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I'm not that familiar with Macs, but if they're using an Intel CPU it almost definitely starts in 16-bit mode. From what I understand the T2 chip is more akin t
by Avery3R 7y ago
I'm not that familiar with Macs, but if they're using an Intel CPU it almost definitely starts in 16-bit mode. From what I understand the T2 chip is more akin to what's called an embedded controller in other laptops.
- fortran77 7y agoAccording to the CPU processor manuals, they all boot in "real mode" which is a 16-bit legacy/bootstrap mode.
- pwg 7y agoYes, all Intel X86 CPU's start up in 'real mode' which is 16-bit mode. They start this way because at initial reset none of the required data structures for protected mode operation (page tables, GDT, IDT, etc.) are present. So the CPU starts up as a very fast 8086 who's purpose is to setup just enough page tables, a GDT, an IDT, etc. to be able to switch into protected mode and continue system bootstrap.