Date post: | 17-May-2015 |
Category: |
Technology |
Upload: | krishna-kumar-bohra |
View: | 568 times |
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MAGNETIC DRUM
Target
Krishna Kumar Bohra (KKB), MCA LMCSTwww.selectall.wordpress.com
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
Krishna Kumar Bohra (KKB), MCA LMCSTwww.selectall.wordpress.com
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)]
Krishna Kumar Bohra (KKB), MCA LMCSTwww.selectall.wordpress.com
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
Krishna Kumar Bohra (KKB), MCA LMCSTwww.selectall.wordpress.com
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…