
H P   9 7 5 4 8   S    HEWLETT PACKARD
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    1447|     |     |
Capacity form/unform   663/  793 MB        Heads          16|     |     |
Seek time   / track  16.5/ 3.5 ms          Sector/track   56|     |     |
Controller           SCSI1 SINGLE-ENDED    Precompensation
Cache/Buffer            64 KB DUAL-PORTED  Landing Zone
Data transfer rate    1.600 MB/S int       Bytes/Sector      512
                      4.000 MB/S ext SYNC
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C           50    |    -40 65
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305 15.240
       idle          23.0 W     Shock        g         5       |     30
       seek          35.0 W     Rotation   RPM      4002
       read/write         W     Acoustic   dBA        50
       spin-up            W     ECC        Bit
                                MTBF         h     150000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates     CSA,IEC380,IEC950,TUV,UL47...

**********************************************************************
                        L   A   Y   O   U   T
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HEWLETT  HP 9754X  INSTALLATION GUIDE PRELIMINARY EDITION JULY 1989

  +---------------------------------------------------------+  1
  |                 +--------+Factory                     +1|XX
  |          DON'T  +--------+Test                        |||XX
  |          USE!                                         ++|XX
  |                                             Terminator+1|XX
  |                                             Packs     |||XX J1
  |                                                       ++|XX
  |                                                       +1|XX
  |                                                       |||XX
  |                                                       ++|XX
  |                                                         |+-J4
  |                                                         || |
  |                                                         || |
  |                                                         |+-+1
  |                                                         |+-1
  |                                                         |XX
  |                                                         |XX J2
  +---------------------------------------------------------+  1








  +-+-------------------------------------------------------------+-+
  | |                                                             | |
  | |                                                             | |
  | |                                                             | |
  | |                                                             | |
  | |                                                             | |
  | |                                                             | |
  | +-------------------------------------------------------------+ |
  | O          J3xxxFrame Ground O                                O |
  ++------------------------------------------------------------+--++
  +++--J2---+ 4+1234567+ +---SCSI-Connector---J1-------------1+-+--++
  | |1 2 3 4|::|:::::::| |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX|     |
  |-+-------+1-+---J4--+-++----------++----------++----------++-PCA-|
  +--        ||           +----------1+----------1+----------1     -+
            +++                 +------------+----------+
           Synchronized            Terminator Packs
           Spindle Pins



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
HEWLETT  HP 9754X  INSTALLATION GUIDE PRELIMINARY EDITION JULY 1989

 Jumper Setting
 ==============

 J4  Option/Address Connector
 ----------------------------
 The Option/Address connector located on the drive electronics/
 controller PCA-A2 is a 7 pin-set connector used to establish the
 options and select SCSI address. The disk drive is shipped from the
 factory with a shorting jumper across all seven pin-sets. This sets
 up a SCSI address of 7, enables drive initiation of a Synchronous
 Data Transfer Request message, enable parity check, and activates
 auto spin up. If you remove any of the shorting jumpers, save them
 for future use. If lost, DO NOT remove aby shorting jumper for the
 factory test connector on the side of the PCA.

 CAUTION
 DO NOT REMOVE ANY SHORTING JUMPERS FROM THE FACTORY TEST CONNECTOR!!!

   +1+2+3+4+5+6+7+
   |:|:|:|:|:|:|:|
 --+-+-+-+-+-+-+-+--
 +----+--------------------------------------------------------------+
 |Pin | FUNCTION (0 = OPEN, 1 = SHORT)                               |
 |Set |                                                              |
 +----+--------------------------------------------------------------+
 |1   |RESERVED (Normally shorted)                                   |
 +----+--------------------------------------------------------------+
 |2   |Drive initiation of SDTR message                              |
 |    |0 = inhibit initiation of SDTR message                        |
 |    |1 = Enable initiation of Power On and Reset                   |
 +----+--------------------------------------------------------------+
 |3   |Parity                                                        |
 |    |0 = Parity checking is disabled                               |
 |    |1 = Parity checking is enabled                                |
 +----+--------------------------------------------------------------+
 |4   |Auto spin up                                                  |
 |    |0 = Drive will not spin up until host sends start unit command|
 |    |1 = Drive will automatically spin up on power on              |
 +----+--------------------------------------------------------------+
 |5-7 |SCSI address                                                  |
 |    |              PIN SETS                                        |
 |    |SCSI ID|   5   |   6   |   7   |                              |
 |    |-------+-------+-------+-------+                              |
 |    |    0  | OPEN  | OPEN  | OPEN  |                              |
 |    |    1  | OPEN  | OPEN  | CLOSED|                              |
 |    |    2  | OPEN  | CLOSED| OPEN  |                              |
 |    |    3  | OPEN  | CLOSED| CLOSED|                              |
 |    |    4  | CLOSED| OPEN  | OPEN  |                              |
 |    |    5  | CLOSED| OPEN  | CLOSED|                              |
 |    |    6  | CLOSED| CLOSED| OPEN  |                              |
 |    |    7  | CLOSED| CLOSED| CLOSED|                              |
 +----+--------------------------------------------------------------+


