Brother HL-2600CN Series - Manual (Page 106)

CHAPTER 4 CONTROL PANEL OPERATION
4-37
HP-GL Mode
The HP-GL mode is the emulation mode in which this printer emulates the
Hewlett-Packard plotter model HP-7475A. Many graphics and CAD
applications support this type of plotter. Use this mode for optimum
performance when printing from those types of applications.
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.