Yah. I had one of those. A Panasonic Sr. Parter. It had a 10" green CRT, a FULL-sized keyboard (not those teensy things they call full-sized nowadays), a 10 meg hard drive, a 5.25" floppy drive, AND (drum roll) a thermal printer -- all built into one easy-to-carry 40 pound package! It also had a couple of slots that would take full-sized cards built into the chassis. I managed to stuff a "hardcard" (hard drive on a card) into one of the slots. The card was massive. There were LOTS of desktop systems back then that would not have accommodated it.
More to the point of the thread -- I can't think of any recent notebook / laptop that can take a PCI card. Some of the old orange plasma screen Toshibas could do it. You might want to look for a lunch box portable. Many of those can take cards, though the internal dimensions of most, if not all, of these computers would preclude use of a really long card.
- Collin