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1-6

AHA-2740W/2742W/2744W User’s Guide

AHA-2740W/2742W/2744W User’s Guide
Stock Number: 510647-00, Rev. A

Page: 1-6

Print Spec Number: 492897-00
Current Date: 8/3/94

ECN Date: 8/9/94

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Board Layout

Figure 1-1 shows the location of the major components on the
AHA-2740W and AHA-2742W; the table below provides a descrip-
tion of each component.

Location

Description

Floppy Enable Jumper (AHA-2742W Only)

External LED Connector

Floppy Connector (AHA-2742W Only)

16-bit Wide SCSI Channel Internal Connector

8-bit SCSI Channel Internal Connector

16-bit Wide SCSI Channel External Connector

Floppy Controller (AHA-2742W Only)

RAM

Host Adapter BIOS

U11

AIC-7770 Bus Master SCSI Chip

U12

AIC-701 Configuration Chip

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

Pin 1

U12

U11

Summary of Contents for AHA-2740W

Page 1: ...AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A User s Guide User s Guide AHA 2740W 2742W 2744W EISA to Fast Wide SCSI Host Adapters R ...

Page 2: ... A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A Adaptec Inc 691 South Milpitas Boulevard Milpitas CA 95035 Copyright 1993 1994 Adaptec Inc All rights reserved Adaptec and the Adaptec logo are registered trademarks of Adaptec Inc Printed in Singapore STOCK NO 5106...

Page 3: ...AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A R AHA 2740W 2742W 2744W EISA to Fast Wide SCSI Host Adapters User s Guide ...

Page 4: ...istered trademark of Unix System Laboratories All other product names are trademarks or registered trademarks of 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 om...

Page 5: ... 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 which can 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 ...

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Page 7: ...his Chapter 1 1 Overview 1 3 The AHA 2740W 2742W 2744W Host Adapters 1 3 Features 1 4 Fast Data Transfer Rates 1 4 Maximum Off loading the Host CPU 1 4 Fully Disk Array Capable 1 4 Advanced Fast SCSI 2 SCSI 3 Implementation 1 4 Multiple Device and Applications Support 1 5 Configuration Flexibility 1 5 Board Layout 1 6 Default Settings 1 8 The Onboard Floppy Controller AHA 2742W and AHA 2744W Only ...

Page 8: ...n External Connectors 2 14 50 pin and 68 pin Internal Connectors and 68 pin External Connector 2 15 SCSI ID Setting 2 15 Installing the Host Adapter 2 16 Cabling the Host Adapter 2 17 Connecting Standard 8 bit Internal SCSI Devices 2 17 Connecting 16 bit Internal Wide SCSI Devices 2 20 Connecting 16 bit External Wide SCSI Devices 2 22 Connecting Floppy Drives AHA 2742W and AHA 2744W Only 2 25 SCSI...

Page 9: ...2742W Only 3 11 BIOS and Device Configuration 3 11 BIOS Configuration 3 12 Device Configuration 3 13 Exit SCSI Device Configuration 3 18 Exit the EISA Configuration Utility 3 18 Utilities 3 18 Disk Format Utility 3 19 Disk Format 3 19 Disk Verify 3 19 4 Troubleshooting About This Chapter 4 1 SCSI Troubleshooting Checklist 4 3 Problems and Solutions 4 4 Conflicts With Other Options 4 6 A Specificat...

Page 10: ...ronic and Physical Interface A 11 Connector A 11 B I O Operating Environment About This Appendix B 1 Host Adapter Support B 3 DOS Windows B 3 Adaptec EZ SCSI B 4 C Optimizing Performance About This Appendix C 1 Performance Tips C 3 Enabling Synchronous Negotiation C 3 Enabling Wide Negotiation C 3 Disabling the Host Adapter BIOS C 4 Enabling SCSI Bus Parity C 4 Setting Enable Disconnection C 4 Sen...

Page 11: ... 11 2 4 Internal Wide SCSI Devices Only 2 12 2 5 External Wide SCSI Devices Only 2 12 2 6 Internal and External Wide SCSI Devices 2 13 2 7 Internal 8 bit SCSI Devices Only 2 13 2 8 Internal 8 bit and Internal Wide SCSI Devices 2 14 2 9 Internal 8 bit and External Wide SCSI Devices 2 14 2 10 50 pin SCSI Ribbon Cable to Host Adapter 2 19 2 11 50 pin SCSI Ribbon Cable to Internal SCSI Device 2 19 2 1...

Page 12: ...Floppy Drive 2 26 2 22 SCSI LED Connector 2 27 3 1 Host Adapter Parameters 3 4 3 2 Interrupt Level Selection 3 5 3 3 Bus Release Time Selection 3 6 3 4 Data FIFO Threshold Selection 3 6 3 5 Host Adapter BIOS Base Address Selection 3 7 3 6 Wide SCSI Channel Interface Definitions 3 8 3 7 Host Adapter SCSI ID Selection 3 9 3 8 SCSI Bus Parity Check Selection 3 9 3 9 SCSI Selection Timeout Selection 3...

