Adaptec Aha-2740w User manual

AHA-2740W/2742W/2744W

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▼ ▼ ▼ ▼ AHA-2740W/2742W

Single-ended

AHA-2744W Differential

EISA-to-Fast/Wide SCSI Host Adapters

Installation Guide

AHA-2740W/2742W/2744W

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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.

Windows NT is a trademark, and Windows and Windows 95 are registered trade-

marks of Microsoft Corporation in the U.S. and other countries used under license.

All other trademarks used are owned by their respective owners.

Changes

The material in this document is for information only and is subject to change with-

out notice. While reasonable efforts have been made in the preparation of this docu-

ment to assure its accuracy, Adaptec, Inc. assumes no liability resulting from errors or

omissions in this document, or from the use of the information contained herein.

Adaptec reserves the right to make changes in the product design without reservation

and without notification to its users.

iii

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Adaptec Technical Support and Services

If you have questions about installing or using your Adaptec product, check this doc-

ument first—you will find answers to most of your questions here. If you need fur-

ther assistance, please contact us. We offer the following support and information

services:

■For technical support, for information about the Adaptec Electronic Bulletin Board

Service (BBS) and the File Transfer Protocol (FTP) and World Wide Web (WWW)

Servers, and for access to the Interactive Fax system, call 800-959-SCSI (7274) or

408-945-2550, 24 hours a day, 7 days a week. To speak with a product support

representative, call 408-934-SCSI (7274), Monday through Friday, 6:00 A.M. to

5:00 P.M., Pacific Time; after these hours, on weekends, and on holidays, product

support is also available for a fee at 800-416-8066.

– The Adaptec BBS provides answers to commonly asked questions and infor-

mation on software upgrades and other topics. The BBS is available 24 hours

a day, 7 days a week, at 408-945-7727; 1200/2400/9600/14,400/28,800 baud,

8 data bits, 1 stop bit, no parity.

– The Adaptec FTP and WWW Servers provide product literature, answers to

commonly asked questions, and information on software upgrades and other

topics. The FTP and WWW Servers are available from the Internet 24 hours a

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– The Adaptec Interactive Fax system provides product literature, answers to

commonly asked questions, and current information about Adaptec products

and services. The Adaptec Interactive Fax system is available 23 hours a day,

7 days a week. The Fax system is out of service 1 hour each day. You can call

this service directly at 408-957-7150.

■For sales information, call 800-959-SCSI (7274) or 408-945-2550, Monday through

Friday, 6:00 A.M. to 5:00 P.M., Pacific Time.

■To order Adaptec software and cables, call 800-442-SCSI (7274) or 408-957-SCSI

(7274), Monday through Friday, 6:00 A.M. to 5:00 P.M., Pacific Time.

■To request additional documentation for Adaptec products, call 800-934-2766 or

510-732-3829, Monday through Friday, 6:00 A.M. to 5:00 P.M., Pacific Time.

AHA-2740W/2742W/2744W

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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, andcan

radiate radio frequency energy, and if not installed and used in accordance with the instructions,

may cause harmful interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation.

If this equipment does cause interference to radio or television equipment reception, whichcan be

determined by turning the equipment off and on, the user is encouraged to try to correct the inter-

ference by one or more of the following measures:

• Reorient or relocate the receiving antenna

• Move the equipment away from the receiver

• Plug the equipment into an outlet on a circuit different from that to which the receiver is

powered

• If necessary, the user should consult the dealer or an experienced radio/television technician

for additional suggestions

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 changes 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 that shows only the FCC identifica-

tion number. The full text of the associated label follows:

This device complies with part 15 of the FCC rules. Operation is subject to the following two con-

ditions: (1) this device may not cause harmful interference and (2) this device must accept any

interference received, including interference that may cause undesired operation.

