Installation Guide AHA-3940AUWD MultiChannel PCI-to-UltraSCSI Host Adapter with SCSISelect Utility R
1 Getting Started This Installation Guide tells you how to install and configure the AHA®-3940AUWD PCI-to-UltraSCSI host adapter. The host adapter has two SCSI channels which operate like two independent host adapters using the AIC-7895. The AHA-3940AUWD host adapter is designed for computers with 5-volt or 3.3-volt PCI slots. PCI is a local bus interface that enables highspeed data transfer. The computer in which you install the host adapter must be compliant with PCI 2.0 or higher.
Location Description J1 Internal 68 pin SCSI connector, Channel A J2 Internal 68 pin SCSI connector, Channel B J3 External LED connector J4 External 68 pin SCSI connector, Channel B1 J5 Internal 50pin SCSI connector, Channel A J6 J7 Multiple computer termination jumper, Channel B2 Multiple computer termination jumper, Channel A2 J8 External 68 pin SCSI connector, Channel A1 1 68-pin connector, very high density (0.8 mm) 2 See Termination in Multiple Computer Configurations on page 7.
3 Default Settings AHA-3940AUWD host adapters operate correctly with their factory default settings in most computers with PCI slots. The following table lists the settings and their default values. You can change these settings with the SCSISelect utility. (See Configuring the Host Adapter on page 9.
4 Installing the Host Adapter Inserting the Host Adapter in a PCI Slot WARNING: Turn OFF and disconnect the power to your computer and attached devices before you remove the cover of the computer. 1 Remove the cover from the computer case. 2 Locate an unused 5-volt or 3.3-volt PCI expansion slot that supports bus mastering. Make sure this slot is not obstructed by other system hardware. PCI bus slots are usually white or ivory and are shorter than ISA or EISA slots. Usually there are three PCI slots.
5 Connecting SCSI Devices Caution: AHA-3940AUWD host adapters support only single-ended SCSI devices. Do not connect differential SCSI devices, because they may damage the host adapter. Read the SCSI device documentation to determine if the device is single-ended or differential. Connecting SCSI Cables SCSI devices are cabled together in a single, connected series called the SCSI bus. 1 Lay out the cables and find the pin-1 element of each cable and device connector.
Caution: Channel A has three SCSI connectors: J1, J5, and J8. Do not connect devices to all three connectors at one time. At most, only two of the three channel A connectors can be used at the same time. Terminating the SCSI Bus The last physical SCSI device on each end of the SCSI bus must be terminated. Termination must be disabled on all other devices in the middle of the SCSI bus. You may need to change the termination setting on some devices in your computer system.
same SCSI bus accesses the disk drives and other SCSI devices on the bus. Setting SCSI IDs You must assign a different SCSI ID to each device on each of the SCSI buses connected to the AHA-3940AUWD host adapter. See your SCSI device documentation to learn how to determine the ID and change it. ■ ID 7 is the default SCSI ID for the host adapter on both SCSI Channels A and B. You can change the ID(s) in SCSISelect, if necessary. See Configuring the Host Adapter on page 9.
Note: The PCI bus is supposed to automatically assign Interrupt channels (IRQs) and port addresses. But because PCI is currently combined with other bus architectures such as ISA and EISA, you may need to edit the PCI bus parameters in your CMOS Setup. When the computer boots, the host adapter BIOS sign-on message appears on the screen. This message includes a list of installed SCSI devices and information about the BIOS.
and Advanced Configuration Options. Highlight an option and press Enter to see a list of possible values. Select SCSI Device Configuration to see a menu of the following options for each device on the SCSI bus: Initiate Sync Negotiation, Maximum Sync Transfer Rate, Enable Disconnection, Initiate Wide Negotiaton, Send Start Unit Command, BIOS Multiple LUN Support, and Include in BIOS Scan. These settings apply to individual SCSI devices.
Options, and set the Support Removable Disks Under BIOS as Fixed Disks option to All Disks. Caution: If you use this setting, you cannot remove media while your computer is ON. You need additional software if you want to do the following (contact Adaptec for additional drivers): ■ Use devices other than hard disk drives, such as SCSI tape drives, CD-ROM drives, scanners, etc.
■ Are all devices on the SCSI bus terminated properly? ■ Does your system CMOS Setup require you to enable PCI bus parameters? If so, see your computer documentation. Confirm the IRQ channel assignment. ■ Is the host adapter installed in a PCI slot that supports bus mastering? Refer to your computer documentation or move the host adapter to a different PCI slot.
Federal Communications Commission Radio Frequency Interference Statement WARNING: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Adaptec, Inc. 691 South Milpitas Blvd. Milpitas, CA 95035 Copyright © 1997, Adaptec, Inc. All rights reserved. Adaptec, the Adaptec logo, AHA, and EZ-SCSI are trademarks of Adaptec, Inc. which may be registered in some jurisdictions. Windows NT is a trademark, and Windows and Windows 95 are registered trademarks of Microsoft Corporation used under license. All other trademarks used are owned by their respective owners. Printed in Singapore Stock No.: 511396-00, Rev. A MR 3/97 Micronics Computers Inc.
