**************************************************************************** WIN9X.TXT ***************************************************************************** INSTALLATION GUIDE FOR THE SDMS DRIVERS: SYMC8XX.MPD V4.15.00 SYM_HI.MPD V4.15.00 SYM_U3.MPD V5.06.00 This file describes the features and use of the Symbios SDMS device drivers for the Windows 95/98 operating system environment. LSI Logic uses the same filenames for their drivers for different Windows operating systems. The driver files are packaged either in separate subdirectories based on the Windows operating system or on different flex disks. To determine the driver file for Windows 95/98, note that the filename ends with ".mpd". For example SYMC8XX.MPD. This file contains these sections: Introduction for Windows 95/98 Features Symbios Devices Supported Description Installing Your SYMC8XX.MPD/SYM_HI.MPD/SYM_U3.MPD Driver(s) Preparing a Symbios Driver Diskette New System Installation Existing System Installation Existing System Using ASPI8XX.SYS DOS ASPI Driver Verifying Correct Driver Installation Troubleshooting Command Line Options Enabling/Disabling Ultra SCSI Support Disabling Auto Request Sense Support Disabling Domain Validation Suport Enabling SCAM Support Multiple Symbios Host Adapter Considerations *********************** Introduction for Windows 95/98 *********************** Windows 95/98 is an operating system designed to run on Intel processors using current technology. It provides a graphical user interface environment incorporating many high-level features. Refer to the Microsoft Windows 95/98 documentation for details. An I/O manager handles I/O requests in Windows 95/98. To address a SCSI peripheral, the I/O manager goes through the appropriate drivers. Class drivers for hard disk, floptical, CD-ROM, printer, and scanner peripherals are provided in Windows 95/98. Other class drivers, provided by peripheral manufacturers, are added to support new devices. LSI Logic and Microsoft provide miniport drivers, called SYMC8XX.MPD, SYM_HI.MPD, and SYM_U3.MPD to complete the path to a Symbios controller or processor with an optional SDMS SCSI BIOS. The following sections describe these drivers and their installation. * * * * * * * * * * * Features * * * * * * * * * * * * The Symbios miniport drivers support these features: o Ultra160 data transfers (for devices that support this feature) o Domain Validation o Synchronous negotiation (including Fast/Ultra SCSI/Ultra2 SCSI) o Wide negotiation o Auto Request Sense o Multiple host adapters o Multiple Logical Unit Numbers (LUNs) o Disconnect/Reselect o Scatter/Gather o Differential Support o SCSI pass-through functionality o SCAM Support (SCSI Configured AutoMatically) o Target initiated negotiation support o NVRAM support (wide/sync parameters, SCSI Host ID, SCAM ON/OFF) * * * * * * * * Symbios Devices Supported * * * * * * * * * The SYMC8XX.MPD driver supports the following devices and Symbios host adapters based on those devices: o SYM53C810, SYM53C810A, SYM53C810AE (SYM8100S, SYM8100ASP, SYM20810) o SYM53C815 (SYM815XS, SYM8150SP) o SYM53C825, SYM53C825A (SYM8250S, SYM8251S, SYM8251D, SYM8250ASP, SYM8251ASP, SYM8251AD) o SYM53C860, SYM53C860AE (SYM8600SP, SYM20860) o SYM53C875, SYM53C875E (SYM8750SP, SYM8751SP, SYM8751SPE, SYM8751D) o SYM53C876 (SYM22801, SYM22802) o SYM53C885 o SYM53C895, (SYM8951U, SYM8952U) The SYM_HI.MPD driver supports the following devices and associated Symbios host adapters: o SYM53C895A (SYM8953U) o SYM53C896 (SYM22910, SYM21002, SYM22902) The SYM_U3.MPD driver supports the following devices and associated Symbios host adapter: o SYM53C1010-33 (SYM8955U, SYM21040) * * * * * * * * * * * Description * * * * * * * * * * * SYMC8XX.MPD, SYM_HI.MPD, and SYM_U3.MPD are designed to the Microsoft speci- fication for miniport drivers. These drivers allow connection of SCSI devices including disk drives, CD-ROMs, and tape drives for PCI-based machines. To support a new SCSI device, the Windows 95/98 architecture requires that a class driver for that type device is present (usually supplied by Microsoft, or possibly by the peripheral manufacturer). No changes to SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD are required. These drivers are only supported under Windows 95/98. SCSI commands are passed directly from a Windows application to the SCSI devices by using the SCSI pass-through facility (refer to Microsoft Windows 95/98 documentation for details). This facility allows applications to directly control and access SCSI devices by filling in a data structure and calling in to the port driver. The SYMC8XX.MPD and SYM_HI.MPD drivers support Ultra SCSI protocol, providing twice the raw data transfer rate of Fast SCSI for disk drives and Symbios host adapters that support Ultra SCSI. These drivers also support Ultra2 SCSI protocol, providing quadruple the