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).