1) prepare down the various types of command words used in 8259a?
2) prepare down the operating modes of 8259a?
3) What do you mean by scan counter?
4) What is the output modes used in 8279?
5) prepare down the modes that are used in keyboard modes?
6) What are the modes used in display modes?
7) describe the use of modem control unit in 8251.
8) prepare down the register organization of 8257.
9) describe the function of DMA address register.
10) What is the use of terminal count register?
11) What is the function of mode set register in 8257?
12) prepare down the difference between the memories mapped I/O peripheral I/O.