IBM 4400 manual If the emulation is configured for LF equals newline

Chapter 5 Configuring the Proprinter III XL Emulation with Control Codes

Line Feed

ASCII Code LF

Hex Code 0A

Dec Code 10

Purpose Prints the data in the buffer (if any) and advances the vertical character position one line at the current line space setting.

Comment If configured for LF equals new line (LF=CR+LF), the logical print head is positioned at character column 1 of the new line. Otherwise, the logical print head does not move when configured for LF function only (LF=LF ONLY). The LF function cancels all single line print attributes such as double high (elongated) and double wide (expanded) characters.

Line Feed n/216 Inch (One Line Only)

ASCII Code ESC J n

Hex Code	1B 4A n
Dec Code	27 74 n
Purpose	Advances the vertical character position n/216 inch for one line
	only.
where:	n = 1 through 255 (hex 01 through hex FF)
Comment	The n/216-inch line feed control code is effective for one line
	only. All single-line-only print attributes are canceled.
	If the emulation is configured for LF equals newline
	(LF=CR+LF), the paper advances one line at the current line
	space setting and the logical print head is positioned at
	character column 1.
	The paper position moves only in multiples of the current dot row
	spacing. If the distance to move is other than a multiple of the
	current dot row spacing, the remainder is added to the next
	paper motion command.
	Small values of n may result in overlapping lines. Overlapping
	lines may also occur if print attributes such as Elongated
	(Double High), Superscript, or Subscript characters are used on
	the same line. Printing at different horizontal and vertical
	densities do not overlap.
Example	The following example illustrates n/216-inch line spacing.

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