bca2020 smu bca fall 2014 IInd sem assignment

Fall  2014, Assignment

PROGRAM – BCA (REVISED FALL 2012)

SEMESTER - 2

SUBJECT CODE & NAME - BCA2050/IMC2050 COMPUTER ORGANISATION

BK ID - B1642CREDIT – 4MAXIMUM MARKS - 60

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Qus:1 What is difference engine? Briefly explain the structure of Babbage’s Difference Engine.

Answer:

Difference Engine:

The difference engine was designed to calculate theentries of a table automatically and transfer them via steel punches to anengineer’s plate from which the tables could be printed. The only arithmeticoperation performed by this machine was addition. However using amathematical

Qus:2 What is the difference between fixed and floating point numbers?

Answer:

Fixed and Floating Point Numbers:

Fixed Point :

The term ‘fixed point’ refers to the corresponding manner in which numbersare represented, with a fixed number of digits after, and sometimes before,the decimal point. With floating-point

Qus:3 List the fundamental design issues in designing an instruction set.

Answer:

The fundamental design issues in designing an instruction set:

·         Operation Repertoire: How many and which operations to provide, and how complex operations should be?

·         Data Types: The various types of data upon which operations are performed.

·         Instruction Format: Instruction length (in bits), number of addresses, sizes of various

Qus:4 Briefly explain the read and write cycle of an 8086 processor.

Answer:

After understanding of the instruction cycle of the processor, now let uslearn about the Read-Write cycles. Read Cycleis Data Transfer fromMemory or Input/output (I/O) to CPU. Write Cycle is Data Transfer fromCPU to Memory or I/O.

Qus:5 Write a note on: Indirect Cycle and Interrupt cycle.

Answer:

Indirect Cycle and Interrupt cycle:

Indirect Cycle:

Once the instruction is fetched, the next step is to fetch source operands. Using the same example let us assume a one byte instruction, with direct or indirect addressing. Now if the instruction

Qus:6 Briefly explain the types of Random-Access Memory and ROM.

Answer:

The types of Random-Access Memory and ROM:

·         Dynamic RAM (DRAM): Example: Charge in capacitor. It requires periodic refreshing.

·         Static RAM (SRAM): Example: Flip-flop logic-gates. Applying power is enough (no need for refreshing). Dynamic RAM is simpler and hence smaller than the static RAM. Therefore they are denser and less expensive. But it requires supporting refresh circuitry.

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