[Gordonjcp]

I know that the process outstations in a very large oil and gas pipeline uses a bunch of absolutely pristine MicroVAX 3100s in each building to drive the SCADA systems, which themselves are made up out of VMEBus or CAMAC crates with fairly simple 1980s electronics in them.

I feel confident that I could keep that old stuff running well into the future, long after a more modern system was no longer repairable. The main fault with the capture cards seems to be that the input multiplexers fail, and while they can still be repaired by the manufacturer the two types of chip they use are something I keep in stock by the hundreds for building audio circuits.