CLASS B EQUIPMENT


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 installation.  This equipment generates, uses, and can 
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 harmful interference 
to radio or television reception, which can be determined by turning the 
equipment off and on, the user is encouraged to try to correct the 
interference by one or more of the following measures:

o       Reorient or relocate the receiving antenna
o       Increase the separation between the equipment and receiver
o       Connect the equipment into an outlet on a circuit different than 
        that to which the receiver is connected.
o       Consult the dealer or an experienced radio or television technician 
        for help.

Modifications

The FCC requires the user to be notified that any changes or modifications 
made to this device that are not expressly approved by BusTek Corporation 
may void the user's authority to operate the equipment.

Cables

External connections to this device must be made with shielded cables with 
metallic RFI/EMI connector hoods in order to maintain compliance with FCC 
Rules and Regulations.


MODIFICATIONS TO PRODUCT DESIGN

The material in this manual is for information only and is subject to change 
without prior notice to its users.  BusTek Corporation reserves the right to 
make changes in the product design without notice to its users.

TABLE OF CONTENTS

Unpacking and Inspection

Installation Tools

Configuration Instructions
        General
        BT-542 Switch and Jumper Settings
        BT-542B Specific Switch and Jumper Settings
        BT-542S and BT-542D Specific Switch and Jumper
        Settings
        Summary of BT-542 Switch and Jumper Settings

Installing the BT-542

Host Adapter Integration
        Device Termination
        Cabling Requirements
        SCSI Device ID Selection

Hard Disk Initialization
        Set-up, Initialization, and 
           Partitioning Procedure

Warranty Information

APPENDIX A.  BT-542 INTERNAL DIAGNOSTICS


LIST OF FIGURES
        1.  BT-542B Host Adapter Board
        2.  BT-542S and BT-542D Host Adapter Board
        3.  SCSI Terminator Configurations
TABLE OF CONTENTS (CONT'D)

LIST OF TABLES
    1.  BT-542 Host Adapter SCSI ID Setting
    2.  BT-542 Host DMA Channel
    3.  BT-542 I/O Port Base Addresses
    4.  BT-542 Host Interrupt Channel
    5.  BT-542 Host Interrupt Channels
    6.  BT-542B BIOS Base Addresses
    7.  BT-542B DMA Transfer Speed
    8.  BT-542S and BT-542D DMA Transfer Speeds
    9.  BT-542S and BT-542D BIOS Base Addresses
    10.  Summary of the BT-542's Switch Settings
    11.  Summary of the BT-542's Jumper Settings


PREFACE

AUDIENCE

This manual is intended for individuals who will be installing and 
configuring the BusTek BT-542 host adapter board in a PC/AT host system.  

SCOPE

This manual contains the information an individual needs to unpack, to 
install, and to configure the BT-542 in a PC/AT host system.

CONTENTS

The information in this manual is divided into one main section and an 
appendix:
o The body of the manual contains the installation and configuration 
  instructions.

o Appendix A discusses the BT-542's internal diagnostics.

RELATED PUBLICATIONS
o BusTek's PC/AT SCSI Host Adapter BT-542B Data Sheet.

o BusTek's PC/AT SCSI Host Adapter BT-542S/BT-542D Data Sheet.

o BusTek's PC/AT SCSI Host Adapter BT-542 Technical Reference Manual.

o The PC/AT installation and set-up guide.

o The operating system installation and user's guide.

o IBM's PC/AT technical reference manual (optional).

o The installation guide for the third-party device drivers (optional).

o Small Computer System Interface, ANSI X3.131-1986 American National 
       Standards (optional).

NOTATIONAL CONVENTIONS

The following conventions are used throughout this manual:

       BT-542                  the term used to refer inclusively to the                                       
                                BT-542B, BT-542S, and BT-542D boards.


INSTALLATION GUIDE

This section describes how to unpack, to inspect, to configure, and to install 
the BusTek BT-542B, BT-542S, and BT-542D host adapter boards in a PC/AT host 
system.  It also describes how to initialize the software for operation in 
DOS systems.

The BT-542B supports single-ended SCSI drives with asynchronous and 
synchronous data rates of up to 5 MBytes/sec.  The BT-542S supports single-
ended SCSI drives with asynchronous data rates of up to 7 MBytes/sec and 
synchronous data rates of up to 10 MBytes/sec with the proper termination and 
cabling.  The BT-542D supports differential SCSI drives with asynchronous 
data rates of up to 7 MBytes/sec and synchronous data rates of up to 10 
MBytes/sec.  

Throughout this manual the term "BT-542" refers collectively to the 
BT-542B, BT-542S, and BT-542D.


