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Adaptec AHA-2740 User Manual

Single-channel & twinchannel eisa-to-fast scsi host adapters
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Download this manual See also: Installation Manual
AHA-2740/2742
Single-Channel
AHA-2740T/2742T
TwinChannel
EISA-to-Fast SCSI Host Adapters
User's Manual
Adaptec AHA-2740 Series User's Manual
Stock Number: 510381-00 / Rev. C
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93
ECN Date: 9/14/93
(Page A-1)

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  • Page 1 AHA-2740/2742 Single-Channel AHA-2740T/2742T TwinChannel EISA-to-Fast SCSI Host Adapters User’s Manual Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page A-1) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...
  • Page 2 Adaptec, Inc. 691 South Milpitas Boulevard Milpitas, CA 95035 Copyright © 1993, Adaptec, Inc. All rights reserved. Adaptec and the Adaptec logo are registered trademarks of Adaptec, Inc. Printed in Singapore STOCK NO.: 510381-00 Rev. C LL 9/93 Information subject to change without notice.
  • Page 3 AHA-2740/2742 Single-Channel AHA-2740T/2742T TwinChannel EISA-to-Fast SCSI Host Adapters User’s Manual Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 (Page 0-i) ECN Date: 9/14/93...
  • Page 4 Copyright Copyright © 1993 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.
  • Page 5 Each AHA-2740 Series host adapter is equipped with an FCC compliance label which shows only the FCC identification number. The full text of the associated label follows: This device complies with part 15 of the FCC rules.
  • Page 6 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-iv) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 7: Table Of Contents

    Unpacking and Inspection ......1-8 Adaptec Technical Support ......1-9 Getting Started About This Chapter .
  • Page 8 Connector ........A-8 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 9 ..........Index-1 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 10 Figure 3-15. Utility Selection......3-20 viii Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C...
  • Page 11 Table A-5. External Connector Pin Assignments ..A-7 Table A-6. Output and Input Signals ....A-8 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C...
  • Page 12 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 13: Preface

    Preface Inside This Manual This manual provides complete instructions on how to install and use the Adaptec AHA-2740 Series of EISA-to-Fast SCSI Host Adapters. Chapter 1, Introduction, provides general information about the Adaptec AHA-2740 Series of host adapters. The features, board layout, and default settings are included.

  • Page 14: Conventions

    (.. select Backup Device and ..). Helvetica Used for operator entry that must be typed exactly as shown ( .. device=c:\adaptec\aspidos.sys ..) and for screen messages (..Enter Password ..). Helvetica Italics Used as a place holder for text you must determine and type in (..

  • Page 15: Advisories

    This type of advisory is a visual alarm. Failure to observe this type of advisory could result in injury to the user. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 16 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-xiv) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...
  • Page 17 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 18: Introduction

    Introduction About This Chapter Read this chapter to find out: An overview of the AHA-2740 Series of EISA-to-Fast SCSI host adapters The features of the AHA-2740 Series The layout of the host adapter and all its major components The default settings of the host adapter and how to...
  • Page 19 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 1-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 20: Overview

    EISA (Extended Industry Standard Architecture) bus and the SCSI (Small Computer System Interface) bus. The AHA-2740 Series is a bus master device that transfers data into host memory at burst rates of 33 MBytes/sec. These transfers are generally 32 bits wide, except when transferring data into 8- or 16-bit memory.

  • Page 21: Features

    The AHA-2740 Series supports only single-ended SCSI devices. Most of the SCSI drives on the market today are of this type. Like all EISA I/O cards, the AHA-2740 Series does not have jump- ers to change various EISA configuration options. These options are changed via the EISA Configuration utility provided with every EISA system;...

  • Page 22: Fully Disk Array Capable

    Multiple LUN support Parity handling in Data, Message, and Command phases Multiple Device and Applications Support The AHA-2740/2742 can be used to install up to seven SCSI devices The AHA-2740T/2742T can be used to install up to 14 SCSI devices...

  • Page 23: Board Layout

    AHA-2740 Series User’s Manual The AHA-2740 Series BIOS fully supports the extended parti- tioning capabilities of DOS 3.3 for up to two drives and DOS 5.0 and above for up to seven drives per host adapter, eight total The AHA-2740 Series supports both fixed and removable...

