Adaptec AHA-3940U User Manual
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Adaptec AHA-3940U User Manual

Multichannel pci-to-ultrascsi host adapters
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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 User’s Guide AHA-3940U/3940UW/3940UWD MultiChannel PCI-to-UltraSCSI Host Adapters with SCSISelect Utility AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: Front Cover Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 Adaptec, Inc. 691 South Milpitas Boulevard Milpitas, CA 95035 © 1996, 1997, Adaptec, Inc. All rights reserved. Adaptec and the Adaptec logo are trademarks of Adaptec, Inc. which may be registered in some jurisdictions. Printed in Singapore STOCK NO.: 511041-00, Rev. B MR 2/97 AHA-3940U/3940UW/3940UWD User’s Guide...
  • Page 4 AHA-3940U/3940UW/ 3940UWD MultiChannel PCI-to-UltraSCSI Host Adapters with SCSISelect Utility User’s Guide AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: i Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 5 Copyright © 1996, 1997 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 writ- ten consent of Adaptec, Inc., 691 South Milpitas Blvd., Milpitas, CA 95035.
  • Page 6 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.
  • Page 7 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: iv Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 8: Table Of Contents

    Maximum Cable Lengths 2-5 Connecting Internal SCSI Devices 2-6 Connecting External SCSI Devices 2-9 Connecting External 8-bit and 16-bit Devices (AHA-3940UW or AHA-3940UWD) 2-11 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: v Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ...
  • Page 9 AHA-3940U/3940UW/3940UWD User’s Guide Terminating the SCSI Bus 2-12 Terminating SCSI Devices 2-12 Terminating the Host Adapter 2-12 Terminating SCSI Channel A on the AHA-3940U/ 3940UW and Both Channels on the AHA-3940UWD 2-13 Terminating SCSI Channel B on the AHA-3940U/ 3940UW 2-14...
  • Page 10 When Not to Use Extended Translation C-2 Installing or Repartitioning Disks C-2 Extended Translation With SCSI Drives Smaller Than 1 Gbyte C-2 Index AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: vii Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ...
  • Page 11 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: viii Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 12 Figures Figure AHA-3940U Components 2-2 AHA-3940UW Components 2-2 AHA-3940UWD Components 2-2 Inserting the Host Adapter 2-4 68-pin-to-50-pin Converter 2-7 Internal SCSI Ribbon Cable to Host Adapter 2-8 Internal SCSI Ribbon Cable to Internal SCSI Device 2-8 Connecting a Second Internal SCSI Device 2-9...
  • Page 13 AHA-3940U/3940UW/3940UWD User’s Guide Figure SCSI Device Configuration Screen for AHA-3940U 3-11 3-10 Advanced Configuration Options Screen 3-15 3-11 SCSI Disk Utilities Screen for AHA-3940UW/ 3940UWD 3-18 SCSI Devices Shared by Two Computers A-2 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B...

  • Page 14: Introduction

    PCI-to-PCI Bridges, contact the motherboard vendor. Each AHA-3940U/3940UW/3940UWD host adapter has two SCSI channels, each of which functions as an independent host adapter. With the AHA-3940U, you can connect up to seven 8-bit SCSI devices per channel. With the AHA-3940UW/3940UWD, you can connect up to fifteen 16-bit (Wide) SCSI devices per channel.

  • Page 15: Product Features

    AHA-3940U/3940UW/3940UWD host adapters can handle 32-bit bus master data transfers, including PCI-enhanced transfer com- mands. They support the same SCSI functions as other Adaptec host adapters, including new SCSI-2 features such as Tagged Queuing. AHA-3940U/3940UW/3940UWD host adapters support multi- threaded I/O operations, allowing simultaneous operations on mul- tiple SCSI targets or logical units.

  • Page 16: Pci Bus Interface

    PCI buses. This reduces bus traffic and increases system throughput. To use the AHA-3940U/3940UW/3940UWD, your computer must be PCI Rev. 2.1-compliant, and the motherboard BIOS must support PCI-to-PCI Bridges. To find out whether your computer meets these requirements, check with the system or motherboard vendor.