Unpacking and Inspection

Before handling the BT-542 make sure your body is grounded with a grounding 
strap. Touch your computer on a metal part to discharge static electricity 
before handling the board. The board should always be held by the edges after 
static electricity is discharged.

While practicing appropriate anti-static precautions remove the BT-542 from 
its protective envelope. Check that your shipment is complete according to 
the accompanying shipping list. Then verify that no physical damage occurred 
during shipping by inspecting the board for bent pins, loose parts, broken 
traces, and chipped or broken connectors.


Installation Tools

The following items, available from any authorized dealer, may be needed to 
assist with the installation of the BT-542 for your system:

o       PC/AT technical manuals
o       Hard disk drive(s) manuals 
o       Floppy disk drive(s) manuals
o       PC/AT DOS diskette(s)
o       SETUP, FDISK, and FORMAT programs
o       Small screwdriver
o       Small needle-nosed pliers.


Configuration Instructions

General

The BT-542 must be configured for use by performing the following actions:

o       Setting on-board switches and jumpers
o       Configuring SCSI devices
o       Verifying that the terminators are installed correctly
o       Placing the BT-542 into the AT slot and
o       Cabling the on-board connector to a SCSI target.

BT-542 Switch and Jumper Settings

The BT-542 operates with most AT class PCs with the factory set jumpers and 
switches in the two switch bays. The BT-542's switch bay settings and jumpers 
will need to be changed if conflicting port assignments or memory allocation 
is encountered. The locations of these switches and jumpers for the BT-542B 
are shown in Figure 1. Figure 2 shows the locations of these switches and 
jumpers for the BT-542S and the BT-542D.

The default settings for switches and jumpers for the BT-542B, BT-542S, and 
BT-542D as shipped from the factory are listed in Tables 1-5. 

For switch and jumper information that is specific to the BT-542B, refer to 
the heading "BT-542B Specific Switch and Jumper Settings" later in this 
manual.  For switch and jumper information that is specific to the BT-542S 
and BT-542D, refer to the heading "BT-542S/BT-542D Specific Switch and Jumper 
Settings" later in this manual.  For a summary of the BT-542 switch and jumper 
information, refer to Table 10 and 11.

Before installing the BT-542, verify that the switch settings and jumpers 
have been set according to the target system's operating requirements. 

WARNING
Change the switches and jumpers before installing the BT-542 board into 
the AT compatible computer. Make sure that you are properly grounded before 
doing so.

Host Adapter SCSI ID (BT-542). Switch Bay 1's Switches 1, 2 and 3 set the 
BT-542 SCSI Address (in binary). The default SCSI ID is 7. Complete settings 
of Switches 1, 2 and 3, and the resulting SCSI ID are shown in Table 1. The 
BT-542's BIOS requires that your SCSI drives be configured for SCSI ID 0 or 1. 
This requirement is important only if you intend to boot your system from the 
BT-542.

SCSI Parity (BT-542). Switch Bay 1's Switch 4 sets the SCSI bus parity check. 
The default setting is on, parity enabled. Setting Switch 4 to off disables 
the SCSI bus parity.

 Enable > 1 GB Support (Revision 'G' and above of the BT-542). To support 
 this  >1 GB feature, Switch Bay 1's Switch 5 has been re-defined.  For 
 revision 'F' and below, Switch Bay 1's Switch 5 is used to enable/disable 
 "SCSI Auto Sense."  (The default ON setting enables the SCSI Auto Sense 
 function for revision 'F' and below.)  For revision 'G' and above, this 
 switch is used to enable/disable > 1 GB support. 

For Revision 'G' and above by default  the >1 GB support option is disabled.  
To enable this option, you must set the BT-542's Switch Bay 1's Switch 5 to 
"0" (OFF).  After you have enabled this > 1 GB feature, the host adapter can 
support up to seven SCSI disk drives with each drive up to 8 GB in capacity. 

Example of the >1 GB Support - If a disk drive is more than 1GB but less than  
2 GB in capacity, you should set the host adapter  for >1 GB support.  If you 
were to run FDISK, it will display half of the cylinder count of the total 
drive capacity because now the disk is formatted as 2 MB per cylinder. 
                         
                        <1 GB         >1 GB           >2 GB             >4 GB

  Sectors Per Track      32            32              32                63
         
  Number of Heads      H=64            128             256               256
          
  Capacity Per         C=1 MB          2 MB            4 MB              8 MB
  Cylinder

          
SCO UNIX  Limitations - Disk capacity cannot exceed 1 GB due to the SCSI 
device driver that is built into SCO UNIX.   

