ASROCK B75M-DGS R2.0 User Manual Download

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Chapter 1: Introduction

Thank you for purchasing ASRock

B75M-DGS R2.0

motherboard, a reliable moth-

erboard produced under ASRock’s consistently stringent quality control. It delivers
excellent performance with robust design conforming to ASRock’s commitment to

quality and endurance.

In this manual, chapter 1 and 2 contains introduction of the motherboard and step-

by-step guide to the hardware installation. Chapter 3 and 4 contains the conigura

tion guide to BIOS setup and information of the Support CD.

Because the motherboard speciications and the BIOS software might be

updated, the content of this manual will be subject to change without no-

tice. In case any modiications of this manual occur, the updated version
will be available on ASRock website without further notice. You may ind

the latest VGA cards and CPU support lists on ASRock website as well.

ASRock website http://www.asrock.com

If you require technical support related to this motherboard, please visit

our website for speciic information about the model you are using.

www.asrock.com/support/index.asp

1.1 Package Contents

ASRock

B75M-DGS R2.0

Motherboard (Micro ATX Form Factor)

ASRock

B75M-DGS R2.0

Quick Installation Guide

ASRock

B75M-DGS R2.0

Support CD

2 x Serial ATA (SATA) Data Cables (Optional)

1 x I/O Panel Shield

ASRock Reminds You...

To get better performance in Windows

8 / 8 64-bit / 7 / 7 64-bit / Vista

Vista

64-bit, it is recommended to set the BIOS option in Storage Con-

iguration to AHCI mode.

Summary of Contents for B75M-DGS R2.0

Page 2: ...ies or conditions of merchantability or itness for a particular purpose In no event shall ASRock its directors oficers employees or agents be liable for any indirect special incidental or consequential damages including damages for loss of proits loss of business loss of data interruption of business and the like even if ASRock has been advised of the possibility of such damages arising from any d...

Page 3: ...and Surround Display Features 22 2 8 Jumpers Setup 25 2 9 Onboard Headers and Connectors 26 2 10 Serial ATA SATA Serial ATA2 SATA2 Serial ATA3 SATA3 Hard Disks Installation 31 2 11 Hot Plug for SATA SATA2 SATA3 HDDs 31 2 12 SATA SATA2 SATA3 HDD Hot Plug Feature and Operation Guide 32 2 13 Driver Installation Guide 34 2 14 Installing Windows 8 8 64 bit 7 7 64 bit VistaTM VistaTM 64 bit XP XP 64 bit...

Page 4: ...Intel R Rapid Start Technology 48 3 4 6 Intel R Smart Connect Technology 49 3 4 7 Super IO Coniguration 50 3 4 8 ACPI Coniguration 51 3 4 9 USB Coniguration 52 3 4 10 Trusted Computing 53 3 5 Tool 54 3 6 Hardware Health Event Monitoring Screen 57 3 7 Boot Screen 58 3 8 Security Screen 60 3 9 Exit Screen 61 4 Software Support 62 4 1 Install Operating System 62 4 2 Support CD Information 62 4 2 1 Ru...

Page 5: ...ange without no tice In case any modiications of this manual occur the updated version will be available on ASRock website without further notice You may ind the latest VGA cards and CPU support lists on ASRock website as well ASRock website http www asrock com If you require technical support related to this motherboard please visit our website for speciic information about the model you are usin...

Page 6: ...x16 slot PCIE1 x16 mode see CAUTION 3 PCIE 3 0 is only supported with Intel Ivy Bridge CPU With Intel Sandy Bridge CPU it only supports PCIE 2 0 1 x PCI slot Graphics Intel HD Graphics Built in Visuals and the VGA outputs can be supported only with processors which are GPU integrated Supports Intel HD Graphics Built in Visuals Intel Quick Sync Video 2 0 Intel InTruTM 3D Intel Clear Video HD Techno...

Page 7: ...el 1 x PS 2 Mouse Port 1 x PS 2 Keyboard Port 1 x D Sub Port 1 x DVI D Port 4 x Ready to Use USB 2 0 Ports 2 x Ready to Use USB 3 0 Ports 1 x RJ 45 LAN Port with LED ACT LINK LED and SPEED LED HD Audio Jack Line in Front Speaker Microphone SATA3 1 x SATA3 6 0 Gb s connector supports NCQ AHCI and Hot Plug functions USB3 0 2 x Rear USB 3 0 ports support USB 1 1 2 0 3 0 up to 5Gb s 1 x Front USB 3 0 ...