  • Page 17: Aha-3940Uw/3940Uwd

    AHA-3940U/3940UW/3940UWD User’s Guide AHA-3940UW/3940UWD Up to 40.0 MBytes/sec synchronous Wide UltraSCSI data rate per channel Up to 20.0 MBytes/sec synchronous Wide Fast SCSI data rate per channel Up to 10.0 MBytes/sec synchronous Wide SCSI data rate per channel Up to 6.0 MBytes/sec asynchronous Wide SCSI data rate per...

  • Page 18: Multiple Device Support

    Parity handling in Data, Message, Status, Selection/ Reselection, and Command phases Active negation Multiple Device Support AHA-3940U supports up to seven SCSI devices per channel (14 devices total) AHA-3940UW/3940UWD support up to 15 SCSI devices per channel (30 devices total) Onboard BIOS fully supports capabilities of MS-DOS 5.0 and...

  • Page 19: Conventions

    AHA-3940U/3940UW/3940UWD User’s Guide Conventions The following typographic conventions are used in this document: bold Used for keystrokes (… press the Enter key …) and screen selection fields (… select Advanced Configuration Options …). Helvetica Used for operator entry that must be typed exactly as shown (…...

  • Page 20: Advisories

    Use caution when handling any electrical equipment. Advisories in this document can only cover the procedures contained here, and not all situations may have been addressed. Adaptec does not claim to have included every condition or situation that might require a Caution or Warning.

  • Page 21: Support And Information Services

    AHA-3940U/3940UW/3940UWD host adapters are designed for easy installation and use. We have tried to make this document and our other documentation complete and clear. If you need further assistance, please contact Adaptec. We offer the following support and information services: Service Provided...

  • Page 22: Installing The Host Adapter And Scsi Devices

    Installing the Host Adapter and SCSI Devices This chapter explains how to physically install an AHA-3940U/ 3940UW/3940UWD host adapter in your computer and connect SCSI devices to it. You may need to run your computer’s Setup program as part of the installation process.

  • Page 23: Host Adapter Layout

    AHA-3940U/3940UW/3940UWD User’s Guide Host Adapter Layout Figure 2-1 identifies the major AHA-3940U components. Figure 2-2 identifies the major AHA-3940UW components. Figure 2-3 identifies the major AHA-3940UWD components. Following the figures, a table describes these components. Figure 2-1. AHA-3940U Components Figure 2-2. AHA-3940UW Components Figure 2-3.

  • Page 24: Inserting The Host Adapter In A Pci Slot

    AIC-7880 Controller—Channel A AIC-7880 Controller—Channel B PCI-to-PCI Bridge SEEPROM BIOS ROM 50-pin on AHA-3940U, 68-pin on AHA-3940UW/3940UWD only. See Appendix A, Multiple Computer Configuration. 68-pin on AHA-3940UWD only. Inserting the Host Adapter in a PCI Slot WARNING: Be sure the power is turned before you con- tinue.

  • Page 25: Inserting The Host Adapter

    AHA-3940U/3940UW/3940UWD User’s Guide your computer has. PCI bus slots are typically white or ivory and are shorter than ISA or EISA slots. Usually, there are three PCI slots. One of these may be a shared slot. A shared slot has connectors for both ISA and PCI, but can accept only one kind of board at a time.

  • Page 26: Connecting Scsi Cables And Devices

    Adaptec sells high-quality internal and external UltraSCSI and SCSI-2 cables. If your reseller does not stock these cables, call Adaptec directly at the number listed on page ii. Maximum Cable Lengths To assure reliable operation, the total length of the SCSI bus, includ- ing both internal and external cabling, should not exceed 6 meters (19.7 feet) for synchronous or asynchronous data transfer rates, and...

  • Page 27: Connecting Internal Scsi Devices

    SCSI devices to an AHA-3940U/3940UW/ 3940UWD host adapter, you need the following: A 50-pin internal SCSI ribbon cable for the AHA-3940U. (Or two cables, if you are using both internal SCSI connectors.) A 68-pin internal SCSI ribbon cable for the AHA-3940UW or AHA-3940UWD.

  • Page 28: Internal Scsi Ribbon Cable To Host Adapter

    Wide SCSI bus. Note: The following diagrams show the 50-pin internal con- nector used with the AHA-3940U. The AHA-AHA-3940UW and AHA-3940UWD use 68-pin high-density connectors. To connect internal SCSI devices, follow these steps: Plug the SCSI connector at one end of the SCSI ribbon cable into one of the host adapter’s internal SCSI connectors, as...

