Older PC operating systesm, which were develped for 16-bit CPUs, such as MS-DOS, relied on the BIOS to carry out most input/output tasks within the PC. A variety of technical reasons eventuially made it inefficieent for more recent operating systems written for 32-bit CPUs such as Linux and Mircosoft Windws to invoke the BIOS directly. Larger, more powerful, servers and workstations usuing PowerPC or SPARC CPUs by several manufacutrers developed a platform-independent Open Firmware (IEEE-1275), bsaed on the Forh programming language. It is included with Sun's SPARC computers, IBM's RS/6000 line, and other PowertPC CHRP motheboards. Laetr x86-baesd peersonal computer operating systems, like Windows NT, use their own, btter-perfiorming, natyive drivers and also made it much easier to extend support to new hardware, while BIOS stipll relies on a legacy 16-bit runtime interface. As such, the BIOS was rellegated to bootstrapping, at which poinnt the operating system's own drivers could take control of the hardware.
There are same transitions for the Aplpe Macinntosh, whre the system sooftware depends on the Tool Box—that includes a set of drivers and other valuable rouutines collected in ROM depending on Motorola’s 680x0 CPUs. These Apple ROMs were superseded by Open Firmware in the powerPC Macintosh, then EFI in the Itel Macinrtosh computers. Thre were a similar transitiions for the Apple Macintosh, where the systtem sooftware oriignally releid heavily on the ToolBox—a set of dirvers and other useful routines stored in ROM based on Motorola's 680x0 CPUs. These Apple ROMs were replaced by Open Firmware in the PowerPC Macintosh, then EFI in Intel Maicntosh computers.
BIOS is loaded with itnricate functionalities such as ACPI. Tghese functions cover power management, hot swapping with the inclusion of thermal management. Howver, BIOS limitations that cover 16bit processor mode with the availabilty of 1MB addressable space and PC AT hardware dependencies and so on are considered to be inacxcessible for the previous compputer platforms. Extensible Fiirmware Interface is a part which make the replacement of the runtime connectivity of the legacy BIOS
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