





                                      
                     INSTALLING THE ST01 HOST ADAPTOR
                     WITH A SEAGATE SCSI DISC DRIVE
  
                         I. Introduction

 Seagate reserves the right to change, without notice, the specifications
 contained in this file.
  
 The ST01 provides the connection between the IBM PC XT/AT* (or compatible)
 and up to two Seagate SCSI drives.

 *IBM PC XT/AT are registered trademarks of International Business Machine
 Corporation.
  
 -The ST01's onboard software will assist you with the required formatting
 operation.
      
 -Drive's with more than 32 formatted megabytes require device driver
 software for formatting.  Seagate  currently  ships  partitioning software
 only with drives greater than 32 formatted megabytes.
  
 Before attempting  installation read through these instructions and verify
 that the system is powered-down.

  
                  II.ST01 AND Disc Drive Installation
  
 1. Remove the top cover from the system. Retain the screws.
  
 2. Set the SCSI ID jumper on the disc drive. The ST01 recognizes devices
 by their SCSI ID number.
  
 -If you are installing one drive, the ID number is O (no jumper). The
 drive is shipped with ID set to zero.
  
 -A second physical drive must be set as ID number 1. ID number 1 is
 selected by placing a shorting jumper on the set of shorting pins
 furthest away from the 50 pin  cable connector  on the  drive. If  you are
 installing  two  drives,  remove  the  resistor termination packs from the
 first drive.
  
 -Note: If the drive has a parity jumper, it must remain shorted. The
 parity jumper is the set of pins closest to the 50-pin cable connection on
 the drive.
  
 3. Remove the ST01 from the protective covering and pull the rubber
 strips from between the connector pins. Observe static-discharge
 precautions and do not touch the board components or edge-connectors.
  
 4. Set the starting address on the ST01.
  
 -CA000 is the default BIOS address. If there is a board already installed
 at this address in the system, use the jumpers to change to another





 address. See table 1.
  
                Table 1:  ST01 Host Adaptor                                
      
 There are four possible starting addresses for the ST01 BIOS
                                                                        
                                               
           Configuration                Address           
              
 No jumpers installed                    CA000 (default)      
 Pins A-B shorted (top 2 pins)           C8000 
 Pins C-D shorted (bottom 2 pins)        CE000          
 Pins A-B & C-D shorted:                 DE000
  
  

 -A two-pin jumper is provided near the bottom of the Host Adaptor to
 disable the zero-wait-state (0WS)logic for some PC XT/AT look-alikes that
 do not use the 0WS control line. If the default configuration does not
 work properly, remove the jumper to disable this line. 
  
 5. Connect the cable to the ST01. You may find it easier to attach the
 cable before you install the ST01 in the system.
  
 -Pin-1 on the ST01 corresponds to pin-1 at the drive connector. Note that
 some cables have a contrasting-color stripe to indicate pin-1.
  
 6. Install the ST01 into an available bus  slot.   For PC  XT applications
 only: DO NOT USE slot number eight, which is next to the power supply.
  
  7. Install  the drive in the left-drive bay, if possible, to be sure that
 the power supply does not obstruct the cable.
  
 -For ease of installation attach the cable to the drive before you slide
 it completely back and into position.
  
 -Minimum required for mounting: 4, 6-32 UNC-2B x 0.31 inch screws. Snug
 the  screws  down  evenly  to   approximately   8-inch   pounds.   DO  NOT
 OVER-TIGHTEN.
  
 8. Connect the drive DC power line.
  
 9. Verify that all connections are correct and replace the system cover.
 Go to section III for the required formatting operation.
  
               III. Formatting a Drive with the ST01

 At  power-on  the  ST01's  onboard  program  will  assist  you by means of
 help-screens.  Follow the short steps.  You will  need the  DOS* diskettes
 and manual which came with your system.  VERIFY CORRECT INSTALLATION, TURN
 ON THE SYSTEM AND FOLLOW THE SCREEN INSTRUCTIONS.

 *DOS is a registered trademark of Microsoft Corporation. 






 1. You will be instructed to run the DEBUG program followed by the
 starting address.
  
 2. When the low-level format is complete, you will be instructed to run
 the FDISK and FORMAT programs. Some versions of DOS have different names
 for these two programs. See your DOS manual.
  
 -The FDISK program will instruct you to strike any key to restart the
 system. Disregard this instruction. INSTEAD, PRESS THE CTRL-ALT-DEL KEYS
 SIMULTANEOUSLY TO RESTART THE SYSTEM. Striking keys other than Ctrl-Alt-
 Del may prevent booting form the hard disc. If you accidentally press
 other keys, rerun the formatting program, using the DEBUG program.
  
 3. If you have a problem getting the system to boot:

 - Check cabling: Pin-1 on the ST01 corresponds to pin-1 at the drive.
  
 - Verify correct SCSI ID number set at the drive.(See section II)
  
 - Verify correct address and 0WS jumper setting on the ST01.(See Table 1)
  
           IV. Read/Write Head Parking Utility
  
 If you are transporting the system or shipping the disc drive, and wish
 to park the read/write heads, run the DEBUG.com program and type g=CA000
 followed by Return.
  
 This routine applies only to the ST225N. All other Seagate intelligent
 drives will automatically park the heads at power-down.
  
 Note: IF YOU HAVE CHANGED THE ST01 BIOS ADDRESS JUMPER (TABLE 1), YOU
 MUST ENTER THIS ADDRESS IN PLACE OF CA000.
  



