Discussion
In 8259, to avoid causing an interrupt due to an accidental noise pulse, the following action is done :
Answer: C
In the 8259 programmable interrupt controller, an interrupt request input that is left unconnected may pick up an accidental noise pulse and cause a false interrupt, so every unused interrupt line is connected to ground, which holds it permanently low and inactive. The key gives this action. Shorting the unused lines together would only join their noise, connecting them to Vcc would hold them at the active level for a level-sensitive input, and leaving them open is the situation the question wants to avoid, since an open input floats and picks up noise. The answer is that all unused interrupt lines are connected to ground.
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