Museum of Software Mainstays of Yore ..?

The ‘terrible’ news (not) that Flash is about to be abandoned by one of its last if not the last pillar of support, reminds me of similar ‘developments’ of the past. Like, where did Dynamic HTML go ..? DEC, Sun (Sparc), Compaq, WordPerfect, Norton Utilities, 9-pin matrix printers, bulletin boards, portals. Etc.etc. Yes, yes, I know, some are still around, like OpenVMS is. And in software in particular, there may be many, many more of the lost ark items – where I’d like to see more focus on. Are they valued enough, for their staying power ..? Isn’t their staying a bit exasperated, in some dark corners of the usage landscape ..?
But more importantly (it is); is there some museum or so out there that preserves them for prosperity? I don’t mean just any ‘computer museum’ as they are (all?) of the scattershot type. I mean some museum that captures most of the essentials of the already many eras past, in IT. Like What the Dormouse Said is on paper, but then in software, running, and presenting systems as end users would experience them, a decade, two decades, -plus, ago. Without smartphones, without fastest Internet let alone actually working WiFi.

Edited to add, before scheduled posting: This, on a farewell to ‘screen savers’.

So, if you’d have some pointers, please..?

[Edited to add: A chunk of the above, here.]

Thanks in advance through:

[Once (??) was modern; Madrid]