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hi,

dear u can increase the i/p, o/p number of ports by interfacing it with chip 8255,, that's the main idea, further how to interface it with the processor (preferably 8086),,,u must have a look of configuration and working of 8255,, for that you can chek this follow this link

http://www.scribd.com/doc/24040301/8255-Programmable-Peripheral-Interface

Regards: Badeekh Akbar.

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