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Also, the Lynx will NOT write anything to the HFE disk unless I force pin 34 low (short it). The HxC device works fine with the Amiga, ST and an old XT, so I think the HxC is fine. The Lynx FDC just seems supper fussy on the RDY line.
Having pulled all the ICs off the Lynx FDC to verify Frank's design, I realized I missed soldering pin IC13:11.
That was the RDY problem. Now it writes fine without shorting pin 34 of SKT2/3.
The HxC format problem is most likely due to the Lynx trying to format track 41. A real 200K drive will fail and the Lynx will determine it is a 200K drive. I think the HxC accept the track 41 format but since it is a 200K disk image it doesn't actually work. I might need an HxC firmware update to make this work, but it is not really a problem since I can make new blank virtual disks by simply copying the blank Lynx HFE disk back to the SD card.