Everything else worked... Original PC-XT with the optional MB with full 640K RAM, EGA Color, Dual Floppies and (originally) 10MB HD. The replacement when it died the first time was 40MB, but we could only address 32.
And a friend found me a Mil-spec 8087 Math Co, threw it in there - but it didn't help...
Where the hell would you even search for a MFM/RLL drive?