
X T - 8 3 8 0 S    MAXTOR
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    1632|     |     |
Capacity form/unform   360/  410 MB        Heads           8|     |     |
Seek time   / track  15.0/ 3.0 ms          Sector/track   54|     |     |
Controller           SCSI1 SINGLE-ENDED    Precompensation
Cache/Buffer            45 KB FIFO BUFFER  Landing Zone
Data transfer rate          MB/S int       Bytes/Sector      512
                      4.800 MB/S ext SYNC
Recording method     RLL                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      8 80
       standby            W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle               W     Shock        g         2       |     20
       seek          27.0 W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   48
                                MTBF         h      40000
                                Warranty Month        24
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC380,IEC950,UL47...

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MAXTOR   XT-8000S FAMILY  QUICK REFERENCE GUIDE 1018333 REV. A

  +----------------+---------+------------------------+++---+
  |                +---J4----+                     JP34+JP41|XX
  |                                                RN18+    |XX
  |                                                   ||    |XX
  |                                  +JP37 ++         1+    |XX
  |                                  ++    +JP38   RN19+    |XX
  |                                  +JP36            ||    |XX
  |                                  ++               1+    |XX
  |                                  +JP35 +JP40   RN17+    |XX
  |                                  ++    ++         |+JP18|X1
  |                                                   1++   +-+
  |                                                        +-+|
  +-+                                                     J6-1|
  | |                                                      +-+|
  | J5                                                    J2-1|
  +-+              +JP14                                    +-+
  |                ++                                      XX J3
  |                                                        XX Power
  +---------------------------------------------------------+



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MAXTOR   XT-8000S FAMILY  QUICK REFERENCE GUIDE 1018333 REV. A

 Jumper setting
 ==============

 x = Jumper set at factory


  J2  Auxiliary Connector Pin Assignment
  --------------------------------------
         +------+------+------+------+------+
         |Pin 9 |Pin 7 |Pin 5 |Pin 3 |Pin 1 |
         |GND   |-WRT  |-LED  |(key) |+LED  |
         |      |PROTEC|      |      |      |
         +------+------+------+------+------+
         |Pin 10|Pin 8 |Pin 6 |Pin 4 |Pin 2 |
         |ID0   |ID1   |ID2   |GND   |(open)|
         |      |      |      |      |      |
         +------+------+------+------+------+

 When pin seven is connected to ground, the drive is protected from
 writing, regardless of commands sent to the drive via the SCSI inter-
 face. The write protect signal may also be connected to an LED whose
 (+) terminal is tied to a voltage source, so that the LED is
 illuminated when the pin is grounded and the drive is in write
 protect mode.

 For remote write protect, JP18 must be removed.

 When an LED is connected to pins one (+) and five (-), that LED
 functions in the same manner as the LED which is mounted on the
 drive's faceplate. This is typically used in cases when the drive
 is positioned where the LED is not visible or the faceplate has been
 removed.

 Pin three is not present so that users can key the mating connector.
 Pin three of the mating connector should be blocked for this purpose.

 The SCSI ID of the drive may be programmed remotely by selectively
 connecting pins six (ID2), eight (ID1), and ten (ID0) to ground, or
 leaving them open.

 SCSI ID jumpers (JP35 through JP37) must be removed for the remote
 SCSI ID option.


 JP37/36/35  SCSI ID
 -------------------
 +--------+----------+---------+---------+---------+
 |SCSI ID | Priority |JP37 ID2 |JP36 ID1 |JP35 ID0 |
 +--------+----------+---------+---------+---------+
 |   0    | Lowest   |OPEN     |OPEN     |OPEN     |
 +--------+----------+---------+---------+---------+
 |   1    |   .      |OPEN     |OPEN     |CLOSED   |
 +--------+----------+---------+---------+---------+
 |   2    |   .      |OPEN     |CLOSED   |OPEN     |
 +--------+----------+---------+---------+---------+
 |   3    |   .      |OPEN     |CLOSED   |CLOSED   |
 +--------+----------+---------+---------+---------+
 |   4    |   .      |CLOSED   |OPEN     |OPEN     |
 +--------+----------+---------+---------+---------+
 |   5    |   .      |CLOSED   |OPEN     |CLOSED   |
 +--------+----------+---------+---------+---------+
 |x  6    |   .      |CLOSED   |CLOSED   |OPEN     |
 +--------+----------+---------+---------+---------+
 |   7    | Highest  |CLOSED   |CLOSED   |CLOSED   |
 +--------+----------+---------+---------+---------+

 The disk is shipped from the factory with an ID of six. This assures
 that sufficient jumpers are available for any address except seven,
 which is usually reserved for the host system.

