Epson PR9 User Manual page 171

Appendix B OKI-Emulation Commands
ESC z n
This command code can set and reset E13B Code mode.
Hex (1B 7A)H
Decimal (27 122)D
Octal (33 172)O
E13B Code mode is only valid when working mode is SHIFT JIS mode;
Note:
while E13B Code mode is valid, two byte code 0xa6 0xa1, 0xa6 0xa2, 0xa6
0xa3, 0xa6 0xa4, 0xa6 0xa5, 0xa6 0xa6, 0xa6 0xa7, 0xa6 0xa8, 0xa6 0xa9,
0xa6 0xaa, 0xa6 0xab, 0xa6 0xac, 0xa6 0xad, 0xa6 0xaewill be printed as
E13B code.
n = 1 : sets E13B Code mode
n = 0 : resets E13B Code mode
B-24
Set/Reset E13B Code