@hunger @argv_minus_one @puppygirlhornypost2 @pancake
No.
These are *a* two architectures.
There's also SuperH, DEC Alpha, PARISC, OpenRISC, MicroBlaze, Xtensa, ARC, NIOS II.
I do not know which of those are still being used in some embedded systems. The kernel maintainers for those architectures probably know, you'd have to ask them.
Motorola 68k is still alive: https://en.wikipedia.org/wiki/NXP_ColdFire
You can buy those chips today:
https://eu.mouser.com/ProductDetail/NXP-Semiconductors/MCF54416CMJ250?qs=6NAriTSiIYtaMvUvjjtOUg%3D%3D