Page 8: ...assis Quiet Fan Allows Chassis Fan Speed Auto Adjust by CPU Temperature CPU Chassis Fan Multi Speed Control CASE OPEN detection Voltage Monitoring 12V 5V 3 3V CPU Vcore OS Microsoft Windows 8 8 64 bit 7 7 64 bit VistaTM VistaTM 64 bit XP XP 64 bit compliant see CAUTION 4 Certiications FCC CE WHQL ErP EuP Ready ErP EuP ready power supply is required For detailed product information please visit our...

Page 9: ...vation for system usage under Windows 8 7 VistaTM XP For Windows OS with 64 bit CPU there is no such limitation You can use ASRock XFast RAM to utilize the memory that Windows cannot use 3 Only PCIE1 slot supports Gen 3 speed To run the PCI Express in Gen 3 speed please install an Ivy Bridge CPU If you install a Sandy Bridge CPU the PCI Express will run only at PCI Ex press Gen 2 speed 4 ASRock XF...

Page 10: ...nstant Boot ASRock Instant Boot allows you to turn on your PC in just a few seconds provides a much more eficient way to save energy time money and improves system running speed for your sys tem It leverages the S3 and S4 ACPI features which normally enable the Sleep Standby and Hibernation modes in Windows to shorten boot up time By calling S3 and S4 at speciic timing during the shutdown and star...

Page 11: ... LAN provides a faster internet access which includes the benefits listed below LAN Application Prioritiza tion You can conigure your application s priority ideally and or add new programs Lower Latency in Game After setting online game s priority higher it can lower the latency in games Trafic Shaping You can watch Youtube HD videos and download si multaneously Real Time Analysis of Your Data Wit...

Page 12: ...I firmware updates from our servers In other words the system can auto detect the latest UEFI from our servers and lash them without entering Windows OS Please note that you must be running on a DHCP conigured computer in order to enable this function ASRock UEFI System Browser ASRock UEFI system browser is a useful tool included in graphical UEFI It can detect the devices and configurations that ...

Page 13: ...er the UEFI automatically when turning on the PC next time Just simply enable this function the PC will be assured to access the UEFI directly in the very beginning ASRock Good Night LED ASRock Good Night LED technology can offer you a better en vironment by extinguishing the unessential LED By enabling Good Night LED in BIOS the Power HDD LAN LED will be switched off when system is on Not only th...

Page 14: ... RAM 1 CI1 25 DVI1 1 Front USB 3 0 TPMS1 1 26 1 ATX 12V Power Connector ATX12V1 2 Power Fan Connector PWR_FAN1 3 ATX Power Connector ATXPWR1 4 1155 Pin CPU Socket 5 CPU Fan Connector CPU_FAN1 6 2 x 240 pin DDR3 DIMM Slots DDR3_A1 DDR3_B1 7 USB 3 0 Header USB3_2_3 8 SATA2 Connector SATA2_1 9 SATA3 Connector SATA3_0 10 SPI Flash Memory 64Mb 11 PCI Express 3 0 x16 Slot PCIE1 12 Intel B75 Chipset 13 C...

Page 15: ... you need to connect a front panel audio cable to the front panel audio header Please refer to below steps for the software setting of Multi Streaming For Windows XP After restarting your computer you will ind Mixer tool on your system Please select Mixer ToolBox click Enable playback multi streaming and click ok Choose 2CH or 4CH and then you are allowed to select Realtek HDA Primary output to us...

Page 16: ...Unplug the power cord from the wall socket before touching any components 2 To avoid damaging the motherboard s components due to static electricity NEVER place your motherboard directly on the carpet or the like Also remember to use a grounded wrist strap or touch a safety grounded object before you handle the components 3 Hold components by the edges and do not touch the ICs 4 Whenever you unins...

Page 17: ...Otherwise the CPU will be seriously damaged Step 1 Open the socket Step 1 1 Disengage the lever by pressing it down and sliding it out of the hook Step 1 2 Keep the lever positioned at about 135 degrees in order to flip up the load plate Step 2 Remove the PnP Cap Pick and Place Cap 1 It is recommended to use the cap tab to handle and avoid kicking off the PnP cap 2 This cap must be placed if retur...

