Just immagine what would happen, if some major co.pany put this kind of artificial constraint on their SW during a major chip shortage... That would be fun.
I think the closest one is MIPS R4000, supported by Linux, and it will be 30 y/o this October.
Intel i860 was introduced in 1989, but Linux does not support it yet.
Newly manufactured 80486 was used in embedded systems till 2007. It's old but it's reliable.
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