My dad got the family a Sharp ELSI 8107 with basic operations when I was a senior in high school.
The Calculator Museum is divided into several sections generally by manufacturer. LCD displays usually have black numbers against a silver background. I took two modern 1.2 volt AA rechargeable Ni-MH batteries and put them in a battery holder I got with a model electric car kit.My collection represents only a small fraction of TI calculators. Also, there may be some corrosion near the negative terminal on the circuit board itself. Click on Datamath - Internal Views for interior views of the three versions. I later acquired a working SR-10 on e Bay on July 30, 2005 for .99 plus shipping from the original owner who rolex replica sale used it in college. has an excellent technical discussion including internal photographs. A scientific caluclator in that it has scientific notation, square root, 1/x and x squared.For very comprehensive and detailed information on TI calculators, I recommend you browse through Donations of vintage calculators are also always gratefully known as the TI 2500, was the first TI pocket calulator. Be sure to check out the history section of an excellent discussion of the development of the Datamath calculator and TI's two desktop calculators, the TI 3000 and TI 3500 introduced at the same time. TI's first "scientific calculator," since it has scientific notation. The original Ni Cad batteries were removed and there is some corrosion. It comes with a charger which cannot be used without the Ni Cad batteries. I wanted a SR-50 in 1974 while in high school, but it cost about 0 - in excess of 0 in today's dollars. Another example (a gift) does not have the rechargable battery. has excellent and detailed information about the TI SR-50. It does not have trigonometric and log functions, however. according to in 1972 along with the Datamath pocket calculator and the TI 3000 desktop.(I have seen an old ad stating a 5 price, however.) 5 in 1969 dollars equals an astonishing ,868.96 in 2009 dollars.The QT-8D was nevertheless not only much smaller than prior electronic calculators, but also much less expensive.The combined RAM and ROM of TI 83 Plus is nearly ten times that of the Kaypro. Comes with a grey plastic folding case which was directly attached to the calculator. (1982) a small printing LCD calculator using thermal printing. In very good cosmetic and working condition except the print is light (I assume the thermal paper is too old), the label on the back came off and is taped back on, and there are two velcro strips firmly attached to the back.