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740cov.doc Black 2 Adaptec, Inc. 691 South Milpitas Boulevard Milpitas, CA 95035 Copyright © 1993, 1994, Adaptec, Inc. All rights reserved. Adaptec and the Adaptec logo are registered trademarks of Adaptec, Inc. Printed in Singapore STOCK NO.: 510646-00 Rev. A LL 8/94 Information subject to change without notice.
2740w-0.doc Black i Copyright Copyright © 1993, 1994 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, and AHA are registered trademarks; and EZ-SCSI is a trademark of Adaptec, Inc.
2740w-0.doc Black ii Adaptec Technical Support Adaptec products have been specifically developed for easy installation and use. We believe that our documents and the onscreen instructions and help are complete and clear enough to meet your needs. If you need more assistance, please contact us. The Adaptec Electronic Bulletin Board Service (BBS) provides information on software upgrades, new releases, technical advice, and other topics.
2740w-0.doc Black iii Literature Hotline To request additional documentation for Adaptec products, call 800-934-2766, M-F: 5:00 a.m. to 6:00 p.m., Pacific Time. 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.
2740w-0.doc Black iv CAUTION: Only equipment certified to comply with Class B (computer input/output devices, terminals, printers, etc.) should be attached to this equipment, and must have shielded interface cables. Finally, any change or modifications to the equipment by the user not expressly approved by the grantee or manufacturer could void the user's authority to operate such equipment. Each host adapter is equipped with an FCC compliance label which shows only the FCC identification number.
2740w-ig.toc Black v Table of Contents Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 The Onboard Floppy Controller (AHA-2742W and AHA-2744W Only) . . . . . . . . . 7 Installing the Host Adapter . . . . . . . . . . . . . . . . . . . . . . 8 Cabling the Host Adapter . . . . . . . . . . . . . . . . . . . . . . .
2740w-ig.toc Black vi Operating Environment Software . . . . . . . . . . . . . . . . 30 DOS/Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Novell NetWare®, OS/2®, and UNIX® . . . . . . . . . 31 Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . .
2740w-ig.doc Black 1 Getting Started This document provides the steps required for installation of the AHA-2740W and AHA-2742W single-ended, and the AHA-2744W differential EISA-to-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.
2740w-ig.doc Black 2 AHA-2740W/2742W/2744W Board Layout Figure 1 shows the location of the major components on the AHA-2740W and AHA-2742W host adapters; Table 1 provides a description of each component for the AHA-2740W and AHA-2742W. J1 J2 J3 J4 PIN 1 U3 J5 PIN 1 U7 U1 U11 U12 J6 Figure 1.
2740w-ig.doc Black 3 Board Layout Table 1.
2740w-ig.doc Black 4 AHA-2740W/2742W/2744W Figure 2 shows the location of the major components on the AHA-2744W host adapter; Table 2 provides a description of each component for the AHA-2744W. J1 J2 J3 J4 Pin 1 U35 J5 Pin 1 U21 U7 U33 U34 Figure 2.
2740w-ig.doc Black 5 Board Layout Table 2.
2740w-ig.doc Black 6 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.
2740w-ig.doc Black 7 Default Settings The Onboard Floppy Controller (AHA-2742W and AHA-2744W Only) • If your floppy diskette drives are already running under another controller, disable the onboard floppy controller by removing the jumper connector on jumper J1. • To use the onboard floppy controller, leave the jumper connector installed on jumper J1 and then disable your existing floppy controller; refer to your computer or floppy controller user documentation.
2740w-ig.doc Black 8 AHA-2740W/2742W/2744W 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.
2740w-ig.doc Black 9 Cabling the Host Adapter Cabling the Host Adapter The AHA-2740W/2742W/2744W has three cable connectors for connecting SCSI devices: two for connecting internal SCSI devices and one for connecting external SCSI devices. The two internal SCSI connectors consist of a 50-pin and 68-pin connector. The single external connector consists of a 68-pin connector. In addition, the AHA-2742W and AHA-2744W has a cable connector that allows you to connect up to two floppy disk drives.
2740w-ig.doc Black 10 AHA-2740W/2742W/2744W The AHA-2740W/2742W/2744W can accommodate a single SCSI bus with up to a total of 15 SCSI devices connected. Note: Only single-ended SCSI devices are supported by the AHA-2740W/2742W host adapters and only differential SCSI devices are supported by the AHA-2744W host adapter.
2740w-ig.doc Black 11 Cabling the Host Adapter Wide SCSI devices can be connected to the 68-pin internal connector. Note: Only two of the three SCSI connectors can have devices connected at any one time. The total number of SCSI devices that can be connected to the host adapter is 15. 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.
2740w-ig.doc Black 12 AHA-2740W/2742W/2744W previous device until all external SCSI devices have been connected. Up to 15 external Wide SCSI devices can be connected to the 68-pin external connector. Note: Only two of the three SCSI connectors can have devices connected at any one time. The total number of SCSI devices that can be connected to the host adapter is 15. The external connector on the host adapter uses a 68-pin shielded cable with a high-density external connector.
2740w-ig.doc Black 13 Cabling the Host Adapter 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 Connecting Internal SCSI Devices.
2740w-ig.doc Black 14 AHA-2740W/2742W/2744W Terminating the SCSI Bus To reduce signal reflections on the SCSI bus, the first and last physical SCSI devices on the ends of the SCSI bus must have a set of resistors called terminators either installed or enabled. In addition, termination on the host adapter itself must be properly configured. All other SCSI devices installed between the ends of the SCSI bus must have their terminators either removed or disabled.
