About Unix Terminal Mono
The green-phosphor Unix terminal is the black glass face of a P1-phosphor CRT that glows faintly green where text sits — the "green screen" of DEC VT-series video terminals and 1960s–80s Unix workstations. Its essence is raw early computing: a genuinely near-black screen, bright slightly-yellow terminal green for monospaced glyphs, and a command-line grid of fixed-width characters.
This system distills that emissive screen into digital form — near-black CRT glass, P1 phosphor green, the cursor block, the prompt, ASCII rules, and a faint glow halo around every character. Strictly monospace, strictly green, strictly grid.
- Origin
- North America (DEC, Maynard MA; Bell Labs, Murray Hill NJ)
- Era
- 1950–1990 (P1 green-phosphor monitors standard 1960s–1980s; DEC VT100 1978, VT220 1983)
- Key figures
- DEC VT-series engineers · Bell Labs Unix authors · Ken Thompson · Dennis Ritchie
- Movements
- Early command-line computing · Monochrome-CRT display technology · Unix/teletype interface tradition
Unix Terminal Mono design spec
Colors
Typography
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