Compaq Armada 4100 Reference Manual page 88

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5. Turn the computer over, right side up.
6. Tilt the computer at an angle to line up the two notches on the
computer
7. Lower the computer o onto the MCD. Be sure that the expansion
connector slot on the bottom of the computer is aligned with the
connector posts on top of the MCD.
Attaching the Computer to the MCD
with the guide hooks on the right side of the MCD.
Maximizing Your Portable Expansion Unit 7-5