The IBM MDA also had a 6845, and since it was driving a fixed-frequency monitor of extremely simple design, any deviation from the standard timings could definitely let the magic smoke out of the flyback transformer.
replyIn 1978 I built a single board computer with a 6800 uP and a 6845 to drive the display. Made a keyboard for it, and it worked.
replyUnfortunately, in my many moves it has disappeared, though I still have the schematics for it.
Somehow I missed the boat on being a billionaire!