  • Page 24: Default Settings

    SCSI Bus Termination Extended Translation for Drives > 1 GByte Support More Than Two Drives Support Removable Disks as Fixed Disks Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 25: The On-Board Floppy Controller (Aha-2742/2742T Only)

    Before handling the host adapter, always ground yourself by touching the system chassis of your computer. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 26: Adaptec Technical Support

    Adaptec Technical Support The AHA-2740 Series has been specifically developed for easy installation and use. We hope that our manuals, and the on- screen instructions and help available in both the host adapter Configuration Software and Adaptec I/O Operating Environment Software installation programs, are complete and clear enough to meet your needs.
  • Page 27 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 1-10) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 28: Getting Started

    The instructions a user who is new to SCSI, or has lim- ited experience, can use to install the host adapter and SCSI devices Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 29 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 2-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 30: Installation Overview

    Connecting cables and devices Reassembling the system Configuring the host adapter with the EISA Configuration utility (described in Chapter 3) Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 31: The Host Adapter And The Scsi Bus

    AHA-2740 Series User’s Manual The Host Adapter and the SCSI Bus The AHA-2740 Series acts on your computer’s behalf as the host to your suite of SCSI devices. Each chain of SCSI peripheral devices and their host adapter work together, and is referred to as a SCSI bus.

  • Page 32: Quick Installation

    Quick Installation The following installation procedures are intended to help experi- enced users quickly install the AHA-2740 Series of host adapters into an EISA computer system. If you are new to computer peripheral installation or would like more information, refer to the more comprehensive instructions and illustrations found in the Installation section of this chapter.

  • Page 33: Install Your Host Adapter And Peripherals

    To connect subsequent external SCSI devices, you will need to obtain additional shielded cables to chain the devices together. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 34: Configure The Host Adapter

    Select the option in the utility that allows you configure the EISA slot in which the host adapter is installed. Configure the host adapter parameters. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 35: Installation

    (AHA-2740T/2742T ONLY) PIN 1 SCSI CHANNEL B INTERNAL CONNECTOR (AHA-2740T/2742T ONLY) Figure 2-1. Connectors on the Host Adapter Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 Note SCSI CHANNEL A...

  • Page 36: Termination On The Scsi Bus

    Improper termination of the SCSI bus results in erratic device operation or general bus fail- ure. Table 2-1 describes the three possible SCSI device and Adaptec Host Adapter (AHA) configurations. Table 2-1. SCSI Device and AHA Configuration...

  • Page 37: Figure 2-3. Internal Devices Only

    EXTERNAL DEVICE EXTERNAL DEVICE NO TERMINATION NO TERMINATION Figure 2-4. External Devices Only 2-10 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 INTERNAL DEVICE INTERNAL DEVICE NO TERMINATION...
  • Page 38 SCSI bus instead of from the drives power supply. This option is acceptable since the AHA-2740 Series of host adapters always supplies termina- tion power on the SCSI bus. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.

  • Page 39: Scsi Id Setting

    SCSI device. Refer to the SCSI device doc- umentation for information on changing the SCSI ID on other SCSI devices. 2-12 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 40: Board Installation

    Turn OFF and disconnect power to the system and external equipment before removing the chassis cover or attempting any motherboard modifications. To install the AHA-2740 Series of host adapters in your EISA computer system: Remove the cover of your EISA computer system to expose the EISA bus slots on the motherboard.

  • Page 41: Scsi Bus Activity Led Connector

    1 and 2 of the LED connector. PIN 1 LED CONNECTOR Figure 2-5. SCSI LED Connector 2-14 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 Note...

  • Page 42: Connecting Peripherals

    Connecting Peripherals Up to seven SCSI devices can be connected to the internal and external connectors on the AHA-2740/2742. Up to two floppy disk- ette drives can be connected to the floppy connector on the AHA- 2742/2742T. Always refer to the manufacturer’s documentation before connecting and installing your SCSI device(s) and/or floppy diskette drive(s).
  • Page 43 Connect one end of the 50-pin SCSI ribbon cable to the internal connector on the host adapter, as shown in Figure 2-6. 2-16 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 44: Figure 2-6. Connecting Cable To Internal Connector

    SCSI device, as shown in Figure 2-7. PIN 1 INTERNAL SCSI DEVICE Figure 2-7. Connecting Cable to SCSI Device Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 45: Figure 2-8. Connecting A Second Internal Scsi Device

    To connect external SCSI devices: Connect one end of the external cable to the host adapter external connector, as shown in Figure 2-9. 2-18 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 46: Figure 2-9. Connecting External Cable To Host Adapter

    Connect the other end of the external cable to either one of the SCSI connectors on the SCSI device, as shown in Figure 2-10. Figure 2-10. Connecting External Cable to SCSI Device Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 47: Figure 2-11. Connecting Multiple External Scsi Devices

    If you are not using the floppy controller on the AHA-2742/2742T, be sure to disable it by removing the jumper shunt on Jumper J4. 2-20 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 48: Figure 2-12. Connecting Floppy Cable To Host Adapter

    COLORED STRIPE FLOPPY PIN 1 CONNECTOR Figure 2-12. Connecting Floppy Cable to Host Adapter Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 Getting Started FLOPPY RIBBON...

