37
Enabling Bus Mastering for IDE/ATAPI Devices
Your system may have shipped with bus mastering for IDE/ATAPI devices enabled. If you
reinstall Windows NT 4.0 and Service Pack 3 software, you may want to re-enable IDE/ATAPI
bus mastering.
NOTE
On systems that ship with a TR-4 tape drive, a Zip drive, or a CD-Recorder drive, bus mastering
is not enabled. See documentation delivered with these devices for more information.
To enable IDE/ATAPI bus mastering:
1.
Ensure that the operating system, Service Pack 3 software, and QFE update software
(
QFE
_
NT
*) are installed.
NOTE
The QFE update software includes an updated ATAPI device driver that should be installed after
Service Pack 3.
NOTE
For reasons of system performance, if a TR-4i tape drive or a Zip drive is installed, do not
enable DMA use on the IDE channel to which the drive is connected. A TR-4i tape drive or Zip
drive is usually connected to Channel 0 when installed at the factory.
2.
Insert the Windows NT 4.0 Service Pack 3 CD-ROM into your system’s CD-ROM drive.
3.
In Explorer or File Manager, navigate to the \
SUPPORT
\
UTILS
\
I
386 directory.
4.
Double-click
DMACHECK
.
EXE
. The ATAPI DMA support dialog displays.
5.
The Current DMA Usage boxes indicate which channels have IDE/ATAPI devices. For
each channel with an IDE/ATAPI device, click Enabled; then click OK.
6.
Restart the system.
Windows 95 and Windows 98
Depending on your system’s configuration, you will need some or all of the following system
software during the installation process:
u
Windows 95 Operating System Service Release 2.5 or Windows 98
u
PIIX4 IDE patch (Windows 95 only)
u
Video display adapter driver
u
Network adapter driver
u
Audio card driver
u
Mouse driver
u
SCSI adapter driver
u
QFE update software