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▼ ▼ ▼ ▼ 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 Adapter 12

Run the EISA Configuration Utility 12

Copy Configuration and Overlay Files 12

Select the Host Adapter 13

Configure the Host Adapter Parameters 13

Interrupt Level 13

Bus Release Time 13

Data FIFO Threshold 13

Host Adapter BIOS Base Address 13

Host Adapter SCSI ID 14

SCSI Bus Parity Check 14

SCSI Selection Timeout 14

SCSI Bus Reset at Power-on 14

SCSI Bus Termination 14

BIOS Configuration 15

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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

Other Operating Environments 18

Troubleshooting Checklist 19

Getting Started

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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. However, termination

is different for the AHA-2744W, and the AHA-2742W and

AHA-2744W have an onboard floppy controller. Installation of the

host adapter includes the following steps:

1Installing the AHA-2740W/2742W/2744W host adapter in an

EISA system.

2Installing the SCSI cable(s) and SCSI peripheral devices.

3Terminating the SCSI bus.

4Setting the SCSI ID.

5Adjusting the host adapter configuration settings if necessary.

6Loading software, if necessary.

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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.

Figure 1. Board Layout for the AHA-2740W and AHA-2742W

Table 1. AHA-2740W and AHA-2742W Components

Location Description

J1 Floppy Enable Jumper (AHA-2742W Only)

J2 External LED Connector

J3 Floppy Connector (AHA-2742W Only)

J4 68-pin Wide (16-bit) SCSI Internal Connector

J5 50-pin SCSI Internal Connector

J6 68-pin Wide SCSI External Connector

PIN 1PIN 1

J1 J3 J4 J5

Board Layout AHA-2744W

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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.

Figure 2. Board Layout for the AHA-2744W

Table 2. AHA-2744W Components

Location Description

J1 Floppy Enable Jumper

J2 External LED Connector

J3 Floppy Connector

J4 68-pin Wide Differential (16-bit) SCSI Internal Connector

J5 50-pin Differential (8-bit) SCSI Internal Connector

J6 68-pin Wide SCSI External Connector

Pin 1

J2 J3 J4

Pin 1

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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.

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 connec-

tor installed on jumper J1 and then disable your existing

floppy controller; refer to your computer or floppy controller

user documentation.

Table 3. Host Adapter Default Settings

Description Default Setting

Interrupt Level IRQ 11

Bus Release Time 44 BCLKS

Data FIFO Threshold 100%

Host Adapter BIOS Base Address D8000h

Host Adapter SCSI ID Device ID 7

SCSI Bus Parity Check Enabled

SCSI Selection Timeout 256 milliseconds

SCSI Bus Reset at Power-on Enabled

SCSI Bus Termination (Low/High) On/On

Support Removable Disks as Fixed Disk Boot Device Only

Extended Translation for Drives > 1 GByte Enabled

Support More Than Two Drives Enabled

Bootable CD-ROM Support Enabled

Int 13h Extensions Support Enabled

Installing the Host Adapter

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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:

1Remove the cover of your EISA personal computer to expose

the EISA bus slots on the motherboard.

2Locate an unused EISA slot in your system which supports bus

master operations (refer to the host system documentation for

details) and remove the corresponding slot cover.

3Align and insert the host adapter in the EISA slot.

4Secure the host adapter in your system.

Note: EISA boards require firmer seating than typical ISA

expansion boards. Make sure the host adapter is fully seated

in its slot.

Cabling the Host Adapter

The AHA-2740W/2742W/2744W has three cable connectors for

connecting SCSI devices: a 50-pin internal connector, a 68-pin inter-

nal connector, and a 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.

In addition, the AHA-2742W and AHA-2744W has a cable connector

that allows you to connect up to two floppy disk drives.

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Only 8-bit internal SCSI devices can be connected to the 50-pin inter-

nal 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.

Caution: 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. Differential SCSI devices may be damaged if con-

nected to the single-ended SCSI host adapter bus; similarly,

single-ended SCSI devices may be damaged if connected to

differential host adapters. Most SCSI devices currently pro-

duced are single-ended SCSI devices. Consult your SCSI

device user documentation.

