HP Brio 8500 Скачать руководство пользователя страница 22

Страница: 22 / 82

2 About Your BIOS

The BIOS in Your Computer

WhatIs the BIOS?

The

BIOS

has two main roles:

•

It tests and configures the computer’s hardware components during the

POST

, and lets you perform further

configuration by using the

Setup

program.

•

It provides the link between the software running on your computer, which has been written to be independent of any
particular computer, and your computer’s hardware (the hard disk, the keyboard, the display, and so on).

The BIOS is part of the System

ROM

and is stored in a chip on the system board. A computer’s BIOS is specific to that

computer.

WhatCanIDowiththe

BIOS?

You can configure certain aspects of your computer by using the

Setup

program which is part of the BIOS. Refer to

“The

HP Setup Program” on page 23

for more information about the

Setup

program.

Содержание Brio 8500

Страница 1: ...Online Reference Guide Online Guide Date Spring1998 HP PC ...

Страница 2: ...e toolbar to go to the next page in the guide Click the Previous Page button in the toolbar to go to the previous page in the guide Click the First Page button in the toolbar to go to the opening screen of the guide Click a bookmark name to the left of the screen to go to the topic corresponding to that bookmark Click the small triangle to the left of the bookmark to hide or show more bookmarks ab...

Страница 3: ... in connection with the furnishing performance or use of this material This document contains proprietary information that is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of Hewlett Packard Company Microsoft MS DOS and Windows are U S registered trademarks of Microsoft Corpo...

Страница 4: ... set of programs that control the input and output of data to peripherals Upgrading and Adding Accessories information about how to install new hardware components such as main memory or expansion cards Purpose of This Guide The purpose of this guide is to provide you with technical information about your computer This is information that you will not need to reference every day but which you will...

Страница 5: ...ut 10 Main Components and Features of the System Board 11 System Board Configuration Jumpers 12 Your Sound Card 13 Connecting Audio Devices to the Rear Panel 14 Connecting Audio Devices to the Internal Connectors 15 Power Consumption 16 Typical Power Consumption Availability 16 Your HP Enhanced Keyboard 17 Using the Enhanced Keys 18 Configuring Keyboard Shortcut Keys 19 ...

Страница 6: ...puter 26 Restricting Access to Your Computer Setting a Password 26 Power Management in the BIOS 27 Checking Your Configuration 28 Warning Messages and the Power On Self Test 29 Beep Codes 29 How to Recover if Things Go Wrong 30 System Boot Failure 30 Ventilator Fan Failure 31 Incorrect Password on Startup 31 Clearing the CMOS Configuration 31 3 Upgrading and Adding Accessories Why Upgrade 34 ...

Страница 7: ...ing and Replacing the Cover 37 Upgrading Main Memory 40 Upgrading a Processor 43 Adding Accessories 48 Adding Expansion Cards 48 Installing an Expansion Card 49 Installing Storage Devices 53 Changing the Battery 61 4 AT Commands Basic AT Commands 64 Modem Response Messages 68 Glossary 73 Index 77 ...

Страница 8: ...8 ...

Страница 9: ...1 About Your Hardware ...

Страница 10: ...ondary IDE Connector Primary IDE Connector Floppy Disk Drive Connector 1 ISA Expansion Card Slot COMBO Slot PCI or ISA 3 PCI Expansion Card Slots Main Memory Module and Sockets Clear CMOS refer to page 31 Processor and Socket Video Controller Processor Frequency Selection Jumper Strip refer to page 46 Battery Fan Chassis Connector Power Supply Fan Rear Panel Connectors Power Supply Connector Proce...

Страница 11: ...E channel used for example for IDE CD ROM drives IDE hard disk drives or IDE Zip drives Floppy Disk Drive controller supporting two devices Rear panel connectors 1 mouse socket 1 keyboard socket 1 display connector 2 Universal Serial Bus USB connectors 1 parallel port 1 serial port The main memory controller supports three DIMM slots Each slot can host a 168 pin unbuffered 3 3V DIMM module for a t...

Страница 12: ...default setting Refer to Clearing the CMOS Configuration on page 31 for information about clearing the CMOS and using this jumper Microprocessor Configuration Jumper BF This jumper allows the system board to match the speed of the installed processor You only need to change the microprocessor configuration jumper if you install a new processor with a different speed to the one that is currently in...

