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G0/G1 character set switching
SI (Shift In, 0x0F) and SO (Shift Out, 0x0E) switch between G0 and G1 character sets. The G0 and G1 sets can be independently designated using
ESC ( X (G0) and ESC ) X (G1), where X selects the character set (B=ASCII, 0=DEC Special Graphics). This mechanism allows applications to quickly toggle between text and line-drawing characters without re-designating the character set each time.How this is tested: Send
\x1b(0 to designate G0 as DEC Special Graphics, write 'l', verify the cell renders as a box-drawing character (not literal 'l'). Restore with \x1b(B.Analysis2026-03-26
Supported by all 5 tested terminals — universal adoption. Part of the Core TUI baseline.
Supported by 11 of 11 backends (100%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | 1.112.0 | ✓ yes | |
| Warp | 0.2026.03.18.08.24.03 | ✓ yes | |
| Cursor | 2.6.21 | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes |