Question Papers of IGNOU BCA CS64

CS64: Introduction to Computer Organisation
Year: 2006 TEE: December Time 3 Full Marks 75
Question number 1 is cumpulsory. Answer any three questions from the rest.

Q.1(e): Convert the two's complement number 1101 1010 to decimal equivalent.

Q.1(f): Simplify the following boolean function using sum of product form, by K-map:
F(A, B, C, D) = Σ (0, 2, 4, 6, 9, 12, 14)
and design the circuit.: [6]

Q.1(g): Assume that in a 8086 microprocessor the registers have following values:
BX = 678BH
SI = 23A4H
Offset/displacement = 8085H
Find the effective address using the above data for the following addressing modes:

  1. Register Indirect Address (using SI)
  2. Register Addressing (Using BX)
  3. Displacement Addressing using base register BX
  4. Based-Index Relative Addressing of 8086 microprocessor.
: [6]

Q.1(h): Why is a multiplexer required? How is it different from a decoder? Draw the circuit diagram of a 4 x 1 multiplexer and a 2 x 4 line decoder with enable input and also give the corresponding truth tables.: [6]

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