AHA-2740W/2742W Single-ended AHA-2744W Differential ▼ ▼ ▼ ▼ EISA-to-Fast/Wide SCSI Host Adapters Installation Guide R AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AHA-2740W/2742W/2744W AA AA AA AA Stock Number: 511052-00, Rev.
Copyright Copyright © 1996 Adaptec, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means; electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Adaptec, Inc., 691 South Milpitas Blvd., Milpitas, CA 95035. Trademarks Adaptec, the Adaptec logo, AHA, and EZ-SCSI are trademarks of Adaptec, Inc. which may be registered in some jurisdictions.
Adaptec Technical Support and Services If you have questions about installing or using your Adaptec product, check this document first—you will find answers to most of your questions here. If you need further assistance, please contact us.
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.
▼ ▼ ▼ ▼ Contents Getting Started 1 Board Layout AHA-2740W and 2742W 2 Board Layout AHA-2744W 3 Default Settings 4 The Onboard Floppy Controller (AHA-2742W and AHA-2744W Only) 4 Installing the Host Adapter 5 Cabling the Host Adapter 5 Connecting Internal SCSI Devices 6 Maintaining Pin-1 Orientation 7 Connecting External SCSI Devices 7 Connecting Floppy Drives (AHA-2742W and AHA-2744W Only) 8 Terminating the SCSI Bus 8 Configuring Host Adapter Termination 9 Setting the SCSI ID 11 Configuring the Host Adapte
AHA-2740W/2742W/2744W Support Removable Disks as Fixed Disk 15 Extended Translation for Drives > 1 GByte 15 Support for More than Two Drives 15 Support for Bootable CD-ROM 16 Support for Int 13h Extensions 16 SCSI Device Configuration 16 Enable Disconnection 16 Initiate Sync Negotiation 16 Maximum Sync Xfer Rate 16 Initiate Wide Negotiation 16 Include in BIOS Scan 17 Error if Device Not Found 17 Send Start Unit Command 17 Utilities 17 Operating System Support 17 DOS/Windows 17 Adaptec EZ-SCSI“ Software 18
Getting Started Getting Started This document provides the steps required for installation of the AHA-2740W and AHA-2742W single-ended, and the AHA-2744W differential Fast/Wide SCSI Host Adapters. The AHA-2740W and AHA-2742W support single-ended SCSI, while the AHA-2744W supports differential SCSI. In this document, the AHA-2740W, AHA-2742W, and AHA-2744W are referred to jointly as the AHA-2740W/2742W/2744W. Procedures for all three adapters are similar.
AHA-2740W/2742W/2744W Board Layout AHA-2740W and 2742W Figure 1 shows the location of the major components on the AHA-2740W and AHA-2742W host adapters; Table 1 describes each major component of the AHA-2740W and AHA-2742W. J1 J2 J3 PIN 1 J4 J5 PIN 1 J6 Figure 1. Board Layout for the AHA-2740W and AHA-2742W Table 1.
Board Layout AHA-2744W Board Layout AHA-2744W Figure 2 shows the location of the major components on the AHA-2744W host adapter; Table 2 describes each major component of the AHA-2744W. J1 J2 J3 Pin 1 J4 J5 Pin 1 J6 Figure 2. Board Layout for the AHA-2744W Table 2.
AHA-2740W/2742W/2744W Default Settings Your host adapter is already configured for the majority of EISA class computers. Table 3 lists the default settings of your host adapter. Refer to Configuring the Host Adapter for information on changing any of these settings. Table 3.
Installing the Host Adapter Installing the Host Adapter Always refer to your system’s documentation for instructions on removing the system cover and adding option boards. Caution: Turn OFF and disconnect power to the system and external equipment. To install the AHA-2740W/2742W/2744W in your EISA computer system, complete the following: 1 Remove the cover of your EISA personal computer to expose the EISA bus slots on the motherboard.
AHA-2740W/2742W/2744W Only 8-bit internal SCSI devices can be connected to the 50-pin internal connector. The 68-pin internal and external connector normally accepts 16-bit Wide SCSI devices; however, 8-bit SCSI devices can be connected if they are equipped with 68-pin connectors. The AHA-2740W/2742W/2744W can accommodate a single SCSI bus with up to a total of 15 SCSI devices connected.
Cabling the Host Adapter Maintaining Pin-1 Orientation When connecting the 50-pin internal SCSI ribbon cables to both the host adapter and internal SCSI device(s), make sure that pin-1 orientation is maintained throughout the bus. Pin-1 of the SCSI ribbon cable is designated by a colored stripe on one edge of the ribbon cable. Pin 1 of the host adapter or SCSI device connector is usually designated by an arrow or delta symbol (▲) on the connector.
AHA-2740W/2742W/2744W Connecting Floppy Drives (AHA-2742W and AHA-2744W Only) Floppy disk drives are connected to the host adapter by a 34-pin floppy ribbon cable with a 34-pin header connector. Up to two floppy diskette drives can be connected to the host adapter. When connecting your floppy drives, make sure to maintain pin-1 orientation as previously described in Cabling the Host Adapter on page 5.
