Hi Paul,
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In order to prepare a new 2GB uSD card to work with SIO, you need to partition it correctly. I couldn't figure out how to do it from scratch. So I copied the Partition Table from the original uSD (MassStorageDevice(2GB).ptf) and Restored it on a new one using a freeware called DiskGenius. I am attaching the Partition Table. Once you Restore the partition table, either you can save the files from the .zip on Lee's website or use the attached "Restore from partition image files" function (Z80-SIO.pmf).
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Doing so I have functioning new uSD cards with no problem.
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Regards,
Kerem
Kerem Kapkin