  • Page 29: Internal Scsi Ribbon Cable To Internal Scsi Device

    AHA-3940U/3940UW/3940UWD User’s Guide Plug the last connector on the ribbon cable into the SCSI con- nector on the internal SCSI device, as shown in Figure 2-7. Pin 1 Colored Stripe Internal SCSI Device Figure 2-7. Internal SCSI Ribbon Cable to Internal SCSI Device...

  • Page 30: Connecting External Scsi Devices

    Connecting External SCSI Devices You can daisy-chain up to seven external SCSI devices to Channel A of the AHA-3940U. You can daisy-chain up to fifteen external SCSI devices to Channel A of the AHA-3940UW or Channels A and B of the AHA-3940UWD.

  • Page 31: Connecting External 8-Bit And 16-Bit Devices (Aha-3940Uw Or Aha-3940Uwd)

    AHA-3940U/3940UW/3940UWD User’s Guide as shown in Figure 2-10. The AHA-3940UWD has two external connectors (not shown). External External SCSI Device SCSI Cable Figure 2-10. External Cable to External SCSI Device To connect other external SCSI devices, daisy chain each device to the previous device until all external SCSI devices have been connected, as shown in Figure 2-11.

  • Page 32: Terminating The Scsi Bus

    Terminating the SCSI Bus SCSI termination must be enabled on the first and last physical devices on SCSI Channels A and B of your AHA-3940U/3940UW/ 3940UWD host adapter; otherwise, the devices will not operate properly. You may need to change the termination setting on some SCSI devices when you install them.

  • Page 33: Terminating The Host Adapter

    Chapter 3, Configuring Your Host Adapter. The following section assumes that termination remains at Automatic. Terminating SCSI Channel A on the AHA-3940U/3940UW and Both Channels on the AHA-3940UWD These SCSI channels have an external connector and an internal con- nector, as shown on page 2-2.

  • Page 34: Terminating Scsi Channel B On The Aha-3940U/3940Uw

    Termination Figure 2-13. Internal and External Devices on SCSI Channel A Terminating SCSI Channel B on the AHA-3940U/3940UW This SCSI channel has an internal connector and no external connec- tor. The host adapter must always be at the end of the cable when you attach internal SCSI devices to this channel.

  • Page 35: Scsi Ids

    Enabled Automatically Termination Enabled Termination Figure 2-14. Host Adapter Termination on SCSI Channel B (AHA-3940U/3940UW) Note: Do not set a channel’s termination to Disable if there is no device on that SCSI bus. It may hang the system. SCSI IDs Each device on the SCSI bus, including the host adapter, must have a unique SCSI ID.

  • Page 36: Setting Scsi Ids

    If you have two host adapters connected to the same SCSI bus, make sure they are set to different SCSI IDs, preferably 7 and 6. Note: A computer with an AHA-3940U/3940UW/ 3940UWD host adapter can share external SCSI devices with another computer. To do this, you must install a jumper before you install the host adapter.

  • Page 37: Completing Installation

    AHA-3940U/3940UW/3940UWD User’s Guide Connect the LED cable to the SCSI activity LED connector on the host adapter, as shown in Figure 2-15. LED Cable Pin 1 LED Connector J4 Figure 2-15. SCSI LED Connector If the computer has a two-position LED cable, connect it to pins 1 and 2 of the LED connector.

  • Page 38: Running The Computer's Setup Program

    Chapter 5, Troubleshooting. Running the Computer’s Setup Program Normally, PCI-bus computers automatically configure the AHA-3940U/3940UW/3940UWD IRQ, port address, and BIOS address. In some cases, depending on what kind of motherboard BIOS your computer uses, you may need to run the computer’s Setup program to enable the PCI bus parameters before your com- puter can recognize the host adapter.
  • Page 39 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: 2-18 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 40: Configuring Your Host Adapter

    Configuring Your Host Adapter AHA-3940U/3940UW/3940UWD host adapters include an onboard SCSISelect configuration utility that lets you change host adapter set- tings without opening the computer or handling the host adapter. SCSISelect also provides utilities for formatting SCSI disk devices and scanning them for defects. In addition, SCSISelect allows you to list the SCSI IDs of devices attached to the host adapter.

