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Miniport Options

Additional Notes

  • If disconnection is disabled under SCSISelect for a hard disk device, the system may hang if the hard disk device supports tagged queuing. It is recommended to always enable disconnection for hard disk devices. By default, disconnection is enabled so no action is required. If for some unique requirements disconnection has to be absolutely disabled for hard disk devices, you can turn off tagged queue requests by editing the Windows NT Registry. You can do so by following these instructions:
    1. Select Run from the File pull-down menu (Windows NT 3.5x), or Run from the Start button (Windows NT 4.0).
    2. Enter REGEDT32 to run the Registry Editor. 
    3. 
		  For non-Ultra2 host adapters open:

		  \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aic78xx

		  For Ultra2 host adapters open:

		  \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aic78u2
    4. Create a key named Parameters by selecting Add Key from the Edit pull-down menu and entering "Parameters" (without quotations) in the edit-box for Key Name. Leave the Class edit-box blank.
    5. Open Parameters and create a key named Device by selecting Add Key from the Edit pull-down menu. Enter "Device" (without quotations) in the Key Name edit-box. Leave the Class edit-box blank.
    6. Open Device. Select the Add Value option from the Edit pull-down menu. In the Value Name edit-box, enter "DisableTaggedQueuing" (without quotations). Select the Data Type REG_SZ from the droplist combo box.
    7. Shutdown and restart Windows NT.
    8. Set Enable Disconnection to No for your particular device(s) in SCSISelect during bootup. (See your Host Adapter manual on how to use SCSISelect).
  • If the logical driver letters assigned by the BIOS change when the NT operating system is running, it's not an error. To preserve drive letter assignments between BIOS and NT, run the NT disk administrator and choose permanent letters assignments as an option. NT will then preserve logical driver letter assignments across boots and adapters.
  • The boot manager for Windows NT contains recovery logic to allow you to return to the last known good configuration. If you have changed your host adapter configuration and Windows NT no longer boots, follow these steps to recover:
    1. Undo any hardware changes you have made to the computer since it was last operational.
    2. Reboot the computer. Watch the display carefully during bootup. If the following message appears, press the Spacebar.
      
		  Press spacebar NOW to invoke the Last Known Good menu
      Follow the instructions on the screen to continue booting with the last known good configuration. For Windows NT 4.0 only, hit the letter "L", to switch to the last known good configuration.
    3. Once your computer is operational again, check all of the hardware and software configuration changes you want to make. Look specifically for conflicts with parts of the existing system configuration that are not being changed.


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