  • Page 49: Figure 2-13. Connecting Floppy Cable To Floppy Drive

    (Drive B), as shown in Figure 2-14. PIN 1 FLOPPY DISKETTE DRIVE TO 1ST FLOPPY Figure 2-14. Connecting a Second Floppy Drive 2-22 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 COLORED STRIPE COLORED...

  • Page 50: Before Re-Booting Your System

    Refer to your system and SCSI device documentation to replace the system cover and connect all system and SCSI device power cables. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 51 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 2-24) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 52: Configuring The Host Adapter

    The options available to configure the host adapter BIOS and the devices connected to the host adapter The two utilities available in the EISA Configuration utility Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 53 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 3-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 54: The Eisa Configuration Utility

    Exit the EISA Configuration utility The screens displayed in this chapter may vary from the screens dis- played by the EISA Configuration utility supplied with your system. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 55: Run The Eisa Configuration Utility

    Figure 3-1. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 56: Configure The Host Adapter Parameters

    Figure 3-2 displays your choices. The default setting is IRQ 11. Multiple AHA-2740 Series host adapters installed in your system can share the same IRQ; however, to increase system perfor- mance, you may want to select a different IRQ for each host adapter installed.

  • Page 57: Figure 3-2. Selecting Interrupt Level

    AHA-2740 Series User’s Manual The IRQ cannot be shared with ISA mode SCSI host adapters such as the Adaptec AHA-1540 and AHA-1520 Series adapters. If those adapters are installed in your EISA system, they must be assigned unique IRQs. Host Adapter Interface Definitions...

  • Page 58: Figure 3-3. Selecting Bus Release Time

    ) 75% ) 50% Done=F10 <Edit Resources=F6> <Cancel=ESC> Figure 3-4. Selecting Data FIFO Threshold Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 Configuring the Host Adapter...

  • Page 59: Figure 3-5. Selecting Host Adapter Bios Base Address

    ) E4000H ) E8000H ) BIOS disabled Done=F10 <Edit Resources=F6> Figure 3-5. Selecting Host Adapter BIOS Base Address Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 Note <Cancel=ESC>...

  • Page 60: Figure 3-6. Selecting Host Adapter Scsi Id

    7 is normally assigned to the host adapter; SCSI IDs 0 and 1 should be reserved for SCSI hard disk drives. If two host adapters are installed, each would have its own SCSI bus, thus each host adapter would still be set to SCSI ID 7. Refer...

  • Page 61: Figure 3-7. Selecting Scsi Bus Parity

    SCSI bus can respond to the shorter selection time. 3-10 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 <Cancel=ESC>...

  • Page 62: Figure 3-8. Selecting Scsi Selection Timeout

    ) Disabled Done=F10 <Edit Resources=F6> <Cancel=ESC> Figure 3-9. Selecting SCSI Bus Reset at Power-on Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 Configuring the Host Adapter...

  • Page 63: Bios And Device Configuration

    BIOS and Device Configuration ) BIOS configuration ) Device configuration <ESC> Figure 3-11. BIOS and Device Configuration 3-12 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 <Cancel=ESC> (Page 3-12)

  • Page 64: Figure 3-12. Bios Configuration Selection

    Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 65 SCSI ID corresponds to that SCSI device. Use the cursor keys to move between options. To toggle values for each option, press the Enter key. 3-14 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 Note ®...

  • Page 66: Figure 3-13. Scsi Device Configuration

    SCSI device does support disconnect/reconnect, then Enable Disconnection should be enabled (set to yes). Most SCSI devices today do support disconnect/reconnect. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 67 8.0 MBytes/sec 6.67 MBytes/sec 5.7 MBytes/sec 5.0 MBytes/sec 4.4 MBytes/sec 4.0 MBytes/sec 3.6 MBytes/sec 3-16 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 Note (Page 3-16) ECN Date: 9/14/93...
  • Page 68 BIOS. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 69 If many drives are set to yes for the SCSI Start Unit Command, system boot time will vary depending on how long each drive takes to spin-up. 3-18 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 70: Exit The Eisa Configuration Utility

    Select Utilities from the EISA Configuration utility to access the two SCSI utilities that are available with your host adapter, as shown in Figure 3-15. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 71: Disk Format Utility

    MS-DOS fdisk and format . Most SCSI disk devices are pre-formatted, and do not need re-formatting. The Adaptec low-level formatting utility is compatible with the vast majority of today’s SCSI disk drives. Caution All data on the drive will be lost when performing a low-level for- mat.

