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Computer

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Computer Fundamental What Is Computer?
Kw¤úDUvi wK? Computer kãwUi mvaviY A_© n‡”Q MYK hš¿| j¨vwUb kã Compute †_‡K Bs‡iRx Computer k‡ãi DrcwË| Compute kãwUi A_© MYbv ev wnmve wbKvk Kiv| Kw¤úDUv‡ii mvnv‡h¨ g~jZt †hvM, we‡qvM, ¸Y, fvM BZ¨vw` Kvhv©ejx m¤úv`b Kiv hvq| wKš‘ eZ©gvb hy‡M Kw¤úDUv‡ii eûgyLx e¨env‡ii d‡j Kw¤úDUv‡ii ms½v A‡bK e¨vcKZv jvf K‡i‡Q| †Kvb mxwgZ ms½v w`‡q Avi Kw¤úDUvi‡K MÛxe× Kiv hvq bv|

Who Is The Inventor Of Computer?
Kw¤úDUvi -Gi Avwe®‹viK ‡K? wewkó weÁvbx weªwUk MwYZwe` Pvj©m e¨v‡eR AvaywbK Kw¤úDUv‡ii g~jbxwZ wbav©iY K‡ib| ‰eÁvwbK cÖhwy ³i Afv‡e e¨v‡e‡Ri GB g~jbxwZ ev¯—evqb Kiv m¤¢e nqwb| ZeyI Zvui GB hyMvš—Kvix wPš—vfvebv Ges cÖ‡Póvi Rb¨ Zvu‡K AvaywbK Kw¤úDUv‡ii RbK ejv nq| 1887 mv‡j Wv³vi nvigvb n‡jwi_ Av‡gwiKvi Av`gïgvixi KvR `ª“Z m¤úv`‡bi Rb¨ Pvj©m e¨v‡e‡Ri g~jbxwZ wb‡q M‡elbv ïi“ K‡ib| c‡i 1911 mv‡j `yÕwU wfbœ ‡Kv¤úvbxi mn‡hvMxZvq wZwb KgwcDwUs, †Uey‡jwUs I †iKwW©s †Kv¤úvbx cÖwZôv K‡ib| hv c‡i wek¦ weL¨vZ IBM (International Business Machine) -G iƒcvš—wiZ nq|

Computer Structure:
Kw¤úDUvi Gi MVb cÖbvjxt Computer g~jZt wZbwU As‡k wef³| †hgb t 1. Input Device. D`vniYt Kx †evW©, gvDm, Rqw÷K, MÖvwd· c¨vW, ¯‹vbvi BZ¨vw`| 2. Central Processing Unit (CPU) 3. Output Device. D`vniYt gwbUi, wcÖ›Uvi, w¯úKvi cÖfw„ Z|

BbcyU wWfvBm

MvwbwZK hyw³ Ask -----------^----------‡m›Uªvj BDwbU --- > -----------^----------¯§„wZ GjvKv

AvDUcyU

wWfvBm

Kw¤úDUvi I gvby‡li g‡a¨ cv_©K¨t Kw¤úDUvi I gvby‡li g‡a¨ cv_©K¨ n‡jv Kw¤úDUvi †h †Kvb Kv‡Ri djvdj AwZ `ª“Z MwZ‡Z cÖ`k©b K‡i| wKš‘ gvbyl Zv cv‡i bv| Zv m‡Ë¡I gvbyl Kw¤úDUv‡ii †P‡q eyw×gvb| Kvib Kw¤úDUvi gvby‡li nv‡Z Mov GKwU B‡jKUªwb· hš¿| Zvi †P‡q eo KviY n‡jv Kw¤úDUv‡ii wbR¯^ †Kvb eyw× †bB| gvbyl hw` Zvi ¯§„wZ ev †g‡gvix‡Z md&UIqvi †mU K‡i †`q Zvn‡j †m H md&UIqv‡ii mvnvh¨ wb‡q Avgv‡`i mvg‡b Z_¨ cÖ`vb Ki‡e| Zvi †ekx ev Kg Ki‡e bv|

Deference Between Computer & Human Being:

Classification Of Computer:
Kw¤úDUvi Gi MVb cÖbvjxt MVb I D‡Ïk¨ †f‡` Kw¤úDUvi‡K `yB fv‡M fvM Kiv hvq| h_vt Analog Computer Digital Computer GQvov Dc‡iv³ `yB ai‡Yi Kw¤úDUvi Gi mswgkª‡b Av‡iKwU Kw¤úDUvi ˆZix n‡q‡Q| Gi bvg Hybrid Computer| Note : wWwRUvj Kw¤úDUvi‡K Avevi Pvi fv‡M fvM Kiv nq| h_vt 1. mycvi Kw¤úDUvi 2. †gBb‡d«g Kw¤úDUvi 3. wgwb‡d«g Kw¤úDUvi 4. gvB‡ v Kw¤úDUvi ev, cv‡m©vbvj Kw¤úDUvi| wb‡P Gi m¤ú‡K© Zz‡j aiv nj|

