What was it programmed with?

what was it programmed with?

Attached: 220px-Casio_F-91W_digital_watch.jpg (220x263, 14K)

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quora.com/Why-is-the-Casio-F-91W-so-reliable-Which-programming-language-is-used-on-it
computerhistory.org/siliconengine/digital-watch-is-first-system-on-chip-integrated-circuit/
en.wikipedia.org/wiki/Robert_Mueller#Military_awards
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Inb4 gentoo

probably just assembler for whatever microcontroller drives it, probably something very simple like a PIC or indigenous Casio equivalent

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Allah's will.

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quora.com/Why-is-the-Casio-F-91W-so-reliable-Which-programming-language-is-used-on-it

It's likely all done in hardware. A microcontroller is overkill for a watch even today and they were bigger,more expensive, and a lot more power hungry in the 80s.

Start with a crystal oscillator at some frequency that can be easily divided down to seconds. Divide down with binary counters (D-flip flops in sequence). More counters for minutes, hours, days. A bunch of AND,and OR gates to get the appropriate 7-segment digits to light up.

in the early 70s maybe, but by 1991? not really, you definitely still might not be wrong, but a microcontroller makes more sense especially since the F-91W logic is pretty much entirely contained in a single chip

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Machine language

microcode