Epson PR9 User Manual page 166

ESC I
This command code starts emphasized print mode.
Hex (1B 69)H
Decimal (27 105)D
Octal (33 151)O
ESC j
This command code resets the emphasized print mode.
Hex (1B 6A)H
Decimal (27 106)D
Octal (33 152)O
ESC m
This command code starts double strike mode, in which all text characters are struck
twice.
Hex (1B 6D)H
Decimal (27 109)D
Octal (33 155)O
Code ESC n can reset this mode.
Note:
ESC n
This command code resets double strike mode.
Hex (1B 6E)H
Decimal (27 110)D
Octal (33 156)O
ESC % B
This command code sets print mode to bidirectional print, code ESC % U can change this
mode.
Hex (1B 25 42)H
Decimal (27 37 66)D
Octal (33 45 102)O
Appendix B OKI-Emulation Commands
Set Emphasized Print Mode
Reset Emphasized Print Mode
Set Double Strike mode
Reset Double Strike mode
Set Bidirectional Print Mode
B-19