raw data transfer rate of Fast SCSI. The SYM_U3.MPD driver supports Ultra160 SCSI protocol providing 80 Mbytes/s of data transfer and up to 160 Mbytes/s data transfer for double transition. Caution: Ultra SCSI requires more stringent SCSI bus cabling setups than Fast SCSI. Ultra2 and Ultra160 SCSI require Low-Voltage Differential (LVD) termination. *********** Installing Your SYMC8XX.MPD/SYM_HI.MPD/SYM_U3.MPD Driver ********** * * * * * * * * Preparing a Symbios Driver Diskette * * * * * * Copy the files listed below for the appropriate driver (supplied to you on distribution media) to the root directory of a clean floppy diskette, and use this Symbios Driver diskette during installation. For the SYMC8XX.MPD driver: SYMC8XX.MPD SYMC8XX.INF For the SYM_HI.MPD driver: SYM_HI.MPD SYM_HI.INF For the SYM_U3.MPD driver: SYM_U3.MPD SYM_U3.INF * * * * * * * * * New System Installation * * * * * * * * * This procedure installs the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD driver onto a Windows 95/98 system for all new system installations. Use this procedure when initially upgrading to Windows 95/98. Windows 95/98 automatically adds the driver to the registry and copies the driver to the appropriate directories. NOTE: Some Symbios PCI SCSI host adapters are supported by a driver bundled in Windows 95/98. For these adapters, the bundled driver is automatically installed during Windows 95/98 Setup. To change to the newer SYMC8XX.MPD, SYM_HI.MPD or SYM_U3.MPD driver, follow the instructions under "Existing System Installation" after the Windows 95/98 installation has completed. 1. Start the Windows 95/98 Setup according to the Microsoft instructions. 2. Setup enters the hardware detection phase after a system reboot. The "Setting up Hardware" message box appears. If the message "Symbios PCI SCSI Host Adapter" appears, then the host adapter supports the bundled driver, and it installs automatically. After the Windows 95/98 installation has completed, the user can install the SYMC8XX.MPD, SYM_HI.MPD, and/or SYM_U3.MPD drivers according to the "Existing System Installation" instructions. 3. If the bundled driver does not support the host adapter, Setup displays a New Hardware Found - PCI SCSI Bus Controller dialog box. Select "Driver from disk provided by hardware manufacturer" and click OK. Note: If ASPI8XX.SYS (the Symbios SDMS 4.0 DOS ASPI driver) is loaded when beginning the Windows 95/98 installation, no messages about PCI SCSI Bus Controllers will appear. The installation completes, but real-mode disk drivers are used. See the section below on "Verifying Correct Driver Installation." To install the SYMC8XX.MPD, SYM_HI.MPD, and/or SYM_U3.MPD drivers, (which disable loading of the ASPI8XX.SYS driver under Windows 95/98) see the section on "Existing System Using ASPI8XX.SYS DOS ASPI Driver" below. 4. Insert the Symbios Driver diskette into drive A: (or B:) (the one prepared in * Preparing a Symbios Driver Diskette *) and click OK. If using drive B:, you must select it from the pick list. Windows 95/98 automatically copies the appropriate driver files and rebuilds its driver database. A "System Settings Change" dialog box appears. 5. Remove the diskette from the drive and click Yes to restart the computer. At this point, Windows 95/98 Setup has completed, and the new driver is operational. To verify this, see the section "Verifying Correct Driver Installation." * * * * * * * * * Existing System Installation * * * * * * * * This procedure installs the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD driver onto an existing Windows 95/98 system. These instructions indicate where specific information applies to Windows 95 or Windows 98. Unnless noted, the instructions apply to both operating systems. Please review the steps below before beginning the installation. 1. Boot Windows 95/98. 2. Click Start. Select Settings-->Control Panel. 3. Double click on the System icon. 4. Click on the Device Manager tab. Note: If the SCSI controllers entry, or the PCI Symbios C8XX SCSI Host Adapter entry do not exist, the system is probably using the ASPI8XX.SYS DOS ASPI driver. See the "Existing System Using ASPI8XX.SYS DOS ASPI Driver" section below. 5. Either double click on the SCSI controllers entry, or click once on the plus sign to the left of it. 6. Select the desired PCI Symbios xxx SCSI Host Adapter entry. Click the Properties button. 7. Click on the Driver button. In Windows 95, the version of the currently active driver should display in the File details section. In Windows 98, press the DRIVER FILE DETAILS button to get this information to appear. Note: In certain versions of Windows 95, the version of the active driver appears as NOT available. This is an operating system issue and is fixed in later versions of Windows 95. To verify the version of the driver, click on the Properties field of the SYMC8XX.MPD, SYM_HI.MPD or SYM_U3.MPD file under the Version tab. The MPD driver is generally found in the \WINDOWS\SYSTEM\IOSUBSYS\ directory. 