Do they still have the chunky old process nodes that can make such chips? Some vintage chips there is modest demand for (such as ASICs from cherished vintage computers; think the SID chip, for example) cannot be economically revived as there are no more facilities to fab chips of those long-obsolete technologies. (And even the trickle of 6502s being made are a later CMOS redesign rather than the original design.)
palordrolap@fedia.io 8 hours ago
No idea. I did find that WDC are still making a variant of the 16-bit successor to the 6502, so I hadn't considered that the tech might not still be around for the earlier generation.
It was only very recently that they stopped making Z80 cores for embeddable use, so if that tech was mothballed rather than thrown out it, theoretically it wouldn't take long to spin all that back up again.
That "theoretically" might just be an uninformed dream though.