Page 13: ...a tures board layout and default settings are included Chapter 2 Getting Started has the information needed to install the host adapter and SCSI devices Chapter 3 Configuring the Host Adapter describes the EISA configuration utility and how it is used to configure your host adapter The chapter also describes the utilities available through the EISA configuration utility Chapter 4 Troubleshooting h...

Page 14: ... feature which allows you to bypass the DOS 1024 cylinder limit and supports disk drives up to 8 Gigabytes GBytes in size Conventions The following typographic conventions are used throughout this document bold Used for keystrokes press the Enter key and screen selection fields select Backup Device and Helvetica Used for operator entry that must be typed exactly as shown device c adaptec aspidos s...

Page 15: ...es three types of advisories Note Text set off in this way presents remind ers tips or suggestions which may simplify the assembly and use of the host adapter Caution Failure to observe this type of advi sory could result in damage to your system devices and or data WARNING Failure to observe this type of advisory could result in personal injury Use caution when handling any electrical equipment A...

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Page 17: ...A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 1 1 1 Introduction About This Chapter Read this chapter to find out An overview of the AHA 2740W 2742W 2744W EISA to Fast SCSI host adapters The features of the AHA 2740W 2742W 2744W The layout of the host adapter and all its major components The default settings of the host adapt...

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Page 19: ...dapters The AHA 2740W 2742W 2744W provide a high performance con nection between the EISA Extended Industry Standard Architec ture bus and the Wide SCSI Small Computer System Interface bus The AHA 2740W 2742W 2744W is a bus master device that trans fers 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 me...

Page 20: ...ngle jumper J1 that is used to enable or disable the onboard floppy controller Features Fast Data Transfer Rates 16 bit Wide SCSI data transfer Up to 33 MBytes sec burst on EISA bus enabled by large 256 byte FIFO 4 0 MBytes sec asynchronous Wide SCSI data rate 10 0 MBytes sec synchronous Wide SCSI data rate 20 0 MBytes sec synchronous Fast Wide SCSI data rate Maximum Off loading the Host CPU Onboa...

Page 21: ...ndling in Data Message and Command phases Multiple Device and Applications Support The AHA 2740W 2742W 2744W can be used to install up to 15 SCSI devices The AHA 2742W can be used to install up to two floppy disk drives The AHA 2740W 2742W 2744W BIOS fully supports the extended partitioning capabilities of DOS 3 3 for up to two drives and DOS 5 0 and above for up to eight drives per host adapter T...

Page 22: ... A Board Layout Figure 1 1 shows the location of the major components on the AHA 2740W and AHA 2742W the table below provides a descrip tion of each component Location Description J1 Floppy Enable Jumper AHA 2742W Only J2 External LED Connector J3 Floppy Connector AHA 2742W Only J4 16 bit Wide SCSI Channel Internal Connector J5 8 bit SCSI Channel Internal Connector J6 16 bit Wide SCSI Channel Exte...

Page 23: ... A A A A A A A A A A Figure 1 1 shows the location of the major components on the AHA 2744W the table below provides a description of each component Location Description J1 Floppy Enable Jumper J2 External LED Connector J3 Floppy Connector J4 16 bit Wide Differential SCSI Channel Internal Connector J5 8 bit Differential SCSI Channel Internal Connector J6 16 bit Wide SCSI Channel External Connector...

Page 24: ...2744W Only The onboard floppy controller on the AHA 2742W and AHA 2744W is enabled by default and is controlled by jumper J1 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 exist...

Page 25: ...utor where you purchased the host adapter is responsible for any damage incurred during storage or shipment In case of damage return the host adapter to your distributor if the host adapter was delivered to you directly have the carrier note the damage on both the delivery receipt and the freight bill then notify the freight company representative so that the necessary insurance claims can be init...

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Page 27: ...AAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 2 1 2 Getting Started About This Chapter Read this chapter to find out An overview of the steps involved in installing your host adapter A brief discussion about your host adapter and the SCSI bus The instructions an experienced user can use to quickly install the host adapter The instructions...

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Page 29: ...ng the system For experienced users who are already familiar with SCSI and SCSI installation refer to Quick Installation on page 2 5 for instructions that allow you to get your host adapter up and running quickly If you are new to SCSI peripherals or if you have limited experience installing option boards in your computer refer to the more compre hensive instructions and illustrations found in Ins...

Page 30: ...rd bus the wires in a SCSI cable resemble transmission lines which can generate undesirable effects such as signal reflection and uneven loading of the line drivers To reduce these effects the SCSI bus must be properly terminated Termination on the SCSI bus is discussed in detail later in this chapter To identify each SCSI device s address and to determine its pri ority on the SCSI bus each SCSI d...

