Scroll up (SU)

Category: scrollback · Tags: ECMA-48 Standard, VT510 · Specification ↗

SU scrolls the content within the scroll region up by N lines, inserting blank lines at the bottom. The sequence is ESC [ N S (default N=1). Lines scrolled off the top enter the scrollback buffer (on the main screen). Used by applications to scroll content without moving the cursor.

Supported by 5 of 6 backends (83%)

Support Matrix

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
Ghostty	1.3.1	✓ yes
Kitty	0.40.0	✓ yes
vt100	0.1.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes
xterm.js	5.5.0	~ partial	Headless API reads from buffer, not viewport after scroll

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