M 3 0 1 2    MINISCRIBE

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                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     612|     |     |
Capacity form/unform    10/   12 MB        Heads           2|     |     |
Seek time   / track  99.9/ 3.0 ms          Sector/track   17|     |     |
Controller           MFM / ST412           Precompensation   128
Cache/Buffer               KB              Landing Zone
Data transfer rate    0.625 MB/S int       Bytes/Sector      512
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         4 46    |    -40 57
Power: sleep              W     Humidity     %         8 80    |      8 80
       standby            W     Altitude    km    -0.061  3.048|        12.192
       idle          18.0 W     Shock        g         4       |     40
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        50
       spin-up            W     ECC        Bit
                                MTBF         h      10000
                                Warranty Month
Lift/Lock/Park     NO           Certificates     CSA,FCC,UL1950


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                        L   A   Y   O   U   T
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MINISC.  3012  PRODUCT MANUAL P/N 1002 REV. B, 2/8/1984

  +---------------------------------------------------------+
  |                                     Terminator--++---+  |XX
  |                                              |  ||   |  |XX P2
  |                                              +--+|   |  |XX
  |                                                  +---+  |XX
  |                                                  Shunt  |  1
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX P1
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |  1
  |                                                         |XX P3
  |                                                         |XX Power
  +---------------------------------------------------------+



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                      J   U   M   P   E   R   S
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MINISC.  3012  PRODUCT MANUAL P/N 1002 REV. B, 2/8/1984

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

 Drive Selection
 ---------------
 As shipped, the 16-pin shunt block has all pin pairs shorted with the
 "Radial" option selected. To select the desired drive number in a
 daisy-chain operation, refer to the following table.


                      Drive select number
 Pin    Pair       1      2      3      4
 ---------------------------------------------
  8   -   9        CLOSED OPEN   OPEN   OPEN
  7   -  10        OPEN   CLOSED OPEN   OPEN
  6   -  11        OPEN   OPEN   CLOSED OPEN
  5   -  12        OPEN   OPEN   OPEN   CLOSED
  1   -  16        OPEN   OPEN   OPEN   OPEN


 Radial Option
 -------------
 As shipped, the 16-pin shunt block has pin pair 1/16 shorted result-
 ing in a radial operation. In this case, all input and output signals
 are enabled, even if the drive is not selected. However, the front
 panel LED will not be on. -DRIVE SELECT must be active to light the
 LED. When pin pair 1/16 is open the drive is in a daisy chain mode
 where output signals are active when the appropriatte -DRIVE SELECT
 line is activated.


 Drive Exercise Option
 ---------------------
 As shipped, the 16-pin shunt block has pin pair 2/15 open. This shunt
 when shorted will initiate drive exercise routines.

 The microprocessor performs "wake uo" diagnostics upon application
 of power. If an error is detected, the processor will flash an
 warning by blinking the Activity LED. Some errors are fatal in that
 they do not return to the program until power is cycled.

 If no errors are detected, the processor tests the shunt block to
 determine the state of pin pair 2/15 (drive exercise option).

 If pin pair 2/15 is open, the drive will become ready. During
 normal operation, the drive will continue to monitor some functions
 such as soin speed and indicate an error if it occurs.

 If pin pair 2/15 is shorted, the drive will enter the exerciser
 routine.

 The drive then does a seek to the shipping zone and turns the LED on
 solid. The heads will remain at the shipping zone for 5 seconds
 during which time the drive can be powered down for shipment. At the
 end of the 5 second period the drive will initiate an actuator
 exercise routine which does a random seek for approximately 5 days.


 Terminators
 -----------
 Each drive is shipped with a terminator pack providing the 220/330
 ohm termination for the Control Input Signals. If multiple drives are
 configured in a daisy-chain, the terminator pack must be removed from
 all drives except the last unit on the daisy chain.



