Brother HL-1650/1670N - Manual (Page 115)

CHAPTER 3 CONTROL PANEL
3-35
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EPSON FX-850 and IBM Proprinter XL Mode
The EPSON FX-850 and IBM Proprinter XL modes are the emulation modes
that this printer emulates to meet the industry-standard for dot matrix
printers of their respective manufacturers. Some applications support these
dot matrix printer emulations. Use these emulation modes for optimum
performance when printing from those types of applications.