Page 18: ...o match the two orientation key notches of the CPU with the two alignment keys of the socket Step 3 3 Carefully place the CPU into the socket by using a purely vertical mo tion Step 3 4 Verify that the CPU is within the sock et and properly mated to the orient keys Step 4 Close the socket Step 4 1 Flip the load plate onto the IHS Step 4 2 Press down the load lever and se cure it with the load plat...

Page 19: ...or 1155 Pin CPUs Step 1 Apply thermal interface material onto the cen ter of the IHS on the socket s surface Step 2 Place the heatsink onto the socket Ensure that the fan cables are oriented on side closest to the CPU fan connector on the motherboard CPU_FAN1 see page 14 No 5 Step 3 Align fasteners with the motherboard through holes Step 4 Rotate the fastener clockwise then press down on fastener ...

Page 20: ...it is unable to activate Dual Channel Memory Technology 3 Some DDR3 1GB double sided DIMMs with 16 chips may not work on this motherboard It is not recommended to install them on this motherboard Installing a DIMM Please make sure to disconnect power supply before adding or removing DIMMs or the system components Step 1 Unlock a DIMM slot by pressing the retaining clips outward Step 2 Align a DIMM...

Page 21: ... 2 speed Installing an expansion card Step 1 Before installing an expansion card please make sure that the power supply is switched off or the power cord is unplugged Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation Step 2 Remove the system unit cover if your motherboard is already installed in a chassis Step 3 ...

Page 22: ...erboard supports dual monitor feature With the internal VGA output sup port DVI D and D Sub you can easily enjoy the beneits of dual monitor feature without installing any add on VGA card to this motherboard This motherboard also provides independent display controllers for DVI D and D Sub to support dual VGA output so that DVI D and D sub can drive same or different display contents To enable dua...

Page 23: ...nboard VGA Share Memory Auto will disable D Sub function when the add on VGA card is inserted to this motherboard 4 Install the onboard VGA driver and the add on PCI Express VGA card driver to your system If you have installed the drivers already there is no need to install them again 5 Set up a multi monitor display For Windows XP XP 64 bit OS Right click the desktop choose Properties and select ...

Page 24: ...ell Therefore you can enjoy the superior display quality with high deinition HDCP encryption contents Please refer to below instruction for more details about HDCP function What is HDCP HDCP stands for High Bandwidth Digital Content Protection a speciication developed by Intel for protecting digital entertainment content that uses the DVI interface HDCP is a copy protection scheme to eliminate the...

Page 25: ...puter and unplug the power cord from the power supply After waiting for 15 seconds use a jumper cap to short pin2 and pin3 on CLRCMOS1 for 5 seconds However please do not clear the CMOS right after you update the BIOS If you need to clear the CMOS when you just inish updating the BIOS you must boot up the system irst and then shut it down before you do the clear CMOS ac tion Please be noted that t...

Page 26: ... up to 3 0 Gb s data transfer rate Serial ATA3 Connector This Serial ATA3 SATA3 SATA3_0 see p 14 No 9 connector supports SATA data cables for internal storage devices The current SATA3 interface allows up to 6 0 Gb s data transfer rate Serial ATA SATA Either end of the SATA data Data Cable cable can be connected to the Optional SATA SATA2 SATA3 hard disk or the SATA2 SATA3 connector on this mother...

Page 27: ... to MIC2_L B Connect Audio_R RIN to OUT2_R and Audio_L LIN to OUT2_L USB 3 0 Header Besides two default USB 3 0 19 pin USB3_2_3 ports on the I O panel there is see p 14 No 7 one USB 3 0 header on this motherboard This USB 3 0 header can support two USB 3 0 ports Infrared Module Header This header supports an 5 pin IR1 optional wireless transmitting see p 14 No 25 and receiving infrared module J_SE...

Page 28: ...may conigure the way to turn off your system using the power switch RESET Reset Switch Connect to the reset switch on the chassis front panel Press the reset switch to restart the computer if the computer freezes and fails to perform a normal restart PLED System Power LED Connect to the power status indicator on the chassis front panel The LED is on when the system is operating The LED keeps blink...

