Ah, good call. I was thinking of the sort of low-level simulator you'd want to play around with an unfamiliar architecture; but as the technical notes on that l

Ah, good call. I was thinking of the sort of low-level simulator you'd want to play around with an unfamiliar architecture; but as the technical notes on that link say, no single-stepping. Once you want to actually be able to slow things down enough to watch a system run, then it's typically harder to speed them up again, unless you truly have two separate emulation modes which can switch off. It's doable.