  • Page 72: Host Adapter Diagnostic Utility

    This utility runs a diagnostic on your host adapter by doing DMA transfers between the SCSI host adapter and system memory. This test will run indefinitely until Esc is pressed. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 73 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 3-22) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 74: Troubleshooting

    Problems you may encounter and how to fix them How to resolve conflicts with other options Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 75 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 4-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 76: Scsi Troubleshooting Checklist

    SCSI Troubleshooting Checklist The AHA-2740 Series has been extensively tested for compatibil- ity with popular SCSI peripheral devices across various operating systems. Most problems that might occur during installation can be traced to errors in preparing devices on the SCSI bus.

  • Page 77: Problems And Solutions

    EISA Configuration utility. See Utilities in Chapter 3. Similar formatting utilities for removable media devices are included in the Adaptec EZ-SCSI software package for the DOS/Windows environment. Refer to Appendix B, I/O Operating Environment. These utilities are also available from the Adaptec BBS.
  • Page 78 The disk drive may be defective. Consult the hardware documentation and contact the manufacturer. 05h - Illegal request The Adaptec formatting utility does not support a low-level format of this device. The device may already be low-level formatted by the manufacturer. (This error rarely occurs.) Adaptec AHA-2740 Series User’s Manual...
  • Page 79 Verify that you are using the correct .cfg file and .ovl file for the host adapter. Also, other EISA boards and their position on the bus could be causing the board to be mis-identified. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 80: Conflicts With Other Options

    Change the IRQ settings with the EISA Configuration utility. Use the EISA Configuration utility to view BIOS addresses for the host adapter and, if necessary, change them. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 81 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 4-8) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 82: Specifications

    Specifications About This Appendix Read this appendix to find out: Technical specifications of the AHA-2740 Series host adapter, EISA interface, SCSI interface, and floppy disk interface Pin assignments for the internal and external SCSI connectors Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 83 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page A-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 84: Technical Information

    Technical Information The basic technical specifications of the host adapter are described below. If you need more detailed information, contact Adaptec’s Literature Department at the address or phone numbers listed in Chapter 1, Introduction. Product Specifications Physical Dimensions Length: 7.0 inches Width: 0.625 inches...

  • Page 85: Extended Industry-Standard Architecture Interface

    Definition Low-level output voltage 0.0 to 0.5 volts DC at 48 mA High-level output voltage 2.5 to 5.25 volts DC (signal Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 0.4 volts maximum...

  • Page 86: Table A-3. Input Signals

    Alternative 1 connector, as specified in ANSI X3.131-1986. Table A-4 lists the pin assign- ments for the internal connector. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 87: Table A-4. Internal Connector Pin Assignments

    Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 Signal Name -DB(0) -DB(1) -DB(2) -DB(3) -DB(4) -DB(5) -DB(6)

  • Page 88: Table A-5. External Connector Pin Assignments

    Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 Specifications Signal Name -DB(0) -DB(1) -DB(2) -DB(3)

  • Page 89: Floppy Disk Interface

    Tied to +5 volt supply through 150 ohm resistors. Schmitt Trigger with 0.8-volt hysteresis. Connector The floppy disk interface connector should be an unshrouded 34-pin header. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 0.5 volts maximum 5.25 volts maximum...

  • Page 90: I/O Operating Environment

    Whether or not you need additional software for your host adapter in the DOS/Windows environment Information on Adaptec’s EZ-SCSI I/O Operating Environment Software that makes driver installation easier than ever before Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 91 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page B-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 92: Host Adapter Support

    Host Adapter Support 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.
  • Page 93 CD-ROM drives, check the hardware documentation for those devices. If the device requires ASPI support, you first need to run Adaptec EZ-SCSI to install an ASPI manager, and then install any other software provided with the device. If the device is designed to interface directly with the host adapter, then no ASPI manager is required.

  • Page 94: Optimizing Performance

    About This Appendix Read this appendix to find out: How to optimize your system’s performance after installing the host adapter Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 95 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page C-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 96: Performance Tips

    Enabling Synchronous Negotiation Synchronous negotiation is enabled (set to yes) by default on the AHA-2740 Series. You should normally enable this option on the host adapter because most SCSI devices support it and because it allows data to be transferred faster on the bus; however, because a few SCSI devices (e.g., certain CD-ROM drives) do not support...