Connecting Internal SCSI Devices

Internal devices are usually connected to the host adapter by a flat

SCSI ribbon cable. This cable has connectors at each end and addi-

tional connectors attached in the middle. One end of the cable is

attached to the internal connector on the host adapter, and the SCSI

devices are attached to the remaining connectors. The 50-pin inter-

nal connector uses a 50-pin SCSI ribbon cable with a 50-pin header

internal connector. The 68-pin internal connector uses a 68-pin SCSI

ribbon cable with a 68-pin high-density SCSI internal connector.

Up to 7 internal 8-bit devices can be connected to the 50-pin internal

connector, and up to 15 internal 16-bit Wide SCSI devices can be con-

nected to the 68-pin internal connector.

Note: Only two of the three SCSI connectors can have

devices connected at any one time. Up to 15 SCSI devices

can be connected to the host adapter.

Cabling the Host Adapter

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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 orien-

tation 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.

The 68-pin internal cable connectors are keyed and can only be

plugged in one way; pin-1 orientation is automatic.

Connecting External SCSI Devices

External devices are usually daisy-chained to the host adapter. This

means that a simple two-ended cable runs from the host adapter to

the connector on the first external device. A second connector on the

back of the external device allows another cable to connect it with

the second device in the chain.

To connect subsequent external SCSI devices, obtain additional

external cables and chain each device to the 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. External cable connec-

tors are keyed and can only be plugged in one way; pin-1 orienta-

tion is automatic.

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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.

Note: If you are not using the floppy controller on the

AHA-2742W and AHA-2744W, be sure to disable it by

removing the jumper connector on jumper J1.

The AHA-2742W and AHA-2744W support only floppy pri-

mary address 3F0h - 3F7h. The IRQ channel is hard-wired

for channel 6 and the DMA channel is hard-wired for

channel 2.

Terminating the SCSI Bus

To reduce signal reflections on the SCSI bus, the first and last physi-

cal SCSI devices on the ends of the SCSI bus must have a set of resis-

tors called terminators either installed or enabled. All other SCSI

devices installed between the ends of the SCSI bus must have their

terminators either removed or disabled. The host adapter must also

be properly terminated. If it is in the middle of the SCSI bus, it must

have its termination disabled (e.g., when there are both internal and

external SCSI devices). See Configuring Host Adapter Termination on

page 9 for a description of the termination configuration settings.

Note: The last device on the SCSI bus must have its termina-

tion installed or enabled. Many differential SCSI devices

currently produced have no provisions for terminators;

therefore, they need some external means of I/O line termi-

nation.

Refer to the manufacturer's documentation to determine how to

enable or disable termination on your SCSI device(s).

Terminating the SCSI Bus

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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.

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 possi-

ble RN configurations.

Figure 3. Location of Resistor Networks on the AHA-2744W

Table 4. SCSI Device and Host Adapter Configuration

Host Adapter

Termination

Devices Connected To Host Adapter Low High

68-pin internal connector only ON ON

68-pin external connector only ON ON

68-pin internal and 68-pin external

connectors OFF OFF

50-pin internal connector only ON ON

50-pin and 68-pin internal connectors OFF ON

50-pin internal and 68-pin external

connectors OFF ON

50-pin and 68-pin internal connectors,

and 68-pin external connector INVALID

RN1 RN2RN3 RN4 RN5

RN10 RN11

RN12

RN7 RN8

RN6

RN9

Pin 1*

* Pin 1 is always on the left side of the resistor

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Caution: When reinstalling resistors, you cannot install a

330-ohm resistor into a 150-ohm socket and vice versa. The

ohm value can be found in the part number printed on the

resistor. A 330-ohm resistor will have 330 or 331 included in

the part number printed on the resistor and a 150-ohm resis-

tor will have 150 or 151.

