COMPUTER PARTS

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assembly computers

www.youtube.com/watch?v=zOfS2NOWc0U

history of computer

http://en.wikipedia.org/wiki/History_of_computer

FORMAT AS A COMPUTER

STEPS TO THE ASSEMBLY AND DISASSEMBLY OF A DESKTOP PC

STEPS TO THE ASSEMBLY AND DISASSEMBLY OF A DESKTOP PC

1) Prepare the workplace it is, well lit, at a suitable height, screwdrivers (striae), a small box for events screws, clean, dry hands, next to the guide for mounting the computer. You can also NEED pliers to remove the coils covers the front of your computer and change some bridge.

2) Connections and settings for the motherboard: this is removed and can be placed on a surface. you look at the manual and start to configure the first jumpers if any mo mount the micro, the most fan dicipador and memory as no longer have access to another during assembly.

3) Put the power in their structure

4) Set the plate: to fix the plate to its structure taking into account system or security use poles, place the necessary screws that are 4 or 5 so that the plate is motionless.

5) Assemble the processor: insert the micro plate. if they are a pentium/MMX/K5/K6/K6-2/6X68/MII/WINCHIP and others of this style, used the ZIF (zero insertion force). is inserted at socal.

 6) Mount the memories: there are 3 types:

-SDR-RAM DIMM 168-pin DDR-RAM or 184-pin

DIMM, RAMBUS, we find in some places pentium IV, physically very similar to the above.

SIMM MEMORY MODULES have 2 connection possibilities: 1-for vertical insertion. 2-for diagonal insertion.

7) expancion cards: before inserting them, we must etire plate is in front of the slot where we will insert them. not all slots have the same size. in the AGP slot or PCI graphic card rage in the ICP can also go 3D accelerator card to the SCSI controller and the ISA can go to the modem and sound card.

To insert the card first trente place it in the slot. located once begins to press, but try not to do too much.

 8) Storage Units: to mount the CD-ROM or DVD recording of the holes look a 5.25 "We will make match the screw holes on each side and screw it. Just to do with the drive, but this goes in the 3.5 ". hard disk must be put in a hole the size of the drive, with the exception that the gap must be blind, ie that is not accessible from the front of the box.

9) power cables, are connected in 2 ways, depending on whether the plate and the box is baby AT or ATX. If there will be 2 BABY AT power connectors. these connectors are black wires, which would have to be those of a connector with the other. when inserted into the connector of the motherboard has only one position. If there will be a single ATX connector with a range that is hooked to the connector socket to allow latched

10) LED Connections: The speaker and the power button is usually a series of pins located at the bottom right of the box. (See the manual). cables LEDs (POWER IDE) and speaker (SPEAKER) usually have a black colored wire and a white wire. the colored wire is the most and white the least. colored wires always looking to one side and white on the other. the colored wire faces the PIN1 of these pins.

Power button just plug into the motherboard ATX if this is because if a cable BABY AT proviniente will come out of the power supply.

11) close the box or cabinet, connect the devices.

WHAT IS A DATA BASE:

WHAT IS A DATA BASE:
One of the databases is a "warehouse" that allows us to store information in an organized way that we can then easily find and use.
Databases The term was first heard in 1963 at a symposium in California, USA. A database can be defined as a set of related information that is grouped or structured.
At present, due to technological development in fields such as computer and electronics, most databases are in digital format (e), which offers a wide range of solutions to the problem of storing data.
FEATURES B.D
 Allows to view only the records of the database when the user entered a number of records in it.

 Sets the editing rights. You can add entries teachers and students, if allowed in the database. This

does not restrict the display of your tickets for all.

You can limit the maximum number of tickets for each participant.

 We let you add comments to the entries in the database.

Concurrent access by multiple users.

 Access security and audit.
 Data Independence. This means that the data does not depend on the program and therefore any application can make use of the data.
 Redundancy Reduction. We call the existence of redundant duplication of data, reducing it to get a higher maximum use of space and also prevents any inconsistencies exist between the data. Inconsistencies occur when we find conflicting data.
 Security. A SBD should allow us to have a control over the security of the data.
 Usually displayed as a table in a spreadsheet, in which the records are the rows and columns are fields, or as a form.
 Let’s make a list of the database.
 Programming to allow advanced users.

