[3][4] T2 has its own RAM and is essentially a special embedded controller of its own, running in parallel to and responding to requests by the main computer that the user interacts with.

Analysis also reveals the same amount of RAM controllers, but a much reduced GPU facility; three blocks, only a quarter the size compared to A10.

[6] The bridgeOS of Apple T2 is stored in a firmware partition of the Mac's built-in SSD, which is hidden in macOS and Windows.

[3] There are numerous features regarding security, including: The T2 is integral in the boot sequence and upgrading of operating systems, not allowing unsigned components to interfere.

[10] On July 12, 2018, Apple released an updated MacBook Pro that includes the T2 chip, which among other things enables the "Hey Siri" feature.

In October 2019 security researchers began to theorize that the T2 might also be affected by the checkm8 bug as it was roughly based on the A10 design from 2016 in the original iMac Pro.

[24][25][26] Later in the year the release of the blackbird SEP vulnerability further compounded the impact of the defect by allowing arbitrary code execution in the T2 Secure Enclave Processor.

Developer Rick Mark then determined that macOS could be installed over the same iDevice recovery protocols, which later ended up true of the M1 series of Apple Macs.