Страница 13: ...note below Telephone Answering Device Connector refer to note below Multimedia Control Panel Microphone Connector refer to note below Jumpers are required between pins 3 and 4 and between pins 5 and 6 of the Multimedia Control Panel Connector Without these jumpers the sound card will not output sound through the rear panel These jumper connections are set by default Line In Microphone Line Out Spe...

Страница 14: ...ted headphone jack for this purpose SPEAKERS Connect speakers for audio output from the card s built in power amplifier Adjust the volume from within the software or from the multimedia control panel if this feature is on your computer MIDI GAME Connect a joystick for game software or MIDI instrument The MIDI port is disabled by default You will have to enable this port if you wish to use it with ...

Страница 15: ...tuner or other similar card It can also be used to accept decompressed audio data from an MPEG video card The AUX In connector has the following pin assignments CDAudioConnector The CD Audio Connector labeled CDAUDIO allows you to connect the sound card to the CD ROM drive via the audio cable so that you can listen to audio from the CD ROM drive The CD Audio Connector has the following pin assignm...

Страница 16: ...memory even when turned off Note When the computer is turned off with the power button on the front panel the power consumption falls below three watts but it is not zero The special on off method used by this computer considerably extends the lifetime of the power supply To reach zero power consumption in off mode either unplug the computer from the power outlet or use a power block with a switch...

Страница 17: ...us software applications You can also create your own shortcuts to your most frequent tasks by configuring certain keys For example you can access your word processor application at a touch of a single key Messages key with mail LED HP Brio Center WEB browser Menu key Suspend key Mute Volume control Information Display the Windows Start menu by pressing either of the two Windows keys Access the ri...

Страница 18: ...n the power saving capabilities if configured in the Control Panel or start the screen saver It is recommended that you configure your screen saver with a password to lock the computer when the screen saver is activated A screen saver will not be cleared until the correct password has been typed No Information Accesses the information section of the HP Brio Center No Mute and Volume Control Press ...

Страница 19: ...ab from the Keyboard Properties screen To define a Shortcut key you need to Click here to restore the default settings for the shortcut key Use the Browse button to locate the file you want to use in the Command field Click here to activate the Question Mark pointer Then click any element to obtain information Provide a Command which is the executable that starts the application Provide a Descript...

Страница 20: ...ed in your Internet settings Click this button to restore the default settings for the shortcut key Reduce the power used by the computer by putting it in suspend mode This option is activated by pressing the Suspend key Click here to activate the Question Mark pointer Then click any element to obtain information 1 The Turn Power Management on and Turn screen saver on options can both be enabled a...

Страница 21: ...2 About Your BIOS ...

Страница 22: ...unning on your computer which has been written to be independent of any particular computer and your computer s hardware the hard disk the keyboard the display and so on The BIOS is part of the System ROM and is stored in a chip on the system board A computer s BIOS is specific to that computer WhatCanIDowiththe BIOS You can configure certain aspects of your computer by using the Setup program whi...

Страница 23: ...mputer For information on how to set a password refer to Restricting Access to Your Computer Setting a Password on page 26 Power for selecting power management modes to reduce the amount of energy used after specified periods of inactivity Refer to Power Management in the BIOS on page 27 Boot for choosing your boot device order and priority Refer to Boot Device Priority on page 25 Exit for leaving...

Страница 24: ...with a solid right arrow The key or keys allow you to exit from a sub menu The and arrows select menus from the menu bar The key loads factory installed default values The key saves and exits from the Setup program The key or keys display the general help screen The key exits from the general help screen Pressing the or arrows while you are on a main menu screen will take you to the next menu opti...

Страница 25: ...tions To select the boot device use the and arrows then press the key to move the device up the list or the key to move it down the list Changing the Boot Device Priority for the current boot You can also change the boot order just for the current boot To do this press while the logo and the message Press F2 to enter SETUP are displayed during system startup This initially displays the POST before...

Страница 26: ...uter being started or used in your absence The password is entered when the POST has completed before the computer finishes its normal startup procedure Password on boot can only be enabled if the Password has already been set It should be noted that this password option is not linked with your Windows operating system To enable a Password on Boot 1 Start the Setup Program 2 Select the Security me...

