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71 lines
1.4 KiB
Plaintext
71 lines
1.4 KiB
Plaintext
import VTMode from "@/components/VTMode";
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# Select 80 or 132 Columns per Page (DECCOLM)
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<VTMode value={3} />
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Sets the screen to 132 columns if set or 80 columns if unset.
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This requires [`132COLS` (DEC mode 40)](/vt/modes/132cols) to be set
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to have any effect. If `132COLS` is not set, then setting or unsetting
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this mode does nothing.
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When this mode changes, the screen is resized to the given column amount,
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performing reflow if necessary. If the GUI window is too narrow or too wide,
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it is typically resized to fit the explicit column count or a scrollbar is
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used. If the GUI window is manually resized (i.e. with the mouse), the column
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width of DECCOLM is not enforced.
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The scroll margins are reset to their default values given the new screen size.
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The cursor is moved to the top-left. The screen is erased using
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[erase display (ED) with command 2](/vt/ed).
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## Validation
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### DECCOLM V-1: Disabled
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```bash
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printf "ABC\n"
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printf "\033[?40l" # disable mode 3
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printf "\033[?3h"
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printf "X"
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```
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```
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|ABC_____|
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|Xc______|
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|________|
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```
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The command should be completely ignored.
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### DECCOLM V-2: Unset (80 Column)
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```bash
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printf "ABC\n"
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printf "\033[?40h" # enable mode 3
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printf "\033[?3l" # unset the mode
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printf "X"
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```
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```
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|X_______|
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```
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The screen should be 80 columns wide.
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### DECCOLM V-3: Set (132 Column)
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```bash
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printf "ABC\n"
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printf "\033[?40h" # enable mode 3
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printf "\033[?3h"
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printf "X"
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```
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```
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|X_______|
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```
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The screen should be 132 columns wide.
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