IBM 4400 manual Special Function Control Character. The first character

Appendix D

	S
Serial
communications	The sequential transmission of data, in which each
	element is transferred in succession.
Set	To turn on, activate, invoke, or enable.
SFCC	Special Function Control Character. The first character
	in a printer command sequence. In P-Series emulation
	mode, you can select one of five characters as the
	SFCC. In the Serial Matrix or Proprinter protocols, the
	SFCC must always be the ASCII ESC character. See
	also command sequence.
Shadow printing	A typeface with a heavy line thickness produced when
	the characters doublestrike just offset of the original
	characters. See also character weight. Compare with
	bold print.
Slewing	Rapid vertical paper movement.
SSCC	Super-Set Control Code. The SSCC is used to activate
	the super-set commands. It consists of the SFCC plus
	the sequence } ;
Start bit	The signal that indicates the start of a character or
	element.
Stop bits	The signal that indicates the end of a character or
	element.
String	Two or more bytes of data or code treated as a unit.
Substitution Table	A table that contains the code points within a character
	set that need to be changed for an international
	language.
Symbol set	See character set.

	T
True	On or 1. “High true” refers to a positive relative voltage
	representing the ON state; “low true” refers to a
	negative relative voltage representing the ON state.
Type style	Refers to either the upright (roman) or italic character
	style within a specific font family.
Typeface	A descriptive name or brand name that identifies a
	particular design of type.
Typographic font	See font, proportional.

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