Computer Science

About Computers

2011-06-23T05:47:00.000-07:00

About Computers Knowledge Base

The computer is a machine that is often used in human work lately. Along with the human needs that need efisiensitas in effectiveness in the work. In the computer implementation is very media that is in need. and of course we have to know some additional hardware components in komputer.Diantaranya are: 1.Mainboard 2.Processor 3.Ram/Memory 4.Harddrive 5.DVD/CD Drive 6.Casing 7.Sound Card 8.VGA Card 9.Lan Card 10. Key Board & Mouse 11.Printer 12.Speaker
1.Mainboard/Motherboard

is the hardware (hardware) that has a function as a distributor and the regulator between the processor with other devices, such as Ram / memory, Lan Card, VGA Card, Sound Card, Speaker, USB or Flash Disk, Hard Drive and Printers.
At first mainboard consists of several slots. however, along with the mainboard in its development efficiency by bringing together for the VGA cards, sound cards, and Lan Card together with the mainboard is commonly known by the name mainboard onboard. however, there are still places available slots to be used. to set the bios on the mainboard. then, the user can set the hardware interface you want to use.
2.Processor

A device that can perform a number of process flow can then be send to some hardware that has grooves that process.

At first processor using type vacuum tube. berburntuk like a vacuum machine and engine box.

Provider processor also now more advanced and rapidly. almost every year, the latest processor out on the market. beginning of the computer I get to pentuim Pentium IV. not only the intel corp that continuously improve the quality of the processor, AMD corp was keen to improve its quality. Here are the products based on chipsets and typenya interl: 1. Intel Pentium I 2.Intel Pentium II 3.Intel Pentium III 4.Intel Pentium IV 5.Intel Pentium Core Duo 6.Intel Pentium Core 2 Duo 7.Intel Pentium Core 2 Duo Squad 8.Intel Pentium Core 2 Duo Extreme 9.Intel Pentuim I3 10.Intel Pentium I4 11.Intel Pentium I5 12. Intel Pentium I6 13.Intel Pentium I7

Processor is generally box-shaped. and there is a chip of copper precious slots, as a liaison between the processor with the motherboard. Processor is the core of the computer brain. meaning as the central unit.

3. Ram / Memory

As if it aids in the command processor. and as a reminder of the execution process will be undertaken by the processor. Memory development also follows the mainboard. because the slot mainboard must be in accordance with the Ram to be installed. because if any, there will be dumping. The following are the kinds of Ram on typenya. a. Type ====> Ram SDRAM Motherboard support Intel Pentium I, II, III b. DDR Ram Type I ======> motherboard supports Intel Pentium IV c. DDR Ram Type II ======> LGA Motherboard support Intel Pentium, Core Duo, Core 2 Duo and so on. d.Type Ram DDR III ======> I3 intel motherboard support and so on.

4. Hard Drive

As Media Storage Operaating system, data, files and others. hard drives generally follow the development of the processor, mainboard and software. when pentium 1, the beginning of the Hard Drive in introduced, has a capacity of only 4 GB. because there are no operating system. and only use under dos. such as the display mode mainboar bios.

Hard Disk Storage Meida is being developed by several companies. such as Samsung, Maxtor and others. Hard disk storage pu now have two types: 1. Type ATA hard disk 2. Type Sata Hard DiSK.

5.CD or DVD Drive

    Is a tool to transfer data without a network cable uses the same but using a CD or DVD. This device is an outgrowth of drive.CD floppy or DVD drive in the slot pair in the existing data on the mainboard. and CD and DVD based system works divided into two:
A.DVD / CD Room
B.DVD / CD RW

A.DVD / CD Room
    This device can only read data from a CD or DVD.
B.DVD / CD RW
    These devices can read and transfer the data into a CD or DVD.

Visual Basic

2011-06-22T08:12:00.000-07:00

About Visual Basic 6.0

Visual Basic 6.0

I. Definition

     Visual Basic 6.0 is one application to create a database information system. Visual Basic 6.0 This is a continuation of the visual basic 1 to 5. although a bit behind, but this software application is used to pengimplementaisannya in the manufacture of a database system. Visual Basic 6.0 was also developed into a visual studio, visual basic 2008 to visual basic. net.

    Visual Basic 6.0 is often also used in the calculation of salaries, sales and other goods. It supports visual basic windows operating system. and to be able to use Microsoft Access database, SQL Server and Oracle.

  In the menu there are visual basic components of course the need to determine the coding or syntax to be used. because one point or comma in a visual basic program will result in system debug or error.

      Here is a little introduction about visual basic 6.0

The above is a sample Visual Basic 6.0 application program, the user typically begins with the project. and Form1.

A. Project B. Sub Form / MDI Form C. Form D. Coding / sytax E. Report F. Module
A. Project

Project is a file name that will be known in the calling application program. we can change it according to the name of the file or database system that we want. This project also specify the directory in the application form that will be created. because, the entire project is created, it was represented on behalf of the project. when we memembuat data application, the project is so representative of the entire application that you created in visual basic. Here is a picture / icon project when stored on your computer:

B. Sub Form / MDI Form

MDI form is the main form in microsoft visual basic. because the MDI form it represents forms that exist in the database application that we make. in MDI form there is usually only coding calling other forms. we can not make the database system tables in it. because the MDI form is designed / is designed to control other forms. The following are examples of MDI form:

C. Form

Application Form is made for the implementation of systems that can perform some appropriate command execution in want. in this form we can mengkodingkan application to call a database, display data, deleting data, updating data, edit data and print data that has been our execution. Here below is a sample form images that have been designed as needed:

