Texas Instruments TI-40 Solar

Description

Brand:	Texas Instruments
Model:	TI-40 Solar (Second edition)
Type:	Scientific calculator
Picture:
Batteries:	Solar cell
Lifetime:	Introduced: 1998 Terminated: unknown
Notes:	This calculator is functionally similar to the TI GALAXY 40x. There are two versions of this calculator, one with a rather square design, and this one with rounded edges and rounded keys. This calculator has many nice functions, including grouped functions to operate on fractions, and a nicely big backspace key. The OP1 and OP2 keys provide a form of semi-programmability. For instance, when you want to add the number "13/2" to a series of other numbers, simply type + 1 3 ÷ 2 OP1. Now, when you type 5 OP1, the result will be the outcome of "5 + 13/2". Thanks, Koen van Driessen for this information. A peculiarity, inside on the circuit board of this calculator, there’s a LED. This LED operates as a zener diode to regulate the solar cell’s power output (thanks Joerg Woerner).