Sure, luckily nobody needs to understand the whole stack. I feel I do but that's just a mix of age + unusually varied projects, not necessity.

Have to admit I don't recall a 200Mhz bug, and all modern search results are about GPUs. As for DPMI, well back then I was just a kid and 640kb was enough for any kid ;) Then Windows came along and solved all that. I definitely knew what it was though because all the games used dos4gw...