D. Or Coding Syntax

Are the commands in visual basic application programming language that has been ditentukan.dalam coding is also affecting the system can walk or not. in the manufacture of coding must be careful, because if one point or comma, will result in application programs that we make have debug or error. The following is an example of image coding for the form above. :

E. Report

In Design Report also affect the results we have the execution output. in making the report must be careful, because if it is wrong, then the report will be in print would not be as expected. The following is a sample report in visual basic:

F. Module

Module is a command to connect your between pogram visual basic with a database that will be used in applying the program. This is a picture berikuit module:

Note:

Example Problem:

1. Create a login program application form. by using Visual Basic 6.0 and MS database. Access:

Answer:

Make a design for a login form as shown below:

after creating the form please enter code in the form as follows:

Private Sub cmdCancel_Click()
Unload Me
End Sub

Private Sub cmdOK_Click()
If Combo1 = rsad!pengguna And txtPassword = rsad!sandi Then
FORMUTAMA.Show
Else
MsgBox "Unknown user", vbExclamation, "DATA ERROR..!!"
Unload Me
End If
End Sub

Private Sub tampil()
Combo1 = rsad!pengguna
End Sub

Private Sub Form_Load()
bukadata
tampil
End Sub

then make a Microsoft Access database with the following format:

then add modules as shown below, and fill in the coding as follows:

Global cn As Connection

Global Rsuser As Recordset
Global Rscpu As Recordset
Global Rsprinter As Recordset
Global Rsservicecpu As Recordset
Global rsservicep As Recordset
Global rsad As Recordset
Global Vcari As String

Sub bukadata()
Set cn = New ADODB.Connection
Set Rsuser = New ADODB.Recordset
Set Rscpu = New ADODB.Recordset
Set Rsprinter = New ADODB.Recordset
Set Rsservicecpu = New ADODB.Recordset
Set rsservicep = New ADODB.Recordset
Set rsad = New ADODB.Recordset

Luthfi = App.Path + "/itinventory.mdb"
cn.Open "provider=MSDASQL.1;Persist Security Info=False;Data Source=it"
Rsuser.Open "select*from pengguna", cn, 1, 2
Rscpu.Open "select*from cpuid", cn, 1, 2
Rsprinter.Open "select*from printer", cn, 1, 2
Rsservicecpu.Open "select*from servicecpu", cn, 1, 2

End Sub

Good luck

Main

2011-06-22T08:11:00.000-07:00

Computer Science

Computer Hardware Basic
LAN
Visual Basic
Corel Draw
Photo Shop
PHP
ASP
Movie Maker
How To Recovery Bios password

Written By Luthfi S.Kom
Banten - Indonesia
+62 0254 232 425
+62 085920012164

LAN

2011-06-22T07:53:00.000-07:00

LAN (Local Area Network)

LAN (Local Area Network)

Lan or Local Area Network is usually used for a network connection between the computer 1 to several computers or from multiple computers to multiple computers. usefulness is in addition to the connection could be to transfer data from one computer to another computer.

     Usually in pengkoneksian lan using Belden cable or coaxial. interface that serves as a connection medium. in general most people use Belden cable with a connector that is commonly known by the term UTP. UTP cable is very very easy in setnya and easier to use.

     Some network interfaces that exist within the network topology. why Lan require network topology? it is meant to map the location or place the computer 1 with the others, the following flow network cable. for easy maintenance / repair track.

    Generally there are 3 kinds of topology are commonly used: 1.Cross 2.Star 3.Mesh 4.Bus 5.Ring 1.Cross

    That is a network system that uses the server as a regulator of its network. so that data security can be maintained. because all users of its network has been set by the admin (user server computer users.) so that other users can only use the network according to their needs. The following below is an example of cross topology:

deficiencies in the system topology is a cross cable when the server is dead, then other users can not access the network. so that the use of cross topology usually have the admin user. that is representative of the administrator in the network settings if the computer administrators have a problem. This cross topology can also use the hub if the long route users to the server more than 100 meters. because the connection strength is only 100 meters UTP cable.

2. Star

Star topology is generally a simple lan network. due to the interface connector is only centered on the hub. Existing hub in star topology is usually only serves as a connector interface of a network into multiple networks without requiring a server computer as a regulator. weaknesses in the security system is a weak star. in the absence of the administrator as a regulator of tissue.

3.Mesh

In the mesh topology, usually called the "pure peer to peer". because the only link between computers without using a hub. and this topology is rarely used. due to the complex and also very weak securities owned.

4. Bus

Bus network topology is the connection interface has only 1 network as a connection. without incorporating the other connections. This bus topology is usually used to transit data with backbone.

5. Ring

Ring is the topology resembles a network that forms a ring. as well as star topology and bus topology. ring topology does not have an administrator as a regulator of its network. only PC to PC connection is not regular. so that the securities in the ring topology is very weak.

Written By Luthfi S.Kom
Banten - Indonesia
+62 0254 232 425
+62 085920012164

How To Remove Bios Password System

2011-06-22T07:34:00.000-07:00

Bios is a computer system which comes from the usual hardware known as the mainboard. in the system bios setup operations are necessary for system optimization in the mainboard. in the bios there is a system program that can also set passwords for the security of the computer system itself. but sometimes there are some people who forgot the password on him. The following authors explain the steps to overcome the existing bios password is forgotten.

1. Open your CPU casing

2. Take Cmos that is in the mainboard

3. Turn on the computer without Cmos

4. Turn off your computer again

5. Put back the earlier you take Cmos

6. Close your CPU casing

7. Turn on the computer and press DEL on the keyboard.

8. You can enter a computer without a password, so you can give your password to the system bios.

Good luck

Written By Luthfi S.Kom
Banten - Indonesia
+62 0254 232 425
+62 085920012164