Page 31: ...st device and only the last device that will be connected to each SCSI connector on the host adapter The device connected at the end of each SCSI connector must have a set of resistors called terminators either installed or enabled All other SCSI devices installed between the last device and the host adapter must have their terminators either removed or disabled In addition termination on the host...

Page 32: ...t system documentation for details 3 To connect standard internal 8 bit SCSI devices use a 50 pin SCSI ribbon cable to connect the first SCSI device to the 50 pin connector on the host adapter Make sure to align pin 1 of the cable with pin 1 of the connectors on the host adapter and internal SCSI device To connect additional internal 8 bit SCSI devices you will need to obtain a 50 pin SCSI ribbon ...

Page 33: ...vices connected at any one time Connecting devices to all three connectors will result in an improperly ter minated SCSI bus The total number of SCSI devices that can be connected to the host adapter is 15 6 If you are using the floppy controller on the AHA 2742W and AHA 2744W connect one end of the 34 pin floppy ribbon cable to the floppy connector on the host adapter connect the other end to the...

Page 34: ...e host adapter parameters Installation This section is intended primarily for users who are new to SCSI peripherals or have limited experience in installing an option board in their computer system Note Experienced users may want to refer to Quick Installa tion on page 2 5 The comprehensive instructions in this section guide you through terminating the SCSI bus setting the SCSI ID installing the h...

Page 35: ...tors either removed or disabled In addition termination on the host adapter itself must be properly configured Most SCSI devices use a jumper or a switch located close to their SCSI connector s to control termination On some SCSI devices you will have to physically remove resistor module s Refer to the man ufacturer s documentation to determine how to enable or disable termination on your particul...

Page 36: ...Adapter for instructions The table below describes the possible con figurations for host adapter termination For the AHA 2744W host adapter termination is configured by installing removing the Resistor Networks RNs Figure 2 2 shows the location of the RNs on the AHA 2744W The following table describes the possible RN configurations Host Adapter Termination Devices Connected To Host Adapter Low Hig...

Page 37: ...330 ohm resistor will have a 330 or 331 included in the part number printed on the resistor and a 150 ohm resistor will have 150 or 151 Note When reinstalling resistors make sure to maintain pin 1 orientation as shown below 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 Install1 Remove Low High None From RN1 to RN12 OFF OFF ...

Page 38: ...A A A A 68 pin Internal Connector Only When only the 68 pin internal connector has SCSI devices con nected the last SCSI device must be terminated The host adapter low and high bytes must be set to ON 68 pin External Connector Only When only the 68 pin external connector has SCSI devices con nected the last SCSI device must be terminated The host adapter low and high bytes must be set to ON Figure...

Page 39: ...th the 68 pin internal and external connectors have SCSI devices connected the last SCSI device connected to each connector must be terminated The host adapter low and high bytes must be set to OFF 50 pin Internal Connector Only When only the 50 pin internal connector has SCSI devices con nected the last SCSI device must be terminated The host adapter low and high bytes must be set to ON Figure 2 ...

Page 40: ...the last SCSI device connected to each connector must be terminated The host adapter low byte must be set to OFF and the high byte set to ON 50 pin Internal and 68 pin External Connectors When both the 50 pin internal and 68 pin external connectors have SCSI devices connected the last SCSI device connected to each con nector must be terminated The host adapter low byte must be set to OFF and the h...

Page 41: ...ity on the bus during the Arbitration phase The Arbitration phase determines which device will own the bus when two or more devices simultaneously request to use it Note If any SCSI device is connected to the 50 pin internal SCSI connector the host adapter must be assigned a SCSI ID that ranges from 0 to 7 SCSI ID 7 is recommended When selecting the SCSI ID consider the following The default value...

Page 42: ...ice Refer to the SCSI device documen tation for information on changing the SCSI ID on other SCSI devices Installing the Host Adapter To install the host adapter in your EISA system the chassis cover must be removed and the motherboard exposed Always refer to your EISA system documentation for instructions on removing the chassis cover and adding option boards such as the AHA 2740W 2742W 2744W WAR...

Page 43: ... 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 provided that 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 Note Only single ended SCSI device...

Page 44: ...ly two of the three SCSI connectors on the AHA 2740W 2742W 2744W can have devices connected at any one time The total number of SCSI devices that can be connected to the host adapter is 15 Maintaining Pin 1 Orientation When connecting the 50 pin internal SCSI ribbon cables to both the host adapter and internal SCSI device s make sure that pin 1 orien tation is maintained throughout the bus Pin 1 o...

