Ok I’m old enough to have been a computer geek in the era of DOS and config.sys/autoexec.bat manipulation and have been a card carrying computer nerd for 25 years, so it surprises me to hear reference to a “CA card” I have never heard of

WTF is a CA card?

This doesn’t surprise me at all. I work at an avionics company and we support stuff that was designed 30+ years ago (if it’s still flying we’re still supporting it, even if we haven’t built it for years.) We’ve got a lab for our first CRT-based display/integrated avionics system that runs on an Apple IIe. Our IT…