Most who are familiar with Sony's MiniDisc know it as a portable music playback format. But the MDCC-2000 had a much more unique purpose.

MDCC-2000 operating instructions (PDF): https://www.sony.com/electronics/supp...

Sources:
Stenography photo: https://www.flickr.com/photos/mgiffor...

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Music by Epidemic Sound (https://www.epidemicsound.com).
Intro music by BoxCat Games (https://freemusicarchive.org/music/Bo....