GMK Lunar commemorates Apollo 11's mission's 50th anniversary. It's inspired by the Apollo Guidance Computer and its interface DSKY (pronounced 'dis-kee').
As you can see, the DSKY has a black keypad with white legends, yellow indicator lights, and a green electroluminescent seven-segment display. Commands were entered numerically, as two-digit numbers — called Verb and Noun. The first one represented the action being issued, while the second represented the data that would be changed.
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