To compare "real" interactive fiction (IF) with the "choose your own adventure" type books is like comparing a toy car with a Formula 1 Grand Prix car
.
IF started in the early 1980s with the "Infocom" type games ("Zork", etc), and continues to have a wide following. Many extremely sophisticated games have been written which "blow away" those early Infocom games in terms of both richness of content and complexity.
Most IF games are written using the "virtual machine" environment called "Z-code" originally developed for "Zork", and there are Z-code interpreters available for pretty much every handheld and desktop machine around, including a port of it for the iRex iLiad. It would be great to have a version for the PRS-700.
For more details about IF, see the
Interactive Fiction Archive site.