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ESC '!' n Set Print Mode
Code 1BH 21H n
Function Sets a print mode for 1-byte characters.
Each bit of n is used as follows:
Bit Function n=0 n=1
0 Undefined - -
1 Undefined - -
2 Undefined - -
3 Emphasized printing Canceled Set
4 Double printing Canceled Set
5 Double-width Canceled Set
6 Undefined - -
7 Underline Canceled Set
The underline is attached to all character widths, including character right-side spacing.
However, it is not attached when skipped by HT or other commands.
The underline width can also be modified with FS '-'. When the underline width is not specified
by FS '-', default width is set as 1-dot underline.
This command is valid for 2-byte characters, except underlines.
If emphasized printing is canceled, double printing is canceled. If double printing is canceled,
emphasized printing is canceled.
The underline mode can also be selected or canceled by other commands, but the most recently
processed command is effective.
Default n=0 (Cancel emphasized printing mode/double printing mode/double-width printing
mode/underline mode)
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