Badge of the RadioShack TRS-80 Color Computer 2, showing a red-green-blue graphic design to signify the computer does color graphics
https://media.hachyderm.io/media_attachments/files/109/654/435/317/364/247/original/e2855f1279794ec8.jpeg
There's even variations on the rainbow, e.g. the Tandy CoCo had a variation, a red-green-blue graphic design
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