Hmm how would I check that? I can use a scope and try to see how long it takes to rise vs. +5V.

Would the machine boot without UB11 installed at all? I see RP7 pulls it up to 5V, is UB11 actually driving it high as well?

I don't have any other sound chips to swap in there, but I could wire UB10's RESET line to the system reset line (as well as the TEST* it's already hooked up to)