Novell Limitations - Novell NetWare will support greater than 1 GB on the 
disk drive if the BIOS on the host adapter is disabled, and you are booting 
from another device.  This enables NetWare to use the entire disk drive as a 
NetWare volume.  If the BIOS is enabled and you are booting from a DOS 
partition, then there is a 1 GB limit.  This limitation is due to the fixed 
parameters in the NetWare SCSI device driver.

SCSI Synchronous Negotiation (BT-542).  The default setting of 
Switch Bay 1's Switch 6 is the on position which disables synchronous 
negotiation initiation by the BT-542. This mode assumes that a SCSI target 
device connected to the BT-542 will initiate the synchronous negotiation. 
Some target devices require that they initiate the synchronous transfer 
sequence. Such devices may fail to respond to commands from the BT-542 if a 
synchronous negotiation occurs unexpectedly.

Conversely, other target devices may expect an initiator to begin the 
synchronous negotiation sequence. If this class of SCSI target devices 
is connected to the BT-542, Switch 6 may be set to the off position 
to allow the BT-542 to initiate the negotiation for a synchronous data 
transfer with a selected SCSI target device.      

Host AT DMA Channel (BT-542). Switch Bay 1's Switches 7 and 8 default on 
settings select the DMA Channel 5 for data transfer to the PC/AT host. The 
DMA channel which is reported to the PC/AT host at the Inquire Configuration 
command is set by these switches. Complete  settings of Switches 7 and 8 are 
shown in Table 2.
     
    Switch Bay 2   Switch Bay 1
     __________    __________
 off| ........ |  | ........ | off      
 on | ........ |  | ........ | on       
    | 12345678 |  | 12345678 |          
    |__________|  |__________|
     ________ ____________________            _______
    | Switch |     DMA STATUS     |          | 0=ON  |
    | Bay 1  |                    |          | 1=OFF |
    | 7  8   |                    |          |_______|
    |________|____________________|
    | 0  0   | Channel Disabled   |
    | 1  0   | Channel 7          |
    | 0  1   | Channel 6          |
    | 1  1   | Channel 5, default |
    |________|____________________|
    
    Table 2. BT-542 Host DMA Channel


I/O Port Base Address (BT-542). Switch Bay 2's Switches 1, 2, and 3 select 
the starting address of the block of four I/O ports required by the BT-542. 
The default  starting address is 330H. Optional settings of the starting-
address switches, 1-3,  and their  corresponding Hex starting addresses are 
shown in Table 3. 
   
    _____________________________      ______
   | Switch  | I/O ADDRESS       |    | 0=ON | 
   | Bay 2   |                   |    | 1=OFF|
   | 1 2 3   | FUNCTION          |    |______|
   |---------|-------------------|
   | 0 0 0   | Reserved          |
   | 1 0 0   | 134h-137h         |
   | 0 1 0   | 234h-237h         |
   | 1 1 0   | 334h-337h         |
   | 0 0 1   | Reserved          |
   | 1 0 1   | 130h-133h         |
   | 0 1 1   | 230h-233h         |
   | 1 1 1   | 330h-333h,Default |
   |_________|___________________|

   Table 3. BT-542
   I/O Port Addresses


Host AT Interrupt Channel (BT-542). Default Switch Bay 2's 
Switches 6-8 select the host AT interrupt Channel 11. Complete settings of 
Switches 6 through 8 are given in Table 4.

In addition to setting the switch bay for the correct interrupt, make sure 
that you also set Jumpers W3-W8, as described as follows.

   
    _____________________        ______________________   _______
   | Switch | CHANNEL    |      | Jumper | HOST        | | 0=ON  |
   | Bay 2  |            |      |        | INTERRUPT   | | 1=OFF |
   | 6 7 8  |            |      |        | CHANNEL     | |_______|
   |---------------------|      |--------------------  |
   | 0 0 0  | Reserved   |      |  W3    | 15          |
   | 1 0 0  | Reserved   |      |  W4    | 14          |
   | 0 1 0  | 15         |      |  W5    | 12          |
   | 1 1 0  | 14         |      |  W6    | 11, Defualt |
   | 0 0 1  | 12         |      |  W7    | 10          |
   | 1 0 1  |  9         |      |  W8    |  9          |
   | 0 1 1  | 10         |      |______________________|
   | 1 1 1  | 11,Default |
   |________|____________|       Table 5. BT-542
                                 Host Interrupt Channels
   Table 4. BT-542
   Host Interrupt Channel


Host Interrupt Channel (BT-542). Jumpers W3-W8 set the Host Interrupt Channel. 
To configure the Host Interrupt Channel properly ensure that the corresponding 
switches in Switch Bay 2 (6,7,8) match the jumper settings shown in Table 5. 
Only one jumper must be shorted (installed) for proper operation.