Page 29: ...ctor on this motherboard please connect it to Pin 1 3 3 Pin Fan Installation Pin 1 3 Connected ATX Power Connector Please connect an ATX power 24 pin ATXPWR1 supply to this connector see p 14 No 3 ATX 12V Power Connector Please connect an ATX 12V 4 pin ATX12V1 power supply to this connector see p 14 No 1 FAN_SPEED_CONTROL GND 12V CHA_FAN_SPEED GND 12V CPU_FAN_SPEED FAN_SPEED_CONTROL 4 3 2 1 Though...

Page 30: ...trusion detection design 1 Signal GND Serial port Header This COM1 header supports a 9 pin COM1 serial port module see p 14 No 20 TPM Header This connector supports 17 pin TPMS1 Trusted Platform Module TPM see p 14 No 23 system which can securely store keys digital certiicates passwords and data A TPM system also helps enhance network security protects digital identities and ensures platform integ...

Page 31: ...o the motherboard s SATA2 SATA3 connector STEP 4 Connect the other end of the SATA data cable to the SATA SATA2 SATA3 hard disk 2 11 Hot Plug for SATA SATA2 SATA3 HDDs This motherboard supports Hot Plug for SATA SATA2 SATA3 in AHCI mode Intel B75 chipset provides hardware support for Advanced Host controller Interface AHCI a new programming interface for SATA host controllers developed through a j...

Page 32: ...interface The SATA 15 pin power connector Black connect to SATA SATA2 SATA3 HDD Points of attention before you process the Hot Plug 1 Below operation procedure is designed only for our motherboard which supports SATA SATA2 SATA3 HDD Hot Plug The SATA SATA2 SATA3 Hot Plug feature might not be supported by the chipset because of its limitation the SATA SATA2 SATA3 Hot Plug support information of our...

Page 33: ...cable to the SATA SATA2 SATA3 HDD How to Hot Unplug a SATA SATA2 SATA3 HDD Points of attention before you process the Hot Unplug Please do follow below instruction sequence to process the Hot Unplug improper procedure will cause the SATA SATA2 SATA3 HDD damage and data loss Please connect a SATA power cable s 1x4 pin end White to the power supply s 1x4 pin cable Step 1 Step 2 Step 3 Step 4 Step 2 ...

Page 34: ...nt to install Windows 8 8 64 bit 7 7 64 bit VistaTM VistaTM 64 bit XP XP 64 bit OS on your SATA SATA2 SATA3 HDDs without RAID functions please follow the procedures below according to the OS you install 2 14 1 Installing Windows XP XP 64 bit Without RAID Functions If you want to install Windows XP XP 64 bit OS on your SATA SATA2 SATA3 HDDs without RAID functions please follow the steps below STEP ...

Page 35: ...th NCQ function STEP 1 Set Up UEFI A Enter UEFI SETUP UTILITY Advanced screen Storage Coniguration B Set the option SATA Mode Selection to AHCI STEP 2 Install Windows 8 8 64 bit 7 7 64 bit VistaTM VistaTM 64 bit OS on your system Using SATA SATA2 SATA3 HDDs without NCQ function STEP 1 Set Up UEFI A Enter UEFI SETUP UTILITY Advanced screen Storage Coniguration B Set the option SATA Mode Selection t...

Page 36: ...ause the UEFI software is constantly being updated the following UEFI setup screens and descriptions are for reference purpose only and they may not exactly match what you see on your screen 3 1 1 UEFI Menu Bar The top of the screen has a menu bar with the following selections Main To set up the system time date information OC Tweaker To set up overclocking features Advanced To set up the advanced...

Page 37: ...e PGDN Go to the next page HOME Go to the top of the screen END Go to the bottom of the screen F1 To display the General Help Screen F7 Discard changes and exit the UEFI SETUP UTILITY F9 Load optimal default values for all the settings F10 Save changes and exit the UEFI SETUP UTILITY F12 Print screen ESC Jump to the Exit Screen or exit the current screen 3 2 Main Screen When you enter the UEFI SET...

Page 38: ...Intel SpeedStep technology Please note that enabling this function may reduce CPU voltage and lead to system stability or compatibility issues with some power supplies Please set this item to Disabled if above issues occur Intel Turbo Boost Technology Use this item to enable or disable Intel Turbo Boost Mode Technology Turbo Boost Mode allows processor cores to run faster than marked fre quency in...

