this post was submitted on 13 Nov 2023
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this is a space for Cassette Futurism -- retro images, media, design and technology from the 70s and 80s
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It's a segmented display. Color display on consumer computers was to expensive at the time. because of the limited memory you could either have high resolution or few colors and low resolution, and high resolution was required if you need text.
My guess is that all displays have fixed segments and warning lights that can only be turned on or of.