PARALLEL + SERIAL INTERFACE. InterfaceIEEE1284-1994 Bi-directional Parallel, RS-232C (25pin), (Optional) 100BASE-TX/10BASE-T. Print HeadDual 9 Pin. YELLOW HOUSING! Multi part paper : 35 - 40 gsm. Line Feed Pitch4.23mm (1/6 "), 3.18mm (1/8 "), n x 0.35mm(n/72 ") (n=1-85), n x 0.18mm(n/144 ") (n=0-255), n x 0.12mm(n/216 ") (n=0-255).