Computer Memory- RAM, ROM 

Interrupts

An event external to the currently executing process that causes a change in the normal flow of instruction execution is called interrupts On getting an interrupt, CPU
(a)Finishes the current instruction and moves to interrupt service routine
(b)Immediately moves to interrupt service routine without completing current instruction
(c )Release the control on ILO lines and memory lines
(d)make the peripheral device, which requested the interrupt wait for fixed interval of time 
Ans :  (b)

RAM & ROM
Memory which is usually termed as main memory of the system
Ans : RAM 
RAM is a volatile memory. Because it loses its data when computer is turned off.
RAM is a temporary memory.
RAM is located on the motherboard. 
ROM is a non - volatile memory because it doesn’t lose its data even after computer is turned off.
We can’t change the data stored in ROM.

Types of RAM
VRAM (Video RAM) - Special purpose 4 memory used by Video adapters to store image data for a computer display
SGRAM (Synchronous Graphics RAM)- It is a clock synchronized RAM that is 4 used for Video Memory.
MDRAM (Multibank Dynamic RAM). It  is a high perfomance RAM that divides memory into multiple 32KB parts or banks that can be accessed individually.
RDRAM (Rambus Dynamic RAM) - It is a video RAM.
SDRAM is faster than regular DRAM because - it runs synchronously with the system clock

SECONDARY MEMORY
Secondary memory stores data permanently.  
Secondary memory is also known as external memory.
Examples: Magnetic tape. Magnetic Discs (Hard Disc, Floppy Disc),Optical Discs, Flash drives
A magnetic tape is a recording medium consisting of a thin tape with coating of fine magnetic material used for recording data. 

Hard Disk
A hard disk is usually used inside the CPU. 
A hard disk is divided into tracks and sectors.
 The activity of creating sectors and tracks on a hard disk is called 
(a) Tracking (b) Sectoring
(c ) Plattering (d) Formatting
Ans :  (d) Formatting
The normal size of a Hard drive sector is 
Ans : 512 bytes
A hard disk used for storage externally as a substitute for portable storage is known as External hard disk 

Floppy Disk
Floppy disk was discovered by
Ans : Alan Shugart
Size of a common floppy disk 
Ans : 3.5 inches
3.5 inches size floppy drives and floppy disks are developed by
Ans : SONY
8 inches size floppy disks are developed by 
Ans : IBM
Storage capacity of a common floppy disk -
Ans : 1.44 MB
The part of the computer where floppy disks are inserted is known as
Ans : Floppy disk drive

Optical discs
Examples of optical disc are
Ans : CD, DVD, Blu ray disc
Data on optical disc is stored in the form of light and dark pits.
CD - Compact Disk
Storage capacity of a standard CD
Ans : 650- 750 MB (70 minutes of audio)
Diameter of a standard CD
Ans : 12 cm
The term “Red book”, “Yellow book” and   “Orange book  refer to
Ans : CD ROM Standard
DVD - Digital Versatile Disk (formally known as Digital Video Disk)
Storage capacity of a common DVD 
Ans : 4.7 GB
Optical disk having high storage capacity 
Ans : Blu-ray disk
Storage capacity of a standard single layer Blu -ray disc
Ans : 25 GB
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