 The SCSI device ID can also be set remotely through the auxiliary
 connector. The SCSI ID jumpers must be removed for this option. Any
 shorting required for a selected ID is done outside the drive.


 JP14/JP38  Drive Power-Up Options
 ---------------------------------
 In order to allow for system power supply constraints, which may
 require minimizing surge current when powering up multiple drives,
 three modes of start up sequencing are provided.

   +------+--------------+-----------------------------+
   |JP14  |JP38          |Mode                         |
   +------+--------------+-----------------------------+
   |OPEN  |OPEN          |Start by ID Sequence         |
   +------+--------------+-----------------------------+
   |OPEN  |CLOSED        |Wait for START Command       |
   +------+--------------+-----------------------------+
  x|CLOSED|OPEN or CLOSED|Start when power is Applied  |
   +------+--------------+-----------------------------+

 Start by ID Sequence
 With both JP14 and JP38 out, the drive delays spinup for approxi-
 mately 11 to 13 seconds times the SCSI ID. This allows for power up
 sequencing. A RESET condition results in the drive delaying its
 spinup according to its SCSI ID.

 Wait for Start Command
 With JP14 out and JP38 in, the drive does not spin up until the
 initiator issues a START/STOP UNIT Command with the start bit equal
 one.

 Start when power is Applied
 When JP14 is in and JP38 is out, the motor starts as soon as power is
 applied. The drive is shipped in this configuration.


 JP41/34  Terminator Power Selection
 -----------------------------------
 Power to the terminators may come internally from the drive, or
 externally from the SCSI bus.

   JP34  OPEN
 x JP41  CLOSED  Terminator power is internal, from the drive

   JP41  OPEN
   JP34  CLOSED  Terminator power is external, from the SCSI bus


 With both JP41 and JP34 in, terminator power is provided from the
 drive and to the SCSI bus. Hence, the drive is at one end of the SCSI
 bus with terminators in place and is also supplying terminator power
 for the device at the other end of the SCSI bus.


 JP18  Write Protect Option
 --------------------------
   JP18  CLOSED  Data cannot be written to the drive; only READ opera-
                 tion can be executed.

 Installation of JP18 grounds the remote write protect line, J2, pin
 seven, forcing WRITE PROTECT on, and prevents remote control through
 J2-7 on the ten-pin connector.

 As shipped from the factory, JP18 is out, allowing normal reading/
 writing, or optional remote control through the J2 connector.


 JP40  Parity Option
 -------------------
  x JP40  CLOSED  Enables odd parity detection in the drive.
          OPEN    Disables odd parity detection in the drive.

 Odd parity is always generated by the drive and provided to the SCSI
 bus.


 Other Jumpers
 -------------
 Other jumper positions not shown are not user selectable. These
 jumpers are for factory use only. Improper operation may occur if
 non-user jumpers are changed.



 J3   DC Power and pin connector assignments
 -------------------------------------------
      +------------+   pin 1    +12 VDC
      | 4  3  2  1 |   pin 2    +12 Volts Return
      +------------+   pin 3    + 5 Volts Return
                       pin 4    + 5 VDC



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MAXTOR   XT-8000S FAMILY  QUICK REFERENCE GUIDE 1018333 REV. A

 Notes on Installation
 =====================

 Installation direction
 ----------------------

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
 +---------------------+           |  +-----+           +-----+  |
 +-+-----------------+-+           +--+                       +--+
   |                 |
   |                 |
   +-----------------+

 The drive will operate in all axis (6 directions).


 Mounting
 --------
 The drive may be mounted in any orientation. In any final mounting
 configuration, ensure that the operation of the three shock mounts
 which, isolate the base casting from the frame is not restricted.
 Certain switching power suppplies may emanate electrical noise, which
 can degrade the specified read error rate. For best results, orient
 the drive so that the PCB assembly is not adjacent to these noise
 sources.


