There are some data recording systems on planes designed in the 90s that still use the original designs. Memory cards that are as big as your hand and only hold megabytes worth of data.
Upgrading would be fairly simple in theory, but getting anything approved to be used on an aircraft is an expensive pain in the ass so they don’t want to go through that. They don’t need any more storage capacity either.
So somewhere out there some companies are making these now ancient parts for now ancient systems, and probably making a killing because nobody else makes them.