The space shuttle used both z80 and 8086 until it ended in 2011. The international space station runs on among other chips, 80386SX-20s. IBM/BAE also has a few RADs based on POWER chips.
Knowing how 8086 timing and interrupts worked was still important for what I was doing in the early 2000s. I don't pretend to remember any of it these days.
