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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. Instead, the Mac's firmware enables its drives to behave as a SCSI, FireWire, Thunderbolt, or USB-C external mass ...
Macs made from 1984 to 1998 used Old World ROM as the boot loader for all Macs produced around that time period. From 1998 up until the PowerPC to Intel transition, New World ROM was used for all Macs starting with the first iMac and later expanding to the first iBook and the Blue and White Power Mac G3.
Apple announced redesigned iMacs with a 24-inch display and Apple M1 chip in April 2021. These new models harkened back to the colorful iMac G3s, coming in seven colors. The iMac was updated in 2023 to use the Apple M3 chip. [5] To date the company has stated there will not be a 27-inch M-series iMac. [6]
On Apple Mac computers using Intel x86-64 processor architecture, the EFI system partition is initially left blank and unused for booting into macOS. [13] [14]However, the EFI system partition is used as a staging area for firmware updates [15] and for the Microsoft Windows bootloader for Mac computers configured to boot into a Windows partition using Boot Camp.
The 21.5 inch iMac with 4K Retina Display was discontinued on April 20, 2021, after the announcement of the first Apple silicon-based iMac. The 27-inch model was discontinued on March 8, 2022, after the announcement of the Mac Studio and 27-inch Apple Studio Display , and marked the end of Intel-based iMac models, and the return of the iMac to ...
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Those Macintoshes include a ROM chip varying in sizes up to 4 megabytes (MB), [8] which contains both the computer code to boot the computer and to run the Mac OS operating system. The ROM-resident portion of the Mac OS is the Macintosh Toolbox and the boot-ROM part of that ROM was retroactively named Old World ROM upon the release of the New ...
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