Okidata Okijet 2500 1200 600 cart, 4 ink tanks http://www.okidata.com/mkt/html/nf/OJ2500Home.html B cdj550 Spoofs PCL for DOS apps under Windows, but other than that just won't work. Using Redhat6.1 printtool, selecting the HP Deskjet 550C/560C/6xxC driver gave me a picture perfect "Red Hat Printtool PostScript Test Page." It prints color and black in one pass. Dithering and color patches printed (some more accurately than others). Printer doesn't seem to accept text only in any way. I'm making an educated guess at "Mostly" - I haven't done much with it yet.