Sardar Patel University 2007 B.E Computer Science Computer peripherals (CP313)(Internal ) - Question Paper

? Next the keyboard microprocessor generates an interrupt to inform the main processor about the scan code being available at the port. Once the main processor receive the interrupt signal it makes an interrupt service routine (ISR) for the keyboard service.
? This ISR in the BIOS reads the scan code from keyboard buffer and inform the keyboard that it can remove the code form the keyboard the keyboard buffer.
? Once the scan code is received, using a scan code table and the condition of different shift keys such as ALT, SHIFT, CTRL, CAPS LOCK etc, the BIOS converts the scan code into proper ASCII code.
? Finally, this ASCII code is stored into the computer’s main memory RAM, from user program can learn it and display this code’s equivalent character shape onto the screen.










Q – three [A] How configuration data is stored in computer

? Configuration data is stored in the computer in 1 of 3 devices :
a. DIP Switches
b. CMOS setup chip
c. Jumpers
a. DIP Switches
? DIP - Dual in-line package switch that has an ON position and OFF position. ON represents binary one and OFF represents binary 0
? Add or remove equipment by changing a DIP switch setting
? DIP switch setting can be changed by pointed instrument such as ballpoint pen to push the switch
b. CMOS setup chip
? Most configuration data in newer computers is stored in a battery-powered CMOS microchip.
? CMOSs require very little electricity to hold data. A small trickle of electricity from a nearby battery enables the CMOS chip to hold the data even while the main power to the computer is off
? Data stored in the CMOS can be changed by accessing the setup program stored in ROM BIOS
c. Jumpers
? Jumper consists of 2 pins sticking up side by side, with a cover over the 2 pins making a connection. The 2 pins and the connection together serve as electrical connectors on the system board
? If the pins are not connected with a cover, the setting is considered OFF. If the cover is present, the setting is ON


[B] List out various part of System Board

Chip set RAM (RIMM or DIMM) AGP slot for video card
Battery BIOS (ROM BIOS chip) PCI slot for high-speed I/O Devices
CPU & CPU socket BUS lines ISA slot for slower devices
CMOS chip System board crystal Jumpers
Parallel/serial/USB ports Hard drive controller DIP switches






[C] Significance of Expansion slot
? Circuit boards other than the system board inside the computer are sometimes called expansion cards, interface cards and are mounted in expansion slots on the system board
? For example, a card which is plugged into the expansion slot to control video is called video card. A sound card and network card are also used for sound and network systems
? With parallel transmission, streams of bits flow parallel to every other while with serial transmission single-file bits flow in 1 long stream.
? A network card for example has a port designed to fit the network cable and an internal modem has 1 or 2 telephone jacks as its ports.
? All cards enable the CPU to connect to an external device
? Some slots are listed beneath with their properties:
? AGP(Accelerated graphics port) slot for video card
? PCI(peripheral component interconnect) slot for high-speed I/O Devices
? ISA(Industry Standard Architecture) slot for slower devices
? The size and shape of an expansion slot are dependent on the type of bus it is using. Slots can be identified by their length, by the position of the breaks in the slots, and by how far from the edge of the system board a slot is positioned.


[D] Encode 01001101 data bits for FM and MFM method
FM is known as Frequency Modulation in which 0 is encoded by PN and one is encoded by PP. so the encoding of subsequent bits by FM is
01001101 – PN PP PN PN PP PP PN PP – 12 PULSES
MFM is known as replaced Frequency Modulation in which one is encoded by NP
, 0 preceding by one is NN and 0 preceding by 0 is PN
01001101 – NN NP NN PN NP NP NP NN NP – six PULSES (First 0 is preceded by 0) 001001101 – PN NP NN PN NP NP NP NN NP - seven PULSES (First 0 is preceded by 1)










[E] What do you mean by Plug and Play Bios?

? Definition: A feature of system BIOS, Windows 9x, and Windows 2000 that automatically installs new hardware devices and assigns resources to them.
? Basic input/output system chip(s) residing on the system board that control(s) normal I/O to such areas as system memory and pen drives (floppy drives). Also called on-board BIOS.
? Plug and Play BIOS uses 4 resources for communication ranging from hardware and software which are discussed beneath
? Hardware devices signal the CPU for attention using an IRQ which means a line on a bus that is assigned to a device and is used to signal the CPU for servicing. These lines are assigned a reference number (for example, the normal IRQ for a printer is IRQ 7)
? Software addresses a device by 1 of its I/O addresses which are numbers that are used by devices and the CPU to manage communication ranging from them
? Software looks at memory as a hardware device and addresses it with memory addresses which are numbers that are assigned to physical memory located either in RAM or ROM chips.
? DMA (Direct Memory Access) channels are used to pass data back and forth ranging from a hardware device and memory.

Earning:   Approval pending.