G. Branden Robinson wrote: > OpenFirmware (OF) ran on SPARC and PowerPC hardware, at least. OF had its origin in Sun OpenBoot PROM (OBP), which, ISTR, first appeared in the SPARCstation 1 (sun4c kernel arch) along with SBus. Earlier (VME) based SPARC (sun4 kernel arch) systems had only a Sun-3 like boot PROM (single letter commands, no Forth).