 Mounting Holes
 --------------
 Eight mounting holes, four on the bottom and two on each side, are
 provided for mounting the drive into an enclosure. The size and
 location of these holes are identical to industry standard floppy
 drives.

 Caution: The casting is very close to the frame mounting holes in
 some locations. Mounting screws lengths must be chosen such that no
 more than 0.125 inch of the screw is available to enter the frame
 mounting hole. The torque applied to the mounting screws must be
 between 9 and 12 inch pounds.


 J1/P1 SCSI Connector
 --------------------
 Connection to J1 is via a non-shielded fifty-conductor connector P1,
 consisting of two rows of twenty-five female contacts on 0.1 inch
 centers. Recommended strain-relief connectors are AMP part-number
 1-499506-2, or Dupont part number 669002 (66900-250). Use of a keyed
 connector is strongly recommended.


 J2/P2 Auxiliary Connector
 -------------------------
 Connector J2 is an auxiliary connector providing remote control of
 write protect and SCSI ID, and the ability to carry the LED signal
 beyond the drive. The auxiliary connector is a Berg 68451-121,
 ten-pin part. The mating connector is a 3M 3473-6010 part.


 J3/P3 Power Connector
 ---------------------
 The DC power connector, J3, is a four-pin AMP MATE-N-LOCK connector,
 part number 350543-1. The recommended mating connector is part
 number 1-480424-0. using AMP pins part number 350078-4 (strip) or
 part number 61173-4 (loose piece).


 J4/P4 Ground
 ------------
 The DC ground connector is a Faston-type connector, AMP part number
 61761-2. The recommended mating connector is AMP part number 62187-1.
 If wire is used, the hole in J4 will accommodate a maximum wire size
 of 18 AWG. This wire should be grounded to the AC ground or to the
 metal of the computer frame.


 Sector Size
 -----------
 The drive is shipped from the factory formatted with 512 byte
 sectors. Configuration parameters are default values in all optional
 cases. It is recommended that users reformat the drive with the
 user's sector size, using the Plist and the user's configuration
 parameters.


 Interface Termination
 ---------------------
 SCSI devices require proper interface termination. The first device
 and the last device on the daisy chain SCSI bus must be terminated.
 Remove the terminators from any devices in between. For instance, if
 the drive is in the middle of the string, remove its terminators.

 Pin one is on the end of the terminator that is marked with a dot.
 Note that the hole/solder pad for pin one has a square outline,
 whereas all others have a round outline. Pin one is oriented toward
 the power connector, J3.

 Note: All terminator packs (RN17 through RN19) must be oriented
 with the dot toward J3 for the drive to work properly.

 As shipped, interface signal lines are terminated with three
 removable 220/330 ohm resistor network packs.

 The device driving the drive inputs should be open collector devices
 capable of sinking at least 48 milliamps at a voltage level of less
 than 0.5 volts DC (7438 or equivalent).

 Devices receiving the drive inputs should be SCHMITT trigger type
 to improve noise immunity; 74LS14, 74LS240, or equivalent. The
 initiator should not load bus with more than one standard low power
 Schottky transistor-transistor logic (LSTTL) input load per line. The
 initiator should terminate all signals with 220/330 ohm terminators.


 Removable Faceplate
 -------------------
 The faceplate may be removed in installations where it is not
 required. Remove the two C-clips and unplug the LED cable from the
 PCB.



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MAXTOR   XT-8000S FAMILY  QUICK REFERENCE GUIDE 1018333 REV. A


 Seek Time
 ---------
                                        | 8380S  | 8760S  |
      ----------------------------------+--------+--------+
      Track-to-Track         msec. typ. |   2.5  |   2.5  |
                             msec. max. |   3    |   3    |
                     Average msec. typ. |  14.5  |   16.5 |
                     Average msec. max. |  16    |   18   |
      Full Stroke            msec. typ. |  29    |   30   |
                             msec. max. |  35    |   35   |
      ----------------------------------+--------+--------+

 Seek Time includes Settling Time.