8. Click on the Change Driver... button. * * * * * For Windows 95 * * * * * 9. Even though you may have previously installed the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD drivers, proceed to click on the Have Disk... button to install a newer version. 10. Insert the Symbios Driver diskette in drive A: (or B:) (the one prepared in * Preparing a Symbios Driver Diskette *) and click OK. If using drive B:, you must select it from the pick list. The Select Device dialog box should display "Symbios xxx PCI SCSI Host Adapter," where xxx matches the installed adapter. 11. Click OK. The Driver tab is updated to display the new driver files. 12. Click OK to install these driver files. (Do NOT click on the Change Driver... button.) The driver files are copied, and a new driver database is built. * * * * * For Windows 98 * * * * * "Update Device Driver Wizard" starts and provides several windows with choices. Follow the steps below to correctly install the device driver for Windows 98. 9. After the Intro window appears, click on the NEXT button. The Wizard provides a choice between having the Wizard search for a better driver than the one in use or displays a list of drivers from a specific location. 10. Choose "search..." and click on the NEXT button. The next window allows the user to specify which device(s) will be searched, such as a floppy diskette, CD-ROM, or specify a specific path. 11. Select "Floppy disk drive" only and click on the NEXT button. The next window queries the user about utilizing the currently installed driver. 12. Mark "Install one of the other drivers" and click on the "View List" button. Next, a list of drivers appears from the specified search devices and the currently installed driver. 13. Highlight the driver of choice and click OK. The previous window appears with the selected driver displayed as the driver to install. 14. Click on the NEXT button. The next window displays the chosen driver along with reference to the designated path to install it in. 15. Click on the NEXT button. The Wizard summary window appears. 16. Click on the Finish button. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Upon completion of the installation for WIN95/98, the "System Settings Change" dialog box appears. Remove the diskette from the drive and click Yes to restart the computer. At this point, the new driver is operational. To ensure the correct driver has been installed, see the section "Verifying Correct Driver Installation." * * Existing System Using ASPI8XX.SYS DOS ASPI Driver * * This procedure installs the SYMC8XX.MPD, SYM_HI.MPD, and/or SYM_U3.MPD drivers onto an existing Windows 95/98 system which is using the ASPI8XX.SYS DOS ASPI driver. You can check this by using the Verifying Correct Driver Installation instructions below. 1. Boot Windows 95/98. 2. Click Start. Select Settings-->Control Panel. 3. Double click on the System icon. 4. Click on the Device Manager tab. 5. Either double click on the Other entry, or click once on the plus sign to the left of it. 6. Select the PCI SCSI Bus Controller entry. Click on the Properties button. 7. Click on the Driver button. A message should state that no drivers are installed for this device. 8. Click on the Change Driver... button. 9. Select SCSI Controllers in the Select Hardware Type dialog box, 10. Click on the Have Disk button in the Select Device dialog box, 11. Insert the Symbios Driver diskette in drive A: (or B:) (the one prepared in * Preparing a Symbios Driver Diskette *) and click OK. If using drive B:, you must select it from the pick list. 12. The Select Device dialog box should display "Symbios xxx PCI SCSI Host Adapter", where xxx matches the installed adapter. Click OK. The Driver tab is updated to display the new driver files. 13. Click OK to install these driver files. (Do NOT click the Change Driver... button.) The driver files are copied and a new driver database is built. The "System Settings Change" dialog box appears. Ignore the message saying to turn off your computer and change hardware settings. 14. Remove the diskette from the drive and click Yes to shut down the computer. 15. Press Ctrl-Alt-Delete or the system reset button to restart the system. At this point, the new driver is operational. To verify this, see the section "Verifying Correct Driver Installation" * * * * * * * Verifying Correct Driver Installation * * * * * * After installing/updating with the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD drivers, verify proper operation of the driver(s). 1. Check that all devices on the SCSI bus are available using My Computer. Double click on the My Computer icon. Check that all logical SCSI hard drives and CD-ROM drives are shown. 