On Sun, Jun 11, 2023 at 09:21:52AM -0600, ben via cctalk wrote: [...] > I would of thought the AMIGA would have a say here, as it reads a disk > track as just a bunch of flux transitions.
The Amiga has a choice of two fixed clock rates, both of which happen to correspond with common DD disk formats of the day. A (digital) PLL is used to nudge the frequency to synchronise with the incoming flux transitions when reading, but that's to handle wow and flutter, not formats using a different clock. This is sufficiently-limiting that the Amiga cannot use standard HD drives, but needs a special drive which drops to 150RPM when HD media is inserted so that the clock speed remains the same.
