Epson PR9 User Manual page 254

ESC 6
Hex: (1B 36)H
Decimal: (27 54)D
Octal: (33 66)O
ESC 7
Hex: (1B 37)H
Decimal: (27 55)D
Octal: (33 67)O
Appendix D EPSON LQ-Emulation Commands
Set printable character
Reset printable character
D-33