2. Click on the Start button. Select Settings-->Control Panel. 3. Double click on the System icon. 4. Click the Device Manager tab. Check that no host adapter appears with a yellow or red symbol under the SCSI controllers entry. If there is, continue with the steps below to help determine the problem. 5. Either double click on the SCSI controllers entry, or click once on the plus sign to the left of it. One entry for each host adapter installed in the system is displayed. 6. Select an entry, then click on the Properties button. The Device Status message should read "This device is working properly." If any other messages appear, continue with the steps below to get more information on the problem. 7. Click the Driver tab. For Windows 98, press Driver File Details. Two entries should appear: one for the INF and one for the MPD file. The INF file does not contain embedded version information, so the File Details are all Not Available. 8. Select the MPD file. The file version of the driver appears. 9. Click Cancel to leave the Host Adapter Properties dialog box. 10. Click on the Performance tab. A list of performance attributes appears. Below the list, you should see the message "Your system is configured for optimal performance." If any other messages appear, select each message and click on the Details button. This provides more information on why the system is not performing optimally and methods to correct the problem. If no problems are encountered in the above steps, the new driver is operating properly. Otherwise, consult the section on Troubleshooting for additional information. * * * * * * * * * * Troubleshooting * * * * * * * * * * * Some problems and their suggested solutions are: * * * Problem * * * During Installation, No SCSI Devices Are Found. * * * Solution * * * a. Ensure that all devices are powered on and terminated correctly. b. Check that no devices have duplicate SCSI IDs. c. Make sure INT A is assigned for the PCI slot(s) where your SCSI host adapter(s) are installed. d. Be sure that all devices appear properly in the display banner of the SDMS SCSI BIOS at boot time. * * * Problem * * * Problems With Ultra SCSI Devices Using Ultra SCSI Protocol. * * * Solution * * * a. If the system is configured with a Symbios host adapter that supports Ultra SCSI, an Ultra SCSI device is on the SCSI bus, and Ultra SCSI support by the SYMC8XX.MPD or SYM_HI.MPD driver is enabled, intermittent problems and possible system crashes can occur if the SCSI bus cable and terminators do not conform to the Ultra SCSI specification. b. If the system is bootable, disable Ultra SCSI support using the procedure described below. c. If the system is not bootable to Windows 95/98, hold down the F8 key when Starting Windows 95/98... appears on the screen. At the menu, select Safe Mode. Once the system is booted, disable Ultra SCSI support using the procedure described in the Command Line Options section titled "Enabling/ Disabling Ultra SCSI Support." d. If the system operates properly without Ultra SCSI enabled, it is highly likely that the SCSI bus cable and terminators are not configured correctly for Ultra SCSI. See the Symbios host adapter hardware manual for information on Ultra SCSI cabling requirements. e. Verify that the devices appear with the proper value for speed in the SDMS SCSI BIOS banner at boot time. Please see Chapter 2 "SCSI BIOS" in the Symbios PCI SCSI/Storage Device Management System SDMS 4.0 User's Guide for additional details. * * * Problem * * * Problems With Scanners. a. If a scanner is not operating properly (either the scanner is not found or a SCSI interface error occurs during scanning), it is possible that the third-party scanner drivers do not support the auto request sense feature of Symbios host adapters. Disable the auto request sense feature and try the scanner operation again. Use the procedure described in the Command Lines Options section titled "Disabling Auto Request Sense Support." * * * Problem * * * The system hangs at boot, has a long boot time, or SCSI device not available. Some older SCSI devices do not tolerate Domain Validation operations. At system boot time, Domain Validation is performed to test the data integrity of the SCSI bus between the host adapter and each target device. With some older SCSI devices, these operations can cause the device to stop responding to SCSI commands. * * * Solution * * * Disable Domain Validation support as described below, either for a specific problem SCSI target or all adapters controlled by the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD driver. Refer to the procedure in the Command Line Options section titled "Disabling Domain Validation Support. **************************** Command Line Options **************************** The command line options are described below. * * * * * * Enabling/Disabling Ultra SCSI Support * * * * Ultra SCSI support