IBM NetVista A20 User Manual page 68

Expansion slots. There are three expansion slots on the system board
1
for the installation of adapter cards that conform to Peripheral Component
Interconnect (PCI) specifications. These cards are commonly referred to
as PCI adapter cards.
2
System board.
3
Bay 3. This drive bay can accommodate a 3.5-inch slim IDE hard disk. In
many models, this bay holds a factory-installed hard disk drive.
4
Switching power supply. The system comes with a switching power
supply
5
Bay 2. This drive bay can accommodate a 5.25-inch device, such as a
5.25-inch diskette drive, CD-ROM drive, or DVD-ROM drive. You can also
install a 3.5-inch to 5.25-inch installation kit.
6
Bay 1. This drive bay can accommodate a 5.25-inch half-high drive such
as a diskette, hard disk, tape, or CD-ROM. In many models, this bay holds
a factory-installed CD-ROM drive.
5-12 IBM Personal Computer User Guide