ML720/721 Printer Handbook 67Appendix A: SpecificationsPrint Method Impact dot matrixPrinthead 9 pins, 0.30 mm diameter with thermal protectionPrint SpeedMode Characters per Second (CPS)High Speed Draft (HSD) 507 cps at 10 cpiUtility 380 cps at 10 cpiNear Letter Quality (NLQ) 95 cps at 10 cpiSuper Speed Draft (SSD) 570 cps at 12 cpiCharacters per Line (CPL)Setting ML720 ML72110 cpi 80 cpl 136 cpl12 cpi 96 cpl 163 cpl15 cpi 120 cpl 204 cpl17.1 cpi 137 cpl 233 cpl20 cpi 160 cpl 272 cplEmulations Epson FX, IBM Proprinter, OKI Microline co-residentInterface Standard: Centronics parallel, USBOptional: RS-232C serialGraphics Resolution:Epson/IBM Single Density: 60 x 216 dpiEmulations Double Density: 120 x 216 dpiQuadruple Density: 240 x 216 dpiMICROLINE Single Density: 60 x 72 dpi / 72 x 72 dpiEmulations Double Density: 120 x 144 dpi / 144 x 144 dpiQuadruple Density: 240 x 144 dpi / 288 x 144 dpi