Tertiary Device Attributes (DA3)

Category: device · Tags: VT510 · Specification ↗

DA3 (CSI = c) returns the terminal's unit ID as a DCS response. Less commonly supported than DA1/DA2, primarily by xterm and terminals that aim for high VT compatibility.

How this is tested: Send CSI = c, check for a DCS ! | response.

Supported by 4 of 12 backends (33%)

Terminal Applications

Terminal	Version	Support	Notes
iTerm2	3.6.9	? unknown
Ghostty	1.3.1	? unknown
cmux	0.62.2	? unknown
Kitty	0.46.2	? unknown
VS Code	1.112.0	? unknown
Warp	0.2026.03.18.08.24.03	? unknown
Cursor	2.6.21	? unknown
Terminal.app	2.15	? unknown

Headless Backends

Parser correctness only — a ✓ means the parser accepts the sequence.

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
vt100	0.2.1	✓ yes
vterm	0.2.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes

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