My text editor (Assembler, then C), 1982.
Some F18 Hornet software (C, ground station support), also 1982.
Humphrey Utrasound Biometer (updates, Z-80 assembler), 1992.
Kodak Spark-based picture kiosk (Solaris 8 upgrade, Solaris patches for FAT, USB, PCMCIA), 1999.
Another commenter answered that, at least in regards to medical equipment (similarly, embedded systems code for an ultrasound machine, in 1989) -- once code is FDA-approved, people won't touch it. I imagine if the F18 software met some milspec requirement, a similar rule would apply.
But why?