PostScript runs on NeWS, although NeWS was not a fully-compliant PostScript interpreter. There were incompatibilities between the NeWS PostScript interpreter and ``official'' PostScript interpreters as defined by Adobe and the Apple LaserWriter family of printers, such that many PostScript files which would print fine on a LaserWriter would not render under NeWS. The most critical incompatibility was lack of support for Adobe Type 1 fonts, Sun having gone with their own font format known as F3. F3 fonts have now gone the way of the zumbooruk and will be supplanted by Type 1 fonts.