Страница 27: ...e the power management settings though the HP Setup program use the or keys to move along the main menu bar to the Power Menu The item is then highlighted and displays the available power management options You will be able to set the delay before the system can automatically enter Suspend Mode and also specify the events which make the computer wake up In most cases default settings should be app...

Страница 28: ...ter s logo displaying the system components and devices Press the Pause Break key to freeze the screen When you have finished reading the POST screen press any key to continue At the end of the POST screen the Boot Menu will be displayed You can either choose to exit the menu by pressing the key or enter the Boot Menu to modify the device for the current boot How to modify the current boot device ...

Страница 29: ...l for identifying the error when the system is unable to display the error messages The following table is a list of beep codes issued for terminal errors B4h This does not indicate an error There is one short beep before system startup 16h BIOS ROM checksum failure 20h DRAM refresh test failure 22h 8742 Keyboard controller test failure 2Ch RAM failure on address line 2Eh RAM failure on data bits ...

Страница 30: ... start up restart the computer enter the Setup program then press the key This will load the Setup default values to recover However by doing this you will lose all customized settings in the Setup program These settings will have to be reconfigured If you are having problems with POST error messages you probably need to clear the current configuration memory values and reset the built in default ...

Страница 31: ...nt or reseller for help Incorrect Password on Startup After three unsuccessful attempts to enter the correct password on Password on Boot your computer becomes disabled If this happens turn your computer off and then on again then enter the correct password If you have forgotten your password you need to clear the CMOS configuration Refer to Clearing the CMOS Configuration below for details on how...

Страница 32: ...he CMOS 4 Wait for a couple of seconds then place the jumper on pins 1 2 to re enable the configuration 5 Replace the cover Reconnect the power cord and any peripherals to the computer 6 Turn on the computer To set a new system password you will need to run the Setup program The jumper on these pins prevents any change to the CMOS configuration Refer to page 10 for the jumper position on the syste...

Страница 33: ...3 Upgrading and Adding Accessories ...

Страница 34: ...For example installing a network card can in conjunction with the necessary software and cables connect a computer to a network To find out more about installing expansion cards refer to Adding Accessories on page 48 StorageDevices A storage device is a device that stores software for example applications programs the operating system data and so on Hard disk drives CD ROM drives tape drives Zip d...

Страница 35: ...grade is possible Upgrades and Accessories You Can Install 16 MB 32 MB 64 MB or 128 MB Front Bezel CD ROM Drive bay 5 25 inch Accessory bay 5 25 inch Floppy or Hard Disk Drive bay 3 5 inch Floppy Disk Drive Drive A Second 3 5 inch Floppy Disk Zip or Tape Drive bay For example a sound card Contact your reseller for HP accessory part numbers ...

Страница 36: ...22 Why Upgradethe BIOS Hewlett Packard are continually improving the BIOS in their computers introducing new features and making them more efficient You can therefore keep your own computer up to date by upgrading the BIOS How DoIUpgradethe BIOS To upgrade your system BIOS download the appropriate BIOS utility from our support WEB site http www hp com go briosupport ...

Страница 37: ...emove the computer s cover to install accessories or to gain access to the system configuration jumpers Warning For your safety never remove the computer s cover without first removing the power cord and any connection to a telecommunications network Always replace the cover before reconnecting any cables to your computer ...

Страница 38: ...ck that you have installed all your accessories and that internal cables are properly connected and safely routed for example check that they will not interfere with the cover when it is replaced 2 Lower the cover onto the computer Position the cover so that there is a 1 5 cm gap between the front edge of the cover and the front bezel 3 While holding the cover as shown lift the cover up approximat...

Страница 39: ...ront bezel Secure the cover in place by replacing the four screws on the rear panel If required lock the cover using the key provided 5 Reconnect the power supply cords and any telecommunications cables Turn on the display and computer Note on some computers the screw positions may be higher than shown ...

Страница 40: ...e physical memory is not sufficient Virtual memory however is approximately 200 times slower than main memory The amount of main memory your computer requires depends on the operating system and the applications you use You may need more memory if you use memory hungry applications for example image processing and desktop publishing applications or if you run several applications at the same time ...

Страница 41: ... the socket one way round 4 Firmly press the memory module completely into the connector until the retaining clips click into position 5 If you need to remove a memory module perhaps because you are replacing an existing module refer to Removing a Memory Module below Caution Static electricity can damage electronic components Turn off all equipment Don t let your clothes touch the accessory To equ...

