Brother HL-1800 series - Manual (Page 114)

CHAPTER 4 OPTIONS
4-11
HL-1870N (Including 32 Mbytes of Internal Memory)
HP LaserJet, EPSON FX-850, and IBM Proprinter XL emulation modes
300 dpi 600 dpi HQ1200
Letter/A4 Standard Standard Standard
Legal Standard Standard Standard
BR-Script 3 mode
300 dpi 600 dpi HQ1200
Letter/A4 Standard Standard Standard
Legal Standard Standard Standard
Duplex printing
300 dpi 600 dpi HQ1200
HP LaserJet Standard Standard Standard
BR-Script 3 Standard Standard Standard