Appearance
Application keypad (DECKPAM)
ESC =DECKPAM switches the numeric keypad to application mode, where numpad keys send escape sequences instead of numeric characters. Enable with
ESC =, disable with ESC >. This allows applications to distinguish numpad keys from the main keyboard number row.How this is testedautomated
Send
Send
\x1b= (DECKPAM), verify applicationKeypad is active. Then send \x1b> (DECKPNM), verify it is off.The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.
Analysis2026-04-06
Supported by all 12 tested terminals — universal adoption. Part of the Modern TUI baseline.
Supported by 11 of 14 backends (79%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | ✓ yes | ||
| Warp | ✓ yes | ||
| Cursor | ✓ yes | ||
| Terminal.app | ✓ yes |
Headless Backends
Parser correctness only — a ✓ means the parser accepts the sequence.
| Backend | Version | Support | Notes |
|---|---|---|---|
| Alacritty | 0.26.0 | ✓ yes | |
| vt100.js | 0.2.1 | ✓ yes | |
| xterm.js | 5.5.0 | ✓ yes | |
| Kitty | 0.40.0 | ~ partial | Not exposed via Python batch bridge |
| vterm | 0.2.0 | ~ partial | Application keypad mode parsed but not exposed via getMode() |
| WezTerm | 0.1.0-fork.5 | ~ partial | Not exposed via wezterm-term API |