RGPV Previous Question Papers BE 4th Semester
Computer System and Organization Dec 2008
(Comman for CSEC IT. Engg.)
Note: Attempt all questions.
1. (a) Explain and draw a diagram of a bus system that use multiplex K, register of n bits each to
produce an n-line common bus.
(b) Define the following terms:
(i) Micro- operation (ii) control faction (iii) Three state buffer
(a) Given a32×8 ROM chip with an enable input. Show the external connections necessary to
construct a 128×8 ROM with four chips and decoder.
(b) What is instruction cycle? Explain different phase of instruction cycle and show flowchart for
2. (a) Define the following terms:
(i) Control memory (ii) Microinstruction
(b) Explain different section of micrprogrammed control unit with block diagram.
(a) Show a block diagram of a control memory and associated hardware needed for selecting the
next microinstruction address. Also explain how we select next microinstruction address.
(b) Formulate a mapping producer that provides four consecutive microinstruction for each
routine. The operation code has six bits and the control memory 2048 words.
3. (a) Show hardware to be used for addition and subtraction of two decimal number in singed –
magnitude representation. Indicate how in over flow is detected?
(b) Multiply the sing numbers by using Booth multiplication algorithm, number are (-9) and (-13).
Explain the necessary hardware and flowchart for algorithm of two fixed point binary number
in singed magnitude representation. Also show the divide flowchart condition.
4. (a) What is the basic advantages of using interrupt – initiated data transfer over transfer under
program control with an interrupt ?
(b) Explain with suitable diagram the working principle of DMA controller.
(a) What do you mean by interrupt? What are the various interrupt handling techniques? Explain.
(b) How many characters per second can be transmitted over a1200-baud line in each of the
(i) Synchronous serial transmission
(ii) Asynchronous serial transmission with two stop bits
(iii) Asynchronous serial transmission with one stop bit
5. (a) What are the write through and write- back methods in Chase organization and also explain
the concept of chase initialization?
(b) What is page fault? What techniques are used to handle page fault?
(a) What is CAM? Explain it with block diagram.
Define hit ratio. Calculate the average access time of memory for a computer with access
time of 100 ns, memory access time of 1000ns and a hit ratio of 0.9.