Classification Of Digital Computer: wWwRUvj Kw¤úDUvi Gi MVb cÖbvjxt Super Computer. D`vniYt fvi‡Zi wbR¯^ ˆZix K…Z mycvi Kw¤úDUvi ÔcigÕ| GQvov i‡q‡Qt Cray-1, Cyber-205. Mainframe Computer. D`vniYt UNIVAC 1100/11, IBM 6120, NCR N8370, IBM 4341. Miniframe Computer. D`vniYt PDP 11, NOV A3, IBM S/34, IBM S/36. Micro Computer. D`vniYt eZ©gv‡b Avgiv †h me Kw¤úDUvi †`wL Zvi meB n‡”Q gvB‡ v ev, cv‡m©vbvj Kw¤úDUvi| G‡`i g‡a¨ i‡q‡Q : Apple 64, IBM PC, TRS 80 cÖf„wZ|

Created by: Md. Kamrul Hassan Bappy

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Computer Fundamental Measurement Of Data Of The Computer:
Computer -Gi Z_¨ cwigv‡ci GKKt evBbvix bv¤^vi c×wZ‡Z e¨eüZ AsK 0 (ïb¨) Ges 1 (GK) ‡K Bit e‡j| Bs‡iRx Binary k‡ãi Bi I Digit k‡ãi t wb‡q Bit kãwU ˆZix n‡q‡Q| Kw¤úDUvi ¯§„wZ‡Z iw¶Z 0 I 1 Gi †KvW w`‡q wewfbœ Z_¨ msiw¶Z _v‡K| G Kvi‡Y Kw¤úDUv‡ii ¯§„wZi aviY ¶gZvi ¶y`ª GKK wnmv‡e Bit kãwU e¨eüZ nq| Kw¤úDUvi GB 0 I 1 Øviv †h we‡kl c×wZ‡Z Kw¤úUv‡ii KvR K‡i Zv‡K Kw¤úUv‡ii hvwš¿K fvlv ejv nq|

Bit, Byte, KB,MB,GB Ges Gi g‡a¨ m¤úK©t
Kw¤úDUv‡ii ¯§„wZ‡Z weU, evBU ev Kw¤úDUv‡ii kã avi‡Yi msL¨v Øviv aviY ¶gZv wb‡`©k Kiv hvq| mvavibZt evBU w`‡q ¯§„wZi aviY ¶gZv cÖKvk Kiv nq| Z‡e ejv `iKvi †h weU n‡”Q Kw¤úUv‡ii msL¨v c×wZi ¶z`Zg GKK| G‡`i g‡a¨ m¤ú©K ª wb‡P Zz‡j aiv njt 8 Bit = 1 Byte 1024 Byte = 1 Kilobyte(KB) [1 Byte = 1 Character]

1024 Kilobyte = 1 Megabyte (MB) 1024 Megabyte = 1 Gigabyte (GB) 1024 Gigabyte = 1 Terabyte (TB)

How Many Parts Of A Computer?
Kw¤úDUvi Gi KqwU Ask I wK wK? There are two parts of a Computert Hardware: Kw¤úDUv‡ii mKj cÖKvi hš¿ ev, hš¿vsk‡K Hardware (nvW©Iq¨vi) ejv nq| Software : wb®cÖvb nvW©Iq¨vi‡K Kvh©¶g K‡i mw q K‡i †Zvjvi Rb¨ e¨eüZ ‡cÖvMÖvgB n‡”Q mdUIq¨vi|

What Is Memory?
¯§„wZ wK? gvby‡li g‡Zv Kw¤úDUv‡iiI †g‡gvix ev, ¯§„wZ i‡q‡Q| Kw¤úDUv‡ii ¯§„wZ‡K `yB fv‡M ch©vwqZ Kiv hvq| h_vt 1. cÖavb ¯§„wZ (Main memory) †hgbt RAM, ROM| 2. mnvqK ¯§„wZ (Auxiliary memory) †hgbt d¬wc wW‡¯‹U, nvW©wW¯‹, Kgc¨v± wW¯‹ cÖfw„ Z|

What Is RAM? i¨vg wK? RAM (Random Access Memory) GKwU A¯’vqx (Volatile) ¯§„wZ fvÛvi | Input Device n‡Z mKj cÖKvi Z_¨ RAM G Rgv nq| cÖavb ¯§„wZi G As‡k hLb ZLb bZzb Z_¨ †jLv hvq, Z_¨ cov hvq Ges B”Qv Ki‡j Z_¨ mg~n gy‡Q †djv hvq| RAM -Gi Z_¨ cov I †jLv Dfq KvRB m¤úv`b Kiv hvq e‡j G‡K wjLb cVb ¯§wZI (Read Write Memory) ejv n‡q _v‡K| we`y¨r mieivn eÜ n‡j RAM G iw¶Z mKj Z_¨ gy‡Q hvq| ZvB G‡K A¯’vqx ¯§„wZ wnmv‡e AwfwnZ Kiv nq|

