SD DISKII Plus can read PO disk image

Hi Friends,

I would like to add PO image format support on SD DISKII Plus.

In fact, the PO format is almost similar as 'DSK' format. 

and Just rename PO file to DSK, It would work.

It just has different sector order for prodos but, DOS3.3 also can read it.

IBM PC HDD using this idea as the interleave.

Anyway, I add converter function in it.

It works now and will include into new release firmware version.

Thank you;

Ian Kim