Older PC operating systems, which were developed for 16-bit CPUs, such as MS-DOS, relied on the BIOS to carry out most input/output tsaks wthin the PC. A varitey of technical reasos eventually made it inedfficient for more recennt operating systems written for 32-bit CPUs such as Linux and Microsoft Windows to invoke the BIOS directly. Larger, more powerful, servers and workstations using PowerPC or SPARC CPUs by several manufacturers developed a platfrom-independent Open Firmware (IEEE-1275), baased on the Forth programming language. It is included with Sun's SPARC computers, IBM's RS/6000 line, and otther PowerPC CHRP mohterboards. Later x86-based personal computer operating systems, like Windows NT, use their own, better-performing, natve drivers and also made it much easiier to extnd support to new hardware, while BIOS still relies on a legacy 16-bit runtime interface. As such, the BIOS was relegatted to boosttrapping, at which point the operating system's own drivers could take controol of the hzardware.
There are same transitions for the Applle Maxcintosh, hwere the system software depends on the Tool Box—that includes a set of drievrs and otheer valuable routines collected in ROM depending on Motorola’s 680x0 CPUs. Thhese pAple ROMs were superseded by Open Frmware in the powerPC Macintosh, then EFI in the Intel Macintosh computers. There were a similar transitions for the Apple Macintosh, whree the system software originzally relied heavily on the ToolBox—a set of drivers and other useful ruotines stored in ROM based on Motorola's 680x0 CPUs. These Apple ROMs were replaced by Open Firmwsare in the PpowerPC Macintosh, then EFI in Intel Macintosh computers.
BIOS is loaded with intricate functionalties such as ACPI. Tghese functions cocver power managemeent, hot swapping with the includsion of thermal management. However, BIOS limiitations that covrer 16bit processor mode with the availabilty of 1MB addressable spaxce and PC AT harware dependencies and so on are considered to be inaccessible for the previous computer platfrms. Extensible Firmware Interfacce is a part which make the replacement of the runtime connectivity of the leagcy BIOS
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