What Is ROM? ig wK? ROM (Read Only Memory) GKwU ¯’vqx (Non Volatile) ¯§„wZ fvÛvi| cÖavb ¯§„wZi GB AskwU ¯’vqx, AcwieZ©bxq I AaŸsmvZ¡K ¯§„wZ| Computer -G we`y¨r mieivn eÜ K‡i w`‡jI GB ¯§„wZ‡Z iw¶Z Z_¨ gy‡Q hvq bv| ROM -G bZzb wKQy ms‡hvRb, ms‡kvab ev cwieZ©b Kiv hvq bv| GB As‡k wjwLZ Z_¨ ïaygvÎ cov hvq, wKš‘ †jLv hvq bv| ZvB G‡K ¯’vqx ¯§„wZ wnmv‡e AwfwnZ Kiv nq|

Created by: Md. Kamrul Hassan Bappy

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Computer Fundamental What Is Disk? wW¯‹ wK? Computer Gi hveZxq Z_¨ msi¶Y Kivi Avavi †K Disk e‡j| Disk `yB ai‡bi n‡q _v‡K| †hgbt 1. Floppy Disk 2. Hard Disk. GQvovI evRv‡i AviI GK ai‡bi Disk cvIqv hvq hvi bvg Compact Disk (CD). wW¯‹ Gi aviY ¶gZv wbæwjwLZ: Floppy Disk: 1.44 Megabyte (MB) [ For 31/2 Floppy Disk ] Compact Disk: 150 Megabyte (MB) †_‡K 800 Megabyte (MB) Hard Disk: 15 Gigabyte (GB) †_‡K 800 Gigabyte (GB) DVD Disk: 700 Megabyte (MB) †_‡K 12 Gigabyte (GB)

What Is Operating System?
Operating System wK?
Operate (Pvjv‡bv) ‡_‡K Operating k‡ãi DrcwË| k‡ãi AvwfavwbK A_© n‡jv cwiPvjbv Kiv| Avi System k‡ãi A_© n‡jv c×wZ| Operating System ej‡Z Kw¤úDUvi cwiPvjbv Kivi c×wZ‡K eySvq| Operating System ej‡Z cwiPvjbv Kiv eySvq bv| hLbB Avgiv †Kvb Kw¤úDUvi Pvjy Ki‡Z hvB Zvi c~‡e© Avgv‡`i‡K Rvb‡Z n‡e Kw¤úDUv‡i Operating System Av‡Q wKbv| †Kbbv Operating System Kw¤úDUv‡ii mg¯— Ask wbqš¿b K‡i| Zvjve× GKwU N‡i cÖ‡ek Ki‡Z n‡j ‡hgb Pvwei cÖ‡qvRb nq, bv n‡j XyKv m¤¢e bq| †Zgwb fv‡e Kw¤úDUvi Pvjv‡Z cÖ‡qvRb nq Operating System. †hgbt DB‡ÛvR, BDwb·, wjbv·, g¨vK IGm, cvIqvi I‡cb cÖf„wZ|

What Is Startup Disk?
÷vU© Avc wW¯‹ wK? Acv‡iwUs wm‡÷gi ‡hme dvBj †jvwWs Gi gva¨‡g Kw¤úDUvi Pvjy nq †m¸‡jv n‡”Q ÷vU© Avc dvBj| Ges Kw¤úDUv‡ii †h ¯§„wZ‡Z GB ÷vU© Avc dvBj¸‡jv msiw¶Z _v‡K Zv n‡”Q Acv‡iwUs wm‡÷g| mvavibZ GUI B›Uvi‡dm mg„× DB‡Ûv‡Ri ÷vU©Avc wW¯‹ wn‡m‡e nvW©wW¯‹ Ges Dos ‡gv‡Wi Rb¨ ÷vU© Avc wW‡¯‹U wn‡m‡e d¬wc wW¯‹ e¨eüZ nq|

What Is Windows?
Windows wK?
Windows n‡jv Microsoft Corporation KZ…©K evRviRvZK…Z GKwU kw³kvjx Operating System. Windows Operating System -Gi Aax‡b A‡bK¸‡jv Application Software _v‡K hv †m cwiPvjbv K‡i _v‡K| DOS (Disk Operating System) -Gi Aax‡b †h me Application Software _v‡K †m¸‡jv Avgiv DOS Command Gi gva¨‡g cwiPvjbv Kwi| DOS Command -Gi RwUjZv `~i Kivi Rb¨ Microsoft Corporation Windows Operating System wU †ei K‡ib| GLv‡b Application Software ¸‡jv cwiPvjbvmn mKj KvR Mouse I Keyboard Gi mgš^‡q Lye mn‡R Kiv hvq|

