Open Firmware and the FreeBSD loader use it presently.

sedatk · on July 9, 2015

Yes, IIRC Intel's Itanium (IA64) architecture used firmware and drivers in Forth (instead of machine code) so you could use the hardware on any CPU architecture.

pgeorgi · on July 9, 2015

No, Itanium specifically eschewed OpenFirmware (IEEE1275-1994, which is ANS Forth based) in favor of inventing EFI, which would develop into UEFI later.

Among the reasons: no interest in bytecode (UEFI now has EBC), no ACPI support (IEEE1275 predates ACPI by a decade, Intel didn't bother), protecting Intel's "Independent" BIOS Vendors from having to compete in an existing market (there were several OpenFirmware vendors).

Most OF implementations are now open source, we collected them at www.openfirmware.info.