1) Write down the operation modes of 8255.
2) Explain the purpose of control word written to control register in 8255?
3) What is the size of ports in 8255?
4) What do you mean by memory mapping and I/O mapping?
5) What do you mean by an USART?
6) Explain the use of 8251 chip?
7) Write down the major components of the keyboard/Display interface.
8) What do you mean by Key bouncing?
9) Explain the use of stepper motor?
10) Design the status word format for 8254.
11) What do you mean by key bouncing?
12) Write the function of crossbar switch?