Epson PR9 User Manual page 167

Appendix B OKI-Emulation Commands
ESC % U
This command code sets print mode to unidirectional print, code ESC % B can change
this mode.
Hex (1B 25 55)H
Decimal (27 37 85)D
Octal (33 45 125)O
ESC [
This command code sets double height print mode.
Hex (1B 5B)H
Decimal (27 91)D
Octal (33 133)O
Code ESC [ can reset this mode.
One line's base line is at the character's bottom and line spacing is
Note:
determined by the highest character.
ESC ]
This command code resets double height print mode.
Hex (1B 5D)H
Decimal (27 93)D
Octal (33 135)O
B-20
Set Unidirectional Print Mode
Set Double Height Print Mode
Reset Double Height Print Mode