Difference between revisions of "Category:84PCE:Ports:By Address"

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(Also updated to reflect discovery of MMIO)
 
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''Nota bene:'' In normal operation, IN is censored, and OUT causes an NMI (or reset?). Except for the 00xx range of ports, all other ports can be accessed by user code using memory-mapped I/O.
 
''Nota bene:'' In normal operation, IN is censored, and OUT causes an NMI (or reset?). Except for the 00xx range of ports, all other ports can be accessed by user code using memory-mapped I/O.
  
Also note that all ports in the 2xxx and Fxxx ranges all read zeros and may be unused and have no function.
+
Also note that all ports in the Fxxx range read all zeros and may be unused and have no function.

Latest revision as of 15:55, 17 April 2015

See also list of ports by name

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Nota bene: In normal operation, IN is censored, and OUT causes an NMI (or reset?). Except for the 00xx range of ports, all other ports can be accessed by user code using memory-mapped I/O.

Also note that all ports in the Fxxx range read all zeros and may be unused and have no function.