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If the 92 weren't so huge =) At least you can fake carrying around a 89 without looking like you're carrying a small laptop. If you wanted a QWERTY keyboard, get one of those small Sony Viao's and put Maple, Matlab, etc on it. I understand there's a huge price difference between the two, so this isn't a suggestion most people would go for, but for the size, you're better off with a small laptop with some powerful math software on it.
I also believe a small solar power calulator is also essential to have with you too. Something simple (Casio actually made a nice one about 5 or 6 years ago, that served me very well). Sometimes you just need to do a few simple calculations, and its incredibly silly to take out a huge monster. Also, when the batteries run out, a backup is always nice to have.
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-- "Spread before you is your soul, so forever hold the dreams within your hearts. Through nature's inflexable grace, I'm learning to live" - DT
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