NEC PowerMate V486 Series Manual page 174

4. If you are installing a device in the lower 5 1/4-inch
device slot, prepare the slot as follows:
Release the front panel by removing five screws from
the back of the front panel.
If you are installing an accessible device, such as a
diskette drive or CD-ROM reader, locate the blank
panel in the front panel for the device slot.
5-58 Adding Options
Preparing the device slot