is controlled by settings in the adapter NVRAM. These settings can be viewed or changed using the SCSI BIOS Configuration Utility. During system boot, after the Symbios PCI BIOS banner, the message "Press Ctrl-C to start Configuration Utility" appears for a few seconds. Press Ctrl-C to start this utility. Select one of the adapters displayed, then "Device Selections". This shows the Sync Rate for each device and the selected adapter. To set a device to Ultra, the speed should be set to 20 Mbytes/s (for width of 8) or 40 Mbytes/s (for width of 16). To disable Ultra, the speed should be no higher than 10 Mbytes/s (for width of 8) or 20 Mbytes/s (for width of 16). If the speed of the adapter itself is changed, the speed for all devices will be set no higher than the adapter speed. * * * * * * * Disabling Auto Request Sense Support * * * * * * * When the SYMC8XX.MPD, SYM_HI.MPD and/or SYM_U3.MPD drivers are installed, support for auto request sense is enabled. Auto request sense is a feature of the adapter where certain device information is obtained automatically without system control, thereby increasing overall performance. However, some third-party peripheral drivers do not support the use of auto request sense, resulting in perceived device failures. Therefore, to allow these devices to operate properly, the auto request sense feature can be disabled using the Device Manager on a per adapter basis. Use this procedure for disabling auto request sense support: 1. Click on the Start button. Select Settings-->Control Panel. 2. Double click on the System icon. 3. Click on the Device Manager tab. 4. Either double click on the SCSI controllers entry, or click once on the plus sign to the left of it. One entry for each host adapter installed in the system appears. 5. Select the adapter desired, then click on the Properties button. 6. Click the Settings tab. 7. In the Adapter settings entry, type "DisableAutoReqSense=1;", without the quotes. If there is already an entry displayed, type the above at the end of the existing entry. Be sure to include the semicolon. 8. Click OK to exit the Settings tab. 9. Click OK again. If the entry was changed, the "System Settings Change" dialog box appears. 10 Click Yes to restart the computer. After the system reboots, auto request sense is disabled for the selected adapter. To re-enable auto request sense, delete the entry that was made above. If other entries exist, be sure to leave them intact. * * * * Disabling Domain Validation Support * * * * When the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD driver is installed, support for domain validation is enabled. Domain validation is a feature of the adapter where the data transfer speed between the adapter and each target is tested at system boot. If the test fails, the data transfer speed is reduced and the test repeated until a supported data transfer speed is found. However, some older SCSI devices do not properly support the standard SCSI commands used during this testing, resulting in the system not booting or a device not available. Therefore, to allow these devices to operate properly, the domain validation feature can be disabled using the Device Manager for all adapters controlled by the respective driver, or in the PCI SCSI BIOS Configuration Utility on a per device basis. Use this procedure for disabling domain validation support for all adapters controlled by the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD driver: 1. Click on the Start button. Select Settings-->Control Panel. 2. Double click on the System icon. 3. Click on the Device Manager tab. 4. Either double click on the SCSI controllers entry, or click once on the plus sign to the left of it. One entry for each host adapter installed in the system appears. 5. Select any adapter controlled by the desired driver, then click on the Properties button. 6. Click on the Settings tab. 7. In the Adapter settings entry, type "DisableDomainValidation=1;", without the quotes. If there is already an entry displayed, type the above at the end of the existing entry. Be sure to include the semicolon. 8. Click OK to exit from the Settings tab. 9. Click OK again. If the entry was changed, the "System Settings Change" dialog box appears. 10 Click Yes to restart the computer. After the system reboots, domain validation is disabled for adapters controlled by the selected driver. To re-enable domain validation, delete the entry that was made above. If other entries exist, be sure to leave them intact. Use this procedure for disabling domain validation support for a selected device, using the PCI SCSI BIOS Configuration Utility: 1. During system boot, after the Symbios PCI BIOS banner, the message "Press Ctrl-C to start Configuration Utility" appears for a few seconds. Press Ctrl-C to start this utility. 