1) Why Polled I/O use less hardware interface circuitry between I/O device and processor then Interrupt I/O?

What I think is: the resources used depend only on the number of wires or the distant between the devices, why the resources are related to the technique of transmission?

2) Programmer has complete control over the entire process (Polled I/O Technique). What is the relation between programmer and the transmission technique? (what specifically are the tasks of programmers when they work with transmission techniques? e.i. what are their code’s functionalities?)

3) Easiest method to test and debug (Polled I/O technique)
I have same questions with 2). I guess it is because that I am not clear about the relation between programming and transmission so I cannot deduce the reasons myself.

[Jason] I have not mentioned about programming, and could not understand why there is a relationship between programming and transmission. I’ll suggest you stay back after the lecture on Monday to clarify the matter with me.Best regards,