Adaptec AHA-2740-T User Manual Page 1

AHA-2740/2742Single-ChannelAHA-2740T/2742TTwinChannelEISA-to-Fast SCSI Host AdaptersUser’s ManualAdaptec AHA-2740 Series User’s Manual Stock Number:

List of FiguresFigure 1-1. Host Adapter Board Layout . . . . . . . . . . . . . . . . 1-6Figure 2-1. Connectors on the Host Adapter. . . . . . . . . .

DDisk Drives Over 1 GigabyteAbout This AppendixRead this appendix to find out:•An overview of extended translation and the DOS 1 GBytelimit•When to us

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page D-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

DExtended Translation (Using DOS 5.0)Adaptec host adapters have always supported the full range ofdisk drive sizes under all major operating systems.

When to Use Extended TranslationWith DOS Version 5 OnlyNetWare 386 and the newer versions of UNIX do not share the1024 cylinder limit of DOS and do no

Questions and Answers About ExtendedTranslationWhat happens if I enable extended translation with SCSI drives that areless than 1 GByte in capacity?Dr

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page D-6)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

GlossaryAbout This GlossaryRead this glossary to find out:•Definitions of technical terms used in this manual•Definitions of terms commonly used in ot

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page G-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

GlossaryAAdaptec EZ-SCSIA user-friendly software program that automatically installsSCSI devices such as fixed disks and CD-ROM drives on a PC.Adaptec

BBIOSBasic Input/Output System. Software coded into computer chipsfor various purposes. The BIOS on the motherboard of a PC is thespecial program used

List of TablesTable 1-1. Host Adapter Components . . . . . . . . . . . . . . . . . . 1-7Table 1-2. Host Adapter Default Settings. . . . . . . . . . .

CDBSee Command Descriptor BlockCommand Control BlockA software object prepared by the host microcomputer softwarefor the host adapter to provide it al

Disconnect/ReconnectDisconnect is the function that occurs when a target releases con-trol of the SCSI bus, allowing the bus to go to the Bus Free pha

such a manner that each byte placed in the buffer is removedfrom the buffer in the same order.FirmwareThe software that controls and manages the host

I/O Operating Environment SoftwareAdditional software that may be required in certain operating sys-tem environments in order to use some kinds of SCS

MByteMegabyte. A measure of computer storage. One MByte equals1,048,576 bytes. (A byte is the amount of storage needed to holdone character.)Micro Cha

Programmed Input/OutputA method of data transfer in which the host microprocessor trans-fers data to and from memory via the computer’s I/O ports. PIO

SCSI DeviceA device such as a host adapter board, fixed disk drive or CD-ROM drive that conforms to the SCSI interface standard and isattached to a SC

Synchronous Data Transfer NegotiationThe message exchange between the initiator and the target thatallows the negotiation of the data transfer frequen

Index!!adp7771.cfg configuration file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7AAdaptec EZ-SCSI. . . . . . . . . . . . . . . .

Bus clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Bus master . . . . . . . . . . . . . . . .

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

DDaisy-chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15Data FIFO threshold. . . . . . . . . . . . .

HHard disk drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9, D-1 – D-51 GByte support. . . . . . . . . . . . . . . . . . .

JJumper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4floppy enable. . . . . . . . . . . . . .

SSCSI bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3, 2-4, 3-9, 3-15connecting devices . . . . . . . . . . . . . . .

Technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9, 4-3TerminationSee SCSI terminationTransfer rateSee Dat

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page I-8)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page I-9)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page I-10)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

Table of ContentsPrefaceInside This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiConventions . . . . . . . . . . . . .

SCSI Bus Activity LED Connector . . . . . . . . . . . . . . . 2-14Connecting Peripherals . . . . . . . . . . . . . . . . . . . . . . . . 2-15Before

PrefaceInside This ManualThis manual provides complete instructions on how to install anduse the Adaptec AHA-2740 Series of EISA-to-Fast SCSI HostAdap

BI/O Operating EnvironmentAbout This Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1Host Adapter Support . . . . . . . . .