Host I/O Channel Ready Enabled (BT-542). Jumper W17 controls the Host I/O 
Channel Ready function. The default setting for the jumper is "A-B" which 
enables the I/O Channel Ready signal; thereby,  allowing the BT-542 to 
respond to I/O devices (memory or I/O) that require a data transfer cycle to 
be lengthened. The BT-542 will wait until the I/O Channel Ready signal is 
returned to the Ready (high) state.

Setting "B-C" disables the I/O Channel Ready signal. When the I/O Channel 
Ready signal is disabled, it prohibits the BT-542 from responding to the I/O 
Channel Ready signal. This may be necessary if another I/O device does not 
properly manipulate the I/O Channel Ready signal.

Floppy PRIMARY/SECONDARY I/O Address (BT-542). The default setting for Jumper 
W14 (open) produces a primary floppy disk address of 3FX. The secondary 
address of 37X is set when the jumper is shorted.

Floppy Disk Controller Enable (BT-542). Default jumper settings of W15 and 
W16 closed allows the floppy disk controller to respond to host Read and 
Write commands. When both Jumpers W15 and W16 are open, the floppy disk 
controller will disregard any Read or Write signal.

Not Used or Reserved Jumpers. Reserved Jumpers W2 and W9, which select PROM 
sizes, are set at the factory.

BT-542B Specific Switch and Jumper Settings

This section describes the switch and jumper settings that are specific to 
the BT-542B.

ROM BIOS Base Address (BT-542B only). Switch Bay 2's Switches 4 and 5 select 
the block of address space reserved for the starting address of the BT-542B's 
BIOS. Complete settings of Switches 4 and 5, including the default setting 
(0DC000H), are shown in Table 6. If more than one host adapter is installed 
in the same system, only one may have the BIOS enabled. The BIOS on each 
additional host adapter must be disabled. Rather than using Switch Bay  2's 
Switches 4 and 5 to define the BIOS base address,  the BT-542S and BT-542D 
use Switch Bay 3's Switches 3,4, and 5.  For more details, refer to Table 9 
under the next heading, "BT-542S and BT-542D Specific Switch and Jumper 
Settings".
                             
    Switch Bay 2   Switch Bay 1
     __________    __________
 off| ........ |  | ........ | off      
 on | ........ |  | ........ | on       
    | 12345678 |  | 12345678 |          
    |__________|  |__________|
     ________ ____________________
    | Switch |     BIOS           |
    | Bay 2  |     ADDRESS        |
    | 4  5   |                    |     ______
    |________|____________________|    | 0=on |
    | 0  0   | 0C8000h            |    | 1=off|
    | 1  0   | Disable            |    |______|
    | 0  1   | 0D8000h            |
    | 1  1   | 0DC000h, default   |
    |________|____________________|
    
     Table 6. BT-542 Bios Base Address

DMA Transfer Speed (BT-542B only). Jumper settings for W11 and W13 determine 
the DMA transfer speed after a hard reset or power on. A Set Bus Transfer 
Rate host software command may be issued to the BT-542B to override these 
jumpers until the next hard reset or power on. The default setting is W11 and 
W13 removed (open). Table 7 shows the DMA transfer rate settings.

The BT-542S and the BT-542D do not have W11 and W13. Instead Switches 1 and 2 
of Switch Bay 3 are used to specify the DMA transfer speed. 

   _____________________________
  | JUMPER  | HOST BUS TRANSFER |
  | W11 W13 | RATE              |     ______
  |---------|-------------------|    | 0=ON |
  | 0   0   | 5.0 MB/sec        |    | 1=OFF|
  | 0   1   | 5.7 MB/sec        |    |______|
  | 1   0   | 6.7 MB/sec        |
  | 1   1   | 8.0 MB/sec        |
  |_________|___________________|
  
   Table 7. BT-542B DMA Transfer Speed

For more details on the BT-542's and BT-542D's DMA transfer speed,  refer to 
Table 8 under the next heading  "BT-542S and BT-542D Specific Switch and 
Jumper Settings". BT-542S and BT-542D Specific Switch and Jumper Settings
   _____________________________
  | Switch  | HOST BUS TRANSFER |  ______
  | Bay 3   | RATE              | | 0=on |
  | 1   2   |                   | | 1=off|
  |---------|-------------------| |______|
  | 0   0   | 5.0 MB/sec        |
  | 0   1   | 5.7 MB/sec        |
  | 1   0   | 6.7 MB/sec        |
  | 1   1   | 8.0 MB/sec        |
  |_________|___________________|
  
   Table 8. BT-542B DMA Transfer Speed

DMA Transfer Speeds (BT-542S and BT-542D only).  Instead of using W11 and W13 
to select the data transfer rate on the PC/AT bus, the BT-542S and BT-542D 
use Switch Bay 3's Switches 1 and 2. Refer to Table 8.

