IBM 4400 manual Through FF using codes hex 20 through hex 7F

Chapter 4 Configuring the Serial Matrix Emulation with Control Codes

Extended Character Set

ASCII Code ESC 4

Hex Code	1B 34
Dec Code	27 52
Purpose	Accesses the extended character set in the range hex A0
	through FF using codes hex 20 through hex 7F.
Comment	This code is used in 7-bit systems as if data bit 8 was set to 1.
	For example, sending code hex 20 accesses the symbol at code
	point hex A0. If a printable symbol is not available at the code
	point, a space is printed.
	ESC 4 is not cancelled by the next paper motion command.
Example	The following sample illustrates Extended Character Set.

Extended Character Set Cancel

(Primary Character Set Select)

ASCII Code ESC 5

Hex Code	1B 35
Dec Code	27 53
Purpose	Cancels Extended Character Set as selected by ESC 4, and
	selects the Primary Character Set.
Comment	This code is used in 7-bit systems as if data bit 8 was set to 0. If
	data bit 8 is disabled, this control code selects the range as if
	data bit 8 is set to 0, and data is printed as characters from hex
	20 through hex 7F.
Example	See the Extended Character Set example.

96