor and used it well into the early 90's (I got it in the mid- to late- 80's).
Considering how expensive computers and printers were at the time, the Brother was actually a very good alternative.
Oh yeah. One little thing: I wrote TurboGrafx-16 rap lyrics on that bad boy.