> 2: explain the struct of FDCtrl;

  In order to know what those fields in FDCtrl mean, you might need to read
  ftp://download.intel.com/design/archives/periphrl/docs/29047504.pdf first.
As the comment in hw/fdc.c says, it's Intel 82078 floppy disk controller
emulation.

Regards,
chenwj 

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

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