BIOS Base Addresses (BT-542S and BT-542D only).  Instead of using Switch Bay 
2's Switches 4 and 5 to define the BIOS base address the BT-542S and BT-542D 
use Switch Bay 3's Switches 3-5.  Refer to Table 9. Table 9.  BT-542S and 
BT-542D BIOS Base Addresses 
                             
    Switch Bay 3   Switch Bay 2     Switch Bay 1
     __________    __________        __________
 off| ........ |  | ........ | off  | ........ |  
 on | ........ |  | ........ | on   | ........ |  
    | 12345678 |  | 12345678 |      | 12345678 |  
    |__________|  |__________|      |__________|
     ________ ____________________
    | Switch |     BIOS           |
    | Bay 2  |     ADDRESS        |
    | 3 4 5  |                    |     ______
    |________|____________________|    | 0=on |
    | 0 0 0  | Disable            |    | 1=off|
    | 1 0 0  | Reserved           |    |______|
    | 0 1 0  | 0C8000h            |
    | 1 1 0  | 0CC000h, default   |
    | 0 0 1  | 0D0000h            |
    | 1 0 1  | 0D4000h            |
    | 0 1 1  | 0D8000h            |
    | 1 1 1  | 0DC000h            |
    |________|____________________|
    
     Table 9. BT-542S and BT-542D Bios Base Address
   
Table 10 Summary of BT-542 Switch and Jumper Settings

Table 10 and Table 11 summarize the BT-542 switch and jumper settings, 
respectively.  In Table 10,  "0" represents off and "1" represents on.  In 
Table 11, "0" represents open  and "1" represents closed.

               Table 10.  Summary  of  the  BT-542's Switch Settings

                Switch    Switch #     BT-542B          BT-542S/BT-542D
                Bay
 
SCSI ID              1  1,2,3=000      0                0
                              100      1                1
                              010      2                2
                              110      3                3
                              001      4                4
                              101      5                5
                              011      6                6
                              111      7, Default       7, Default

SCSI Parity          1        4=0      Disable          Disable
                              4=1      Enable, Default  Enable, Default

Disk > 1 GB          1        5=0      Enable  Enable
and not SCO                   5=1      Disable, Default Disable, Default
UNIX

SCSI Synchroniza-    1        6=0     Enable  Enable
tion Negotiation              6=1     Disable, Default  Disable, Default

DMA Channel          1    7,8=00      Disable           Disable
                              10      7                 7
                              01      6                 6
                              11      5, Default        5, Default

I/O Port Base        2  1,2,3=000     Reserved          Reserved
Address                       100     134H-137H         134H-137H
                              010     234H-237H         234H-237H
                              110     334H-337H         334H-337H
                              001     Reserved          Reserved
                              101     130H-133H         130H-133H
                              011     230H-233H         230H-233H
                              111     330H-333H,Def't.  330H-333H, Default                                      

BIOS Base            2    4,5=00      0C8000H           Defined by Switch
Address                       10      Disable           Bay 3.
                              01      0D8000H                 
                              11      0DC000H, Default


        Table 10.  Summary  of  the  BT-542's Switch Settings (Continued)     

                Switch    Switch  #    BT-542B          BT-542S/BT542D
                Bay                 
AT Interrupt         2   6,7,8=000     Reserved         Reserved        
Channel                        100     Reserved         Reserved
                               010     15               15
                               110     14               14
                               001     12               12
                               101     9                9
                               011     10               10
                               111     11, Default      11, Default

Host Bus Transfer    3     1,2=00      Defined by W11   8.0 MBytes/sec
Rate                           10      & W13.           6.7 MBytes/sec
                               01                       5.7 MBytes/sec
                               11                       5.0 MBytes/sec,                                                                      
BIOS Base            3   3,4,5=000     Defined by       Disable
Address                        100     Switch Bay 2.    Reserved
                               010                      0C8000H
                               010                      0CC000H
                               001                      0D0000H
                               101                      0D4000H
                               011                      0D8000H
                               111                      0DC000H, Default
    