  • Page 41: Default Configuration Settings

    AHA-3940UW/3940UWD only. Settings are only valid if channel BIOS is enabled. If this setting is changed to Enabled, the Maximum Sync Transfer Rates are 20 MBytes/sec for the AHA-3940U and 40 MBytes/sec for the AHA-3940UW/ 3940UWD. AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B...

  • Page 42: When To Use Scsiselect

    Starting SCSISelect To start SCSISelect, press Ctrl+A when the BIOS banner appears dur- ing bootup, as shown in Figure 3-1. Adaptec AHA-3940U/3940UW BIOS v1.22 (c) 1996 Adaptec, Inc. All Rights Reserved. Press <Ctrl><A> for SCSISelect(TM)Utility! SCSI ID #0 - MAXTOR P1-17S...

  • Page 43: Selecting A Scsi Channel

    Arrow keys to move cursor, <Enter> to select option, <Esc> to exit ( * =default) Figure 3-2. Selecting a SCSI Channel If there are two or three AHA-3940U/3940UW/3940UWD host adapters in your computer, this screen lists the channels on all the host adapters.

  • Page 44: Using The Options Menu

    Configuring Your Host Adapter After you select the channel, the SCSISelect Options menu appears, as shown in Figure 3-3. Adaptec AHA-3940 Ultra/ Ultra W SCSISelect(TM) Utility v1.22 AHA-3940 Ultra/Ultra W at Bus:Channel 01:A Would you like to configure the PCI device or run the SCSI disk utilities? Select the option and press <Enter>.

  • Page 45: Configure/View Host Adapter Settings

    AHA-3940U/3940UW/3940UWD User’s Guide Configure/View Host Adapter Settings From the Options menu, select Configure/View Host Adapter Settings to see the Configuration menu, shown in Figure 3-4. This menu lists the following settings under SCSI Channel Interface Definitions: Host Adapter SCSI ID: Change the SCSI ID of the channel from its default ID of 7.

  • Page 46: Host Adapter Scsi Id Selection Screen For Aha-3940Uw/3940Uwd

    The Host Adapter SCSI ID option on the Configuration menu lets you change the channel SCSI ID. The screen in Figure 3-5 shows the avail- able IDs for each channel on the AHA-3940U/3940UW/3940UWD. Adaptec AHA-3940 Ultra/Ultra W SCSISelect(TM) Utility v1.22...

  • Page 47: Scsi Parity Checking

    AHA-3940U/3940UW/3940UWD User’s Guide Follow these steps to select a different ID for a channel: Display the Configuration menu for the channel. Highlight Host Adapter SCSI ID, then press Enter. A menu of IDs appears. Highlight the ID you want to assign the channel, then press Enter.

  • Page 48: Host Adapter Scsi Termination

    Configuring Your Host Adapter Highlight SCSI Parity Checking, then press Enter. The pop-up menu shown in Figure 3-6 appears. Adaptec AHA-3940 Ultra/Ultra Wide SCSISelect(TM) Utility v1.22 AHA-3940 Ultra/Ultra W at Bus:Channel 01:A Configuration SCSI Channel Interface Definitions Host Adapter SCSI ID ........

  • Page 49: Boot Device Options

    <F6> - Reset to Host Adapter Defaults Arrow keys to move cursor, <Enter> to select option, <Esc> to exit ( * =default) Figure 3-7. Host Adapter SCSI Termination Selection for AHA-3940U/3940UW/3940UWD Highlight Enabled or Disabled, then press Enter. Boot Device Options This option configures parameters for a SCSI boot device.

  • Page 50: Scsi Device Configuration

    SCSI bus. When you choose this option for the AHA-3940UW/3940UWD, a screen similar to Figure 3-9 appears. For the AHA-3940U, the screen differs in the Maximum Sync Trans- fer Rate and the absence of Initiate Wide Negotiation.
  • Page 51 Maximum Sync Transfer Rate This setting determines the maximum synchronous data transfer rate that the channel can support. The AHA-3940U has a 8-bit channel that provides an effective maximum synchronous transfer rate of 20.0 MBytes/sec. The AHA-3940UW/3940UWD has a 16-bit channel that pro- vides an effective maximum synchronous transfer rate of 40.0 MBytes/sec (20.0 MBytes/sec per 8-bit channel).
  • Page 52 SCSI devices. If the channel connects to only one SCSI device, set Enable Disconnection to no to achieve slightly better performance. 3-13 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: 3-13 Print Spec Number: 494569-00...
  • Page 53 AHA-3940U/3940UW/3940UWD User’s Guide Initiate Wide Negotiation This setting, which appears only on AHA-3940UW/3940UWD host adapters, determines whether the channel initiates negotiation with the SCSI device for Wide SCSI data transfers. When set to yes for a SCSI device, the channel initiates Wide negotiation with the SCSI device.