  • Page 97: Enabling Scsi Bus Parity

    To enable/disable Send Start Unit Command, See Configure the BIOS and SCSI Device in Chapter 3. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 98: Dos/Windows Performance

    The Send Start Unit Command has no effect if the host adapter BIOS is disabled. DOS/Windows Performance Adaptec’s EZ-SCSI I/O Operating Environment Software is designed not only to simplify installation of device drivers under DOS, but also includes ASPI management software to provide Vir- tual DMA Services (VDS) support and enhanced Windows support.
  • Page 99 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page C-6) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 100: Disk Drives Over 1 Gigabyte

    An overview of extended translation and the DOS 1 GByte limit When to use the extended translation feature Questions and answers about extended translation Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 101 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page D-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 102: Extended Translation (Using Dos 5.0

    To continue its support for all SCSI disk drive capacities under DOS, Adaptec has introduced an extended translation scheme for the AHA-2740 Series of host adapters. This new feature bypasses the DOS disk capacity limit and supports disk drives up to 8 GBytes in size under DOS, providing room for years of disk drive evolution.

  • Page 103: When To Use Extended Translation

    8 MBytes, fdisk will round up to the nearest whole multiple of 8 MBytes. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...

  • Page 104: Questions And Answers About Extended Translation

    If you need to use software that is not compatible with extended translation, do not enable extended translation. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 105 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page D-6) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

  • Page 106: Glossary

    Definitions of technical terms used in this manual Definitions of terms commonly used in other documents and publications which discuss the SCSI-to-microcomputer peripheral connection Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 107 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page G-2) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...
  • Page 108 A user-friendly software program that automatically installs SCSI devices such as fixed disks and CD-ROM drives on a PC. Adaptec EZ-SCSI copies the required software programs to the PC’s fixed disk and edits the configuration files so the host adapter can access the devices.
  • Page 109 This is the fastest method of data transfer available for multi-tasking operating systems. Adaptec’s AHA-2740 Series of host adapters use bus mastering. Byte An eight-bit unit of data. A byte is normally the smallest address- able unit of memory and the smallest unit of transfer on the SCSI bus.
  • Page 110 The mechanism may require setup by the host software. After initialization, it automatically sequences the required data transfer and provides the necessary address information. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 111 An integrated circuit that buffers data in Glossary-6 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 112 The host adapter is sometimes called the initiator. Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C...
  • Page 113 Additional software that may be required in certain operating sys- tem environments in order to use some kinds of SCSI devices with the AHA-2740 Series of host adapters. For example, addi- tional software is needed in order to install CD-ROM drives on the SCSI bus in the DOS/Windows environment.
  • Page 114 The AHA- 2740 Series and all other Adaptec host adapters fully support multi-threaded I/O. PC-AT A family of small computers sold by IBM, also called the Personal Computer/AT family of computers.
  • Page 115 SCSI devices. In systems that have more than one host adapter, each adapter has its own sepa- rate SCSI bus. Glossary-10 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 116 Some SCSI devices use a differential grounding scheme. These devices are not supported by the AHA-2740 Series. Differential devices may be damaged if you connect them and the AHA-2740 Series to the same SCSI bus. Single-Threaded Operation Operation of the computer system such that only one program can be operating or active at a time.
  • Page 117 A Method of minimizing mechanical limitations of fixed disk by requesting data in an unordered sequence. The data is reordered by the host adapter. Glossary-12 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...

  • Page 118: Index

    Adaptec EZ-SCSI........B-4, C-5...
  • Page 119 CPU..........1-3, 1-4 Customer support See Technical support Index-2 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C Print Spec Number: 491709-00 Rev C Current Date: 9/1/93...
  • Page 120 ....... 1-8, 2-20 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 121 ........4-6 Index-4 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C...
  • Page 122 Multiple host adapters ........2-4...
  • Page 123 Task scheduling ......... 1-4 Index-6 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C...
  • Page 124 Adaptec EZ-SCSI ........B-4...
  • Page 125 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page I-8) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...
  • Page 126 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page I-9) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...
  • Page 127 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page I-10) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...
  • Page 128 Unpacking and Inspection ......1-8 Adaptec Technical Support ......1-9 Getting Started About This Chapter .
  • Page 129 Connector ........A-8 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 130 ..........Index-1 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev.
  • Page 131 Figure 3-15. Utility Selection......3-20 viii Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C...
  • Page 132 Table A-5. External Connector Pin Assignments ..A-7 Table A-6. Output and Input Signals ....A-8 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C...
  • Page 133 Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93...

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