Retrocomputing has struck me, over the last six months, as being particularly unfriendly to novices. It's now reached the point where a new user (both to RC.SE and SE in general), probably a non-native speaker of English, comes in and gives the only correct answer to a question, and in less than a day it's deleted, leaving only information (in the question and other answer) that's greatly misleading.
My go-to example of the worst of this is "what is DMA and how does it work?". DMA invariably is used in modern computers, to the point where nobody even thinks about it any more, which is exactly why it's a good question in the context of '80s micros, where it would be a key selling point and worthy of discussion because it's rare. We managed to get that one re-opened, but only after quite the struggle against its almost-instant closing.
But there are plenty of other examples of situations where the context was so different from modern computing that the OP hardly knew what to ask, and all to frequently our response is not, "here is an introduction to the background you need to start to comprehend this entirely different universe of computing," but "You should have already had the background to have asked the question better for those who do already know all this."
Except, of course, as above when we start deleting correct answers.
I have no idea what to do about this at this point. Personally, I'm feeling like I should just move on to other places to document old computers. (You may note that after six months or so of fairly intense activity that lifted me from nowhere to #4 last year in reputation gain I've slowed down.)
Can this be fixed? Or has the community settled into into a state where the "in group" is going to do its thing and outsiders, even those with better information than anybody here, are simply not welcome?
And oh, yeah; I cannot undelete that one correct answer above because it's been deleted by a moderator. Maybe a mod could reconsider and undelete it? Though I suspect we've lost that user (again, the only one here who actually gave an answer anywhere close to being correct) forever.
Update: It's now a week later, another moderator restored the answer, and it's since gotten upvotes from people other than me (the OP) as well. So that's good, as far as it goes. However, the new user appears to have abandoned the site, and I'm also pretty disappointed that the moderator responsible for driving him away had not even owned up to what they've done, much less helped to fix the issue they created.