Unisys E-@CTION EFP9800 - Manual (Page 163)

EFP9800 ESC/POS Commands
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A line feed is automatically performed any time the number of characters is
greater than the specified width of the page (assuming no commands
including a line feed are present). This moves the print starting position to
the next line.
•
Increase the amount of line feeding for any lines that match the following
circumstances: the line that follows a line with default line spacing (1/6
inch— 12 vertical dots) contains double-high or quadruple-size characters or
bit images that are two or more lines. If the line spacing is not increased,
the higher order dots of the character or bit image will overlap with the
previous line.
Note: Do not print double-high characters on the first line of the
printable area. Perform a line feed to print the characters
on the second line.