Страница 42: ...ted during the computer s startup routine press to view the error s and take any necessary action If you have any doubts about using the HP Setup program contact your reseller for help If you cannot start your computer properly remove the memory and try starting your computer again If the computer now starts without any problems there may be a problem with the new memory If you experience any othe...

Страница 43: ...speed the faster tasks can be performed Replacing the processor by one with a faster internal speed will improve the performance of your computer What Is the Fastest ProcessorICan Install New faster processors are being developed all the time Check with your reseller to find out the fastest processor that you can install in your computer Information about processor upgrades is also available at ht...

Страница 44: ... refer to Removing the Cover on page 38 2 On a table top turn the computer on its side with the system board closest to the surface of the table top 3 Remove the airflow guide covering the processor open the retaining clips on top of the airflow guide then lift it out of the computer System Board Retaining clips Processor and Processor Socket ...

Страница 45: ...ueeze the tabs on either side of the processor and gently pull the processor away from the system board Installing the New Processor 1 Slide the new processor into the processor socket and push gently until it snaps into place the processor can only go in one way ...

Страница 46: ...ation 1 Replace the airflow guide covering the processor Verify that the Fan cable is still connected to the Fan Chassis Connector on the system board 2 Install any other accessories before returning the computer to the upright position replacing the cover and reconnecting the power cords and any telecommunications cables 3 Turn on the display and computer The computer should recognize the new pro...

Страница 47: ...the processor If the new processor is still not recognized remove it and put the old processor back into the computer remember to reset any system board jumpers if necessary and then restart the computer If the computer now starts without any problems there may be a problem with the new processor If you experience any other problems as a result of the upgrade and your computer is supplied with the...

Страница 48: ...g the number of slots that are occupied This is the number of expansion cards that are installed How Many Expansion Cards Can IInstall Your computer supports up to five cards refer to page 12 The Windows operating system can automatically recognize and configure many expansion cards that you may want to install in your computer With other cards you will be required either to install a driver or to...

Страница 49: ...completely with the slot s connector and does not touch components on other cards 6 Secure the card with the retaining screw If you loosened the screws on adjacent faceplates remember to tighten them 7 Install any other accessories before returning the computer to the upright position replacing the cover and reconnecting the power cords and any telecommunications cables Turn on the display and the...

Страница 50: ...driver is not available and you have a driver disk select this option You then need to insert the disk and click the OK button Do not install a driver Windows will not prompt you again In this case the card will be installed but it will not work Select from a list of alternative drivers If you have just installed a non Plug and Play expansion card you will be required to either install a driver or...

Страница 51: ...a result of the upgrade and your computer is supplied with the HP Brio Center refer to the support tools for further assistance Fax Modem Card Warning Do not attempt to connect this product to the phone line during a lightning storm Never install telephone jacks in wet locations unless the telephone line has been disconnected at the network interface Never touch uninsulated telephone wires or term...

Страница 52: ... each end by its top edge If the card is tight loosen the screws on the adjacent slots Do not bend the card If you intend to replace the card later note which connector it is in 4 With its components facing up place the card on a clean flat solid static free surface Handle the card by its edges 5 Install any new accessories 6 Replace the expansion card if necessary refer to steps 5 and 6 on page 4...

Страница 53: ...ge Devices CanIAdd The number of storage devices that you can add to your computer is determined by the number of mounting bays that are unused and by the number of storage device interface channels that are unused Your computer has a 3 5 inch floppy disk drive and either a 3 5 inch or 5 25 inch hard disk drive already installed There may also be a CD ROM drive installed The on system board electr...

Страница 54: ...k drive cable This supports up to two floppy disk drives or one floppy disk drive and one tape drive One 3 5 inch floppy disk Drive A is already connected to the Master connector on this cable SystemBoard Connectors If you add a floppy disk drive hard disk drive CD ROM drive Zip drive or tape drive you need to connect it to power and data cables The connectors are shaped to fit one way only The da...

Страница 55: ...d connect it to the cable that the CD ROM drive is connected to the hard disk drive must be connected to the Master connector in the cable from the system board not the Slave connector If you have a CD ROM drive currently connected to the Master connector you must reconnect the CD ROM drive to the Slave connector of the cable and then attach the new hard disk drive to the Master connector Power Co...