List of FiguresFigure 1-1. Host Adapter Board Layout . . . . . . . . . . . . . . . . 1-6Figure 2-1. Connectors on the Host Adapter. . . . . . . . . .

List of TablesTable 1-1. Host Adapter Components . . . . . . . . . . . . . . . . . . 1-7Table 1-2. Host Adapter Default Settings. . . . . . . . . . .

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

The Glossary has definitions of special terms used in this manualand in SCSI literature in general.The Index helps you locate specific information qui

AdvisoriesAdvisories are quick notes that stress an important point or warnof a potential hazard to the system, data, and/or the user. Thismanual uses

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-xiv)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-x)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

1IntroductionAbout This ChapterRead this chapter to find out:•An overview of the AHA-2740 Series of EISA-to-FastSCSI host adapters•The features of the

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 1-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

Adaptec, Inc.691 South Milpitas BoulevardMilpitas, CA 95035Copyright © 1993, Adaptec, Inc.All rights reserved. Adaptec and the Adaptec logoare regist

1OverviewThis user’s manual provides information on how to install andconfigure the AHA-2740 and AHA-2742 single-channel, and theAHA-2740T and AHA-27

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

Fully Disk Array Capable•Able to boot from any drive on the SCSI bus•Background processing permits smooth error recovery•Extensive support from leadin

•The AHA-2740 Series BIOS fully supports the extended parti-tioning capabilities of DOS 3.3 for up to two drives and DOS5.0 and above for up to seven

Table 1-1. Host Adapter ComponentsLocation DescriptionJ1 External LED ConnectorJ2 Floppy Connector (AHA-2742/2742T only)J3 SCSI Channel A Internal Con

The On-board Floppy Controller (AHA-2742/2742T Only)The on-board floppy controller on the AHA-2742/2742T is enabledby default and is controlled by Jum

Adaptec Technical SupportThe AHA-2740 Series has been specifically developed for easyinstallation and use. We hope that our manuals, and the on-screen

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 1-10)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

2Getting StartedAbout This ChapterRead this chapter to find out:•An overview of the steps involved in installing your hostadapter•A brief discussion o

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 2-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

AHA-2740/2742Single-ChannelAHA-2740T/2742TTwinChannelEISA-to-Fast SCSI Host AdaptersUser’s Manual▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲

2Installation OverviewThis chapter provides instructions that guide you throughpreparing SCSI devices for installation on the SCSI bus, install-ing th

The Host Adapter and the SCSI BusThe AHA-2740 Series acts on your computer’s behalf as the hostto your suite of SCSI devices. Each chain of SCSI perip

Quick InstallationThe following installation procedures are intended to help experi-enced users quickly install the AHA-2740 Series of host adaptersin

Install Your Host Adapter and PeripheralsOnce the SCSI bus is properly terminated and each SCSI deviceis set to a unique SCSI ID, you can physically i

6 If you are using the floppy controller on the AHA-2742/2742T,connect one end of the 34-pin floppy ribbon cable to the floppyconnector on the host ad

InstallationThis section is intended primarily for users who are new to SCSIperipherals, or have limited experience in installing an optionboard in th

Termination on the SCSI BusTo reduce signal reflections on the SCSI bus, the first and last physi-cal SCSI devices on the ends of the SCSI bus must ha

Internal Devices OnlyWhen only internal devices are connected to the host adapter, thelast device connected to the SCSI ribbon cable and the host adap

Terminating the Host AdapterThe factory installed bus terminators on the host adapter areenabled by default. Host adapter termination should be disabl

SCSI ID SettingEach SCSI device located on the SCSI bus must be set to aunique SCSI ID (0-7). The SCSI ID serves two purposes: ituniquely defines each

CopyrightCopyright © 1993 Adaptec, Inc. All rights reserved. No part of this publication maybe reproduced, stored in a retrieval system, or transmitte

Board InstallationTo install the host adapter in your EISA system, the chassiscover must be removed and the motherboard exposed. Alwaysrefer to your E

SCSI Bus Activity LED ConnectorMost computer systems have a disk drive activity light, usuallyan LED (Light Emitting Diode) on the front panel. If you