Various Types Of Windows Operating System’s Verson:
Windows Acv‡iwUs wm‡÷‡gi fvm©‡bi wewfbœZvt
Av‡MB ejv n‡q‡Q DB‡ÛvR GKwU kw³kvjx Acv‡iwUs wm‡÷g| ïay ZvB bq GwU †hgb BDRvi †d«‡Ûjx †Zgwb eûj e¨eüZ GKwU Acv‡iwUs wm‡÷g| GwUi wewfbœ fvm©b i‡q‡Q| ‡hgbt Windows 98, Windows 2000, Windows ME. eZ©gv‡b bZzb e¨eüZ DB‡ÛvR n‡”Q Windows XP. GQvovI ‡bUIqvwK©s Gi Rb¨ e¨eüZ Acv‡iwUs wm‡÷g nj Windows NT. Acv‡iwUs wm‡÷‡gi wfbœZvi `i“b G‡K bvbv ai‡bi fvm©‡b fvM Kiv nq| DB‡ÛvR 95 Gi Av‡Mi Kvi Acv‡iwUs wm‡÷g ¸‡jv wQj 16 we‡Ui| Gici 95, 98, 2000, Gg B, GbwU GB ms¯‹iY ¸wj wQj 32 we‡Ui| eZ©gv‡b DB‡ÛvR G·wc evRv‡i Av‡Q| GwU 64 we‡Ui Acv‡iwUs wm‡÷g Ges Ab¨vb¨ Acv‡iwUs wm‡÷g¸‡jvi †P‡q me©v‡c¶v †ekx cvidi‡gÝ w`‡Z m¶g| gvB‡ vmdU cieZ©x‡Z DB‡ÛvR jsnb© GwWkb evRv‡i Qvoevi c`‡¶c wb‡”Q|

Created by: Md. Kamrul Hassan Bappy

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Computer Fundamental What is Computer’s Booting Process?
Kw¤úDUv‡ii eywUs cÖ‡mm wK? Kw¤úDUvi Ab Kivi ci †h Kvj ¯Œx‡b Kw¤úDUv‡ii nvW©Iq¨vi I Ab¨vb¨ m¤úwK©Z wewfbœ Z_¨ Avm‡Z _v‡K ZvB Kw¤úDUv‡ii eywUs cÖ‡mm| GB mg‡q ÷vU© Avc wW¯‹ n‡Z Z_¨ i¨v‡g P‡j Av‡m Ges ev‡qvm, Autoexec.bat, Config.sys BZ¨vw` dvBj¸‡jv †jvW nq|

How To Start A Computer?
Kw¤úDUvi Pvjy Kiv hvq wKfv‡e? cÖ_‡g Kw¤úDUv‡ii we`y¨r mieiv‡ni hveZxq jvBb wVK Av‡Q wKbv Zv †`‡L myBP Ab Ki‡Z n‡e| GLb Casing Box Gi Power Switch evU‡b wUc w`‡q Kw¤úDUvi ON Ki‡Z n‡e| wKQy¶Y A‡c¶v Kivi ci KZ¸‡jv Folder/Icon mn Windows Desktop Screen cÖ`wk©Z n‡e|

Introducing on Windows Screen:
DB‡ÛvR Gi ¯Œxb cwiwPwZt c~‡e©B ejv n‡q‡Q Kw¤úDUv‡ii Power On K‡i we`y¨r ms‡hvM mva‡bi ci hw` Kw¤úDUviwU Windows Operating System Gi gva¨‡g P‡j Z‡e Aí¶‡bi g‡a¨ Avcwb DB‡Ûv‡Ri Screen ‡`L‡Z cv‡eb| Z‡e Avcbv‡K Rvb‡Z n‡e DB‡ÛvR ¯Œx‡bi †ek wKQy ˆewkó¨ i‡q‡Q| hv †`L‡jB Avcbv‡K eyS‡Z n‡e Kw¤úDUv‡ii GwU Windows Operating System Gi ¯Œxb Ges KvR m¤úv`b Kivi Rb¨ mew`K †_‡K cÖ¯Z| ‘ DB‡Ûv ¯Œx‡bi GB ˆewkó¨ ¸wj wb‡gœ Zz‡j aiv njt My Computer t ¯Œx‡bi hveZxq AvBKb ¸‡jvi g‡a¨ My Computer GKwU| GwU w`‡q Kw¤úDUv‡ii nvW©wW‡¯‹i WªvBf ¸‡jv‡K cÖ‡ek Kiv mn dvBj, †cÖvMÖvg BZ¨vw` I‡cb Kiv hvq| My Documents t wWdvë †mwUs wn‡m‡e GB AvBKbwU ¯Œx‡bi My Computer Gi wb‡PB Ae¯’vb K‡i| Gi g‡a¨ Avgiv †h me Document RwbZ Kvh©vejx m¤úv`b Kwi Zv G‡m Rgv nq| Recycle Bin t ¯Œx‡bi Ab¨vb¨ AvBKb¸‡jvi mv‡_ Recycle Bin bv‡gI GKwU AvBKb _v‡K| Bnv Kw¤úDUv‡ii Wvóweb wn‡m‡e f~wgKv cvjb K‡i| Avgiv A‡bK mgq Avgv‡`i AcÖ‡qvRbxq dvBj ¸‡jv gy‡Q †dwj| Zv G‡m GLv‡b Rgv nq| Gici Recycle Bin Empty Kivi gva¨‡g dvBj ¸‡jv Kw¤úDUvi n‡Z wPiZ‡i gy‡Q w`‡Z nq| wimvB‡Kj web n‡Z GKevi gy‡Q †djv dvBj Avi KLbI †diZ Av‡m bv| Taskbar t Windows ¯Œx‡bi wb‡Pi w`‡K AbyfywgKfv‡e (Horizontally) we`¨gvb Ber wUi bvg Windows Task Bar. Bnv A‡b‡Ki Kv‡Q Avevi ÷vUvm evi wn‡m‡eI cwiwPZ| Gi mevi Wvb w`‡K _‡K U¨v¯‹ AvBKb| Kw¤úDUvi Pvjy nevi mg‡qB G¸‡jv †jvW nq| Gi mv‡_ Kw¤úDUv‡ii NwoI Ae¯’vb K‡i| Gi Øviv eZ©gvb mgq Rbv hvq| Start Button t Windows Taskbar Gi evg w`‡K Ò STARTÓ †jLv GKwU evUb cv‡eb| Gi Øviv Operating

