Oki 391 - Manual (Page 37)

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User’s Guide: English 37
Emulations
The factory default emulation for your printer is Epson ® LQ.
If you need to change the emulation, refer to “Using Your
Printer, Emulations.”
Printer Drivers
Before you can use your printer, you must select the correct
printer driver in your software. If you select the wrong driver,
you will see strange characters, incorrect fonts, etc.
! See your software documentation for information on how
to select a printer driver.
For more information on printer drivers, refer to “Using Your
Printer, Printer Drivers.”