Ah, but the 630 DOS card is a really bizarre creature, much different than most of Apple's other forays into the territory; it plugs directly into the '040 socket. The '040 and the 486 reside on the same daughterboard, with additional connectors plugging into the PDS (interestingly, the PDS...
Welp, I'm gonna take the plunge. I just ordered a handful of 216K resistors from "Surplus Sales of Nebraska," as they were pretty much the only place I could find 'em. They claim to be 5-watt, 1%. I'll definitely test 'em and post results when they arrive. Here's a link if anyone else is having...