Is the history of Computer science on topic? I can see that you could argue that it falls under mathematical logic and therefore is on topic. Questions with this focus would include questions about Alan turing, code breaking, computability etc. The mathematical side being computer science is also an important distraction. A question about "what was the first pc?" is not computer science related.
I would say if the question focuses on the development and application of mathematical and/or scientific knowledge, ideas and theories - then, yes, it would be on topic. Also, if the development of computers can be related to to the development of a mathematical/scientific theory would be okay, IMHO.
I think the best thing to do here is to actually put up a well researched question on the history of computer science in main.
If it meets the following criterion:
It is challenging in the sense that it is not easy to find the answer on Google. The question should demonstrate prior research effort,
It is actually a question of history,
It directly relates to computing and or computer science,
then I say it is probably quite on topic. Missing any of the first two elements, it might not be well received and might disappear. Then again, we might expect a question of Physics or Math to go away missing these sorts of things as well.
You might test the waters with borderline questions, but I advise against it. If you truly think you have a good CS question that is on topic, and you really want answers, then post it.
While this overall question is still important in this phase, we already discussed this in the definition phase. I saw several CS questions that passed unscathed and even well received in the definition phase, and coming up with further unposted sample questions might not be so necessary. Ask your actual well researched and interesting history of computer science question in main, and we can sort the rest out from there.