USES OF DATA ARE MULTIPLE BAES AS:
• Make list of data for certain companies or offices as needed.
• Allows different users consider the information as a corporate resource that has no specific owners.
• Data Independence. The data independence implies a separation between programs and data, ie you can make changes to the information contained in the database or access database in different ways, without making changes to applications or programs .
• Elimination of redundant information. Duplicate
• Elimination of inconsistent information. If the system is developed through conventional files, such cancellation shall be operated in both bills file Collection Control System as the file system Commissions bills.
• Allows sharing of information. Several systems or users can use the same entity.
• Maintains the integrity of the information. Only the right information is stored.

BASE MANAGEMENT SYSTEM (DBMS)
Management Systems Databases, are applications that allow users to: Define, create and maintain the database and provides controlled access to it.
The DBMS is the software that interacts with users of the application programs and database.
Some of the most popular DBMS are: SQL, DB2, SLQ / DS, Oracle, Ingres, Informix, Sybase, Paradox, dBase, Access, FoxPro, R, RM / T and RM/V2.
OBJECTIVES OF A DBMS
 Define the database using the Data Definition Language, which allows the structure, data type and restrictions on the data, storing it all in the database.
 Separate the description and manipulation of data, allowing a greater understanding of the objects, and flexibility of querying and updating data.
 Allow insert, delete, update, query the data using the Data Management Language, which allows to solve the problem presented by the file systems where you have to work with a fixed set of questions or the need for many programs of applications.There are two types of Data Management programs, which differ in the way they access data.
 Procedural languages: manipulate the database record by record and must specify the operations to be performed to obtain the data results.
 No procedural languages: manipulate database recordsets and specifies which data should be obtained as a result without asking the way to go. The language used is no more procedural SQL (Structure Query Language) that has become a standard and the default language of relational DBMS.
 Provide controlled access to the database.
 Security: unauthorized users can not access the database.
 Integrity: maintaining the integrity and consistency of the database.
 Recurrence Control: allows shared access to the database.
 Control of Recovery: restore the database after a failure of software or hardware.
 Data dictionary or catalog: contains the description of the data from the database and is accessible by the user.
 Manage the physical structure of data and storage, providing operational efficiency of the database and access to the storage medium.
 Provide a view mechanism that allows each user to have his own view or vision of the database. The language definition allows us to define views as subsets of the database, allowing:
 Provide a safe level excluding data from being viewed by certain users.
 Allow users to view data in the desired format.
 A view represents a consistent and permanent database, even when the database is to make changes in its structure.
 Eliminate data redundancy, provide minimal data duplication and minimize disk space used.
Provide procedural and procedural interfaces, allowing manipulation by interactive users and programmers.
 Independence between the structure of the logical organization of data (physical independence).
 Independence between the logical description of the database and specific descriptions of the different points of view of users.
 Allow for easy data management.

Entity-Relationship Model
It is a tool for modeling data from an information system. These models express the relevant entities for an information system and their interrelationships and properties.

 

1. It produces the diagram (or diagrams), Entity-relationship.
2. Model is completed with lists of attributes and a description of other restrictions that may not be reflected in the diagram.
Given the rudimentary nature of this technique requires some training and experience to achieve good data models.
Data modeling is not just using this technique. Other techniques are needed to achieve an implementable model directly into a database. Briefly:
§ Processing of multiple binary relationships.
§ Standardization of database relationships (some relationships can become attributes and vice versa).
§ Conversion tables (in case of using a relational database).

Relational Database
Is a database that conforms to the relational model, which is themodel currently used to implement database already planned.Allow to establish interconnections (relationships) between the data (which are stored in tables), and through those connectionsrelate the data from both tables, hence its name: "Relational Model".
Features
§ A relational database consists of multiple tables or relations.
§ There can be two tables with the same name and registration.
§ Each table is itself a set of records (rows and columns).
§ The relationship between a parent and a child table is carriedout through primary and foreign keys (or foreign).
§ Primary keys are the primary key of a record within a table andthey must meet the data integrity.
§ Foreign keys are placed in the child table contain the same value as the primary key of the parent record, by means of theserelations are made.

SAFETY EQUIPMEN

• Have a fire extinguisher: in a work area should always keep a fire extinguisherhandy because whenever working with electrical equipment and electrical fires are not exempted.

• A suitable area of work: we must always have a large, clean and well lit.

• An emergency exit: should always be an emergency exit in case of fire exit.

• A first aid kit: This is a must because it is the main thing in an emergency.

2. SAFETY STANDARDS FOR USERS, WARNINGS AND PRECAUTIONS TO BETAKEN INTO ACCOUNT FOR performing maintenance on computer equipment.

