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question: what does a pocket calculator use to convert binary into decimal data?

I've always been curious about this.

a calculator is nothing but a simple computer right? therefore it's core component consists of a microprocessor which instructs and processes in binary, so what is doing all the rest?

obviously it needs some kind of programming language like BASIC to convert the computer logic into decimals, and it needs some kind of interrupt handler for the keypad and the LCD screen. in a desktop computer this is done by the BIOS, so my question is does a calculator

have a bios containing actual software for all this or is it hardwired into the CPU or what?

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# Pocket calculators

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