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iBoot is the stage 2 bootloader for iPhones, iPads, Apple silicon-based Macs, and the T2 chip in Intel-based Macs with such a chip. [3] [4] Compared with its predecessor, iBoot improves authentication performed in the boot chain. [2] For Intel-based Macs with a T2 chip, the boot process starts by running code on the T2 chip from the boot ROM.
An Apple PowerBook 180c displaying the Happy Mac during the startup process. In all instances, the startup chimes will be heard upon completion of the boot process (if successful), and a Happy Mac (or the Apple logo on newer versions) will be displayed on the screen to visually indicate that no hardware issues were found during the boot process.
Apple G3 iMac booted in Target Mode. Target Disk Mode (sometimes referred to as TDM or Target Mode) is a boot mode unique to Macintosh computers.. When a Mac that supports Target Disk Mode [1] is started with the 'T' key held down, its operating system does not boot.
Disk II drives. The Disk II Floppy Disk Subsystem, often rendered as Disk ][, is a 5 + 1 ⁄ 4-inch floppy disk drive designed by Steve Wozniak at the recommendation of Mike Markkula, and manufactured by Apple Computer It went on sale in June 1978 at a retail price of US$495 for pre-order; it was later sold for $595 (equivalent to $2,780 in 2023) including the controller card (which can ...
With boot times more of a concern now than in the 1980s, the 30- to 60-second memory test adds undesirable delay for a benefit of confidence that is not perceived to be worth that cost by most users. Most clone PC BIOSes allowed the user to skip the POST RAM check by pressing a key, and more modern machines often performed no RAM test at all ...
A storage controller for the computer's solid-state drive, including always on, on-the-fly encryption and decryption of data to and from it. [4] [9] [10] The T2 is integral in the boot sequence and upgrading of operating systems, not allowing unsigned components to interfere. [4] [8] [9] [10]
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In PowerPC-based Macintoshes, the boot process starts with the activation of BootROM, the basic Macintosh ROM, which performs a Power On Self Test to test hardware essential to startup. [4] On the passing of this test, the startup chime is played and control of the computer is passed to OpenFirmware.