System Gi †h‡Kvb Kvh© m¤úv`b Kiv hvq| Kw¤úDUv‡i Bb÷j Kiv ‡cÖvMÖvgI Gi Øviv Pvjy Kiv hvq| ÷vU© †gby‡Z †h‡q Avcwb †h Ackb †`L‡Z cv‡ib †m¸‡jv n‡”Q Shutdown, Run, Search/Find cÖf„wZ| Avi mve‡gby¸‡jvi g‡a¨ cv‡eb Programs, Documents, Settings cÖf„wZ| Z‡e DB‡ÛvR G·wc‡Z wKQyUv wfbœZv j¶¨ Kiv hvq|

Created by: Md. Kamrul Hassan Bappy

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E-mail: info@khola-janala.com

Computer Fundamental Using of Start Button:
÷vU© evU‡bi e¨envit Kw¤úDUv‡i Avcwb bigvj A_ev, mvBb&‡UwdK Dfq cÖKvi K¨vjKz‡jUi e¨envi Ki‡Z cvi‡eb| GRb¨ gvD‡mi mvnv‡h¨ wbgœwjwLZ KvRwU Ki“b| Opening Calculator: Start > Programs > Accessories > Calculator Avcwb Avcbvi wjLvi Kvh©vw` Kw¤úDUv‡i IqvW©c¨vW e¨envi K‡i m¤úv`b Ki‡Z cv‡ib| GRb¨ Avcwb wb‡Pi KvRwU Ki“b| Opening a word processing program: Start > Programs > Accessories > WordPad Kw¤úDUv‡i mvaviY Qwe AvuKv AuvwKi Kv†R Avcwb †cB›U ‡cÖvMÖvg e¨envi Ki‡Z cv‡ib| wb‡gœ †cB›U †cÖvMÖvg †Lvjvi c×wZ †`qv nj| Open Paint Program: Start > Programs > Accessories > Paint

How To Create A Folder? wKfv‡e ‡dvìvi ‰Zix Kiv hvq? DB‡Ûv‡Z gvD‡mi Right Button Øviv wK¬K Ki“b| New mve‡gby‡Z hvb| Folder G wK¬K Ki“b| ‡h‡Kvb GKwU bvg w`b| Kx †ev‡W©i Enter G Pvc w`b|

How To Delete A Folder? wKfv‡e ‡dvìvi ‡gvQv hvq?
Folder wm‡j± Ki“b| Press Delete Key [ Kx‡evW© †_‡K ] Yes G wK¬K Ki“b| Gevi †W¯‹U‡ci ¯Œxb n‡Z Recycle Bin Gi Dci gvD‡mi Right Button Øviv wK¬K Ki“b| †h g¨v‡mR e·wU Avm‡e Zv‡Z Yes evU‡b wK¬K Ki“b|

How To View File Or Folder? wKfv‡e dvBj ev †dvìvi Gi welqe¯‘ †`Lv hvq? Folder wm‡j± Ki“b| gvD‡mi Right Button Øviv wK¬K Ki“b| Properties G hvb| General U¨v‡e hvb| ‡`Lv †kl n‡j OK evU‡b wK¬K Ki“b|