 Reliability Specifications
 --------------------------
 MTBF                   40,000 POH, Typical Usage
 PM                     Not Required
 MTTR                   30 Minutes
 Component Design Life  5 Years


 WARRANTY
 --------
 Maxtor warrants the XT-8000S Family disk drives against defects in
 materials and workmanship for a period of twelve months, for the
 original purchaser. Direct any questions regarding the warranty to
 your Maxtor Sales Representative. Maxtor maintains Customer Service
 Centers for the repair and reconditioning of all Maxtor products.
 Direct all requests for repair to the Maxtor Service Center in San
 Jose. This assures you of the fastest possible service.


 REGULATORY APPROVALS
 --------------------
 UL Recognition obtained: File Number E87276 (S)
 CSA Certification obtained: File Number LR54048-6
 VDE Recognition obtained: File Number 37230G


 Technical Data Restrictions
 ---------------------------
 In case of sale to or use of units by DoD, use, duplication or
 disclosure of any software, firmware or related documentation is
 subject to restrictions stated in paragraph (c) (1) (ii) of the
 Rights in Technical Data and Computer Software clause at DFAR
 252.227-7013. For Civilian Agencies: Use, reproduction, or disclosure
 of the software and related documentation is subject to restrictions
 set forth in FAR 52.227-19. Unpublished rights reserved under the
 copyright laws of the United States. Maxtor Corporation, 211 River
 Oaks Parkway, San Jose, CA 95134.


 Product Description
 -------------------
 The XT-8000S Family disk drives are low cost, high capacity, high
 performance, random access storage devices which use nonremovable
 5.25 inch disks as storage media. Each disk surface employs one
 moveable head to access the data tracks. The total unformatted
 capacity of these disk drives ranges from 410 to 769 megabytes.

 The disk drive includes the Small Computer System Interface (SCSI)
 controller embedded in the disk drive electronics. Some of the
 resulting benefits of having an integrated controller include the
 elimination of a separate controller printed circuit board (PCB),
 reduction in the number of associated cables, and elimination of the
 controller-specific power supply.

 Low cost and high performance are achieved through the use of a
 rotary voice coil actuator and a closed loop servo system using a
 dedicated servo surface. The innovative MAXTOR rotary voice coil
 actuator provides performance usually achieved only with larger,
 higher powered linear actuators. The closed loop servo system
 and dedicated servo surface combine to allow state of the art
 recording densities (1,376 tracks per inch, and 31,596 bits per inch)
 in a 5.25 inch package.

 High capacity is achieved by a balanced combination of high areal
 recording density, run-length limited (RLL) data encoding, and high
 density packaging techniques. Maxtor's advanced MAXPAK electronic
 packaging technique uses miniature surface mounted devices to
 allow all electronic circuitry to fit on one PCB. Advanced flexures
 and heads allow closer spacing of the disks; therefore, a greater
 number of disks fit in a 5.25 inch package. Maxtor's unique
 integrated disk drive motor/spindle design allows a deeper head/disk
 assembly (HDA) casting than conventional designs, thus permitting
 eight disks to be used.

 The disk drive's electrical interface is compatible with the American
 National Standards Institute (ANSI) SCSI standard X3.131-1986, plus
 the Common Command Set (CCS) requirements. Size and mounting conform
 to the industry standard 5.25 inch form factor for floppy and
 Winchester disk drives, and the same direct current (DC) voltages and
 connectors are used.

 SUMMARY OF SUPPORTED SCSI COMMANDS
 For more information on Group 0 and Group 1 commands for
 direct-access devices, see the reference documents below:

 - ANSI X3.131-1986, Small Computer System Interface (SCSI), American
   National Standards Institute, Inc., June 23, 1986.

 - X3T9.2/85-52 Rev 4.B Common Command Set (CCS), a document of the
   American Standards Committee.


 GENERAL THEORY OF OPERATION
 ---------------------------
 The disk drive consists of read/write, control, and interface
 electronics, read/write heads, a servo head, a head positioning
 actuator, a disk drive motor/spindle, the disk media, and an air
 filtration system. The components perform the following functions:

 - interpret and generate control signals
 - position the heads over the desired track
 - read and write data
 - provide automatic error correction to the data
 - provide a contamination-free environment
 - provide a controller to interact with the initiator
 - maintain precise spindle rotation speed


 READ/WRITE CONTROL AND SCSI CONTROLLER ELECTRONICS
 --------------------------------------------------
 All the disk drive and controller electronics are packaged on a
 single PCB. This PCB, which includes three microprocessors, performs
 the following disk drive functions:

