"The HP49G is Hewlett-Packard's latest graphic calculator. It has 512K of RAM (split into two 256KB ports: Port 0 and Port 1) and 2MB of flash memory. 1MB of flash memory is used by the upgradeable ROM and the other 1MB is available to the user (in Port 2). It has the same 4 MHz Saturn CPU as the 48G series, but the software is rewritten to make the calculator operate more quickly."
Apparently according to Wikipedia this specific type was introduced in 1999 and discontinued in 2003. [2]
Not sure how popular this specific type was. Personally (ie. my bubble), I used a TI (I forgot the exact type, likely TI-83) and this was more or less mandated by the school (used for mathematics, physics, chemistry, biology, computer science, and ehh.. "notes"..). If you had a different type you were on your own. From what I remember they were programmable, and you could install software on them as well. I guess I'd expect "that other" text editor before Emacs though wink.
Question to fellow readers: what do teenagers use these days on high school? Do they still use graphic calculators? Or is this niche overtaken by say tablets or smartphones? Please do state your country/state.