Connecting PeripheralsUp to seven SCSI devices can be connected to the internal andexternal connectors on the AHA-2740/2742. Up to two floppy disk-ett

connector. To connect SCSI devices to SCSI channel A, you willneed either an internal SCSI cable and/or external SCSI cable. Toconnect SCSI devices to

2 Connect the other end of the 50-pin SCSI ribbon cable to theconnector on the internal SCSI device, as shown in Figure 2-7.SCSI RIBBONCABLEPIN 1INTER

3 To connect a second internal SCSI device, plug the middleconnector of the SCSI ribbon cable to the connector on thesecond internal SCSI device, as s

2 Connect the other end of the external cable to either one of theSCSI connectors on the SCSI device, as shown in Figure 2-10.EXTERNALSCSI CABLEEXTERN

3 To connect subsequent external SCSI devices, obtain addi-tional external cables and chain each device to the previousdevice until all external SCSI

To connect floppy diskette drives:➤1 Connect one end of the 34-pin floppy ribbon cable to thefloppy connector on the host adapter, as shown in Figure

2 Connect the other end of the 34-pin floppy ribbon cable to theconnector on the first floppy drive (Drive A), as shown in Figure2-13.3 To connect a s

FCC Compliance StatementNOTE: This equipment has been tested and found to comply with the limits for aClass B digital device, pursuant to Part 15 of t

Before Re-booting Your SystemBefore re-booting your system and configuring your host adapter,make sure you have completed the following:➤1 The SCSI bu

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 2-24)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

3Configuring the Host AdapterAbout This ChapterRead this chapter to find out:•The steps involved in configuring your host adapter with theEISA Configu

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 3-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

3The EISA Configuration UtilityAll EISA machines are shipped with a bootable EISA Configurationdiskette that contains a software program generally kno

Run the EISA Configuration UtilityRun the EISA Configuration utility as instructed by the EISAsystem vendor.Place the bootable EISA configuration disk

NoteIf your host adapter is an AHA-2740T/2742T, a set of parametersfor SCSI Channel B is displayed and can be configured.Configure the Host Adapter Pa

NoteThe IRQ cannot be shared with ISA mode SCSI host adapterssuch as the Adaptec AHA-1540 and AHA-1520 Series adapters.If those adapters are installed

Data FIFO ThresholdSelect Data FIFO Threshold to configure the percentage usedby the host adapter. Figure 3-4 displays your choices. The defaultsettin

Host Adapter BIOS Base AddressSelect Host Adapter BIOS Base Address to configure theBIOS base address for the host adapter, or to disable the hostadap

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 0-iv)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

Host Adapter SCSI IDSelect Host Adapter SCSI ID to configure the SCSI ID (0-7)setting for the host adapter. Figure 3-6 displays your choices. Thedefau

SCSI Bus Parity CheckSelect SCSI Bus Parity Check to enable or disable SCSI busparity checking on the host adapter. Figure 3-7 displays yourchoices. T

SCSI Bus Reset at Power-onSelect SCSI Bus Reset at Power-on to enable or disable a SCSIbus reset generated by the host adapter during its power-oninit

SCSI Bus TerminationSelect SCSI Bus Termination to enable or disable SCSI terminationon the host adapter. Figure 3-10 displays your choices. The defau

BIOS ConfigurationBIOS Configuration allows you to configure the host adapterBIOS. Figure 3-12 displays your choices. Use the cursor keys tomove betwe

Extended Translation for Drives > 1 GByteThis option allows you to enable or disable extended translationfor SCSI hard disks with a capacity greate

Enable DisconnectionThis option is used to determine whether or not the host adapterwill allow a SCSI device to disconnect from the SCSI bus (some-tim

Initiate Sync NegotiationThis option determines whether or not the host adapter willinitiate synchronous negotiation with the SCSI device.When set to

The Fast SCSI synchronous data transfer rates are 10.0, 8.0, 6.67,and 5.7 MBytes/sec. If the host adapter is set not to negotiate forsynchronous data

Error if Device Not FoundThis option determines whether or not the host adapter BIOSgenerates an error message when the BIOS is unable to find thedevi

Table of ContentsPrefaceInside This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiConventions . . . . . . . . . . . . .

