UEFI
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Unified Extensible Firmware Interface or UEFI is a specification for the firmware architecture of a computing platform. When a computer is powered on, the UEFI implementation typically runs first, bef
Boot order selection menu on a Lenovo ThinkPad T470 with both UEFI and BIOS support
The UEFI implementation is usually stored on NOR-based flash memory located on the motherboard. Various I/O protocols can be used, SPI being the most common.
BIOS
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In computing, BIOS or the Basic Input/Output System is a type of firmware used to provide runtime services for operating systems and programs and to perform hardware initialization during the booting
UEFI
…the operating system or any other program is loaded. Examples include AMI Aptio, Phoenix SecureCore, TianoCore EDK II, and InsydeH2O. UEFI replaces the BIOS that was present in the boot ROM of all personal computers that are IBM PC compatible, although it can provide backwards compatibility with the BIOS…
A pair of AMD BIOS chips for a Dell 310 computer from the 1980s. The bottom one shows the distinct window of an EPROM chip.
BIOS chips in a Dell 310 that were updated by replacing the chips
BIOS replacement kit for a Dell 310 from the late 1980s. Included are two chips, a plastic holder for the chips, and a IC extractor.
American Megatrends BIOS 686. This BIOS chip is housed in a PLCC package in a socket.