 Synchronous Data Transfer Request (SDTR)
 ----------------------------------------
 When pin-set 2 is shorted (1 position) the drive will initiate an
 SDTR message at power on and RESET. When open (0 position) the drive
 will not initiate an SDTR message. The drive will respond to a host-
 initiated an SDTR message whether this pin-set is open or shorted.


 Parity Option Setting
 ---------------------
 When pin-set 3 is shorted (1 position), the disk drive checks parity
 on commands and data. When open (0 position), the disk drive does not
 check for parity. Parity bits are generated whether this pin-set is
 open or shorted.


 Auto Spin Up Option
 -------------------
 When pin-set 4 is shorted (1 position), the disk drive will auto-
 matically spin up at power on. If open (0 position), the drive will
 not spin up until the Initiator send a START UNIT command. When not
 in the auto spin up mode the drive will return "Not Ready" to all
 commands except REQUEST SENSE, INQUIRY, RESERVE, RELEASE, and START
 UNIT until the drive is ready for access.


 Terminator Resistor Packs
 -------------------------
 The drive is shipped with three terminator resistor packs installed.
 The packs are located on the bottom of the drove electronics/
 controller PCA-A2. When installing multiple drives on an SCSI
 channel, the packs must be removed from all but the last drive in the
 chain. The drives can be ordered from the factory with the packs re-
 moved. (When re-installing the packs, ensure that they are properly
 keyed into their connectors.


 Termination Power Source
 ------------------------
 There are three orderable options for the +5V terminator power
 source:

 - The drive supplies the +5V to th eon-board terminators only.

 - The drive supplies the +5V to the on-board terminators and to pin
   26 of the SCSI connector.

 - The host or initiator supplies the +5V to pin 26 of the SCSI
   connector for the on-board terminators.


 Synchronized Spindle Pins
 -------------------------
  +2-4+      Pin 1 GROUND
  |o o|      Pin 2 MASTER SYNC
  |o o|      Pin 3 RESERVED
 -+1-3+---   Pin 4 SLAVE SYNC



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                      I   N   S   T   A   L   L
**********************************************************************
HEWLETT  HP 9754X  INSTALLATION GUIDE PRELIMINARY EDITION JULY 1989

 Notes on installation
 =====================

 Drive mounting
 --------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x
      UNACCEPTABLE!                                UNACCEPTABLE!
      Never install PC board on the Top!


 Mounting Instructions
 ---------------------
 Do not mount the disk drive in a front down or back down position.

 Since each design installation of the product can be unique, the
 following information should be taken into consideration when mount-
 ing the product. The disk drive can be mounted on either side, or the
 bottom.


 Physical Mounting
 -----------------
 Typically the disk drive is fastened directly to a hassis with 6/32
 screws. Use the following mounting information.

 NOTE
 There are eight (8) threaded mounting holes (for 6/32 threads) on the
 disk drive: two on each side, and four on the bottom.

 - When mounted, the hardware must not protrude more than 3 mm (0.12
   in.) beyond the disk drive frame.

 - Use 6/32 screws that are torqued to 10 inch pounds.

 - The bottom of the disk drive has exposed voltages. Allow at least
   3 mm (0.12 in.) between the bottom of the disk drive and any
   electrical conducting surface.


 Shock and Vibration Sway Space
 ------------------------------
 To meet the Shock and Vibration Specifications, allow at least 3 mm
 (0.12 in.) around the physical limits of the disk drive. This space
 may have to be adjusted for air flow to maintain temperature
 specifications.


