Fred, The Victor/Sirius 9000 was sort of PC compatible and featured a varial speed floppy format, no?
Sellam On Thu, Nov 3, 2022 at 3:09 PM Fred Cisin via cctalk <cctalk@classiccmp.org> wrote: > >> Note that some disk types are CLV, not CAV (e.g. some Mac disks), and > >> reading them without additional hardware support may be problematic. > > On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote: > > Is Constant Linear vs Angular Velocity (?) anything I need to worry > about > > when sticking within the IBM PC compatible line from say '90 forward? > > NO. > PC [compatible] was fixed rotational speed of 300 or 360 RPM. > Well, Weltec? made a 180 RPM drive, to be able to use 1.2M on 5150/5160, > and there are many other bizarre oddities. > > CLV, or "zone" recording, with vaarying motor speed CAN be worked around > with a constant motor speed, by varying the data transfer rate, . . . > but NO PC [compatible] machines used variable speed floppies, other than > 300RPM and 360RPM. >
