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thanx sir
i need all this bcoz i want at any instant which one device is active or which one is not

thanx sir i need all this bcoz i want at any instanwhich one device is activ e or which one is not

Here is one list of PC I/O ports
http://mudlist.eorbit.net/~adam/pickey/ports.html

Some of those are the same in nowaday's PCs, some details have changed.

Nowadays it is not a good idea to try to access directly the hard disk drive, floppy drive, mouse port, keyboard port, soudn card etc... I/O ports. The operating system drivers do the communications with those systems nicely. If you try to mess up them yourself, you most propably cause something strange and potentially harmful (computer crashes etc..) to happen.

Parallel port is an interface you can pretty safely access in direct I/O port level on PC system.

hell dear i
i want to know as in parallel port interfacing we r using address/ interrupt address 0x378,0x 278 similarly what are the interrupt address for other ports . ex for c d drive, flopy drive , mouse port , key board interfacin port, mic port etc .
my alternate i d is [email protected]