Casio SL-300 Keyboard

The SL-300 calculator has a plastic key-top construction, and membrane keyboard. This is the back of the top-half of the case. As you can see, there are often numbers and points of interest for engineers to see.

These vintage 80s calculators are very collectible and often found on eBay. Many collectors in the UK and around the world love to look at the inside design and construction of these units. For electronics engineers, the calculator chip and LCD technology are of particular interest.

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