                              6,7,8  Not available   Reserved


                  Table 11. Summary of the BT-542's Jumper Settings
                                                        
                             Jumper #     BT-542B       BT-542S/BT-542D

Host Interrupt Channel             W3     15            15
                                   W4     14            14
                                   W5     12            12      
                                   W6     11, Default   11, Default
                                   W7     10            10
                                   W8     9             9
Host Bus Transfer Rate     W11,W13=00     5.0 MB/sec    Defined by      
                                   01     5.7 MB/sec    Switch Bay 3.   
                                   10     6.7 MB/sec                         
                                   11     8.0 MB/sec       
Host I/O Channel Ready        W17  A-B    Enable, Def't. Enable, Default
                                   B-C    Disable        Disable
Floppy I/O Adddress                W14=0  Prim.(3FX),Def't.Prim. (3FX), Def't.
                                   W14=1  Sec. (37X)     Sec. (37X)
Floppy Controller             W15,W16=00  Disable        Disable

Installing the BT-542 

This section describes how to install the BT-542 in a 16-bit slot inside 
the PC/AT host system and how to connect it to other devices. Install the 
BT-542 in your PC/AT host system by performing the following steps.

1. Remove power from the PC/AT host system. 

2. Referring to the PC/AT host system owner's manual, open the case to 
gain access to the motherboard and expansion slots. If the comput-er has been 
on, wait a few minutes until the power supply case has cooled down inside the 
computer. If the power supply case is cold, touch it to discharge any static 
electricity that may be on your clothes or body. If a disk controller drive 
board has been installed, remove all connecting cables to the board and then 
lift it out of the PC/AT host system. 

3. Remove the mounting screw and the existing bracket from the rear 
panel behind the 16-bit slot that has been selected for insertion of the 
BT-542. The slot closest to the disk drives is the best choice.

4. If the BT-542B will be installed in a PC/AT host system which is not 
at either end of the SCSI bus, terminators RP5, RP6, and RP7 on the board 
will need to be removed. RP5, RP6, and RP7 are 220 ohm/330 ohm resistor packs.

For the BT-542D, terminators are RP11 through RP18.  RP11, RP12, RP15, and 
RP18 are 150 ohm resistor packs. RP13, RP14, RP16, and RP17 are 330 ohm 
resistor packs.  For the BT-542S, terminators are RP8 and RP9.  RP8 and RP9 
are 110 ohm resistor packs. See the following heading, "Host Adapter 
Integration," for more information regarding device termination. The BT-542 
is shipped with terminators installed.

5. Press the BT-542 downward into the 16-bit selected slot, align the 
mounting bracket, and reinstall the mounting screw.

CAUTION
Make sure that the board is properly seated in the slot.

6. Connect the large 50-pin connector within the PC/AT host system to 
the single-ended SCSI connector, J3.  Place the connector cable around the 
power supply and over any other boards. Depending on the configuration of 
your computer, other types of cables could be used. See the heading, "Cabling 
Requirements," in this manual for details.

7. If the floppy controller on the BT-542 will be used, connect the 
smaller 34-pin connector from the floppy disk drive to the J2 connector 
marked "Floppy." Make sure the ribbon cable is installed correctly. The dark 
stripe on the cable indicates where Pin #1 is connected.

8. Insert the four-pin header connector from the drive activity LED on 
the front panel of the PC/AT to connector J1 on the  BT-542. This connector 
is reversible and may be plugged into J1 in either direction.

9. Verify that all connections are secure.

10. Reattach and close the cover of the PC/AT host system as described in 
the system owner's manual.


Host Adapter Integration

Device Termination

SCSI devices are daisy chained together with a common cable. All SCSI devices 
operate on common signals and both ends of the cable are terminated with 
hardware terminators. Terminators, which can be connected to either SCSI 
devices or SCSI cables, are required to make data transfers on the SCSI bus 
reliable.

Devices connected to SCSI chains must have the correct number of terminators 
for proper operation and to prevent damage to the SCSI chip on the BT-542. 
There can be no more than two terminators in a chain of SCSI devices-one at 
each end of the physical chain. Thus if more than two SCSI devices are 
connected in a SCSI daisy chain, the middle device(s) in the control cable 
must have the terminator resistor packs on the device(s) removed. See Figure 
3 for possible configurations of ter-minators in a SCSI system.

Cabling Requirements

Selecting the proper SCSI cable for a particular system configuration is of 
great importance. If two or more SCSI devices are configured in a SCSI daisy 
chain, the devices must be connected by a 50-conductor, daisy-chain cable. 

Before plugging in cable connectors, check that the "t" mark molded on the 
connector or the colored stripe on the cable (indicating the location of Pin 

1) matches Pin 1 of the connector on the BT-542.