Page 45: ...AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 1 Connect one end of the 50 pin SCSI ribbon cable to the 50 pin internal SCSI connector on the host adapter 2 Connect the other end of the 50 pin SCSI ribbon cable to the SCSI connector on the internal SCSI device Figure 2 10 50 pin SCSI Ribbon Cable to Host Adapter 50 pin SCSI Ribbon Cable Pin 1 Inter...

Page 46: ... cable with enough connectors to accommodate all of your internal 8 bit SCSI devices Connecting 16 bit Internal Wide SCSI Devices 16 bit internal Wide SCSI devices use a 68 pin flat SCSI ribbon cable with P cable connectors and are connected to the host adapter in the same manner as standard 8 bit SCSI devices The cable has connec tors at each end and additional connectors attached in the middle O...

Page 47: ...AAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A Note Only two of the three SCSI connectors on the AHA 2740W 2742W 2744W can have devices connected at any one time The total number of SCSI devices that can be connected to the host adapter is 15 To connect internal Wide SCSI devices follow these steps 1 Connect one end of the 68 pin Wide SCSI ribbon cable t...

Page 48: ... on the internal Wide SCSI device 3 To connect two or more internal Wide SCSI devices to a SCSI bus obtain a 68 pin Wide SCSI ribbon cable with enough con nectors to accommodate all of your internal Wide SCSI devices Connect each Wide SCSI device to the additional connectors Connecting 16 bit External Wide SCSI Devices External devices are usually daisy chained to the host adapter This means that ...

Page 49: ...ernal Wide SCSI devices can be connected to the 68 pin external connector Note Only two of the three SCSI connectors on the AHA 2740W 2742W 2744W 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 conn...

Page 50: ...AAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 2 Connect the other end of the 68 pin external cable to either one of the SCSI connectors on the Wide SCSI device 3 To connect subsequent external Wide SCSI devices obtain additional external cables and chain each device to the previ ous device until all external SCSI devices have been connected Figure 2 17 68 pin External...

Page 51: ...nnector Up to two floppy diskette drives can be connected to the host adapter 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 When connecting your floppy drives make sure to maintain pin 1 orientation as previously described in Maintaining Pin 1 Orientation on page 2 18 Note The AHA 2742W and AHA 274...

Page 52: ...AAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 2 Connect the other end of the 34 pin floppy ribbon cable to the connector on the first floppy drive Drive A 3 To connect a second floppy drive plug the middle connector of the floppy ribbon cable to the connector on the second floppy drive Drive B Figure 2 20 34 pin Floppy Cable to First Floppy Drive Colore...

Page 53: ...e on the front panel If you connect your system s LED cable to the host adapter the LED will light to indicate data transfer on the SCSI bus Note If you connect your computer s LED to the host adapter the LED will no longer indicate non SCSI disk activity So you may not want to use this feature if you are running non SCSI disk drives To connect the SCSI bus LED connector follow these steps 1 Refer...

Page 54: ... and the host adapter 0 7 for stan dard 8 bit SCSI devices 3 The host adapter is firmly seated in the host computer s EISA slot 4 8 bit internal SCSI devices are connected to the host adapter with a 50 pin SCSI ribbon cable and that proper pin 1 orienta tion is maintained 5 16 bit internal Wide SCSI devices are connected to the host adapter with a 68 pin Wide SCSI ribbon cable 6 16 bit external Wi...

Page 55: ...A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 3 1 3 Configuring the Host Adapter About This Chapter Read this chapter to find out The steps involved in configuring your host adapter with the EISA configuration utility provided with your EISA system The host adapter parameters that can be configured The options available to configure the host ada...

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Page 57: ...d all option boards installed in your EISA system The ECU must be run every time an adapter card is physically added removed or moved The ECU operates on the information provided by the cfg configuration files and ovl overlay files that accompany the EISA system board and or adapter card Note Always refer to the documentation provided with your EISA system for instructions on adding and configurin...

Page 58: ...g new configuration files Select this option to copy the adp7771 cfg and the adp7770 ovl files from the host adapter diskette to either the bootable EISA configuration diskette or to the directory on your hard disk where the ECU is located If the configuration utility does not provide such an option use the DOS Copy command to copy these files Select the Host Adapter Once the configuration and ove...

Page 59: ... parameter Interrupt Level Select Interrupt Level to configure the interrupt channel IRQ used by the host adapter Figure 3 2 displays your choices The default setting is IRQ 11 Multiple AHA 2740W 2742W 2744W host adapters installed in your system can share the same IRQ however to increase system performance you may want to select a different IRQ for each host adapter installed Note The IRQ cannot ...

Page 60: ...o transfer data after being pre empted in Bus Master mode Figure 3 3 displays your choices The default setting is 44 BCLKS Normally 44 BCLKS is optimum however if multiple bus master cards are installed in the system you may want to lower the value to free the EISA bus sooner Data FIFO Threshold Select Data FIFO Threshold to configure the percentage used by the host adapter Figure 3 4 displays you...

