What to preserve from the pre-IP era

Just throwing this out to see what other people think. I suspect we're at the tail end of the usage life of devices that don't speak IP. I'm mostly thinking about networking devices 80's > 00's So, what needs to be preserved? How much of this does CHM need to do? Is any other collecting institution already covering this? How much is within scope? We've been having curatorial discussions about this for years inside CHM, and have been doing some directed collecting since before the big exhibition was locked down in 2010, but it is a big topic and there were a lot of evolutionary dead-ends. What got me thinking about this is I've been working with someone who has storage units full of mid-80's IBM SNA stuff and it's taken me months to scan a fraction of it. I know there are huge swaths of telephony and networking that I've never even looked at. It's pretty overwhelming, actually, to get my head around from the software side.