  • Page 54: Advanced Configuration Options

    This option allos you to enable or disable the resetting of the SCSI bus by the host adapter at boot-up. Channel BIOS This setting enables or disables the host adapter BIOS. The default setting is Enabled. Each AHA-3940U/3940UW/3940UWD host 3-15 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B...
  • Page 55 AHA-3940U/3940UW/3940UWD User’s Guide adapter has one BIOS, which operates on both SCSI channels. The BIOS must be enabled if you want the computer to boot from a SCSI hard disk drive connected to either channel of the host adapter. Sev- eral SCSISelect options are only valid if the host adapter BIOS is enabled, as noted in the table on page 3-2.

  • Page 56: Saving Configuration Changes

    The default setting is Enabled. Support for UltraSCSI Speed This option allows you to enable or disable support for UltraSCSI speed. This is 20.0 MBytes for the AHA-3940U, and 40.0 MBytes for the AHA-3940UW/3940UWD. The default is Disabled. Saving Configuration Changes You save configuration changes as you exit SCSISelect.

  • Page 57: Scsi Disk Utilities

    MS-DOS fdisk and format . Most SCSI disk devices are preformatted and need not be formatted again. The Adaptec Format Disk utility is compatible with most SCSI disk drives. Run it on hard disk drives or removable-media drives that were previously used with a non-Adaptec host adapter.

  • Page 58: Verify Disk Media

    PCI bus. Refer to your computer documenta- tion to determine the PCI slot number and slot number order. If you are booting from a drive connected to an AHA-3940U/ 3940UW/3940UWD and you are using ISA/EISA-based host adapters to support secondary devices, disable the BIOS on all ISA/EISA-based host adapters.
  • Page 59 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: 3-20 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 60: Operating System Support

    SCSI tape drives, scanners, plotters, or WORM drives more than eight hard disk drives removable media, such as Bernoulli cartridges Adaptec EZ-SCSI Software Adaptec EZ-SCSI 4.0, for DOS/Windows, Windows 95, and ™ Windows NT , is a menu-driven applications suite that manages all your SCSI peripherals.

  • Page 61: Adaptec 7800 Family Manager

    UNIX, and UnixWare operating systems, is included with the AHA-3940U/3940UW/3940UWD host adapter package. For details on how to install and use the Adaptec 7800 Family Manager Set, refer to the Adaptec 7800 Family Manager Set User’s Guide. AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev.

  • Page 62: Troubleshooting

    SCSI bus. If you need more assistance after reading this troubleshooting information, see Adaptec Technical Support and Services on page ii. Answer these questions first if a problem occurs during installation:...

  • Page 63: Bios Startup Messages

    AHA-3940U/3940UW/3940UWD User’s Guide adapter. But you may need to assign some of these values man- ually in the Setup program. Is the host adapter’s IRQ or port address in conflict with any SCSI ID? Again, the PCI bus assigns IRQ, port address, and BIOS address settings automatically, but you may need to assign some of these values manually in Setup .

  • Page 64: Disk Drive Configuration Problems

    Channel A. (The BIOS Standard disk drive means a disk drive attached to the computer through a standard ISA/EISA, non-SCSI disk controller—for example, an IDE drive. AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: 5-3...

  • Page 65: Using A Standard Drive As C And A Scsi Drive As D

    AHA-3940U/3940UW/3940UWD User’s Guide always scans Channel A first.) See Boot Device Options on page 3-10 for more information. Check that there are no SCSI ID conflicts. Refer to the disk drive manual to learn how to set the drive’s SCSI ID. You can use SCSISelect to determine the SCSI IDs of devices on the SCSI bus, as described on page 3-18.

