MAGNETIC DRUM

Target

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Memory hierarchy

Beauty

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Opticaldrives

cd rom

DVD rom

hard disk

Speed

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CD ROM

Multi Tasking

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CD ROM 52x Max

CD WRITER 52x/32x/52x

Here , x is equivalent to (In CD ROM) 150 kbps

(In DVD ROM) 1350kbps1.38Mbps (according to “DIGIT”)

DVD ROM 16x Max

DVD WRITER 52x/16x/16x/52x

A x B x CWrite Rewrite Read

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CD Capacity640 MB

700 MB

DVD Capacity DVD – 5 4.7 GB S S S L

DVD – 9 8.5 GB S S D L

DVD – 10 9.4 GB D S S L

DVD – 18 17 GB D S D L

About CD’ & DVDs’

Note :Mbps Mega bits per second

MBps :Mega bytes per second

Some Standards :Redbook [ Only Audio ]Yellow Book [ Only Audio and Data ]Orange Book [ Mixed (Audio + Video +Data)]

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harD disk

ZENITH

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Video display unitClarity

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VEDIO DISPLAY UNIT ORDEFALUT OUTPUT DEVICE ORMONITOR

CRT : VISUALIZATIONCONTROL CIRCUIT : GENERATING SIGNAL (CONTROLLED BY CPU)

Heater

Control Grid

CathodePre - Accelerating Anode

Anode( > 10KV )

Illuminatedspot

e- beam

Focusing Anode

Neck of CRTKrishna Kumar Bohra (KKB), MCA LMCST

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Focusing Anode

+

e-

-

e-

+

-

e- -

+e-

-

+

same ripples and opposite attracts - Raster Scan

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Printer Symmetric

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B

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IMPACT PRINTER

Dot Matrix Printer (DMP)

spring

pins

Head (9 pins) :

9 X 5 pins required for one character. . . . . .

Head (24 pins) :

8 X 3 pins required for one character

9X1

8X3

pins

. . . . . .

80 character per line &132 character per line

dps : Dot per secondcps :character per second

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Daisy Wheel :(plastic daisy) (Flower available in America)

Due to plastic character

Mechanism used in Electronic Typewriter

A Note :

128 character

Fonts are Fixed

Speed is Slow

1 character destroyed full replacement is required

Average Seek time is 64 skips

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Ccontd…