1001 Secrets for Windows NT Registry
(Publisher: 29th Street Press)
Author(s): Tim Daniels
ISBN: 1882419685
Publication Date: 12/01/97

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You’ll need the value from the new SCSI controller and from the original controller. If you swap these values, your system should boot from the original controller.

II-41 If you use the Sparrow.sys driver for your SCSI adapter, you may have noticed that by default it is assigned IRQ 11 and this assignment seems to be hardcoded. Do not despair. This registry entry lets you override the hardcoded IRQ 11 and change it to anything you want.

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\Sparrow

Add the following key under the Sparrow key.

Key: Parameters

Now that you have the Parameters key, you need to add another subkey: Device(n). The n is the device number you are changing the IRQ for. If you only have one adapter, it is Device0.

Key: Device0

Next, you need to add the actual value that lets you change the IRQ settings:

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services\Sparrow\Parameters\ Device0
Value Name: DriverParameter
Data Type: REG_SZ
Value: IRQ=12 (or any other valid IRQ setting)

You must reboot the machine for this change to take effect.

II-42 To increase the throughput of your SCSI adapter, try changing this registry entry.

Hive: HKEY_LOCAL_MACHINE
Key: CurrentControlSet\Services\aic78xx

Add the following key under the aic78xx key:

Key: Parameters

Now add an additional subkey:

Key: Device

Now we are ready to change the value that improves throughput.

Hive: HKEY_LOCAL_MACHINE
Key: CurrentControlSet\Services\aic78xx\Parameters\Device
Value Name: MaximumSGList
Data Type: REG_DWORD
Value: 0xFF

This change works with Adaptec cards and may work with other SCSI adapters, too. As always, make sure you’ve backed up your registry before proceeding.

Sound

II-43 You just applied the Windows NT 4.0 upgrade and now your audio doesn’t work. Try this registry modification to fix it.

Hive: HKEY_CURRENT_USER
Key: Control Panel\Sound

Make sure the following value exists.

Value Name: Beep
Data Type: REG_SZ
Value: yes

Reboot the system for these changes to take effect

II-44 Your sound card locks up any time you play a .wav file. The only solution is to restart the computer. Try this registry parameter to help solve the problem.

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Control\GraphicsDrivers

Add the following key under the GraphicsDrivers Key:

Key: DisableUSWC

You don’t need to specify anything else. By adding this key, you tell Windows NT not to use Uncache Speculative Write Combining on the video cards. Reboot the machine for this change to take effect.

HP DeskScan II 2.3

II-45 You upgraded to HP DeskScan II 2.3 from version 2.1 or older, and the program doesn’t run. Changing the following registry entries should solve your problem.

Hive: HKEY_LOCAL_MACHINE
Key: System\CurrentControlSet\Services

Add the following Key and the next two values:

Key: Aspi32
Value Name: ErrorControl
Data Type: REG_DWORD
Value: 1

Value Name: Start
Data Type REG_DWORD
Value: 2

Value Name: Type
Data Type: REG_DWORD
Value: 1

II-46 This entry is the second part of installing the new DeskScan II 2.3 software.

Hive: HKEY_CURRENT_USER
Key: Control Panel\Mmcpl

Add the following value under the Mmcpl key:

Value Name: HP_Scanjet
Data Type: REG_SZ
Value: %systemroot%\system\hpscnmgr.dll

Reboot your system for these changes to take effect. Windows NT now runs the correct driver.


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