Texas Instruments Ti-85 Graphing Calculator
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This video is about the Texas Instruments Ti-85 graphing calculator, the TI series of graphic calculators were very popular graphic calculators back in the early 1990s to the late 1990s. People bought these things for math courses they took in high school or college/university. People who majored in math/science/engineering used it on college campuses.
It came with a big thick user's manual which was common for a lot of things at the time. The user's manual showed you how to program this device. You could put in mathematical equations and write a simple program for it, so you didn't have to do math by hand. You can put in a formula, like F = M x A, F (horizontal force)= (M x A) x Cos(theta), F(vertical force)=(M x A) x Sin(theta) . In the program, you can select horizontal force, and just plug in the M(mass), A(acceleration), theta(angle), and get the horizontal force. In another equation, you can find force vector with Pythagorean Theorem if you knew what the horizontal and vertical forces were. A programmable calculator was very useful to use in science and math courses because of this feature. Learning a programming language, like Fortran was required when you majored in science, or engineering majors. We did have to do a lot of repetitive calculations using equations, equations you would use like that force equations, and other equations we would derive.
The graphing aspect was useful to use in math courses, and physics courses which required you to get Sin and Cos waves. You can graph it out on a graphing calculator like this. I didn't just use the graphing calculator for mathematical applications, I used it to store information, because you can save information on the ROM, because it had a CR1616 battery which enabled you to save. We didn't have smartphones back in 1994. I would use this when I went shopping by putting in a list of what I needed and wanted, and I would use the calculator to calculate how much these things would cost. I wrote a simple program for that, where I entered the prices of each individual item, and it would compute everything with taxes when I was done.
Today, we don't need graphing calculators, because people can simply write apps on smartphones to emulate graphing calculator functions. You can simply download a graphic calculator app on a modern smartphone, it is more powerful than a graphing calculator, you can store more data than a graphing calculator, etc. Back in the 1970s to the 1990s, most of the machinery and devices we had were single function devices. You wanted to listen to music, you needed a Walkman that played tapes or CD-ROMs, you wanted to play game on the go get a Gameboy, etc. Today, you can listen to music, take pictures, play video games, use a phone, use a calculator, etc all on a single device. You can see how much things have progressed through the years
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[Links]
♦ Ti-82 User's Manual
• https://archive.org/details/texasinstrumentsti82guidebook
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