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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