8.Turn the subassembly over and put it down with the disk drive(s) facing up.

Hard disk drive

Floppy disk drive

vAbout NuBus slots and cards: The two NuBus slots in the Duo Dock are stacked vertically. The slots are identical, so you can install your card in either one. If you install your card in the upper slot (which is the lower slot when the dock is right side up), you’ll have to remove it and reinstall it if you want to add a second card later.

NuBus cards come in different shapes and sizes. All properly designed cards will fit into the Duo Dock. You may find it easier to install a large card in the upper slot rather than the lower one. v

9.Remove the plastic NuBus card guide next to the floppy disk drive by pulling it straight out.

NuBus card guide

232 Chapter 13: Building a PowerBook Duo System

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Apple Duo 270C manual Hard disk drive Floppy disk drive, NuBus card guide Building a PowerBook Duo System