1-32 Technical Information
DISKETTE DRIVE
The installed 1.44-MB, 3 1/2-inch diskette drive is directly connected to the system board
by a single ribbon cable with three connectors. Typically, there are no switches or jumpers
that need to be set, the diskette drive is terminated, and the cable determines drive A and B.
Connector locations are given in Appendix A. Diskette drive specifications are given in
Table 1-23.
HARD DISK DRIVE
All systems ship with one internal 3 1/2-inch hard disk drive (1-inch high, thin-height)
installed in the lower drive bay slot inside the system. Systems are configured with a
6.4- or 8.4-GB IDE model or a 4.5- or 9.1-GB UW SCSI model.
Use the “Storage Device Installation” procedures in Section 3 when installing optional
devices. Connector locations are given in Appendix A. Jumper settings are given in
Appendix B. Hard disk drive specifications are given in Table 1-24 through Table 1-30.
IDE Support
In systems with an IDE hard disk drive, a three-connector hard disk drive IDE cable
connects to the IDE hard disk drive and the primary connector on the system board. The
system board has two IDE/PCI interface connectors (primary and secondary) for connecting
IDE storage devices. Each connector supports up to two IDE devices. These interfaces
support PIO Mode 3, PIO Mode 4, ATAPI devices (for example, CD-ROM), and Ultra
DMA synchronous-DMA mode transfers. The BIOS supports logical block addressing
(LBA) and extended cylinder head sector (ECHS) translation modes. The BIOS
automatically detects the IDE device transfer rate and translation mode.
An optional second IDE hard disk drive can be added to the primary channel. If the second
hard disk drive is installed, it connects to the middle connector on the IDE cable.
SCSI Subsystem
The onboard SCSI subsystem features the Adaptec AIC-7895CP, which contains a dual-
channel SCSI controller and a PCI bus master interface. The AIC-7895CP supports the
following features:
Dual SCSI channels (channel A and channel B)
Narrow (8-bit, 50-pin) or Wide (16-bit, 68-pin) Fast SCSI providing
10-20 MB/sec throughput per channel
Narrow (8-bit, 50-pin) or Wide (16-bit, 68-pin) Ultra SCSI providing
20-40 MB/sec throughput per channel
Burst data transfers on the PCI bus up to the maximum rate of 133 MB/sec per
channel using the on-chip 256-byte FIFO buffer