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Problem with ATA/ Atapi interface

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ne2000

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help ata/atapi interface

hi!

I am learning to use 8051 control hardisk . the circuit diagram same with https://www.pjrc.com/tech/8051/ide/index.html.

When execute " IDENTIFY DEVICE" ATA command. my Seagate 1.0 g return 256 word. but Quantum Fireball lct 10 5.1g can't return any word. the status register ==0x50
Any one can helo me?
 

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