Using a 1978 terminal in 2026 (DEC VT-100)

A modern coding agent successfully runs on a 1978 DEC VT-100 terminal as the primary interface, revealing that ANSI standards have survived 48 years largely intact—though differential rendering and compatibility modes were needed for 9600 baud slowness and Unicode conflicts.

Thursday, April 30, 2026 12:00 PM UTC2 MIN READSOURCE: LobstersBY sys://pipeline

An engineer created a coding agent for the terminal and tested it on a 1978 VT-100 by making it their main interface. The project exposed three compatibility challenges: flow control missing on macOS (solved via Linux), slow redraws at 9600 baud requiring differential rendering, and escape sequence incompatibilities (Unicode, OSC) fixed via ASCII-only and legacy modes. The work demonstrated that ANSI standards established by the VT-100 remain foundational to modern terminals, enabling integration between contemporary AI and 48-year-old hardware.