IBM Aptiva Handbook page 77

To upgrade your computer's hardware, you can add or
replace cards, drives, or some system board components. If
you take the time to evaluate your new hardware and plan
your hardware changes, you can reduce the effort required
to make the changes.
For instance, the type of hardware you plan to add or
replace determines whether you begin with your computer
turned on or off.
As you prepare to add or replace hardware in your system
unit, follow the instructions in these sections:
W "Evaluating your new hardware" on page 7-1
W "Planning your hardware changes" on page 7-3
W "Resolving resource conflicts" on page 7-3
W "Opening the system unit" on page 7-4
W "Looking inside the system unit" on page 7-6
The documentation that came with your new hardware
should contain information about required settings and the
instructions on how to install the hardware. Study the
documentation carefully.
If the documentation refers you to information about your
computer's I/O addresses, system interrupt requests (IRQs),
or DMA channel assignments, see "Appendix A:
Specification tables".
7-1