Applied Engineering Sirius IIGS User Manual page 17

Squeeze the left and right side of the plug to release, then pull
up.
iii)
Turn the computer on its left side. On the bottom of the
computer you will find four screws in a rectangular pattern the
size of the power supply. While firmly holding onto the power
supply, remove the four screws. When all four are removed, lift
the power supply out of the case.
4 ) Remove Vulcan from Packing.
5 ) Check Voltage Setting
The switch setting on back of the Vulcan must be set to the
proper voltage (115 in the United States).
6 ) ][ Plus Users Only -- Attach Riser Plates
The two metal plates (included) must be attached to raise the
Vulcan over the ] [ Plus motherboard. Use four of the included
Phillips screws to attach the plates.
* Note: Attach the plate so that the screws are to the side
of the female stand-offs toward the long straight edge of
the Vulcan (see picture following).
10 Vulcan
Unplug Internal Cord
Remove screws.