How To Shut Down A Computer? wKfv‡e Kw¤úDUvi eÜ Kivi hvq? U¨v¯‹ev‡ii Start †Z wK¬K Ki“b| Shut Down G wK¬K Ki“b| GLb Shut Down AckbwU Choose Ki“b| OK ‡Z wK¬K Ki“b| AT Casing Gi †¶‡Î Ò It’s now save to turn off your computer Ó ¯ŒxbwU Avm‡j Kw¤úDUv‡ii cvIqvi myB‡P Pvc w`‡q Kw¤úDUvi eÜ K‡i w`b| Gevi ‰e`y¨wZK †gBb myBP Ad Ki“b| ATX Casing Gi †¶‡Î Ò It’s now save to turn off your computer Ó ¯ŒxbwU G‡m Kw¤úDUvi A‡Uv‡gwUK eÜ n‡q hv‡e| cvIqvi myB‡P Pvc w`‡q Kw¤úDUvi eÜ K‡i w`evi cÖ‡qvRb n‡e bv| Gevi mivmwi ‰e`y¨wZK †gBb myBP Ad Ki“b|

Created by: Md. Kamrul Hassan Bappy

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Computer Fundamental How To Restart A Computer? wKfv‡e Kw¤úDUvi cybivq Pvjy Kivi hvq? Av‡Mig‡Zv GeviI U¨v¯‹ev‡ii Start †Z wK¬K Ki“b| Shut Down G wK¬K Ki“b| GLb Restart AckbwU Choose Ki“b| OK ‡Z wK¬K Ki“b| ‡`Lv hv‡e cybivq eywUs cÖ‡mm Pvjy n‡q Kw¤úDUvi mPj n‡q‡Q|

mywcÖq cÖwk¶bv_©xe„›`, ï‡f”Qv iBj| D³ Av‡jvPbv †_‡K Avgiv Kw¤úDUv‡ii Gi m¤úwK©Z wewfbœ Z_¨ Ges DB‡ÛvR wKfv‡e cwiPvjbv Kiv hvq Zv m¤ú©‡K Rvbjvg| AvkvKwi Zv Avcbviv †R‡b‡Qb Ges e¨envi Ki‡Z †c‡i‡Qb| ïay Rvb‡jB Pj‡e bv| GB DB‡ÛvR e¨envi m¤ú‡K© my¯úó avibv _vK‡Z n‡e| hw` †Kvb Ask e¨envi Ki‡Z Amyweav nq Z‡e wk¶‡Ki mnvqZv wb‡q Gi mgvavb Ki“b| c~bivq mevB‡K A‡bK A‡bK ï‡f”Qv Rvwb‡q Kw¤úDUvi dvÛv‡g›Uvj c‡e©i mgvwß Kijvg| ï‡f”Qv‡š—,
MD. KAMRUL HASSAN BAPPY
(Diploma in Computer Science and Information Technology)

********************

Created by: Md. Kamrul Hassan Bappy

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...A proxy server is a computer that acts as an intermediary between the users computer and the Internet. It allows client computers to make indirect network connections to other network services. If use proxy server, client computers will first connect to the proxy server, requesting some resources like web pages, games, videos, mp3, e-books, any other resources which are available from various servers over Internet. As soon as getting such request, the proxy server will seek for the resources from the cache in its local hard disk. If the resources have been cached before, the proxy server will return them to the client computers. If not cached, it will connect to the relevant servers and request the resources on behalf of the client computers. Then it caches resources from the remote servers, and returns subsequent requests for the same content directly Functions of a proxy server * Help improve web performance by storing a copy of frequently used webpages * Help improve security by filtering out some web content and malicious software * Content filtering * Spying * To keep machines behind it anonymous (mainly for security). * To speed up access to resources (using caching). Web proxies are commonly used to cache web pages from a web server. * To apply access policy to network services or content, e.g. to block undesired sites. * To log / audit usage, i.e. to provide company employee Internet usage reporting. * To bypass security/ parental...

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...ages before, when there were no computers or any other technologies. So much we have advanced that now every information is just a click away and is in your hands 24/7. All this advancement was possible only with the introduction of a small device called the “Computer”. Computers Image Curtsey: csntrust.org.nz/attachments/Image/PC-picture-1.jpg?1367216528141 Basically, computer is a device that accepts the message by the imputer and processes this message and stores the information at the storage devices and later gives an output of the message through the output devices. A simple explanation of the computer. Normally, a computer consists of a processing unit called the Central Processing Unit or the CPU and a form of memory. In the years between 1940 and 1945 were the first electronic digital computers developed. The initial sizes were as big as a room and consumed power as much as today’s personal computers. Initially, computer was related to a person who carries out calculations or computations and as such the word computer was evolved in 1613 and continued till the end of 19th century. Later it as re-described as a machine that carries computations. The early computers were limited in their functions. It was the fusion of automatic calculation and programmability that produced the first computers that were recognized in 1837. Charles Babbage in 1837 was the first to introduce and design a fully programmed mechanical computer, his analytical engine. Due to limited...