Page 61: ... Host Adapter BIOS Base Address to configure the BIOS base address for the host adapter or to disable the host adapter BIOS Figure 3 6 displays your choices The default setting is a base address of D8000h When choosing the base address verify that there is no conflict with other devices using the same address often the configuration utility will notify you if there is a conflict Note The BIOS must...

Page 62: ... fol lowing screen Only one function displays and no other choices are available Host Adapter SCSI ID Select Host Adapter SCSI ID to configure the SCSI ID 0 15 setting for the host adapter Figure 3 7 displays your choices The default setting is 7 Note If any SCSI device is connected to the 50 pin internal SCSI connector the host adapter must be assigned a SCSI ID that ranges from 0 to 7 SCSI ID 7 ...

Page 63: ...I ID Setting on page 2 15 for additional information on SCSI ID SCSI Bus Parity Check Select SCSI Bus Parity Check to enable or disable SCSI bus parity checking on the host adapter Figure 3 8 displays your choices The default setting 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...

Page 64: ...nds 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 Select SCSI Bus Reset at Power on to enable or disable a SCSI bus reset generated by the host adapter during its power on initialization and after a hard reset Figure ...

Page 65: ...ost adapter Figure 3 11 displays your choices The default setting is ON for both the Low and High byte Host adapter termination is determined by which SCSI connectors on the AHA 2740W 2742W have SCSI devices connected Refer to Termination on the SCSI Bus on page 2 9 for configuration options BIOS and Device Configuration Select BIOS and Device Configuration to configure the BIOS and SCSI device op...

Page 66: ...orted by the BIOS The default setting is Boot Device Only The fol lowing choices are available Boot Device Only Only the removable media drive desig nated as the boot device will be treated as a fixed disk All Devices All removable media drives supported by the BIOS will be treated as fixed disk drives Disabled No removable drives will be treated as fixed disks In this situation software drivers a...

Page 67: ...s enabled the following translation schemes are used SCSI hard disks 1 GByte use a translation scheme of 64 heads 32 sectors per track SCSI hard disks 1 GByte use a translation scheme of 255 heads 63 sectors per track Note Enabling this option for operating systems that do not need extended translation e g NetWare 386 and UNIX can cause drive failure and or data loss Support More than Two Drives T...

Page 68: ...ting is yes In general disconnect should be allowed for the most efficient SCSI bus utilization and highest overall system performance If only one SCSI device is attached to the SCSI host adapter disconnects are not required for efficient SCSI bus utilization since only one SCSI device is using the SCSI bus A slight performance increase may be realized if disconnect is not allowed in this case due...

Page 69: ...ill initiate synchronous negotia tion with the SCSI device When set to no the host adapter will not initiate synchronous negotiation with the SCSI device The host adapter however will always respond to synchronous negotiation initiated from the SCSI device The default setting is yes If neither the host adapter nor the SCSI peripheral negotiate for synchronous data transfers all data transfers will...

Page 70: ... data transfer rates which may result in erratic behavior or a hang condition Initiate Wide Negotiation This option determines whether or not the host adapter will attempt 16 bit data transfer instead of 8 bit data transfer The default setting is yes When set to yes the host adapter BIOS attempts 16 bit data transfer When set to no the BIOS transfers data at 8 bits unless the SCSI device itself re...

Page 71: ...error message is displayed during bootup similar to the following Channel A Target 1 Device Not Found When set to no the BIOS does not attempt to display an error mes sage if the SCSI device is not found The default setting is no Send Start Unit Command This option which is supported by some SCSI devices determines whether or not the SCSI Start Unit Command SCSI command 1B is sent to the SCSI devi...

Page 72: ...I Device Configuration When configuration of SCSI devices is complete press Esc to Exit SCSI Device Configuration you will be prompted to either save or abandon device configurations as shown in Figure 3 15 Exit the EISA Configuration Utility Once the host adapter and SCSI devices are properly configured save and exit the ECU as instructed on the screen s menu The fol lowing section Utilities desc...

Page 73: ...s and or removable media drives from other manufacturers host adapters the Disk Format Utility should be run to low level format your drive Disk Format Your fixed disk media must be low level formatted before you can use your operating system s partitioning and file preparation commands such as MS DOS fdisk and format Most SCSI disk devices are preformatted and do not need reformat ting The Adapte...

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Page 75: ... AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A 4 1 4 Troubleshooting About This Chapter Read this chapter to find out How to use the troubleshooting checklist to diagnose problems that may occur when you install a host adapter in your system Problems you may encounter and how to fix ...

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Page 77: ...Adaptec Technical Support is included on page ii If a problem occurs during installation check the following items first 1 Be sure all SCSI peripheral devices are connected to power Connect internal peripherals to your computer s power sup ply plug external peripheral power cables into a grounded line power outlet Follow the instructions in the hardware documentation 2 Be sure all cables are prope...