 - data separation
 - reading and writing of data
 - index detection
 - head positioning
 - head selection
 - disk drive selection
 - fault detection
 - track zero detection
 - recalibration to track zero on power up
 - track position counter
 - power and speed control for the spindle disk drive motor
 - braking for the spindle disk drive motor
 - disk drive up-to-speed indication
 - reduced write current on the inner tracks
 - monitoring for WRITE FAULT conditions
 - control of all internal timing
 - generation of SEEK COMPLETE signals
 - RLL encoding/decoding

 The PCB also performs the following controller functions:
 - error detection and correction
 - SCSI bus disconnect/reconnect functions
 - SCSI bus arbitration
 - defect handling
 - data transfer
 - automatic retries
 - data buffering
 - command linking
 - sector formatting


 DISK DRIVE MECHANISM
 --------------------
 The HDA is a sealed subassembly containing the mechanical portion of
 the disk drive. A brushless DC drive motor contained within the
 spindle hub rotates the spindle and is controlled by a dedicated
 microprocessor. The motor and spindle are dynamically balanced to
 insure a low vibration level, and dynamic braking is used to quickly
 stop the spindle motor when power is removed. The HDA is shock
 mounted to minimize transmission of vibration through the frame. The
 frame is the mechanical assembly holding the HDA and PCB.


 AIR FILTRATION SYSTEM
 ---------------------
 The disks and read/write heads are assembled in a Class 100
 environment and then sealed within the HDA. The HDA contains an
 absolute filter mounted inside the casting to provide constant
 internal air filtration. A second absolute filter, located on the HDA
 top cover, permits pressure equalization between the internal and
 ambient air.


 HEAD POSITIONING MECHANISM
 --------------------------
 The read/write heads are mounted on a head/arm assembly which is then
 mounted on a ball bearing supported shaft. The voice coil, an
 integral part of the head/arm assembly, lies inside the magnet
 housing when installed in the disk drive. Current from the power
 amplifier, which is controlled by the servo system, induces a
 magnetic field in the voice coil. This electrically induced field
 either aids or opposes the existing fields of the permanent
 magnets. The interaction of the permanent and induced magnetic fields
 causes the voice coil to move. Since the head/arm assemblies are
 mounted on the voice coil, the voice coil movement is translated
 through the shaft pivot point directly to the heads. The movement of
 the head/arm assembly in conjunction with the information from the
 servo system positions the heads over the correct cylinder.

 Movement of the voice coil actuator is controlled by the servo
 feedback signal from the servo head. The servo information is written
 onto the disk at the factory and provides the following control
 signals for the actuator:

 track-crossing signals during a seek operation, track-following
 signals during on cylinder operation, and timing information such as
 index and servo clock. Servo information also provides the timing
 necessary to divide a track into the sectors used for data storage.
 The servo control system has a dedicated microprocessor for fast,
 optimized performance.


 READ/WRITE HEADS AND DISKS
 --------------------------
 The disk drive employs state of the art sliders and flexures. The
 configuration of the sliders and flexures provides improved
 aerodynamic stability, superior head/disk compliance and an extremely
 high signal-to-noise ratio.

 The disk media is a thin, nickel-cobalt, metallic film deposited on
 130 millimeter diameter aluminum substrates. The coating formulation
 together with the low load force/low mass heads permits highly
 reliable contact start/stop operation. The nickel-cobalt metallic
 film yields high amplitude signals, and very high resolution
 performance compared to conventional oxide coated media.
 The metallic media also provides a highly abrasion and impact
 resistant surface, decreasing the potential for damage caused by
 shipping shock and vibration.

 Data on each of the data surfaces is read by one read/write head, and
 each head can access 1,632 physical tracks. There is one surface
 dedicated to servo information in each disk drive.


 TRACK AND SECTOR FORMAT
 -----------------------
 The standard track format is organized into sectors
 The sectors are addressed via the logical block address (LBA) in the
 SCSI commands. The method of encoding used is 2, 7 RLL.


 Initiator-Target Configurations
 -------------------------------
 The SCSI initiator interface offers a number of unique advantages
 which facilitate the interconnection of the disk drive with one (or
 more) computer systems. Unlike traditional microcomputer disk
 interfaces, such as ST506, SCSI supports multiple peripherals and
 different peripheral types all operating on the same bus structure.

