[raw_anon_1111]

That sounds like the same ugly hack that caused programs not to be “32 bit clean” back in the day for Macs

[ack_complete]

One difference is that the Mac OS itself was not initially 32-bit clean, with the top byte being used by the Memory Manager.

[rwmj]

Ah yes, these 68000 pointers have a spare 8 bits for me to use! Because nothing will ever need more than 16 MB of memory. Sigh.

[projektfu]

It's all good if you have 128kb ram but they should have had a plan to escape it from day one.

[dcrazy]

This is how pointer authentication codes work on Arm64.