• Have the appropriate attire
• Take anti-static handle
• The necessary tool
• A workbench
• A well-lit
• Do not eat on the team
• To have him proper management
• An excellent hygiene
• Disconnect power from any source
• Care and Precautions for safety in our homes we have in mind:
1. Know the hazards and characteristics of each product you purchase.
2. Really evaluate the need to purchase the products.
3. Do not mix products, follow the manufacturer's instructions.
4. Keep cleaning products, pesticides, and drugs away from children
And animals.
5. Avoid using very aggressive, highly polluting or not
Have information.
6. Separate flammable products away from heat.
7. Separate pesticides, especially of food.
8. Separate the acidic products containing ammonia or
Caustic soda or potash as.
9. Only use cleaning products in well ventilated and use air
Elements of protection.
10. Wash hands and face before eating or drink anything for
Avoid ingestion of chemicals.
11. Use only the necessary amounts, not to waste water nor
Products.
12. Leave the containers tightly capped after use.

3. CHEMICALS USED IN SUPPORT TEAMS: CHARACTERISTICS, USES AND APPLICATIONS.
Isopropyl Alcohol Foam: It is mainly used to remove fat and circuit boards
Clean equipment heads and video tape players.
Electronic cleaner: Cleaning of electrical contacts and electronic equipment
Navigation.
Easily removes dust, lint, light oil and grime.
Contact cleaner: Cleaner precision electrical and electronic contacts.
Avoid contact failures, improving the functioning of
Team
Compressed air dust remover: remover powder with great force and precision.
Ultra-filtered dry gas harder than others, ideal for use
On almost any surface, it is not abrasive.

Perfect choice for keyboards foam: With the perfect foam could clean any surface
Plastic very easily, providing greater durability
And look at their computing equipment.
Cleansing Gel anti unmarked striped screens: This specially formulated to leave no residue on your screen.
Precautions:
Do not apply directly on the screen.
Neat air express: express air Prolicom gas is a cleaner high-quality packaging
Pressure. Its use eliminates dust and debris buildup
The electronic components. Air - Express can be used in computer
Computing, telephone, control, medical and scientific purposes.
Plasma clean: to clean LCD and PLASMA 100% natural.
The cleaner features plasma and LCD screens boat
120ml special cleaner for plasma.

Foam monitors: computer cleaning foam pair
pcdominio.com foaming cleanser 454ml gr pcdominio plastics.

Pcd cleansing lotion: 250ml is for general cleaning of plastic components
Plastic Computer cleanser, ideal for use in the
Plastic PC, such as keyboard, mouse, monitor, speakers, etc..
Anti static wipes, to clean the practical 30-piece PC
Boat with 30 wipes ideal for cleaning the PC monitor
Since no residue. It can also be used to clean the
Keyboard, mouse and plastic items.
Preserve cleaner / degreaser: fix problems quickly
Cleaning more difficult. Particularly suitable for cleaning
Components and equipment.
Varzol: This pure product is applied to clean frames, spatulas
And tools can generally be used to remove ink residues
The hands, clothes, to mix with soap karpol for better
Degreasing

CLOROX: a chemical composition of caustic soda, sodium hypochlorite, sodium chloride, water, fragrance.

4. USE OF CLEANING EQUIPMENT
Blower: used for cleaning equipment since the equipment or boot with great force air dusting of objects.
Brush: This product is used to remove dust from the components

Draft cream: this is used to remove corrosion from contacts in the equipment.

Cleaner-mail: This chemical is used to clean electrical contacts on the components.

Foam Cleaner Keyboard: As the name says it serves to clean the keyboard.

Liquid to clean screens: it is liquid you used to clean the screens.

Frotex Cream: it is to clean the chassis.

Degreaser Cleaner E-Cards: This product is used for degreasing electrical contacts.

5. EFFECTS OF EROSION AND ACCUMULATION OF SOLID WASTE ELECTRICAL CONTACT SURFACES.

After long periods, the excessive level of moisture cause corrosion on metal surfaces. It is very rare to find contacts corroded wires in the computers, as this usually happens only in places where there are lots of moisture.
Corrosion error causes symptoms that are very difficult to diagnose. Usually these symptoms will be intermittent (sometimes the computer will work and sometimes not).
Occasionally, check the cable connections of the system to check for any corrosion.
Corrosion is a factor that affects all materials, not only metals and causing great loss of money and sometimes lives, and that corrosion can consume so much material to lose its physical properties which can force change in one or more parties in a given structure or in extreme cases the collapse of this. To avoid this, various techniques have been developed to prevent corrosion, or prevent it, but as there different types of corrosion, must also be different types of techniques to avoid it.