 Airflow Requirements
 --------------------
 Airflow is required to improve disk drive reliability. Better
 reliability will be achieved with lower operating temperatures. The
 disk drive can be cooled by either forced air of natural cooling.
 Forced air may be necessary if the disk drive is located within a
 cabinet or other enclosure. If forced air cooling is not used, the
 disk drive must be located such that internal heat is conducted away
 from the drive and no outside heat sources raise the operating
 temperature.

 As a guideline, the estimated front to back airflow to prevent
 exceeding the maximum operating temperature at a 50*C ambient
 temperature is 225 linear feet per minute. This is a function of the
 specific airflow pattern inside the cabinet where the disk drive is
 installed. This airflow estimate is to serve a guideline.

 As an additional guideline, the airflow should be adjusted to prevent
 the temperature of the critical components listed below from exceed-
 ing the maximum temperature specified.

 - U102, large custom VLSI package maximum case temperature is 80*C.

 - Head disk assembly (HDA) casting, left side maximum casting
   temperature is 60*C.


 J1  SCSI Connector
 ------------------
 An unshielded 50-pin SCSI connector (J1) is located on the rear of
 drive electronics/controller PCA-A2. The physical construction and
 pin assignments for this connector conform to the SCSI specification
 for single-ended driver and differential driver configurations,


 J2  DC Power Connector
 ----------------------
 The power connector (J2) on the rear of drive electronic/controller
 PCA-A2 provides connection for dc power used by the drive.

 +-----------------------
 | +------------+ +----   pin 1  +12V DC   5%
 | | 1  2  3  4 | | 1     pin 2   GND
 | +------------+ +--     pin 3   GND
 +------------------      pin 4   +5V DC   5%


 J3  Frame Ground Connector
 --------------------------
 The frame ground connector (J3) provides the ground contact to the
 drive chassis. This is a Faston (R) type connector.


 Mating Connector Requirements
 -----------------------------
 The nonshielded SCSI device connector shall be a 50-conductor
 connector consisting of two rows of 25 male pins with adjacent pins
 2.54 mm (0.1 in.) apart. It is recommended that keyed connectors be
 used.

 The recommended mating connector manufacturer's part number are as
 follows:
 +-------------------------------+----------------------------------+
 |Disk Drive Connector/Function  |Recommended Mating Connector      |
 +-------------------------------+----------------------------------+
 |J1-SCSI Connector              |3M 3425-6600                      |
 |(single ended and differential)|                                  |
 +-------------------------------+----------------------------------+
 |J2-DC Power                    |AMP 1-480424-0                    |
 +-------------------------------+----------------------------------+
 |J3-Frame Ground                |AMP 62187-1                       |
 +-------------------------------+----------------------------------+
 |J4-Options Connector           |AMP 531220-3                      |
 |   Shorting Jumper             |(7 supplied with the disk drive,  |
 |                               |Manufacturer supplies rails of 10)|
 +-------------------------------+----------------------------------+


 Cable Requirements
 ------------------
 The disk drive adheres to the cabling requirements and limitations
 set forth in the ANSI SCSI specifications.

 Refer to the SCSI specifications for details.

 - Cables with a characteristic impedance of 100 ohm   10% are
   recommended for unshielded flat or twisted-pair ribbon cable.

 - Cables with a characteristic impedance of 90 ohms   10% are
   perferred for shielded cable.

 - To minimise discontinuities and signal reflections, do not use
   cable with different impedances on the same bus.

 - A minimum cable size of 28 AWG should be used to minimise noise
   effects and ensur eproper distribution of termination power.

 - Cables should be properly terminated.


 Single-ended Cable
 ------------------
 For disk drives with single-end output, use the following cable
 information.

 - A 50-conductor flat cable or 25-signal twisted-pair cable should be
   used. Cable length shall be equal or less than 6.0 metres. This
   refers to internal and external cable length (except stubs).

 - A stub length of no more than 0.1 metre is allowed off the main
   line interconnection withim any connected device.


 Differential Cable
 ------------------
 For disk drives with differential output, use the following cable
 information.

 - A 50-conductor flat cable or 25-signal twisted-pair cable should be
   used. Cable length shall be equal to or less than 25 metres. This
   refers to internal and external cable length (except stubs).