Страница 56: ... back of the computer 3 Secure the drive to the computer using the four screws provided with the drive Two screws must be inserted in each side of the drive Using screws other than those provided may cause damage to the device 4 Connect the power and data cables to the rear of the drive Both connectors are shaped to fit one way only Use the second connector on the hard disk drive data cable Refer ...

Страница 57: ...ecognized you may need to run the Setup program restart the computer and press when Press F2 to enter SETUP is displayed at the bottom of the screen If you have any doubts about using the HP Setup program contact your reseller for help If the new drive is still not recognized check that you have correctly followed the installation procedure described above If there are any errors reported during t...

Страница 58: ...mputer by hooking your fingers in the gap and pulling it should still be connected at the top Then gently continue to pull the front bezel outwards until it is completely detached from the computer 2 Check that there are no mounting rails attached to the device If there are mounting rails attached you should remove them Table edge To remove the plastic panel from the bezel unclip and push outwards...

Страница 59: ...faceplate on the 5 25 inch bay by inserting a flathead screwdriver into the slot then push outward until the faceplate snaps off CD ROM Warning To avoid electric shock and harm to your eyes by laser light do not open the laser module The laser module should be serviced by service people only Do not attempt to make any adjustment to the laser unit Refer to the label on the CD ROM for power requirem...

Страница 60: ...nding on the type of drive you have installed you may need to install some driver software This could be done when you have returned to the operating system Troubleshooting If the new drive is not recognized you may need to run the Setup program restart the computer and press when Press F2 to enter SETUP is displayed at the bottom of the screen If you have any doubts about using the HP Setup progr...

Страница 61: ...osition Replace the cover and reconnecting the power cords and any telecommunications cables Run the Setup program to reconfigure the computer Warning There is a danger of explosion if the battery is incorrectly installed For your safety never attempt to recharge disassemble or burn the old battery Replace the battery only with the same type or equivalent type recommended by the manufacturer The b...

Страница 62: ...62 3 Upgrading and Adding Accessories Changing the Battery ...

Страница 63: ...4 AT Commands ...

Страница 64: ...ode and Command mode In either case the computer stays connected to remote modem ATA Manually answers incoming calls Modem does not answer the telephone A Repeats the last command line executed AT Attention Begins each command line except A Tests that your modem is working and configured correctly If characters you type do not appear on your screen your modem is not configured properly ATBn Switch...

Страница 65: ... 0 to 3 Calls exchange by flash Switches off calling tone during current dialing process H Terminates the dialing sequence and causes the modem to go offline after dialing so that you can conduct a normal voice conversation Example ATDT123456 H Pauses the register S8 time Waits for 5 seconds of silence Stays in Command Mode after dialing ATEn Controls the Echo function where n is either 0 or 1 1 E...

Страница 66: ...e n is a digit from 0 to 3 0 Modem speaker disabled 1 Low speaker volume 2 Medium speaker volume 3 High speaker volume ATMn Switches speaker on or off where n is a digit from 0 to 3 0 Speaker off 1 Speaker on until carrier detected 2 Speaker always on 3 Speaker on during handshake ATOn Returns online where n is either 0 or 1 0 Returns online 1 Returns online and retains ATQn Control modem response...

Страница 67: ...les The n parameter 0 or 1 is used to reset the modem to the preferred profile Any commands following the ATZn command are ignored AT N5 Makes MNP links only AT Cn Selects data compression for MNP or V 42 where n is a digit from 0 to 3 For data compression to work both the local and the remote modem must have compression capabilities The n parameters are 0 Compression is not authorized 1 Auto enab...

Страница 68: ...sponses are described in the table below the numeric equivalents are in parentheses AT F Modem returns to factory default settings AT Kn This command controls the flow control 0 Disables flow control 1 Enables RTS CTS hardware flow control default 2 Enables XON XOFF software flow control Command Description Message Description 00 OK The command was carried out successfully 01 CONNECT For X0 the mo...

Страница 69: ...igured to report line speed which is 2400 bps or modem is configured to report the DTE speed which is 2400 bps this response is disabled when X0 is in effect 11 CONNECT 4800 Modem is configured to report the DTE speed which is 4800 bps 1 12 CONNECT 9600 Modem is configured to report the DTE speed which is 9600 bps 1 13 CONNECT 7200 Modem is configured to report the DTE speed which is 7200 bps 1 14...

