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Youll 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 youve backed up your registry before proceeding.
II-43 You just applied the Windows NT 4.0 upgrade and now your audio doesnt 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 dont 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.
II-45 You upgraded to HP DeskScan II 2.3 from version 2.1 or older, and the program doesnt 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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