IBM 4400 manual Unidirectional Printing, Ascii Code ESC U n Hex Code

Chapter 5 Configuring the Proprinter III XL Emulation with Control Codes

Underline

ASCII Code ESC – n

Hex Code	1B 2D n
Dec Code	27 45 n
Purpose	Enables or disables automatic underlining of all characters.
where:	if n = 00, 02, 04... (all even) automatic underlining is disabled
	if n = 01, 03, 05... (all odd) automatic underlining is enabled
Comment	When automatic underline is enabled, all characters, including
	spaces, are underlined until disabled.
Example	The following sample illustrates automatic underlining and
	underlining reset.

Unidirectional Printing

ASCII Code ESC U n

Hex Code	1B 55 n
Dec Code	27 85 n
Purpose	Sets or cancels unidirectional printing.

Discussion The printer ignores this command.

Vertical Tab

ASCII Code VT

Hex Code 0B

Dec Code 11

Purpose Prints the data in the buffer and advances the paper to the next vertical tab position.

Comment In Proprinter XL protocol, vertical tab positions are set by control code ESC B and executed by control code VT. In this mode, if vertical tabs are loaded, the paper position moves to the next vertical tab position.

If a vertical tab format is not defined, the paper position is advanced to the next line at the current line spacing. If a vertical tab format is defined but no vertical tab positions are set between the current print position and the end of the form, the paper position is advanced to the top of the next form. The VT code resets all single line print attributes. More information on vertical tabs is provided in Chapter 9, “Vertical Page Formatting.”

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