 The disk drive also supports multiple host configurations consistent
 with the established arbitration cycle outlined in the SCSI
 standards. Configuration changes are made by changing the SCSI
 address jumpers. These jumpers should be set and verified when the
 disk drive is installed in the system.

 The SCSI implementation used on the disk drive is intended to
 facilitate high-speed data transfer between the initiator and the
 disk drive. Interconnection between the initiator(s) and the disk
 drive is via a fifty-conductor ribbon cable and uses the single-ended
 alternative (the single-ended alternative allows up to 6 meters of
 cable length).


 Logical/Electrical Signal Definitions
 The SCSI bus uses +5 volts (termination power), ground, and eighteen
 signal lines. Nine signals are for the 8-bit data bus with one data
 parity bit; the other nine signals are the SCSI control lines which
 coordinate access to the bus for transfers of commands, data, status,
 and messages. The interface signals are listed below; please refer to
 the published SCSI standard for further details.

 Across the SCSI bus all initiator signals are low-true for the single
 ended version. The signals are asserted, or active, at 0 to 0.5 volts
 DC, and deasserted, or inactive, at 2.5 to 5.25 volts DC. This
 low-true logic is indicated by the negative sign which precedes the
 signal name.

 -RST
 The -RST (reset) signal is an OR-tied signal asserted by the
 initiator, causing the drive to do a "hard" RESET, self configure and
 return to the IDLE condition. This signal is normally used during a
 power-up sequence. The - RST pulse should be at least 25 microseconds
 wide.

 -SEL
 The -SEL (select) signal, accompanied by the disk drive's SCSI ID bit
 (zero through seven), is asserted by the initiator and causes the
 disk drive to be selected. The - SEL line must be negated by the
 initiator after the disk drive asserts the -BSY line in response to a
 proper selection. The signal can be asserted by the arbiter
 (initiator or drive) in the ARBITRATION phase. The signal is also
 asserted by the disk drive during the RESELECTION phase.


 -BSY
 The -BSY (busy) signal is an OR-tied signal asserted by the drive,
 indicating that the bus is being used. It is also asserted by the
 arbiter during the ARBITRATION phase and by the initiator and the
 disk drive during the RESELECTION phase.

 -C/D
 Assertion of the -C/D (control/data) signal by the disk drive
 indicates that command, status, or message information is to be
 transferred on the data bus. Negation of this line indicates that
 data is to be transferred on the data bus.

 -I/O
 When the -I/O (input/output) signal is asserted by the disk drive it
 indicates that information is transferred to the initiator from the
 disk drive. Negation of the signal indicates that information is
 transferred to the disk drive from the initiator. Note that IN means
 toward the initiator.

 -REQ
 When asserted by the disk drive, the -REQ (request) signal indicates
 that a byte is to be transferred on the data bus. -REQ is negated
 following assertion of the -ACK line by the initiator.

 -ACK
 The -ACK (acknowledge) signal is asserted by the initiator, following
 the assertion of the -REQ line, to indicate that data has been
 accepted by the initiator, or that data is ready to be transferred
 from the initiator to the disk drive. -ACK is negated following
 negation of the -REQ line.

 -ATN
 The -ATN (attention) signal is asserted by the initiator to indicate
 the ATTENTION condition, which is a request by the initiator for the
 disk drive to enter the MESSAGE OUT phase.

 -MSG
 The -MSG (message) signal is asserted by the disk drive during one of
 the message phases. Messages may be either IN or OUT, depending on
 the state of the -I/O signal.

 -DB (7-0, P)
 The eight bidirectional data bus lines (DB 7-0) and the parity line
 (DBP) are used to transfer 8-bit parallel data to or from the
 initiator. Bit seven is the most significant bit. Bits zero through
 seven are also used as SCSI ID bits during the ARBITRATION, SELECTION
 and RESELECTION phases. Data bus parity (DBP) is odd.


 ELECTRICAL POWER INTERFACE
 --------------------------
 This subsection describes the power-up sequence for the disk drive,
 and the two connectors associated with the electrical power
 interface. These connectors are the power connector, J3, and the
 frame ground connector, J4.


