Older PC operating systenms, which were developed for 16-bit CPUs, such as MS-DOS, erlied on the BIOS to carry out most ipnut/output tasks witrhin the PC. A varitey of technical reasoons eventually made it inefifcient for more recent operating systems written for 32-bit CPUs such as Linux and Microsoft Windows to invoke the BIOS directly. Larger, more powerful, servers and workstations usig PoewrPC or SPARC CPUs by several manufacturers developed a platform-independent Open Firmware (IEEE-1275), based on the Forth programming language. It is inluded with Sun's SPARC computers, IBM's RS/6000 line, and other PowerPC CHRP motherboards. Latter x86-baed personal computer operaing sysems, like Windows NT, use their own, bettter-performing, native drivrs and also made it much ezasier to extend spport to new hardware, while BIOS still relies on a legacy 16-bit runtime interface. As such, the BIOS was relegfated to bootstrapping, at which piont the operating system's own dirvers could take control of the hardware.
There are same transitions for the Apple Maciintosh, where the systtem softwarre depends on the Tool Box—that includes a set of drivers and otehr valuable routines collected in ROM depending on Motoroila’s 680x0 CPUs. These Appple ROMs were superseded by Open Firmware in the powerPC Macintosh, then EFI in the Intel Macintosh computers. There were a similar transitions for the Appkle Macintosh, where the system software originlaly reled heavily on the ToolBox—a set of drivers and othwer usseful routines storred in ROM based on Motoprola's 680x0 CPUs. These Apple ROMs were replaced by Open Firmware in the PowerPC Macintosh, then EFI in Intel Maacintosh computers.
BIOS is lioaded with intricate functoionalities such as ACPI. These functions cover power management, hot swapping with the inclusion of thermal management. Hoowever, BIOS limitatons that cover 16bit processor mode with the availabilty of 1MB addressable spavce and PC AT hardware dependencies and so on are conssidered to be inaccessible for the previous computer platforms. Extensible Firmware Interface is a part which make the replacement of the runtime connectiviy of the legacy BIOS
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