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3.0
Hardware Installation Instructions
This section briefly describes installation of the WDl007A-WA2. If you wish to install
the disk drive internally, it is best to locate the controller in the closest available
expansion slot relative to the drive. The WDl007A controller can be installed in any 16-
bit slot in the IBM PC-AT or compatible host computer. Connecting cables for the ESDI
hard disk are the same as those used on ST506 type drives. Device ID jumpers are
implemented on the ESDI device just as with an ST506 drive. Verify that the drive is
configured to support the hard sector mode.
CAUTION
Handle the controller board by the ends of the board. Some of the chips are static
sensitive and damage may occur if the board is incorrectly handled.
1. Verify the controller jumper settings. Modification of the standard factor settings on
the controller is rarely necessary. Modify the jumpers only under the direction of a
qualified individual; i.e., your dealer. Figure 1 illustrates the jumper locations. Table 1
lists the jumper default settings for the WDl007A-WA2 and the WDl007A-WAH.
Table 2 provides the various address select ranges and corresponding jumper settings.
The WDlOO7A-WAH can be used as a field replacement
board
for
existing
WD1005WAH boards without reformatting the hard disk drive. The WDl005WAH
firmware does not recognize the Set Unformatted Bytes per Sector command, so you
must set jumper/switches on the drive to the desired sectors per track. Substituting the
WD1007A-WAH board and installing a jumper at W8 precludes the use of the Set
Unformatted Bytes/Sector command. When in the WDl007A-WA2 mode (no jumper on
W8), the ESDI drive is forced to 35 sectors per track by the Set Unformatted Bytes per
Sector command. The interleave ratio is 1:1.
2. Remove or disable any other floppy controller in your system if you are installing the
WDl007A-WA2.
3. Verify termination of the last hard disk drive. Verify proper setting of drive select
switches on the drive, if necessary. Do NOT use the drive's radial select option. Refer to
the drive owner's manual for information about proper drive termination and select
switches.
4. Remove the blank expansion slot bracket. Put the bracket away and save it for
possible future use. The bracket screw will be used to hold the controller board in place.
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