Dell Vostro 400, Service Manual, Page: 19 / 118

System Overview 1-7
NOTE: For systems running the Microsoft Windows
®
95 operating system,
the functions provided by the ICU are handled by the Device Manager, which
can be accessed by double-clicking the System icon in the Control Panel.
Windows 95 documentation provides instructions on using the Device Manager
to manage resources and resolve conflicts.
After all legacy cards have been configured by the operating system or with the
ICU, the computer automatically assigns any required memory space, IRQ
lines, and DMA channels to any installed Plug and Play ISA expansion cards
and PCI expansion cards the next time the computer is rebooted. Chapter 4,
“Using the ISA Configuration Utility,” in the User’s Guide describes the ICU
and provides instructions for using it to configure the computer.
The five expansion slots include two ISA expansion-card connectors and five
PCI expansion-card connectors. (The two ISA expansion-card connectors share
expansion slot space with two of the PCI expansion-card connectors, resulting
in a total of five expansion slots.) The expansion-card connectors are located on
a riser board (see Figure 1-5).
Figure 1-5. Riser-Board Expansion-Card Connectors
Hard-Disk Drive Options
The hard-disk drive bracket is located next to the drive bays at the front of the
computer. The computer can contain up to two 1-inch-high hard-disk drives or
one 1.6-inch-high hard-disk drive and one 1-inch-high hard-disk drive. The
mini tower chassis also supports the installation of a third SCSI hard-disk drive
in its own drive bracket.
NOTE: SCSI devices require a SCSI host adapter card. Installing a third wide
SCSI hard-disk drive requires a three-connector 68-pin SCSI cable, which is
provided with the upgrade kit. For detailed information about installing SCSI
devices, see Chapter 9, “Installing Drives,” in the User’s Guide.
ISA2
ISA1
PCI5
PCI1
JHDLED connector