Exit SCSI Device ConfigurationWhen configuration of SCSI devices is complete, press Esc to exitSCSI device configuration; you will be prompted to eith

Disk Format UtilityThis utility allows you to low-level format your SCSI disk and/orverify disk media for defects.NoteWhen migrating hard disk drives

Disk VerifyOnce your SCSI disk is low-level formatted, disk verify scans thedisk’s media for defects. If bad blocks are found, you areprompted to reas

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 3-22)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

4TroubleshootingAbout This ChapterRead this chapter to find out:•How to use the troubleshooting checklist to diagnose prob-lems that may occur when yo

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 4-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

4SCSI Troubleshooting ChecklistThe AHA-2740 Series has been extensively tested for compatibil-ity with popular SCSI peripheral devices across various

Problems and SolutionsThe screen is difficult to read when I run the EISA Configuration utility.Try pressing F5 to toggle the display between color an

When I tried to use the format/verify utility on a disk device, I got anUnexpected SCSI Command Failure pop-up box with a lot of errorinformation. Wha

06h - Data protectThe removable media may be write-protected. Remove writeprotection and run the utility again.The Additional Sense Code field provide

SCSI Bus Activity LED Connector . . . . . . . . . . . . . . . 2-14Connecting Peripherals . . . . . . . . . . . . . . . . . . . . . . . . 2-15Before

Conflicts With Other OptionsYou will encounter problems if your host adapter and peripheraldevices use overlapping extended BIOS and I/O addresses. To

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page 4-8)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

ASpecificationsAbout This AppendixRead this appendix to find out:•Technical specifications of the AHA-2740 Series hostadapter, EISA interface, SCSI in

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page A-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

ATechnical InformationThe basic technical specifications of the host adapter are describedbelow. If you need more detailed information, contact Adapte

Extended Industry-Standard ArchitectureInterfaceTable A-1. Standard EISA Bus Electronic and Physical InterfaceDriver Output SignalsVOL0 volts minimum

Input SignalsSCSI inputs meet the following electrical characteristics on eachsignal, including both receivers and passive drivers:Table A-3. Input Si

Table A-4. Internal Connector Pin AssignmentsPin Signal Name Pin Signal Name1 Ground 2 -DB(0)3 Ground 4 -DB(1)5 Ground 6 -DB(2)7 Ground 8 -DB(3)9 Grou

External SCSI ConnectorThe external SCSI connector must be a shielded 50-pin high den-sity (Alternative 1) connector, as specified in proposed ANSIsta

Floppy Disk InterfaceStandard Electronic and Physical InterfaceTable A-6. Output and Input SignalsDriver Output SignalsVOL0 volts minimum 0.5 volts ma

BI/O Operating EnvironmentAbout This Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1Host Adapter Support . . . . . . . . .

BI/O Operating EnvironmentAbout This AppendixRead this appendix to find out:•If embedded support for your host adapter is availablewith your operating

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page B-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

BHost Adapter SupportYou may not need to install additional environment software inorder to use your host adapter. Adaptec is working with majoroperat

Adaptec EZ-SCSIIf you are running MS-DOS or MS-DOS with Windows, AdaptecEZ-SCSI I/O Operating Environment Software makes driverinstallation easier tha

COptimizing PerformanceAbout This AppendixRead this appendix to find out:•How to optimize your system’s performance afterinstalling the host adapterAd

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page C-2)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93

CPerformance TipsTher AHA-2740 Series is designed to maximize the performanceof your SCSI devices and computer. The following tips will helpyou take f

Enabling SCSI Bus ParityParity checking is a procedure used by the host adapter to verifythe accuracy of data transfer on the SCSI bus. Data verificat

Try enabling Send Start Unit Command for one peripheral at atime, rebooting each time to make sure each SCSI device worksproperly. (Some older disk de

Adaptec AHA-2740 Series User’s Manual Stock Number: 510381-00 / Rev. C (Page C-6)Print Spec Number: 491709-00 Rev CCurrent Date: 9/1/93