User's Guide

System Cabling A-3
Standard Configuration
Your system is cabled using a single channel on-board IDE Controller and dual channel
on-board Adaptec 7899 SCSI Controller.
The on-board IDE controller supports the standard internally mounted CD-ROM as its
master device. If only one device is on a channel connector it must be set as the master
device.
The AIC7899 contains two independent SCSI channels that share a single PCI bus
master interface. Each channel is capable of operations using either 8- or 16-bit SCSI
providing 160 MB/s (Ultra-160/M) or 40 MB/s (Wide Ultra) throughput. Channel A
attaches to an Ultra-160/M SCSI backplane that supports up to five 160/M SCA drives.
Controller B can be used to support SCSI devices in the removable media bay. An
optional 68 pin to 50 pin converter is also available to be used when installing SCSI
narrow devices.
A 3.5-inch diskette drive (Figure A-1, L) is installed in all systems and interfaces
separately to the system board.
Figure A-1 illustrates the standard system configuration. This system includes five hot-
swap hard disk drive bays. Referring to the Figure A-1, a 68-pin Ultra-160/M SCSI
interface cable (D) is connected to the SCSI connector (E) on the system board. This
cable connects to the rear of the hard disk drive's SCSI backplane (A). Depending on
your system configuration up to a maximum of five hot-swappable hard disk drives
may be connected to the SCSI backplane.
The IDE interface cable (H) is connected to the IDE connector (G) towards the middle
of the system board. This cable connects to the rear of the internally mounted CD-ROM
drive (I).