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Index > OS Construction > What did OUT DX,EAX do?

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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2
neither
Code:
OUT DX, AL
OUT DX, AH
OUT DX, A(16-23)
OUT DX, A(24-31)    
nor
Code:
OUT DX, AL
OUT DX+1, AH
OUT DX+2, A(16-23)
OUT DX+3, A(24-31)    
Post 31 Aug 2015, 16:03
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17667
Location: In your JS exploiting you and your system
revolution
It puts the 16-bit address in DX on the address bus, and the 32-bit data on the data bus. But it is up to the device on the bus to determine what it should do with those bits and whether or not to use all bits or just some.

Moving to OS Construction
Post 31 Aug 2015, 16:18
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