Introduction The Adaptec AHA®-2940Ultra and AHA-2940Ultra Wide PCI-to-Fast SCSI host adapters provide a powerful multitasking interface between your computer’s PCI bus and SCSI devices (disk drives, CD-ROM drives, scanners, tape backups, removable media drives, etc.). Collectively, both host adapters are referred to as the AHA-2940Ultra/2940Ultra Wide. The following figures show the major components on the AHA-2940Ultra and AHA-2940Ultra Wide.
Installing the Host Adapter Follow these instructions to install the host adapter: 1 Turn OFF power to the computer and peripheral devices and disconnect the power cords. 2 Remove the cover from the computer case. 3 Locate an unused 32-bit PCI expansion slot (the slot must support Bus Master data transfers); unscrew and remove the metal bracket that covers the card-slot opening. (Save the screw to use when securing the host adapter in your computer.
your hard disk and other SCSI devices, refer to the device’s documentation. The host adapter supports the SCSI Configured AutoMatically (SCAM) protocol, which assigns SCSI IDs dynamically and resolves SCSI ID conflicts automatically at bootup. If your system includes SCSI disk drives or other devices that support SCAM, you do not need to manually assign SCSI IDs to these devices. To enable SCAM support, see Configuring the Host Adapter on page 7.
■ If the AHA-2940Ultra detects that a cable is connected to both its internal and external SCSI connector, then it disables its terminators (the AHA-2940Ultra lies between the ends of the SCSI bus). We recommend that you leave the AHA-2940Ultra set to its default setting of Automatic. If you want to manually enable or disable the AHA-2940Ultra termination setting, see Configuring the Host Adapter on page 7.
4 Installing SCSI Devices You can connect up to a total of seven internal and external 8-bit SCSI devices to the AHA-2940Ultra, and up to 15 devices (seven 8-bit internal and eight Wide (16-bit) internal or external SCSI devices, or 15 Wide internal and external SCSI devices) to the AHA-2940Ultra Wide. Note: You may only use two of the three connectors at any one time on the AHA-2940Ultra Wide host adapter.
external) must not exceed 3 meters (9.8 ft.) to ensure reliable operation. If no Fast SCSI devices are connected, the total length of all cables must not exceed 6 meters (19.7 ft). See your device’s documentation to determine if it is a Fast SCSI device. Connecting Internal SCSI Devices If you are connecting internal SCSI devices, make sure you have an internal SCSI cable with enough connectors to accommodate all of your devices.
Connecting External SCSI Devices If you are connecting external SCSI devices to your host adapter, you must obtain an external SCSI cable for each external device you install. 1 Prepare each SCSI device for installation; configure the SCSI ID and attach a terminating plug into the last external device. For instructions, see the device’s documentation as well as SCSI Configuration Guidelines on page 2.
board. SCSISelect also contains SCSI disk utilities that let you low-level format or verify the disk media of your SCSI hard disk drives. SCSISelect Default Settings The AHA-2940Ultra/2940Ultra Wide has the default settings shown in the table on the following page. The default settings are appropriate for most PCI systems. If you do not need to change any of the default settings, there is no need to run SCSISelect.
Support Removable Disks Under BIOS as Fixed Disks4 Display Message During BIOS Initialization4 BIOS Support for Bootable CD-ROMs4 BIOS Support for Int13 Extensions4 Boot only Enabled Enabled Enabled 1 Setting is valid only if Multiple LUN Support is enabled 2 For AHA-2940Ultra only 3 For AHA-2940Ultra Wide only 4 Settings are valid only if host adapter BIOS is enabled Starting the SCSISelect Utility You can start the SCSISelect utility by pressing Ctrl-A when the following prompt appears at boo
immediately scans the SCSI bus and displays a list of all SCSI IDs and the devices assigned to each ID. When you select a specific ID and device, a small menu appears, displaying the options Format Disk and Verify Disk Media. ■ Format Disk—This utility allows you to perform a low-level format on a hard disk drive. Most SCSI disk devices are preformatted at the factory and do not need to be formatted again. The Adaptec Format Disk utility is compatible with the vast majority of SCSI disk drives.
■ Adaptec 7800 Family Manager Set—allows you to install software drivers for NetWare, OS/2, Windows 95/98, Windows NT, and UNIX. Refer to the 7800 Family Manager Set User’s Guide. Contact Adaptec if you need to order EZ-SCSI or the 7800 Family Manager Set. 9 Troubleshooting Checklist If you have a problem during installation, check these items first: ■ Have you installed the host adapter into a PCI Rev 2.
2 Make sure the boot hard disk SCSI ID corresponds to the Boot Target ID setting in SCSISelect (see page 8). The SCSI ID is normally set with jumpers or switches on the drive. 3 If this does not solve the problem, back up all data on the SCSI hard disk and perform a low-level format with the SCSISelect Format Disk option. See the MS-DOS documentation for instructions on partitioning the disk after formatting.
FCC Compliance Statement 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 residential installations. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
Installation Guide AHA-2940Ultra/ 2940Ultra Wide PCI-to-UltraSCSI Host Adapter with SCSISelect / Edition 2.