Page 39: ...ue is Disabled DRAM Timing Coniguration Load XMP Setting Use this to load XMP setting Coniguration options Auto Default Proile 1 and Proile 2 The default value is Auto DRAM Frequency If Auto is selected the motherboard will detect the memory module s inserted and assign the appropriate frequency automatically DRAM Coniguration DRAM tCL Use this item to change CAS Latency tCL Auto Manual setting Th...

Page 40: ...nge RAS to RAS Delay tRRD Auto Manual setting The default is Auto DRAM tWTR Use this item to change Write to Read Delay tWTR Auto Manual setting The default is Auto DRAM tRTP Use this item to change Read to Precharge tRTP Auto Manual setting The default is Auto DRAM tFAW Use this item to change Four Activate Window tFAW Auto Manual set ting The default is Auto DRAM tCWL Use this item to change CAS...

Page 41: ...T WR CHB Use this item to change ODT WR CHB setting The default is Auto ODT NOM CHA Use this item to change ODT NOM CHA setting The default is Auto ODT NOM CHB Use this item to change ODT NOM CHB setting The default is Auto DRAM Clock Delay Use this to conigure DRAM Clock Delay The default is Auto MRC Fast Boot Use this item to enable or disable MRC Fast Boot The default is Enabled DIMM Exit Mode ...

Page 42: ...this section you may set the conigurations for the following items CPU Conigu ration North Bridge Coniguration South Bridge Coniguration Storage Conigura tion Intel R Rapid Start Technology Intel R Smart Connect Technology Super IO Coniguration ACPI Coniguration USB Coniguration and Trusted Computing ...

Page 43: ...default value is All Enhance Halt State C1E All processors support the Halt State C1 The C1 state is supported through the native processor instructions HLT and MWAIT and requires no hardware support from the chipset In the C1 power state the processor maintains the context of the system caches CPU C3 State Support Use this to enable or disable CPU C3 ACPI C2 report to OS CPU C6 State Support Use ...

Page 44: ...tion Intel Virtualization Technology When this option is set to Enabled a VMM Virtual Machine Architecture can utilize the additional hardware capabilities provided by Vanderpool Technology This option will be hidden if the installed CPU does not support Intel Virtualization Technology Hardware Prefetcher Use this item to turn on off the MLC streamer prefetcher Adjacent Cache Line Prefetch Use thi...

Page 45: ...fault value is Auto Share Memory This allows you to set onboard VGA share memory feature The default value is Auto IGPU Multi Monitor This allows you to enable or disable IGPU Multi Monitor The default value is Disabled If you wish to install a PCI Express card under Windows XP VistaTM OS please disable this option Render Standby Use this to enable or disable Render Standby by Internal Graphics De...

Page 46: ...dio feature Onboard LAN This allows you to enable or disable the Onboard LAN feature Deep Sleep Mobile platforms support Deep S4 S5 in DC only and desktop platforms support Deep S4 S5 in AC only The default value is Enabled in S5 Restore on AC Power Loss This allows you to set the power state after an unexpected AC power loss If Power Off is selected the AC power remains off when the power recover...

Page 47: ...I Mode AHCI Advanced Host Controller Interface supports NCQ and other new features that will improve SATA disk performance but IDE mode does not have these advantages SATA Aggressive Link Power Management Use this item to conigure SATA Aggressive Link Power Management Hard Disk S M A R T Use this item to enable or disable the S M A R T Self Monitoring Analy sis and Reporting Technology feature Con...

Page 48: ...R Rapid Start Technology is a new zero power hibernation mode which al lows users to resume in just 5 6 seconds The default is Enabled Entry After Select a time to enable RTC wake timer at S3 entry The default is 10 minutes Active Page Threshold Support This allows you to enable or disable Active Page Threshold Support The default is Disabled ...

Page 49: ...ct Technology Use this item to enable or disable Intel R Smart Connect Technology Intel R Smart Connect Technology keeps your e mail and social networks such as Twitter Facebook etc updated automatically while the computer is in sleep mode The default is Enabled ...

Page 50: ...r the onboard serial port Coniguration options 3F8h IRQ4 and 3E8h IRQ4 Infrared Port Use this item to enable or disable the onboard infrared port Parallel Port Use this item to enable or disable the onboard parallel port Change Settings Use this item to select an optional setting for Super IO device Device Mode Use this item to change the Printer Port mode ...