  • Page 66: Using Scsi Drives As C And D

    Is the adapter installed in a PCI slot that does not support bus mastering? See your computer documentation. AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: 5-5 Print Spec Number: 494569-00...

  • Page 67: Other Problems And Solutions

    The disk drive may be defective. Read the hardware documen- tation 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.
  • Page 68 I connected my computer’s LED cable to the host adapter. Now the light stays on all the time and my computer hangs. The red LED on the AHA-3940U/3940UW/3940UWD normally lights up when there is activity on the SCSI bus. If the light stays on when there is no activity on the bus, it may mean that the internal SCSI cables are reversed.
  • Page 69 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: 5-8 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 70: A Multiple Computer Configuration

    Multiple Computer Configuration Normally your AHA-3940U/3940UW/3940UWD SCSI bus configu- ration includes one host adapter installed in one computer, with one or more internal and/or external SCSI devices attached to each channel on the host adapter. However, two computers can share SCSI devices without changing the cable configuration every time one of the computers needs access to the devices.

  • Page 71: Scsi Devices Shared By Two Computers

    CD-ROM or internal SCSI drives, for example, in either computer. The Adaptec host adapter in the second computer does not have to be an AHA-3940U/3940UW/3940UWD, but it must be capable of active termination when it is turned off. Most Adaptec host adapters can be actively terminated;...

  • Page 72: B Optimizing Performance

    Optimizing Performance Read this appendix to find out how to optimize your computer’s performance and take full advantage of the AHA-3940U/3940UW/ 3940UWD advanced design features. Enabling Synchronous Negotiation Synchronous negotiation is a SCSI feature that allows the SCSI channel and its attached SCSI peripheral devices to negotiate for the transfer of data in synchronous mode on the SCSI bus.

  • Page 73: Enabling Wide Negotiation

    Enabling Wide Negotiation Wide Negotiation is enabled (set to yes) by default on the AHA-3940U/3940UW/3940UWD. For each 16-bit SCSI device con- nected to the host adapter, Wide Negotiation should normally be enabled to allow for 16-bit data transfer instead of 8-bit. See SCSI Device Configuration on page 3-11.

  • Page 74: Enabling Send Start Unit Command

    (Some older disk devices do not support this option and may mal- function if they receive the command.) The Send Start Unit Command has no effect if the channel BIOS is disabled. AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: B-3 Print Spec Number: 494569-00...
  • Page 75 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: B-4 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 76: C Disk Drives Over 1 Gbyte

    Disk Drives Over 1 GByte Extended Translation (Using MS-DOS 5.0) Adaptec host adapters have always supported the full range of disk drive capacities under all major operating systems. As disk drives have recently grown beyond 1 GByte in formatted capacity, they have run up against the DOS 1024-cylinder limit.

  • Page 77: When Not To Use Extended Translation

    AHA-3940U/3940UW/3940UWD User’s Guide Caution: Be sure to back up your disk drive before you change the translation method on a disk drive. All data is erased when you change from one translation scheme to another. When Not to Use Extended Translation...
  • Page 78 Index Booting with multiple host adapters 3-19 Bridge support 1-1, 5-1 Active Termination A-2 Adaptec 7800 Family Manager 4-2 Adaptec EZ-SCSI 4-1 Adaptec Services Cables information 1-8 See SCSI Cables support 1-8 CD-ROM 4-1, B-2 Advanced Configuration audio player utility 4-2...
  • Page 79 AHA-3940U/3940UW/3940UWD User’s Guide External SCSI Device, using with multiple computers A-2 EZ-SCSI LED Cable 2-15, 5-7 see Adaptec EZ-SCSI LED Connector 2-15 Logical Units, Support for Multiple 1-5 Low-level Format 3-18 Fast SCSI 3-13 Fdisk command C-2 Floptical 4-1 Format Disk Utility 3-18...
  • Page 80 Support Services 1-8 Synchronous Data Transfer Rate 3-12 Synchronous Negotiation B-1 System requirements 1-1, 1-3 Index-3 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: Index-3 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 81 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: Index-4 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 82 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: Index-5 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 83 AHA-3940U/3940UW/3940UWD User’s Guide Stock Number: 511041-00, Rev. B Page: Index-6 Print Spec Number: 494569-00 Current Date: 2/14/97 ECN Date: 2/17/97 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 84 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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