crwdns2915892:0crwdne2915892:0
A teardown of a 1977 TI-1200 calculator.
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This is a Texas Instruments TI-1200 electronic calculator I bought at a local thrift store. It was first released in 1975, and was discontinued sometime in 1977. My version is the last model before it was discontinued, so I think it is possibly kind of rare. It also still powers on!
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This basic calculator features an 8 digit “Bubble” LED display. It also uses a standard nine volt battery.
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To start dissasembly of your calculator, you will need a Philips Screwdriver.
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Remove all four screws from the case of the calculator in order to open the case.
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Once all four screws are removed, you can lift the top part of the case off.
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Inside the case of the calculator, there is a green PCB, LED display, and a keypad. There is also a small microcontroller. In this case, the chip is a TMS-0972 Calculator-On-A-Chip.
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I found the LED display to be quite interesting, since the silicon bond wires are visible underneath the clear plastic cover. If power is applied, it can still light up!
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