2. Select the desired adapter and press Enter, then choose "Device Selections", and press Enter. This shows the Sync Rate and Width for each device and the selected adapter. 3. To disable domain validation for a selected device, set the Sync Rate to 0 and Width to 0 for that device. This sets the device to asynchronous/narrow transfers and domain validation functions are not issued to this device. 4. Exit the SCSI BIOS Configuration Utility and save changes. * * * * * * * * * Enabling SCAM Support * * * * * * * * * SCAM (SCSI Configured AutoMatically) is a protocol that allows SCAM-compliant peripherals to assign their SCSI IDs dynamically at boot time, thus eliminating the need for the user to check and set unique SCSI IDs. This feature is disabled by default in the Symbios PCI BIOS (version 4.14 or earlier) and the SYMC8XX.MPD, SYM_HI.MPD, and SYM_U3.MPD drivers. Some legacy (non-SCAM) peripherals have problems with the SCAM protocol, resulting in the device either not being seen by the operating system, or not working correctly. However, if usage of the SCAM protocol is desired, there are two methods for enabling SCAM: Method 1 and Method 2. * * * Method 1 * * * Use this method when the adapter has NVRAM. During system boot, after the Symbios PCI BIOS banner, the message "Press Ctrl-C to start Configuration Utility" appears for a few seconds. Press Ctrl-C to start this utility. Select the desired adapter, then choose "Adapter Setup". On the Adapter Setup Menu, highlight "S-SCAM Support" and press Enter. Use the up/down arrows to select the ON setting, and press Enter. Exit from the menus and save the settings. This turns SCAM ON for both the PCI BIOS and the SYMC8XX.MPD, SYM_HI.MPD, or SYM_U3.MPD driver (whichever is controlling the selected adapter). To disable SCAM, repeat the above procedure to change the setting to OFF. * * * Method 2 * * * For adapters that do not have NVRAM, SCAM can be enabled within Windows 95/98: 1. Click on the Start button. Select Settings-->Control Panel. Double click on the System icon. Click on the Device Manager tab. 2. Either double click on the SCSI controllers entry, or click once on the plus sign to the left of it. One entry for each host adapter installed in the system is displayed. Select the adapter desired, then click on the Properties button. Click on the Settings tab. 3. In the Adapter settings entry, type in "do_SCAM=1;", without the quotes. If an entry is already displayed, type the above at the end of the existing entry. Be sure to include the semicolon. 4. Click OK to exit the Settings tab. 5. Click OK again. If the entry was changed, the "System Settings Change" dialog box appears. Click Yes to restart the computer. After the system reboots, SCAM is enabled for the selected adapter. To disable SCAM, delete the entry that was made above. If other entries exist, be sure to leave them intact. * * * * * * Multiple Symbios Host Adapter Considerations * * * * * * If multiple Symbios PCI SCSI host adapters are installed in the system, special actions are sometimes required to install or change drivers. This is due to the fact that some Symbios host adapters are supported by the bundled driver, and also that one Symbios driver can support multiple Symbios host adapters installed in the system. With multiple Symbios adapters, it is possible to have a situation where one adapter is assigned to one driver, and another adapter is assigned to a different version of the same driver. This can cause conflicts that may cause the system to switch to real mode drivers, affecting performance and access to CD-ROM or tape drives. When installing additional boards or updating drivers, two methods are available for ensuring that all Symbios host adapters are controlled by only one version of the appropriate driver. * * * Method 1 * * * Using the Device Manager, change the driver for a particular host adapter to the desired driver. When asked to reboot the system for the new settings to take effect, click No. Change drivers for all Symbios host adapters in the system supported by that same driver to the new driver, and reply No to rebooting until the final adapter is changed. If booting from a SCSI device, ensure that the adapter controlling this device is the last one changed. * * * Method 2 * * * Determine which driver file is active for all adapters through the Properties tab in Device Manager. Go to the \WINDOWS\SYSTEM\IOSUBSYS directory and rename the driver file to an extension other than MPD. Reboot the system. While booting, the system may ask to load the bundled driver file from the Windows 95/98 installation disk. Click OK. When the system says it cannot find the file, click Skip File. Do this for all adapter messages while booting. After the system is booted, use the Device Manager to change the driver for each adapter to the desired driver. Do NOT reply Yes to reboot the system until the final adapter has been changed.