 Power-Up Sequence
 -----------------
 DC power (+5 volts and +12 volts) may be supplied in any order. Both
 power supplies must be present, and within the tolerances of the
 power sensing circuit, before the motor will spin up. When the
 spindle reaches full speed, the actuator lock automatically
 disengages. The disk drive performs automatic seek calibration during
 start up for optimum seek performance. The disk drive spins up and
 becomes ready in 20 to 30 seconds. The disk drive executes its
 recalibration sequence whenever power is applied or the START STOP
 UNIT command is received. You may delay starting the spindle motor,
 to minimize power surges in multidrive configurations, by using the
 jumper options.


 SHIPPING
 --------
 At power down, the heads are automatically positioned over the
 nondata, dedicated landing zone on each disk surface. The automatic
 shipping lock solenoid is also engaged at this time. Maxtor ships the
 disk drive in single- and multipack shipping containers. Users can
 ship the disk drive installed when the nonoperating shock and
 vibration limits are not exceeded.


 DRIVE POWER-UP OPTIONS
 ----------------------
 In order to allow for system power supply constraints, which may
 require minimizing surge current when powering up multiple disk
 drives, three modes of start-up sequencing are provided.

 Start by ID Sequence: Both JP14 and JP38 are out. The disk drive
 delays spinup for approximately 11 to 13 seconds multiplied by the
 SCSI ID. This allows for power-up sequencing. A RESET condition
 results in the disk drive delaying its spinup according to its SCSI
 ID.

 Wait for START Command: JP14 is out and JP38 is in. The disk drive
 does not spinup until the initiator issues a START STOP UNIT command
 with the start bit equal to one.

 Start When Power Is Applied: JP14 is in and JP38 is out. The motor
 starts as soon as power is applied. The disk drive is shipped in this
 configuration.


 TERMINATOR POWER SELECTION
 --------------------------
 Single Ended Version: Power to the terminators may come internally
 from the disk drive, or externally from the SCSI bus. If JP41 is in,
 the terminator power is provided by the disk drive. If JP34 is in,
 the terminator power is external, from the SCSI bus.

 If both JP41 and JP34 are in, terminator power is provided from the
 disk drive and to the SCSI bus. Hence, the disk drive is at one end
 of the SCSI bus with terminators in place and is also supplying
 terminator power for the device at the other end of the SCSI bus.

 Differential Version: The differential version does not provide for
 termination on the PCB. Therefore, JP34 is shipped installed and JP41
 is not supported. This will provide +5v to the SCSI bus for external
 termination.


 INTERFACE TERMINATION
 ---------------------
 SCSI devices require proper interface termination. The first device
 and the last device on a SCSI bus daisy chain must be terminated.
 Remove the terminators from any devices in between. For instance, if
 a disk drive is in the middle of a SCSI bus daisy chain, remove its
 terminators.

 Terminator pin one is marked with a dot on the terminator.
 The orientation of the terminator on the PCB is also shown. Note that
 the PCB's hole/solder pad for pin one has a square outline,
 whereas all the other holes/pads have a round outline. Also, note
 that pin one is always the closest pin to the power connector, J3.

 NOTE: All terminator packs (RN17 through RN19) must be oriented with
 the dot towards J3 for the disk drive to work properly.

 As shipped, the interface signal lines are terminated with three
 removable 220/330 ohm resistor network packs.

 The devices driving the disk drive inputs should be open collector
 devices capable of sinking at least 48 milliamps at a voltage level
 of less than 0.5 volts DC (7438 or equivalent).

 Devices receiving the disk drive outputs should be of SCHMITT trigger
 type to improve noise immunity (74LS14, 74LS240, or equivalent). The
 initiator should not load the bus with more than one standard low
 power Schotky transistor-transistor logic (LSTTL) input load per
 line, and should terminate all signals with 220/330 ohm terminators.

 NOTE: The differential version does not provide for termination on
 the PCB. External terminators are available from Maxtor.


 POWER UP AND BUS RESET
 ----------------------
 The following sections describe the sequence of events during drive
 self-test and initialization sequences. The self-test sequence occurs
 before the initialization sequence.