Page 78: ...If your system has only SCSI disk drives check the following 1 Make sure your computer system s CMOS setup is set to No Drives Installed as is required for SCSI host adapters 2 Try setting the SCSI boot drive to SCSI ID 0 This is normally done by changing jumpers or switches on the drive On each SCSI bus SCSI devices must be set to a unique SCSI ID See SCSI ID Setting on page 2 15 3 Try disabling ...

Page 79: ...us Sense Key e g 06h Unit attention Additional Sense Code Additional Sense Code Qualifier You can probably determine from the Sense Key information both the cause of the problem and its solution The following are some of the more common Sense Key values and their meanings 02h Not ready The media is not ready to format Be sure that media is inserted in the drive and that the media is spun up 03h Me...

Page 80: ...do not need to disable termination on it If this is not possible contact the manufacturer about possible work arounds I installed my host adapter board at IRQ12 and it does not work properly What is wrong Another device such as a mouse may be using IRQ12 Change the adapter board s IRQ to the default value 11 or to some other value See Configure the Host Adapter Parameters on page 3 5 When I instal...

Page 81: ...A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A A 1 A Specifications About This Appendix Read this appendix to find out Technical specifications of the AHA 2740W 2742W 2744W EISA interface SCSI interface and floppy disk interface Pin assignments for the internal a...

Page 82: ...rrent Date 8 3 94 ECN Date 8 9 94 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A ...

Page 83: ...AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A Technical Information The basic technical specifications of the host adapter are described below If you need more detailed information contact Adaptec s Literature Hotline at the phone number listed on page iii Product Specifications Physical Dimensions Length 8 5 inches Width 0 625 inches Height 5 0 inches Standard ...

Page 84: ...Interface Electrical Interface These are the specifications listed in ANSI X3 131 1986 for single ended and differential operation Single ended Output Signals All signals use open collector or three state drivers Each signal driven by a SCSI device has the following output characteristics when measured at the SCSI device s connector Driver Output Signals VOL 0 volts minimum 0 4 volts maximum IOL 2...

Page 85: ... minimum Shall conform to EIA RS 485 ISO 8482 1982 TIA TR30 2 All differential drivers shall maintain the high output impedance during power up and power down cycles until the driver is enabled Differential Input Signals Each signal of a SCSI device shall have the following characteristics when measured at the SCSI device s connector including both receivers and passive drivers Maximum input capac...

Page 86: ...ternal SCSI connector must be an unshrouded 50 pin header compatible with unshielded Alternative 1 connector as spec ified in ANSI X3 131 1986 Table A 1 lists the pin assignments for the 50 pin single ended connector Table A 3 lists the pin assignments for the 50 pin differential connector 68 pin SCSI Connectors The 68 pin internal Wide SCSI connector is a high density unshielded Alternative 1 con...

Page 87: ...AAA AAAA AAAA A A A A A A A A A A A A A A A A Table A 1 Internal Connector Pin Assignments Pin Signal Name Pin Signal Name 1 Ground 2 DB 0 3 Ground 4 DB 1 5 Ground 6 DB 2 7 Ground 8 DB 3 9 Ground 10 DB 4 11 Ground 12 DB 5 13 Ground 14 DB 6 15 Ground 16 DB 7 17 Ground 18 DB P 19 Ground 20 Ground 21 Ground 22 Ground 23 Reserved 24 Reserved 25 Open 26 Term Power Fused 27 Reserved 28 Reserved 29 Groun...

Page 88: ...35 DB 12 Ground 2 3 4 36 DB 13 Ground 3 5 6 37 DB 14 Ground 4 7 8 38 DB 15 Ground 5 9 10 39 DB P1 Ground 6 11 12 40 DB 0 Ground 7 13 14 41 DB 1 Ground 8 15 16 42 DB 2 Ground 9 17 18 43 DB 3 Ground 10 19 20 44 DB 4 Ground 11 21 22 45 DB 5 Ground 12 23 24 46 DB 6 Open 13 25 26 47 DB 7 Ground 14 27 28 48 DB P Ground 15 29 30 49 Ground Ground 16 31 32 50 Ground Term Power 17 33 34 51 Term Power Term P...

Page 89: ...AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A Table A 3 Differential Contact Assignments for A cable Pin Signal Name Pin Signal Name 1 Ground 2 Ground 3 DB 0 4 DB 0 5 DB 1 6 DB 1 7 DB 2 8 DB 2 9 DB 3 10 DB 3 11 DB 4 12 DB 4 13 DB 5 14 DB 5 15 DB 6 16 DB 6 17 DB 7 18 DB 7 19 DB P 20 DB P 21 Diffsens 22 Ground 23 Reserved 24 Reserved 25 Term Power 26 Term Power 27 Reserved 28 Reserve...

