Acer V56LA User Manual page 4

1.1.2 Slot Boards
The system board comes with a slot board already installed. The slot
board carries the PCI and ISA bus slots for system enhancements and
future expansion.
The slot board may vary in size and layout depending on your system
housing. Figures 1-2 to 1-6 show the slot board types.
Figure 1-2 2-PCI/3-ISA Slot Board (for desktop systems)
Figure 1-3 3-PCI/4-ISA Slot Board (for minitower systems)
1-4 User's Guide