 Self-Test Sequence
 ------------------
 The self-test sequence is executed upon drive power up. The self-test
 sequence verifies the integrity of the hardware. This test is not an
 exhaustive hardware diagnostic, but checks the major components for
 full function. The drive does not respond to SELECTION for the
 first 250 milliseconds of the self-test. After 250 milliseconds have
 elapsed, the drive responds to SELECTION with a BUSY status for 2 to
 3 seconds: this time is spent completing the remaining self-test
 sequences, initializing the SCSI circuitry, and enabling the SCSI
 interrupts. After the self-test is complete and the interface
 circuitry is initialized (approximately 3 seconds), the drive
 responds to SELECTION with CHECK CONDITION status and the appropriate
 sense data (i.e., UNIT ATTENTION, POWER ON/RESET condition).

 The self-test sequence consists of the following events:

 - Hardware Reset Test - This routine tests the microprocessor, buffer
   controller, disk formatter, and SCSI reset latch for the proper
   power up condition. If any of these tests fail, the drive can only
   be reset by a POWER UP condition.

 - Microprocessor Test - This routine tests the microprocessor's
   internal memory, timers, and register bank switching for proper
   operation.

 - Erasable Programmable Read Only Memory (EPROM) Checksum Test - This
   routine performs a checksum calculation on the controller firmware
   EPROM and compares it against the checksum stored in the EPROM.

 - Buffer Controller Test - This routine tests the buffer controller
   for proper operation. All the registers are tested and the chip is
   engaged to access random-access memory (RAM).

 - Dynamic RAM Test - This routine tests the dynamic RAM by writing
   and reading different patterns to memory. In addition, the buffer
   controller is tested for proper refresh operation and parity
   detection. This test also tests the memory parity interrupt.

 - Disk Formatter Test - This routine tests the disk formatter chip by
   writing and reading all possible patterns to each of the disk
   formatter chip registers. After the registers are tested, the
   interrupts are tested to ensure that the formatter chip generates
   an interrupt when a command completes.

 - SCSI Controller Test - This routine tests the SCSI controller chip
   by executing the chip diagnostic command. After the diagnostic test
   completes, the interrupts are tested to ensure that the SCSI chip
   generates an interrupt when a command completes. Finally, the
   registers are tested by writing and reading all possible patterns
   to each of the SCSI controller chip registers.

 If any portion of the self-test fails, except the hardware reset
 test, the drive can be reset by a SCSI bus RESET condition or a power
 up RESET condition. The failure of the hardware reset test is
 considered a catastrophic failure and the controller can only be
 reset from such a failure by a power up RESET condition.



**********************************************************************
                      G   E   N   E   R   A   L
**********************************************************************
MAXTOR    SCSI INSTALLATION

         GENERIC INSTALLATION PROCEDURE FOR A SCSI DRIVE
   -----------------------------------------------------------

 1. Install a 50 pin ribbon connector making sure pin 1, which
    can be identified by the striped edge of the cable, is closest
    to the power connector on the drive.

 2. Install a DC power cable to the back of the drive.

 3. Verify the SCSI ID selection.
    Note: SCSI ID usually needs to be set to 0 to be the boot drive.
    The last physical device on the SCSI bus must be terminated.
    Any other drive or SCSI device connected between the host and
    the device at the end of the bus must not be terminated.

 4. Apply power to the computer.

  4a. When memory test is complete go into your system's Standard
      C-MOS set-up.
      (Note:  There are various ways to get into C-MOS set-up,
      please refer to system's manual for instuctions.)

  4b. Set the drive type to "Not Installed". This intelligent drive
      will identify itself to the SCSI host adapter.

 5. Boot from a DOS diskette that has FDISK.EXE and FORMAT.COM on
    it. At the A> prompt type in FDISK. At the menu options select
    option 1 to create a DOS partition. Another menu will appear and
    from those options choose 1 to create a Primary DOS partition.
    Select yes to make 1 large partition and it will automatically
    become active. Then escape from FDISK.

 6. At the A> prompt type in FORMAT C:/S
    This does a high-level format on the drive and transfers the
    system files in order for the drive to be bootable.
    (Note: Maxtor SCSI drives are low-level formatted at the factory)

 7. The drive is now bootable. As a test remove the DOS diskette
    from A and press reset to re-boot the computer, a C> should be
    displayed, the drive is now ready for operation.