 - A stub length of no more than 0.2 metre is allowed off the main
   line interconnection within any connected device.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
HEWLETT  HP 9754X  INSTALLATION GUIDE PRELIMINARY EDITION JULY 1989


 General Description
 -------------------
 The HP9754XS (SCSI Single-Ended Interface) and the HP9754XD (SCSI
 High Performance Differential Interface) Disk Drives are reliable,
 low cost, high capacity, high performance, random access mass storage
 devices. Each product utilises sputtered thin-fim 5.25-inch disks as
 storage media. Each disk has 1457 tracks per surface. The total un-
 formatted capacity of the disk drives is 396.6 MB for 4-disk 97544S/D
 and 793.2 MB for the 8-disk 97548S/D. This translates to 331.9 and
 663.8 MB formatted user capacity, respectively.

 Low cost, high capacity and reliability are achieved by the use of
 advanced electronics and by embedding the servo and data information
 on the same track. Embedded servo allows the same electronics to be
 used for both servo control and reading of user data; this results in
 reduced component count and lower overall drive cost. Embedded servo
 also greatly reduces head alignment problems and makes it possible to
 achieve an industry leadership with greater than 1600 tracks per
 inch.

 High performance (16.5 msec random average seeks) while still main-
 taining relatively low power is achieved by using a state-of-the-art
 Hewlett-Packard designed actuator. This sophisticated actuator design
 combines the performance benefits of a linear actuator with the
 reliability and cost benefits of the traditional rotary actuator.

 The disk drive electrical interface is compatible with the industry
 standard Small Computer System Interface (SCSI). The drive is
 identical to the 5.25-inch minifloppy in size and voltage require-
 ments.


 Key features of the HP 9754XS/D Disk Drives include:

 - High reliability (150,000 hours MTBF)

 - High performance embedded SCSI controller

 - Extensive use of HP's state-of-the-art VLSI processes

 - Fourth generation of Hewlett-Packard designed embedded servo
   mechanisms.

 - High performance Hewlett-Packard designed actuator


 Options
 -------
 The following options are available:

 - Orderable with or without a front bezel
 - Orderable with or without a bottom cover
 - Orderable with or without terminator resistor packs
 - Orderable with or without a front panel LED indicator
 - Three terminator options:
   - The drive supplies +5V to the on-board terminators only
   - The drive supplies +5V to the on-board terminators, and to pin 26
     of the SCSI Connector (J1)
   - The host or initiator supplies +5V to pin 26 of the SCSI
     Connector (J1) for the on-board terminators.


 Specials
 --------
 For customer needs that differ from the products described in this
 manual, Hewlett-Packard can provide specially modified products.
 These modifications are ordered defined, engineered, and manufactured
 under "special" contract negotiations.


 Front Panel LED Indicator
 -------------------------
 The light emitting diode (LED) indicator on the front of the disk
 drives displays the status of the power-on diagnostics. As the disk
 drive progresses through the diagnostics, the LED will present the
 following displays:

 1. LED ON
 When poser is first applied, the power-on reset from the drive hard-
 ware illuminates the LED. Th eLED remains lit until extinguished by
 the microprocessor on the drive electronics/controller PCA-A2. If the
 LED remains on, a catastrophic failure has occurred. The most pro-
 bable cause is a failure of the drive electronics/controller PCA-A2.

 2. LED OFF
 Once the servo processor has tested itself and its internal RAM, the
 LED is extinguished. The LED remains off for approximately 1 second,
 during which time the processor performs additional hardware tests
 and establishes various operating parameters.

 3. LED ON
 The LED illuminates indicating that the spindle motor is being
 started. The LED remains lit until the spindle is up to speed.

 4. LED FLASHES
 This indicates that the controller is performing its internal
 diagnostic tests. Because of the duration of these test, this LED
 pattern may not even be seen. If the LED continues to blink at a rate
 of 1 Hz, the controller has failed some portion of these tests.

 Once the power-on diagnostics have completed, the LED functions as an
 activity light. The LED will illuminated at any time the disk drive
 is executing a command, reading, or writing. If the LED is
 extinguished, the drive is idle.


 Serial Number
 -------------
 Each drive carries a serial number. Keep a record of all serial
 numbers. If your drive is lost or stolen, the serial number is often
 necessary for tracing and recovery, as well as for insurance claims.


