The terminal emulator you use today traces a lineage back to actual physical hardware terminals — understanding that history explains some genuinely strange terminal behavior that otherwise makes no sense.
Real Physical Terminals
Before personal computers, users interacted with mainframes and minicomputers through physical terminals — the DEC VT100, released in 1978, became so influential that its control codes (escape sequences for cursor movement, color, formatting) are still the baseline standard most terminal emulators emulate today, over four decades later.
Why “VT100 Compatible” Still Matters
echo $TERM # xterm-256color, screen-256color, etc. - almost all descend from VT100/ANSI compatibility
This is exactly why terminal color codes are called “ANSI escape codes” and why so much terminal software still nominally targets VT100/VT220 compatibility — it’s a genuinely deep, deliberately preserved lineage, not an arbitrary technical choice made recently.
From Physical Hardware to Software Emulation
xterm, developed in the 1980s for the X Window System, was one of the first software programs to emulate these physical terminals rather than requiring the real hardware — the direct ancestor of virtually every modern terminal emulator (GNOME Terminal, iTerm2, Windows Terminal), all of which still fundamentally speak the same VT100-derived escape sequence language underneath their modern features.