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BTW, you might be possibly also interested in http://en.wikipedia.org/wiki/Fossil_Wrist_PDA
But what I will hunt down, one day... http://www.handheldmuseum.com/Nelsonic/Tetris.htm
Or wristwatch tamagotchi http://www.ggdb.com/GameByManufacturer.aspx?c=Handheld&s=Watch&m=Ne...
Seems actually the most useful (as far as one can say that about a game) addition to the standard wristwatch formula, anything much more "sophisticated" doesn't really work out "practical and useful" - it appears to be the wrong & too miniature form-factor for complex functionality.
PS. Nice list from Wiki http://pocketcalculatorshow.com/nerdwatch/fun2.html ...and it seems that the keyboard also requires a battery? Plus, there are some hints there for troubleshooting, also with communication issues.
PPS. (from http://en.wikipedia.org/wiki/Nelsonic_game_watch )
"Melody Car Racing
Came with a separately detachable Nelsonic brand 5×15mm monocular to aid in viewing the small screen." - SO EPIC... 0_0
The game was also released under the name Star Trek II: The Wrath of Khan [...] and the layout was used in the pornographic Sexum Watch (another third party release)." - space battles / Star Trek: a lot like porn! Edited 2012-07-10 01:16 UTC
Thanks for the links!
I'll check them out later as I'm on my iPhone. My wife keeps claiming MY iPad.
Calling them just "phone" and "tablet" also does the trick (and even more, avoiding some things, some kinds of image). It really does...