2740w-ig.doc Black 15 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 done through your computer’s EISA configuration utility. Refer to Configuring the Host Adapter for instructions. Table 4 describes the possible configurations for host adapter termination. Table 4.
2740w-ig.doc Black 16 AHA-2740W/2742W/2744W For the AHA-2744W, host adapter termination is configured by installing/removing the Resistor Networks (RNs). Figure 3 shows the location of the RNs on the AHA-2744W. Table 5 describes possible RN configurations. RN3 RN4 RN5 RN7 RN8 RN1 RN2 RN10 RN11 RN6 RN9 Pin 1* RN12 * Pin 1 is always on the left side of the resistor Figure 3.
2740w-ig.doc Black 17 Terminating the SCSI Bus 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 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. 1RN1, RN2, RN9, RN10, RN11, and RN12 are 330 ohm resistor networks.
2740w-ig.doc Black 18 AHA-2740W/2742W/2744W Note: When reinstalling resistors, make 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.
40w-ig.doc Black 19 Setting the SCSI ID Setting the SCSI ID For each device located on the SCSI bus, a unique SCSI ID must be assigned. The default value for your host adapter (which is just another device on the SCSI bus) is SCSI ID 7. 8-bit SCSI devices can be assigned IDs that range from 0 to 7. 16-bit Wide SCSI devices can be assigned IDs that range from 0 to 15.
2740w-ig.doc Black 20 AHA-2740W/2742W/2744W • 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. Refer to Configuring the Host Adapter for instructions. The SCSI ID on most SCSI devices is typically set with jumpers or switches on the SCSI device.
2740w-ig.doc Black 21 Configuring the Host Adapter Configuring the Host Adapter A configuration diskette containing an EISA Configuration Utility (ECU) is normally supplied by the EISA system vendor. Depending on the ECU supplied with your system, host adapter configuration will vary. The basic steps involved in running the ECU are explained in this section. Note: Always refer to the documentation provided with your EISA system for instructions on adding and configuring adapter boards.
2740w-ig.doc Black 22 AHA-2740W/2742W/2744W 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.
2740w-ig.doc Black 23 Configuring the Host Adapter Bus Release Time Configures the amount of time, in BCLKS (Bus Clocks), the host adapter will continue to transfer data after being pre-empted in Bus Master mode. Normally 44 BCLKS is optimum; however, if multiple bus master cards are installed in the system, you may want to lower the value to free the EISA bus sooner. Data FIFO Threshold Configures the percentage used by the host adapter to manage its internal data FIFO.
2740w-ig.doc Black 24 AHA-2740W/2742W/2744W Host Adapter SCSI ID Configures the SCSI ID (0-15) setting for the host adapter. Each installed SCSI device must have a unique SCSI ID. Refer to Setting the SCSI ID for additional information. 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; SCSI ID 7 is recommended for the host adapter.
2740w-ig.doc Black 25 Configuring the Host Adapter SCSI Bus Reset at Power-on Enables or disables a SCSI bus reset generated by the host adapter during its power-on initialization, and after a Hard Reset. Normally, SCSI Bus Reset at Power-on should always be enabled. SCSI Bus Termination Configures host adapter termination. Refer to Configuring Host Adapter Termination for appropriate settings.
2740w-ig.doc Black 26 AHA-2740W/2742W/2744W BIOS and SCSI Device Configuration BIOS Configuration This option allows you to configure 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.
2740w-ig.doc Black 27 BIOS and SCSI Device Configuration Extended Translation for Drives > 1 GByte Provides a mechanism for using hard disks with capacities greater than 1 GByte. If this option is enabled, the following translation schemes are used: • SCSI hard disks ≤ 1 GByte use a translation scheme of 64 heads, 32 sectors per track. • SCSI hard disks > 1GByte use a translation scheme of 255 heads, 63 sectors per track.
2740w-ig.doc Black 28 AHA-2740W/2742W/2744W Initiate Sync Negotiation Allows the host adapter to attempt to use the faster synchronous protocol for data transfers on the SCSI bus. If deselected, the transfer will be done asynchronously, unless a SCSI device itself requests synchronous negotiation. Maximum Sync Transfer Rate Allows selection of the highest data transfer speed that the host adapter will attempt with that peripheral. The host adapter supports rates up to the Fast SCSI maximum of 10 MBytes/sec.
2740w-ig.doc Black 29 Utilities Utilities Select Utilities from the ECU to access the two SCSI utilities that are available with your host adapter. Disk Format Utility Accesses the Adaptec SCSI Low-Level Format utility. Most SCSI disk drives are preformatted, and do not need reformatting.
2740w-ig.doc Black 30 AHA-2740W/2742W/2744W Operating Environment Software DOS/Windows Under MS-DOS® 5.0 or higher, up to eight SCSI hard disk drives can be connected to the SCSI bus without additional software (older versions of DOS support up to two hard disk drives). Additional software is required if you desire to do the following: • Support more than two fixed disk drives under versions of MS-DOS prior to version 5.0. • Support up to eight fixed disk drives under MS-DOS 5.0 or higher.
2740w-ig.doc Black 31 Operating Environment Software Novell NetWare®, OS/2®, and UNIX® You may not need to install additional environment software in order to use your host adapter. Adaptec is working with major operating system suppliers to provide embedded support in their operating systems. Please contact Adaptec or your operating system vendor for information on the current schedule for I/O operating environment software support.
2740w-ig.doc Black 32 AHA-2740W/2742W/2744W 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: ❒ 32 1 Be sure all SCSI devices are connected to power.
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