Page 90: ...r Signal Name DB 12 1 1 2 35 DB 12 DB 13 2 3 4 36 DB 13 DB 14 3 5 6 37 DB 14 DB 15 4 7 8 38 DB 15 DB P1 5 9 10 39 DB P1 Ground 6 11 12 40 Ground DB 0 7 13 14 41 DB 0 DB 1 8 15 16 42 DB 1 DB 2 9 17 18 43 DB 2 DB 3 10 19 20 44 DB 3 DB 4 11 21 22 45 DB 4 DB 5 12 23 24 46 DB 5 DB 6 13 25 26 47 DB 6 DB 7 14 27 28 48 DB 7 DB P 15 29 30 49 DB P Diffsens 16 31 32 50 Ground Term Power 17 33 34 51 Term Powe...

Page 91: ...AA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A Floppy Disk Interface Standard Electronic and Physical Interface Connector The floppy disk interface connector should be an unshrouded 34 pin header Driver Output Signals VOL 0 volts minimum 0 5 volts maximum VOH Open collector 5 25 volts maximum IOL 60 mA IOH 0 1 mA Receiver Input Signals VT 1...

Page 92: ...rrent Date 8 3 94 ECN Date 8 9 94 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A ...

Page 93: ... AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A B 1 B I O Operating Environment About This Appendix Read this appendix to find out If embedded support for your host adapter is available with your operating system Whether or not you need additional soft ware for your host adapter in the DOS Windows environment Information on Adaptec s...

Page 94: ...rrent Date 8 3 94 ECN Date 8 9 94 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A ...

Page 95: ...e for I O Operating Environment Software support Note Until embedded support is provided for your particu lar operating system host adapter drivers for the AHA 2740W 2742W 2744W may be available from Adaptec To order Adaptec software call the number for ordering Adaptec software listed on page iii DOS Windows Under MS DOS 5 0 or higher up to seven SCSI hard disk drives per host adapter eight total...

Page 96: ...configures your operating environment automatically Adaptec EZ SCSI has a number of utility programs including afdisk and scsifmt which are used to partition and format SCSI disk devices Adaptec EZ SCSI also includes an ASPI device driver called aspicd that supports most models of CD ROM drives and the aspidisk device driver which supports up to 24 fixed disk devices To install support for SCSI de...

Page 97: ...AAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A C 1 C Optimizing Performance About This Appendix Read this appendix to find out How to optimize your system s perfor mance after installing the host adapter ...

Page 98: ...rrent Date 8 3 94 ECN Date 8 9 94 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A ...

Page 99: ...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 Synchronous Negotiation and may malfunction if they receive a request for it you may want to disable Synchronous Nego tiation for that particular device See Device Configuration on page 3 13 Note Even when Synch...

Page 100: ... so SCSI Bus Parity Check is normally Enabled by default To use this option most effectively be sure that it is enabled on each SCSI device as well as on the host adapter To enable dis able SCSI Bus Parity Check on the host adapter See SCSI Bus Parity Check on page 3 9 Consult your hardware documentation for instructions on enabling parity checking on peripherals Note The only time when you should...

Page 101: ...or jumper settings on the device to enable the option To enable disable Send Start Unit Command See Device Configuration on page 3 13 Try enabling Send Start Unit Command for one peripheral at a time rebooting each time to make sure each SCSI device works properly Some older disk devices do not support this option and may mal function if they receive the command Note The Send Start Unit Command ha...

Page 102: ...rrent Date 8 3 94 ECN Date 8 9 94 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A ...

Page 103: ... A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A D 1 D Disk Drives Over 1 GByte About This Appendix Read this appendix to find out An overview of extended translation and the DOS 1 GByte limit When to use the extended translation feature Questions and answers ab...

Page 104: ...rrent Date 8 3 94 ECN Date 8 9 94 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A A A A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A ...

Page 105: ...W 2742W 2744W 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 To enable this feature refer to BIOS Configuration on page 3 12 The DOS 1 GByte Limit All versions of DOS are limited to 1024 cylinders per drive The stan dard translation scheme for SCSI host adapters using 64 heads and 32 s...

Page 106: ...uld The cylinder size increases to 8 MBytes when you enable extended translation The size of the parti tion you request must therefore be a multiple of 8 MBytes If you request a partition size that is not a multiple of 8 MBytes fdisk will round up to the nearest whole multiple of 8 MBytes Questions and Answers About Extended Translation What happens if I enable extended translation with SCSI drive...

Page 107: ...ables host adapters and device drivers to share a single SCSI hardware interface ASPI Manager A software module that pro vides an interface between ASPI modules a host adapter board and the SCSI devices connected to the adapter A single ASPI manager can handle multiple I O requests from multiple ASPI modules ASPI managers are written for a specific operating system such as DOS OS 2 or NetWare and ...