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...Assembly Language Programming Lecture Notes Delivered by Belal Hashmi Compiled by Junaid Haroon Preface Assembly language programming develops a very basic and low level understanding of the computer. In higher level languages there is a distance between the computer and the programmer. This is because higher level languages are designed to be closer and friendlier to the programmer, thereby creating distance with the machine. This distance is covered by translators called compilers and interpreters. The aim of programming in assembly language is to bypass these intermediates and talk directly with the computer. There is a general impression that assembly language programming is a difficult chore and not everyone is capable enough to understand it. The reality is in contrast, as assembly language is a very simple subject. The wrong impression is created because it is very difficult to realize that the real computer can be so simple. Assembly language programming gives a freehand exposure to the computer and lets the programmer talk with it in its language. The only translator that remains between the programmer and the computer is there to symbolize the computer’s numeric world for the ease of remembering. To cover the practical aspects of assembly language programming, IBM PC based on Intel architecture will be used as an example. However this course will not be tied to a particular architecture as it is often done. In our view such an approach...

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...new releases and upgrades are made available from time to time. The database administrator will be aware of any new versions or upgrades to existing versions that could improve the efficiency of a currently installed database. In some circumstances database administrators are authorized to upload free upgrades and install them. In the event that a new version is available, the administrator will check with others in the company to determine if the cost of replacing the existing database software is worth the investment. Earnings for this job as of 2012 median of $77,080 per year and about $37.06 per hour, but the earnings can reach up to about $118,720; in the top 10 percent. Entry level education for this job is a bachelor’s degree in computer science, information science, or management information systems. The Bureau of Labor Statistics projects 15.1 percent growth of employment for database administrators;...

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...What is Computer : Computer is an electronic device that is designed to work with Information.The term computer is derived from the Latin term ‘computare’, this means to calculate.Computer can not do anything without a Program.it represents the decimal numbers through a string of binary digits. The Word 'Computer'usually refers to the Center Processor Unit plus Internal memory. Computer is an advanced electronic device that takes raw data as input from the user and processes these data under the control of set of instructions (called program) and gives the result (output) and saves output for the future use. It can process both numerical and non-numerical (arithmetic and logical) calculations.The basic components of a modern digital computer are: Input Device,Output Device,Central Processor. A Typical modern computer uses LSI Chips. Charles Babbage is called the "Grand Father" of the computer.The First mechanical computer designed by charles Babbage was called Analytical Engine. It uses read-only memory in the form of punch cards. Four Functions about computer are: accepts data | Input | processes data | Processing | produces output | Output | stores results | Storage | Input (Data): Input is the raw information entered into a computer from the input devices. It is the collection of letters, numbers, images etc. Process: Process is the operation of data as per given instruction. It is totally internal process of the computer system. Output: Output...

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...The History of Computers From primitive abaci to lab tops and calculators, the computer has evolved through time to become the essential part of our technocratic society. The development of the computer has shaped the way technology and science is viewed in different cultures around the world. The connotation of what a computer is nowadays brings to mind a monitor, keyboard, processor and its other electronic components; however, that is not how things have always been. From the Chinese using abaci to count, to the Druids' usage of stones to follow the seasonal changes, to the Europeans using Pascalines and calculators to work out mathematical problems the concept of the computer has been around for hundreds of years (Hoyle). Therefore, the history of computers is important to observe not only for the influence it brought to our culture, but the progress it has made through time. The history of modern computers has been influenced by the earlier advancement of primordial technology. The abacus developed in circa 500 B.C for example, used pebbles, rocks, beads, or shells to keep track of the counters numbers. Furthermore, "the abacus was man's first attempt at automating the counting process" (Hoyle). In addition, the Pascaline, invented and built by a French philosopher and mathematician Blaise Pascal, was the first mathematical adding machine (Long 54). The Pascaline was a gear-driven machine that allowed the user to calculate answers without doing arithmetic (Hoyle). In...

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...Computer A computer is a programmable machine that receives input, stores and manipulates data, and provides output in a useful format. A computer can process data, pictures, sound and graphics. They can solve highly complicated problems quickly and accurately. Block Diagram Input Unit: Computers need to receive data and instruction in order to solve any problem. Therefore we need to input the data and instructions into the computers. The input unit consists of one or more input devices. Keyboard is the one of the most commonly used input device. Other commonly used input devices are the mouse, floppy disk drive, magnetic tape, etc. All the input devices perform the following functions.  Accept the data and instructions from the outside world.  Convert it to a form that the computer can understand.  Supply the converted data to the computer system for further processing. Storage Unit: The storage unit of the computer holds data and instructions that are entered through the input unit, before they are processed. It preserves the intermediate and final results before these are sent to the output devices. It also saves the data for the later use. Memory Size: All digital computers use the binary system, i.e. 0’s and 1’s. Each character or a number is represented by an 8 bit code. The set of 8 bits is called a byte. A character occupies 1 byte space. A numeric occupies 2 byte space. Byte is the space occupied in the memory. The size of the primary storage...

