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rax101get input/output permission8 bit
rbxfromfrom portaddress32 bit
rcxnumand to num ports32 bit
rdxturn_ona c++ value = 18 bit

The ports from 0 to 0x3FF are posible. To get permission to upper ports you have to use IOPL(110).

On returnrax

Errorcodec++ nameDescription
9EBADFBad file number
14EFAULTBad address
22EINVALInvalid argument
25ENOTTYNot a typewriter

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