more modern, smoothed design. Currently the bottom of the TI-30 line, the Xa has a standard one-line, 10+2 digit display. The solar-powered eco RS model is available only in Europe. TI-30Xa Solar School Edition (2004): a modified version of the TI-30Xa, without the fraction buttons. This calculator is approved for Virginia State Testing. TI-30X IIS and TI-30X IIB (1998): added a two-line, scrollable display and a D-pad for navigating previous results. Solar/battery and battery powered respectively. TI-30XS and TI-30XB MultiView (2005): first non-graphing TI calculators with a dot-matrix display; able to display expressions in textbook-style notation. Uses a command syntax similar to TI-BASIC, but with no programming capability. TI-30X Pro MultiView and TI-36X Pro (2011): In addition to the features TI-30XS and TI-30XB MultiView, it features a solver, availability to calculate matrices, vectors, complex numbers and convert different units. The TI-36X Pro is the American and international version of the European model, the TI-30X Pro MultiView. The TI-30X Pro MultiView was released in 2010 and then promptly recalled because of programming errors. It was re-released in 2011. TI-30XA (2013): retained the size and shape of the 1996 model, having buttons rounded on the bottom, and the color of the "2nd" button changed from yellow to green. With introduction of a new circuit board in 2015 the logarithm bug was fixed, also the calculator switched to using just one 1.5V battery instead of two. TI-30X Plus MultiView (2015): a TI-30X Pro MultiView without certain advanced features. Only released in Germany, Austria, and Switzerland to meet the requirements of certain high schools that ban the removed features. TI-30X Pro MathPrint™ and TI-30X Plus MathPrint™ (2018): successors of TI-30X Pro MultiView/TI-36X Pro and TI-30X Plus MultiView. Both have a modern design, a higher resolution display and some other improvements. References Datamath Calculator Museum: TI-30, 25th anniversary Photo-realistic TI-30 emulator External links The Great International Math on Keys book is a problem-solving guide exemplifying usage of electronic calculators, in particular TI-30 with Algebraic Operating System, developed by the staff of the Texas Instruments Learning Center in cooperation with the staff of the University of Denver Mathematics Laboratory in 1976. Texas Instruments calculators