There was no real reason for the original's silver top section to encase the first row of keys as if they were somehow special.
However it lacks much in the way of mathematical power - no logs, trig functions, powers/roots other than 2, etc.The user invoked the hyperbolic functions by entering the function argument and keygen nitro pdf pro 188.8.131.52 then pressing the "hyp" key, followed by the "sin "cos or "tan" function key.This unit is in great condition and works fine.Note that it uses button batteries.This is a Version 1, having the SR10 designation in the black plastic frame below the display.2 The SR-50 had very fast trig functions (about half a second to evaluate each function) and was a popular calculator to use in contests involving pocket calculators.TI 36 Solar A stylish and powerful light-powered calculator.Of special note, while this calculator used rechargeable NiCads, they were neither hardwired nor in a removable battery pack as with most other calculators.This is a very rare 1st version of the SR-51 that was only produced for a couple months.TI 82, tI 59 and PC 100A Printer.Hyperbolic trig arguments were always assumed to be in radians regardless of the setting of the degree/radian (D/R) mode switch.TI 59 and PC 100A Printer Here's something I can authoritatively tell you as a programmer for 35 years: you can't do it without paper.Just look at all the functions on this baby. I also have the manual for it, and a blemished case.It's a nice looking calculator, but has a terrible keyboard.But while it's logically an improvement I don't think it's as attractive.
HP would innovate and TI would replicate and add an extra couple features.
It can also be used to "echo" everything displayed on the calculator.