SCSI Device ID Selection

The SCSI ID is a number between 0 and 7 assigned to any SCSI device. The SCSI 
ID number is used by the computer to communicate with the devices connected 
to it. All SCSI devices must have a unique SCSI number to identify it on the 
SCSI chain.  When two or more SCSI devices communicate, a SCSI device is 
usually fixed as either an initiator or a target; however, some devices are 
capable of performing either role. Devices with higher ID numbers have a 
higher priority in communicating with the computer.

Most SCSI peripheral devices are shipped with a preassigned SCSI ID number. 
A SCSI ID switch is usually located on the back panel of such devices. Change 
the SCSI ID of other peripheral devices only as recommended in the owner's 
manual.  Refer to the heading, "BT-542 Switch and Jumper Settings," in this 
manual for information on how to set the SCSI ID number of the BT-542.

Hard Disk Initialization

This section describes the system set up, initialization, partitioning and 
formatting of hard disk drives used with the BT-542.  These procedures will 
erase all data on your disk drives. Before following these procedures make 
sure that all necessary data is backed up on another drive.

Set-up, Initialization, and Partitioning Procedure
To perform set up, initialization, and partitioning, proceed as follows.

1. After plugging in and connecting your BT-542 (see the previous 
parts of this section), apply power to the PC/AT host system.

2. Insert the system diagnostic diskette in the drive, or execute the 
host's internal diagnostic/set-up program. See your particular sys-tem's 
installation instructions. 

3. In accordance with the menu that appears on the system monitor, 
run SETUP and configure the host CMOS RAM options. Set the 
hard disk option for SCSI drive to "No Hard Drive Installed."
The following Steps 4 through 8 may not be necessary if your SCSI 
hard disk drive has already been formatted.

4. Reboot the PC/AT host system and insert the DOS diskette containing the 
DEBUG program.

5. After the DOS prompt, type the following for low-level format:

6. Perform the following steps on your screen monitor to configure and 
perform a low-level format on attached devices:
     A) The "SCSI Fixed Disk Format Utility" appears on the screen. Enter 
        "1" to view the attached devices, then press the return key.

     B) A list of all attached drives appears under the option prompt. Press 
        the "2" key until the drive to be formatted is the current drive.
     C) Press "3" and then press the return key to format the drive. 
        The following prompt appears.
          All data on this drive will be lost!
          Proceed with low level formatting? (Y/N) __
          Enter "Y" to proceed with low-level formatting and follow the 
          instructions as they appear on the screen.
     D) The system will format the SCSI drive selected. When the format is 
        completed, press any key to return to the main menu shown in the 
        preceding Step 6A. Enter "4" to verify the drive and then 
          press the return key. The following prompt appears.
          All data on this drive will be verified.
          and bad data areas will be reassigned.
          Proceed with low level verification? (Y/N) __
          Enter "Y" to proceed with verification.
     E) When the verification is finished, press any key to return to the 
        main menu shown in the preceding Step 6A. Enter "5" to exit to DOS, 
        and then press the return key.
The following Steps 7 and 8 are unnecessary if the operating system to be 
installed is not DOS. 

7. Run the DOS FDISK program to partition the disk for the number of 
cylinders to be used by DOS. The following steps are recommended for users 
who are not familiar with the DOS FDISK program. See your DOS manual for 
information on the FDISK command.
     A) Enter "fdisk" and then press the return key. The following 
        menu appears.

     B) Enter "1"and then press the return key to create a DOS 
        partition. The following menu appears.

     C) Enter "1" and then press the return key to create a primary 
        DOS partition. The next menu appears.

     D) Enter "Y" and then press the return key to create a primary 
        DOS drive partition with the maximum size. The following prompt 
        appears.

When the partitioning has been completed  (indicated by another prompt), 
press any key to return to DOS. 

8. Install DOS by running the FORMAT program as instructed by DOS normal 
installation procedures. The next steps are recommended for operators who 
are not familiar with the DOS FORMAT program.
     A) The following menu appears.

     B) When the format has been completed, the following prompt  appears.

     C) Enter any legal file name to label the volume just created. Refer to 
        your system operator's manual for more details on DOS for-mat 
        procedures.
This concludes the BT-542 hardware and software installation procedures.

Warranty Information
If damage to the board has occurred, return it in the protective envelope 
with this manual to your BusTek board supplier. The shipping agent should 
also be notified if the unit has been damaged during shipment. The BusTek 
warranty conditions are given in the back of this manual.



APPENDIX A--BT-542 INTERNAL DIAGNOSTICS

When power is first applied to the BT-542, an on-board diagnostic routine is 
run to verify that the major  functional  components of the board are 
operating correctly.   The 80C20 bus master chip, the SCSI controller chip, 
the firmware PROM, the local RAM and internal data buses are tested.  Results 
of the tests are indicated by an LED on the board.