Page 51: ...On Use this item to enable or disable PS 2 keyboard to turn on the system from the power soft off mode PCI Devices Power On Use this item to enable or disable PCI devices to turn on the system from the power soft off mode Ring In Power On Use this item to enable or disable Ring In signals to turn on the system from the power soft off mode RTC Alarm Power On Use this item to enable or disable RTC R...

Page 52: ... the details of these four options Enabled Enables support for legacy USB Auto Enables legacy support if USB devices are connected Disabled USB devices are not allowed to use under legacy OS and UEFI setup when Disabled is selected If you have USB compatibility is sues it is recommended to select Disabled to enter OS UEFI Setup Only USB devices are allowed to use only under UEFI setup and Windows ...

Page 53: ...53 4 4 10 Trusted Computing Security Device Support Enable to activate Trusted Platform Module TPM security for your hard disk drives ...

Page 54: ...is a UEFI lash utility embedded in Flash ROM This conve nient UEFI update tool allows you to update system UEFI without enter ing operating systems irst like MS DOS or Windows Just save the new UEFI ile to your USB lash drive loppy disk or hard drive and launch this tool then you can update your UEFI only in a few clicks without prepar ing an additional loppy diskette or other complicated lash uti...

Page 55: ...rmware download server for Internet Flash Coniguration options Asia Europe USA and China Dehumidiier Function Users may prevent motherboard damages due to dampness by enabling Dehumidiier Function When enabling Dehumidiier Function the com puter will power on automatically to dehumidify the system after entering S4 S5 state Dehumidiier Period This allows users to conigure the period of time until ...

Page 56: ...56 Would you like to save current setting user defaults In this option you are allowed to load and save three user defaults according to your own requirements ...

Page 57: ...n 1 s speed Coniguration options Full On and Automatic Mode The default value is Full On Chassis Fan 1 Setting This allows you to set chassis fan 1 s speed Coniguration options Full On Automatic Mode and Manual The default value is Full On Case Open Feature This allows you to enable or disable case open detection feature The default is value Enabled Clear Status This option appears only when the c...

Page 58: ...ction is you may not boot by using an USB lash drive Ultra Fast There are a few restrictions 1 Only supports Windows 8 UEFI operating system 2 You will not be able to enter BIOS Setup Clear CMOS or run utility in Widows to enter BIOS Setup 3 If you are using an external graphics card the VBIOS must support UEFI GOP in order to boot Boot From Onboard LAN Use this item to enable or disable the Boot ...

Page 59: ... If you enable the option Full Screen Logo but you want to see the AddOn ROM information when the system boots please select Enabled Coniguration options Enabled and Disabled The default value is Enabled Boot Failure Guard Enable or disable the feature of Boot Failure Guard Boot Failure Guard Count Enable or disable the feature of Boot Failure Guard Count ...

Page 60: ... Screen In this section you may set or change the supervisor user password for the system For the user password you may also clear it Secure Boot Use this to enable or disable Secure Boot The default value is Disabled ...

Page 61: ...owing message Discard changes and exit setup Select OK to exit the UEFI SETUP UTILITY without saving any changes Discard Changes When you select this option it will pop out the following message Discard changes Select OK to discard all changes Load UEFI Defaults Load UEFI default values for all the setup questions F9 key can be used for this operation Launch EFI Shell from ilesystem device Attempt...

Page 62: ...D into your CD ROM drive The CD automatically displays the Main Menu if AUTORUN is enabled in your computer If the Main Menu does not appear automatically locate and double click on the ile ASRSETUP EXE in the Support CD to display the menu 4 2 2 Drivers Menu The Drivers Menu shows the available device s drivers if the system detects installed devices Please install the necessary drivers to activa...

Page 63: ...SP2 or above Windows 7 64 bit with SP1 or above or Windows 8 64 bit 2 Press F2 or Delete at system POST Set AHCI Mode in UEFI Setup Utility Advanced Storage Coniguration SATA Mode 3 Choose the item UEFI xxx to boot in UEFI Setup Utility Boot Boot Option 1 xxx is the device which contains your Windows installation iles Normally it is an optical drive You can also press F11 to launch boot menu at sy...

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