Страница 70: ...1200 75 Carrier transmit at 1200 bps receive at 75 bps 2 45 CARRIER 75 1200 V 22 or Bell 212 carrier detected at 1200 bps 2 46 CARRIER 1200 V 22 or Bell 212 carrier detected at 1200 bps 2 47 CARRIER 2400 V 22bis carrier detected at 2400 bps 2 48 CARRIER 4800 V 32bis or V 32 carrier detected at 4800 bps 2 49 CARRIER 7200 V 32bis carrier detected at 7200 bps 2 50 CARRIER 9600 V 32bis or V 32 carrier...

Страница 71: ...which is 24 000 bps 2 63 CONNECT 26 400 Modem is configured to report the DTE speed which is 26 400 bps 2 64 CONNECT 28 800 Modem is configured to report the DTE speed which is 28 800 bps 2 84 CONNECT 33 600 Modem is configured to report the DTE speed which is 33 600 bps 2 91 CONNECT 31 200 Modem is configured to report the DTE speed which is 31 200 bps 2 66 COMPRESSION CLASS 5 MNP 5 compression n...

Страница 72: ...de an MNP connection 2 81 PROTOCOL ALT CELLULAR Modem has made an MNP 10 connection 2 1 Response is enabled by the V1 command and ignored when the W1 command is in effect 2 These negotiation progress responses are sent when the W1 command is in effect Message Description ...

Страница 73: ... the clock rate DAT Digital Audio Tape Device driver Software that enables the computer to work with a specific peripheral such as a printer DIMM Dual In line Memory Module 64 or 72 bit data path DMA Direct Memory Access A DMA channel allows certain types of data transfer between RAM and a device to bypass the microprocessor DMA channel Direct Memory Access channel Speeds up I O to and from the sy...

Страница 74: ...mount of memory available in the computer MIDI Musical Instrument Digital Interface An international hardware software standard that specifies the cable and hardware interface that allows several devices instruments and computers to interchange music codes and events MPEG Motion Picture Expert Group A standard for video sequence compression You can play back MPEG files from the WEB or a video CD R...

Страница 75: ... devices to computer Serial ports allow connections to a mouse modem or printer Setup program Used to inform the computer about its configuration for example the amount of memory installed the date and time disk controllers and so forth The Setup program is stored in ROM on the system board Sound files Files containing sound data Sound files are usually stored in one of two formats with the extens...

Страница 76: ...Glossary ...

Страница 77: ...e 54 cover removing 37 replacing 38 D DAT player connecting 14 DMA channels explanation 73 E enhanced keyboard creating shortcuts 19 20 using enhanced keys 18 error messages Beep codes 29 expansion card Plug and Play 48 49 removing 52 expansion card slots 12 external amplifier connecting 14 F fan chassis connector 10 floppy disk drive 53 floppy disk drive connector 10 floppy disk drive installing ...

Страница 78: ...ages and LED key enhanced keyboard 18 MIC jack 14 microphone connecting 14 MIDI defined 74 MIDI instrument connecting 14 Minidisc player connecting 14 modem response messages 68 P passwords password on boot 26 setting a password in the BIOS 26 Plug and Play card 48 49 POST Beep codes table 29 power key enhanced keyboard 18 power menu HP Setup program 23 power supply connector 10 Power On Self Test...

Страница 79: ...ctors 11 system characteristics power consumption 16 system recovery if incorrect password on startup 31 the system startup fails 30 you need to clear the CMOS 31 T tape deck connecting 14 tape drive installing 53 troubleshooting installing a processor 47 installing an expansion card 50 installing drives 60 installing main memory modules 42 installing storage devices 57 TV tuner connecting 15 V vo...

Страница 80: ...Index ...

Страница 81: ......

Страница 82: ......

Результаты поиска

Содержание Brio 8500

Отзывы:

Похожие инструкции для Brio 8500

Бренды по названию

Популярные бренды

HP Brio 8500, Онлайн-руководство

Результаты поиска

Содержание Brio 8500

Отзывы:

Похожие инструкции для Brio 8500

Бренды по названию

Популярные бренды