Page 108: ... multitasking oper ating systems The AHA 2740W 2742W 2744W host adapters use bus mastering Byte An 8 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 C CCB See Command Control Block CCS See Common Command Set CDB See Command Descriptor Block Command Control Block A software object prepared by the host microcomputer soft ...

Page 109: ...ion it auto matically sequences the required data transfer and provides the necessary address information Disconnect Reconnect Disconnect is the function that occurs when a target releases control of the SCSI bus allowing the bus to go to the Bus Free phase Reconnect is the function that occurs when a target selects an initiator to continue an opera tion after a disconnect DMA See Direct Memory Ac...

Page 110: ...rage needed to hold one character H Host A microcomputer system in which a host adapter is installed The host uses software to request the services of the host adapter in transferring informa tion to and from peripheral devices attached to the SCSI host adapter Host Adapter A printed circuit board or inte grated circuit that installs in a standard microcomputer sys tem and provides a SCSI bus conn...

Page 111: ... physical or virtual device addressed through a target Each target can have up to eight Logi cal Units Logical Unit Number An encoded 3 bit identifier for a logical unit LU See Logical Unit LUN See Logical Unit Number M Manager See ASPI Manager MByte Megabyte A measure of com puter storage One MByte equals 1 048 576 bytes A byte is the amount of storage needed to hold one character Micro Channel A...

Page 112: ...med Input Output A method of data transfer in which the host microprocessor transfers data to and from mem ory via the computer s I O ports PIO enables very fast data transfer rates especially in single tasking operating systems like DOS R RAM Random Access Memory Mem ory of which any byte can be accessed directly in a single memory cycle Information can be read from and written to the memory ROM ...

Page 113: ...ing to the electrical characteristics of the signals used on the SCSI bus interface Single ended signals occupy a single conductor and are refer ences to a common ground car ried on the cable between the SCSI components attached Most SCSI devices use single ended grounding Some SCSI devices use a differen tial grounding scheme These devices are not supported by the AHA 2740W 2742W Differen tial de...

Page 114: ...asing performance Target or Target Device A SCSI device that performs an operation requested by an initia tor The target may be a periph eral device such as a disk drive performing a service for an initi ator The target may also be a host adapter performing a processor type device service for an initiator Termination A physical requirement of the SCSI bus The devices at the physical ends of the SC...

Page 115: ...8 3 13 D 1 include in BIOS scan 3 16 partitioning support 1 5 removable disk drive 3 12 3 17 support for more than two drives 3 13 Board layout 1 6 1 7 Boot device 1 8 4 4 Booting your system 3 17 C 4 Burst rate 1 3 Bus see SCSI bus Bus clock 3 6 Bus master 1 3 1 4 2 4 2 6 2 16 Bus release time 1 8 3 6 C Cables cabling the host adapter 2 17 external Wide SCSI 2 4 2 7 2 23 floppy cable 2 7 2 25 int...

Page 116: ... 2 8 3 4 EISA configuration utility 1 4 2 7 2 10 2 16 3 3 3 18 4 4 EISA slot 2 4 2 6 2 8 2 16 3 4 Enable disconnection 3 14 C 4 Error if device not found 3 17 Extended translation 1 8 3 13 D 1 D 4 EZ SCSI see Adaptec EZ SCSI F Fdisk command D 4 Features 1 4 FIFO 3 6 Floppy disk drive A 11 cable 2 25 connector 1 6 1 7 2 7 2 8 2 17 controller 1 4 1 6 1 7 2 7 disabling the drive 1 8 DMA channel 2 25 ...

Page 117: ...s D 4 Performance tips C 3 PhaseEngine 1 3 Power requirements A 3 R RAM 1 6 1 7 Removable disk drive 1 8 3 12 3 17 4 5 see also Hard disk drive see also SCSI device Reset at power on 1 8 3 10 Resistor modules 2 9 S SCSI bus 1 3 2 4 3 9 3 14 parity 1 8 3 9 C 4 reset at power on 1 8 3 10 SCSI ID 2 5 2 15 selection timeout 1 8 termination 1 8 2 4 2 9 3 11 SCSI chip 1 6 1 7 SCSI device 2 4 3 16 B 3 8 ...

Page 118: ...AA AAAA AAAA AAAA AAAA AAAA AAAA AAAA A A A A A A A A A A A A A A A A AHA 2740W 2742W 2744W User s Guide Index 4 T Task scheduling 1 4 Termination see SCSI termination Transfer rate see Data transfer Translation schemes 3 13 Troubleshooting 4 1 4 3 U Unpacking and inspecting 1 9 Utilities 3 18 Adaptec EZ SCSI B 4 disk format 3 19 4 4 low level format 3 19 4 4 4 5 D 1 W Wide negotiation 3 16 Wide S...

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