Amrita Vishwa Vidyapeetham 2007 M.C.A Digital Computer Systems - Question Paper

M.C.A. Nov -Dec 2007
Digital Computer Systems
Time : 3 hours Maximum : 100 marks
ans any 5 ques..
All ques. carry equal marks.
1. (a) Explain the different complement systems in binary numbers.
(b) Discuss about gray code and BCD code.
2. (a) Explain multiplexer with suitable diagram.
(b) Describe half adder with neat diagram.
3. (a) Explain the working principle of JK flip-flop.
(b) Describe the working of BCD counter.
4. (a) Explain the shift registers.
(b) Write detail note on Half subtractor.
5. (a) Simplify the subsequent Boolean function in sum of product form by means of four variable map. Draw the logic diagram with NAND gates
(0, 2, 8, 9, 10, 11, 14, 15)
(b) Write about encoder.
6. (a) Explain the design of accumulator logic with control of AC registers, adder and logic unit.
(b) Describe the need for secondary storage devices.
7. (a) Explain different interrupts and their priorities in micro processors.
(b) Describe the various kinds of RAM.
8. (a) What is I/O interface? Why we need I/O interface? discuss with an example. (10)
(b) Explain the DMA transfer with the necessary diagrams.

Earning:   Approval pending.