[mda]

So, 40 year old x86 and 30 year old ARM is not full of legacy issues and layers over layers of hacks? A good fresh start has always possibilities, real question is if Apple is competent enough to pull it off.

[rwmj]

64 bit ARM is a mostly new ISA.

[monocasa]

x86 is rough, but ARM is still a fairly clean ISA.

[Nelson69]

What about ia32e x86?

Other than booting it, and EFI is addressing that, it's a fairly clean and nice architecture. Some of the registers have legacy names. Are there any really odd legacy behaviors?

[monocasa]

Pretty much everything still exists in AMD64. You can still set up a 16-bit process while running under long mode.