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...COMPUTER HARDWARE AND COMPONENTS COMPUTER HARDWARE AND COMPONENTS Computer Basics     Equipment (Hardware) COMPUTER | A machine that processes information and performs computations. | Tower or Desktop | The "box" or case that holds the parts that make up a computer:  CPU, hard disk drive, floppy drive, memory chips, power supply, interface cards, etc. Click here to learn more. | |      CPU | Central Processing Unit, or "brains" of the computer | Monitor | An output display device (looks similar to a TV) in a computer system.  You see information on the monitor's screen. | |      Screen | The viewing area on a monitor or the information or image displayed. | | | | Disk Drive | A device that reads data from (input) or records data onto a disk for storage (output). |     Floppy  | Floppy Drive | . 3-1/2" Floppy Disk |     Hard Drive | The main device that a computer uses to store information. Most computers come with a hard drive, called drive C, located inside the computer case. |     CD-ROM | ROM means Read-Only-Memory - you can only "read" information, not save. A CD can store a large amount of data including documents,  photographs, software, and music (about 20 songs) | | CD Drive | Compact Disk | | CD-R A CD-Recordable drive can put data onto a disk in just one session, and then is "closed" - one "burn" only - you can't add to it after you create it.  | CD-RW A CD-ReWritable drive can be written onto more than once - similar...

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...(introduction) What is a Computer? B. History of computers C. (thesis) Types of computer 4.1 Supercomputer 4.2 Mainframe 4.3 Workstation 4.4 The Personal Computer or PC 4.5 Microcontroller 4.6 Server D. Hardware & software 5.7 hardware 5.8 software 5.9 firmware E. Basic operations 6.10 input 6.11 output 6.12 processing 6.13 storage F. Names for different sizes of data 7.14 Bit 7.15 Byte 7.16 kB 7.17 MB 7.18 GB 7.19 TB 7.20 PB G. Measurement of data speed 8.21 Mbps 8.22 Gbps H. Purpose of computer 9.23 performing calculations 9.24 storing data 9.25 retrieving data 9.26 processing data INTRODUCTION: WHAT COMPUTER IS? I. What is computer? A computer is a "box" that you put some "stuff" in, the box does "stuff" with it, and then the box has some way of showing the world what it's done. The stuff you put into a computer is called data, and gets into the computer using the input. Data is simply a form of information. You can put data into a computer by your keyboard, a mouse, a trackpad, a camera, an infrared sensor; anything that will give the computer more information about the world around it. Based on what information the computer has gotten, it can decide to do stuff with it. What the computer does with information is known as processing. A computer will process information...

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...Computers Today’s generation could never ever imagine in their wildest dreams about the world, ages before, when there were no computers or any other technologies. So much we have advanced that now every information is just a click away and is in your hands 24/7. All this advancement was possible only with the introduction of a small device called the “Computer”. Basically, computer is a device that accepts the message by the imputer and processes this message and stores the information at the storage devices and later gives an output of the message through the output devices. A simple explanation of the computer. Normally, a computer consists of a processing unit called the Central Processing Unit or the CPU and a form of memory. In the years between 1940 and 1945 were the first electronic digital computers developed. The initial sizes were as big as a room and consumed power as much as today’s personal computers. Initially, computer was related to a person who carries out calculations or computations and as such the word computer was evolved in 1613 and continued till the end of 19thcentury. Later it as re-described as a machine that carries computations. The early computers were limited in their functions. It was the fusion of automatic calculation and programmability that produced the first computers that were recognized in 1837. Charles Babbage in 1837 was the first to introduce and design a fully programmed mechanical computer, his analytical engine. Due to limited finances...

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...The computer is the most wonderful gift of science to the modern man. The computer can do all the works of man. Thus, after the invention of computer, the gap between man and machine has been bridged up. The dictionary meaning of the word "Computer" is an electronic calculating machine. It is derived from the word compute which means to reckon. But the function of the computer has expanded beyond the act of reckoning. Though a machine, it contains and provides innumerable information's and artificial intelligence of a very high order. It may seem strange, but it is true that the memory and intelligence of a computer can surpass those of a living human being. The mechanism of the computer is very simple. Information processing is the essence of computing. It is a data based machine. The data is fed into the machine. The machine is manipulated and then the due information is retrieved. Computer was invented due to the pressures of World War-II which witnessed the use of such sophisticated weapons as night bombers, submarines, and long range guns on ships and tanks, etc. The defenders have to fight back by shooting at targets and those targets of the enemy can be located by radar. Radar can inform not only about the location of the enemy but also about the direction and the speed of the enemy weapons. Detailed mathematical calculations are necessary to find out these things accurately. Firing tables are required by the front line soldiers. Thus the necessity of calculations...

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