IBM 4400 manual Forms length is defined in inches therefore, subsequent line

Form Feed

Form Feed

ASCII Code FF

Hex Code 0C

Dec Code 12

Purpose Prints the data in the buffer, advances the paper position to the next top-of-form, and moves the character position to the first character column.

Comment The default forms length is determined by the configuration in nonvolatile memory. Forms length is set by using the control panel or forms length control codes. Code FF cancels all single- line only print attributes.

The Form Feed command reacts differently when the VFU is active. See Chapter 9, “Vertical Page Formatting.”

Forms Length Set (Inches)

ASCII Code ESC C NUL n

Hex Code	1B 43 00 n
Dec Code	27 67 0 n
Purpose	Sets the length of forms (paper) in inches.
where:	n = whole numbers from 1 through 21 (hex 01 through hex 15) to
	specify the number of inches on a page.
Comment	Upon receipt of this code, the current line becomes the first line
	of the form, and the form length set becomes the current forms
	length. Vertical tab positions set below the bottom of the form
	are ignored.
	Forms length is defined in inches; therefore, subsequent line
	spacing changes do not affect the result of this command.
	The maximum forms length is 21 inches. All larger values are
	ignored.
	When forms length is changed by the ESC C NUL sequence, the
	bottom margin is set to zero. If the product of lines and line
	spacing (forms length) is not an exact multiple of the printer dot
	resolution, the value is adjusted down until forms length and dot
	resolution distance match.
	The current paper position becomes top of form. If the form
	length is set smaller than the line spacing, a line feed moves the
	current line spacing; a form feed advances paper position to the
	next top-of-form position.
	Forms length can also be set through the control panel. The
	control code forms length setting from the host computer
	overrides the control panel setting.

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