The LED will first turn on when power is applied.  If the diagnos-tics find 
no malfunctions, the LED will then go off.  In normal oper-ation, the LED 
will be illuminated when command or SCSI bus activity occurs on the board.

If an error is detected by the diagnostics, the LED will repeatedly  
flash a specific number of times, with a long pause between flashes, to 
indicate the board function which failed. This will continue un-til the board 
is powered down or reset.  Failure interpretation from the number of flashes 
is as follows:
        
Number of LED Flashes       Interpretation of Failure
         Always On      BT-542 is not operating or                              terminators are missing.
                   1    Firmware ROM checksum failure.                  
                   2    Local RAM test failure.
                   3    SCSI controller chip or SCSI                            interface failure.
                   4    Internal data bus failure.
                   5    Internal address bus failure.
                   6    80C20 bus master chip failure
                   7    SCSI drive type mismatch*
    Constantly Flashing Fuse Blown.

*This error message is only applicable to the BT-542D when
  single-ended SCSI drives are connected to the differential
  SCSI bus.


PRODUCT SUPPORT RECORD

The information on this page should be compiled and provided to your supplier 
in writing to obtain technical support assistance.  This will enable your 
supplier to respond more rapidly and more appropriately to your problem.

About BusTek Product:
        BusTek Product No: ______________________  
        Serial Number  ___________________________
        Date of Purchase  _________________________
        Firmware Version Number:________________
        BIOS Version Number:  __________________

Purchased From:
        Company:        ___________________________________________
        Address:        ___________________________________________
                        ___________________________________________
Purchased By:
        Name/Title:     ___________________________________________
        Company:        ___________________________________________
        Address:        ___________________________________________
                        ___________________________________________
        Telephone #:    ___________________________________________

About System Hardware Configuration:
        System Manufacturer:      _________________________
        System Model and Speed:   _________________________
                                  _________________________
        System BIOS Manufacturer: _________________________
        Memory in System:         _________________________
        Hard Drives on System:    _________________________

About System Software Configuration:
        Operating System/Version:       _________________________
        Application Program/Version:    _________________________       
Detailed Description of Problem:
 
 
STANDARD WARRANTY

BusTek warrants that subject to the terms of this policy the Products shall 
be free from defects due to faulty material or workmanship on the part of 
BusTek for a period of one year from the date of delivery.

This warranty shall not apply if the Products have been subject to misuse by 
Customer or any other party; if any material alteration, addition, amendment, 
or modification shall have been carried out without the prior written 
consent of BusTek; failure to install or operate the Products in accordance 
to BusTek's Product reference manual; or failure caused by improper or 
inadequate maintenance of users.

BusTek will make good by repair or at its option by replacement any Products 
which become defective within the warranty period.  Repairs will be warranted 
for 90 days.  Products or parts replaced under this provision shall become 
the property of BusTek.

BEFORE RETURNING A PRODUCT FOR REPAIR, BUYER MUST REQUEST A RETURN MATERIAL 
AUTHORIZATION (RMA) NUMBER FROM BUSTEK.

All Products under warranty returned to BusTek for repair shall be returned 
to Customer at BusTek's expense.  Shipping costs for all Products returned 
to BusTek for repair which are out of the warranty period shall be at 
Customer's expense both to and from BusTek.

Customer is expressly prohibited from issuing Debit Memos for material 
returned under the provisions of this warranty.

BusTek shall notify Customer in the event that the Products returned for 
repair are not, in BusTek's sole opinion, within this Warranty condition and, 
unless disposition instructions are given for such Products within thirty 
(30) days of such notification, the Products will be returned to Customer 
freight collect.

EXCEPT FOR THE ABOVE EXPRESS LIMITED WARRANTY, BUSTEK MAKES NO WARRANTIES, 
EXPRESS, IMPLIED OR STATUTORY, AND BUSTEK SPECIFICALLY DISCLAIMS ANY IMPLIED 
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

The total liability of BusTek for any claim or damage arising out of this 
Agreement, and whether in contract or in tort, shall not exceed the price of 
the individual Product(s) whose defect or damage is the basis of the claim.

IN NO EVENT SHALL BUSTEK BE LIABLE FOR ANY LOSS OF PROFITS OF FOR ANY OTHER 
INCIDENTAL OR CONSEQUENTIAL DAMAGES.

No action against BusTek for breach of the warranty shall  be commenced more 
than one (1) year after the accrual of the cause of action.

Customer also agrees to perform its duties and responsibilities under BusTek's 
Warranty Policy, which shall be updated from time to time.