1 RN1, RN2, RN9, RN10, RN11, and RN12 are 330 ohm resistor networks.

RN3, RN4, RN5, RN6, RN7, and RN8 are 150 ohm resistor networks

Table 5. Termination Configuration for the AHA-2744W

Low High Install1Remove

OFF OFF None From RN1 to RN12

ON ON RN1, RN2, RN9,

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.

None

OFF ON RN9 and RN12 with

330 ohm bussed RNs.

RN3 and RN6 with

150 ohm isolated RNs.

RN1, RN2, RN4,

RN5, RN7, RN8,

RN10, and RN11

Setting the SCSI ID

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Note: When reinstalling resistors, be sure to maintain pin-1

orientation as shown below.

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.

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 (08 to

15 are available for Wide SCSI devices only).

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.

When configuring the SCSI ID, consider the following:

■You only need to change a device’s SCSI ID if it conflicts with

the SCSI ID of another device or another host adapter (assum-

ing they are on the same SCSI bus).

* Pin 1 can be identified

by a line or dot

LI0IC331 420

ohm value

LI03C151 242 LI03C151 242

Pin 1

Pin 1*

Pin 1

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■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 select-

able 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. Refer to the SCSI device documentation

for information on changing the SCSI ID on other SCSI devices.

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 configur-

ing adapter boards.

Run the EISA Configuration Utility

Place the bootable configuration diskette in an operative drive and

reset the system to boot from this diskette. Run the ECU as

instructed by the EISA system vendor.

After booting with the host adapter installed, ignore any error that

indicates that an unknown board has been detected in the system.

Copy Configuration and Overlay Files

The files you need configure your host adapter with your EISA sys-

tem are:

!adp7771.cfg

(configuration file) and

adp7770.ovl (

overlay

file). These files are located on the diskette that came with your host

adapter.

Configuring the Host Adapter

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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.

Select the Host Adapter

Once the files have been copied, run the option in the ECU that

allows you to configure the EISA slot in which the host adapter is

installed. A screen listing the host adapter parameters is displayed.

Configure the Host Adapter Parameters

This option allows you to change the host adapter parameters.

Interrupt Level

Defines the interrupt channel (IRQ) used by the host adapter. Multi-

ple AHA-2740W/2742W/2744W host adapters installed in your sys-

tem can share the same IRQ; however, to increase system

performance, you may want to select a different IRQ for each host

adapter installed. The default is IRQ 11 LEVEl.

Bus Release Time

Defines the amount of time, in BCLKS (Bus Clocks), the host adapter

will continue to transfer data after being pre-empted in Bus Master

mode. The default is 44 BCLKS. If you have multiple bus master

cards installed in the system, you may want to lower the value to

free the EISA bus sooner.

Data FIFO Threshold

Defines the percentage used by the host adapter to manage its inter-

nal data FIFO. 100% is the default.

Host Adapter BIOS Base Address

Defines the base BIOS address for the host adapter, or disables the

host adapter BIOS. The default address is D8000h. When choosing

the base address, verify that there is no conflict with other devices

using the same address.

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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.

SCSI Bus Parity Check

Enables or disables SCSI bus parity checking on the host adapter.

The default is Enabled. The host adapter always generates parity

when writing to the SCSI bus. If any attached SCSI devices do not

support SCSI parity checking, then SCSI Bus Parity Check should be

disabled. Most SCSI devices do support SCSI parity checking.

SCSI Selection Timeout

Defines the time, in milliseconds, the host adapter waits to respond

during the SCSI Selection phase. The default is 256 milliseconds.

Lowering the SCSI Selection Timeout will speed up SCSI bus scans

considerably; however, before lowering this value, make sure that

all the devices on the SCSI bus can respond to the shorter selection

time.

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. The

default is Enabled.

SCSI Bus Termination

Configures host adapter termination. Refer to Terminating the SCSI

Bus on page 8 for appropriate settings.

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