Intel 8272 based floppy controller & Missing Address Mark

Chuck Guzis cclist at
Thu Nov 28 10:24:42 CST 2019

On 11/28/19 7:06 AM, David Kuder via cctalk wrote:
> I've tried using the 8" drives as 8" drives with the clock input to the
> 8272 set correctly, and likewise with the 720KB 3.5" emulator (and even
> 360KB 5.25" emulation).  On physical and virtual disks I'm getting the same
> error trying to read or write data. Formatting steps through all the tracks
> without error, and I can see a write status indicator on the GoTek
> display...

You'd likely be better off with the 1.44MB or 1.2MB emulator, as 8"
disks used the 500KHz clock rate, not the 250KHz of the 360/730K.


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