Terminating the SCSI Bus Configuring Host Adapter Termination For the AHA-2740W and AHA-2742W, host adapter termination is determined by the devices connected to the host adapter, is software selectable only, and is controlled through your computer’s EISA configuration utility. Table 4 describes the possible configurations for host adapter termination. Table 4.
AHA-2740W/2742W/2744W Table 5. Termination Configuration for the AHA-2744W Low High Install1 Remove OFF OFF None From RN1 to RN12 ON ON RN1, RN2, RN9, None RN10, RN11, and RN12 with 10-pin 330 ohm bussed RNs. RN3, RN4, RN5, RN6, RN7, and RN8 with 10-pin 150 ohm isolated RNs. OFF 1 ON RN9 and RN12 with RN1, RN2, RN4, 330 ohm bussed RNs. RN5, RN7, RN8, RN10, and RN11 RN3 and RN6 with 150 ohm isolated RNs. RN1, RN2, RN9, RN10, RN11, and RN12 are 330 ohm resistor networks.
Setting the SCSI ID Note: When reinstalling resistors, be sure to maintain pin-1 orientation as shown below. Pin 1* 151 LI03C Pin 1 151 LI03C 242 242 Pin 1 * Pin 1 can be identified by a line or dot Pin 1 20 31 4 LI0IC3 ohm value Figure 4. Pin-1 Orientation on Resistor Networks Setting the SCSI ID Each device located on the SCSI bus must have a unique SCSI ID. The default value for your host adapter (which is just another device on the SCSI bus) is SCSI ID 7.
AHA-2740W/2742W/2744W ■ SCSI ID 0 is best reserved for the SCSI hard disk drive that will be used as your computer’s boot device; SCSI ID 1 is best reserved for a second SCSI hard disk drive. ■ If you are installing more than one SCSI host adapter, each adapter implements a different SCSI bus, so SCSI IDs can be reused. Changing the SCSI ID setting for the host adapter is software selectable only, and is done through your computer’s EISA configuration utility.
Configuring the Host Adapter The ECU typically allows you to select among a number of options, including copying new configuration files. Select this option to install the !adp7771.cfg and adp7770.ovl files from the host adapter diskette to the bootable configuration diskette. If the ECU does not provide such an option, you can also use the DOS Copy command to copy these files to the bootable configuration diskette.
AHA-2740W/2742W/2744W Note: The BIOS must be enabled if you want the computer to boot from a SCSI hard drive attached to the host adapter. Host Adapter SCSI ID Defines the SCSI ID (0-15) setting for the host adapter. The default is 7, which is the recommended setting. Each installed SCSI device must have a unique SCSI ID. Note: If any SCSI device is connected to the 50-pin internal SCSI connector, the host adapter SCSI ID must be assigned a value that ranges from 0 to 7.
BIOS Configuration BIOS Configuration This option allows you to make changes to the configuration of the host adapter BIOS. Use the cursor keys to move between options. To toggle values for each option, press the Enter key. Support Removable Disks as Fixed Disk Allows you to configure removable media drives supported by the BIOS. The following choices are available: ■ Boot Device Only — Only the removable media drive designated as the boot device will be treated as a fixed disk.
AHA-2740W/2742W/2744W Support for Bootable CD-ROM Allows you to boot from a CD-ROM drive. Support for Int 13h Extensions Provides a mechanism to support disks with more than 1024 cylinders, and to add support for software control of device locking for removable media. SCSI Device Configuration This option allows you to customize the configuration of the SCSI devices connected on the SCSI bus. Use the cursor keys to move between options. To toggle values for each option, press the Enter key.
Utilities Include in BIOS Scan Allows Int 13h devices (hard drives) attached to the SCSI bus to be recognized by the host adapter BIOS and installed as devices on the system without the need for device driver software. Error if Device Not Found Selects whether the user will be notified if the BIOS is unable to find the device during the boot procedure. Send Start Unit Command Used for devices that require a command to start up after power-on. Most devices do not require this.
AHA-2740W/2742W/2744W Adaptec EZ-SCSI Software Adaptec EZ-SCSI for DOS/Windows, Windows 95, and Windows NT™ is included in this package. Use the menu-driven software to install drivers and configure your DOS/Windows operating system automatically. Other Operating Environments AHA-2740W/2742W/2744W host adapters support OS/2, SCO, and Novell™ NetWare and Unixware operating systems.
Troubleshooting Checklist Troubleshooting Checklist Most problems that might occur during installation can be traced to errors in preparing devices on the SCSI bus. The following suggestions should help you to solve any problems that you may encounter. If a problem occurs during installation, check the following items first: 1 Be sure all SCSI devices are connected to power. Connect internal devices to your computer’s power supply; plug external devices into a grounded line power outlet.