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                      I   N   S   T   A   L   L
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MINISC.  3012  PRODUCT MANUAL P/N 1002 REV. B, 2/8/1984

 Notes On Installation
 =====================

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

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
      x           x                |  |     |           |     |  |
 +------x------x-------+           |  +-----+           +-----+  |
 +-+------x--x-------+-+           +--+                       +--+
   |       xx        |
   |     x    x      |
   +---x--------x----+
     x            x


 Recommended Mounting Configuration
 ----------------------------------
 The MiniScribe 3012 half height drive is designed to be used in
 applications where the unit experience shock and vibrations at
 greater levels than larger and heavier disk drives.

 To take full advantage of the shock mounts, it is necessary to
 provide a 0.1 inch clearance on both the top and bottom of the drive.
 This clearance allows for movement of the drive during acceleration.
 This implies that if the drive is mounted by the bottom mounting
 holes on a flat surface, standoffs are needed under the mounting
 holes. No special considerations are required if the drive is mounted
 using the side mounts except for the clearance on top and bottom. The
 drive may be mounted in any attitude except upside down.

 The drive is mounted using 6-32 UNC tap screws, 1/4 inch maximum
 penetration. The customer should allow adequate ventilation to the
 drive to insure reliable drive operation over the operating
 temperature range.


 Cabling
 -------
 Connect interface cables with connectors P1, P2, P3 and P4 to J1, J2,
 J3 and J4 respectively. If multiple drives are to be interconnected,
 remove the terminator packs in all but the last drive in the daisy
 chain.



 J1/P1 Control Signal Connector
 ------------------------------
 Connection to P1 is through a 34 pin PCB edge connector. The pins are
 numbered 1 through 34 with the odd pins located on the component side
 of the Printed Circuit Board A key slot is provided between pins 4
 and 6.

 The recommended mating connector (J1) is AMP Ribbon Connector P/N
 88373-3.


 J2/P2 Data Signals Connector
 ----------------------------
 Connection to P2 is through a 20 pin edge connector. The pins are
 numbered 1 through 20 with the odd pins located on the component side
 of the Printed Circuit Board. A key slot is provided between pins 4
 and 6.

 The recommended mating connector (J2) is AMP Ribbon Connector, P/N
 88373-6.


 P3 DC Power Connector
 ---------------------
 DC power connector (P3) is a 4 pin AMP Mate-N-Lok Connector, mounted
 on the PCB.

 The recommended mating connector (P3) is AMP P/N 1-480424-0 utilizing
 AMP pins P/N 350078-4.

       +------------+   Pin 1  +12 Volts DC
       | 4  3  2  1 |   Pin 2  +12V Ground Return
       +------------+   Pin 3  +5V Ground Return
                        Pin 4  +5 Volts DC


 J4/P4 Frame Ground Connector
 ----------------------------
 Fasten AMP P/N 61761-2.

 Recommended mating connector (J4) is AMP P/N 62187-1.

 If used, the hole in P4 will accommodate a wire size of 18 AWG max.


 Electrical Interface
 --------------------
 The interface to the MiniScribe 3012 can be divided into three
 categories each of which is physically separated: Control Signals,
 Data Signals and DC Power.

 All control Signals are digital in nature (open collector TTL), and
 either provide signals to the drive (input) or signals to the
 collector (output). The Data Signals are differential in nature and
 provide data either to (write) or from (read) the drive.

 The interconnect cable between the drive and controller may be
 flat ribbon or twisted pairs of a length not to exceed 20 feet. The
 signal return lines and ground lines for P1 and P2 should be grounded
 at the controller.

 The voltage return lines of P3 should only be grounded at the power
 supply.

 Connector J4/P4 is a spade lug connector tied to frame ground.


 Drive Mechanism
 ---------------
 A brushless DC direct drive motor rotates the spindle at 3600 rpm.
 The motor/spindle assembly is dynamically balanced to provide minimal
 mechanical runout to the disks. A dynamic brake is used to provide a
 fast stop to the spindle motor when power is removed.


 Air Filtration System
 ---------------------
 Within the sealed enclosure, a 0.3 micron filter coupled with a
 breather filter provides over the drive life a clean, above
 atmospheric pressure environment to the heads and disks.


 Head Positioning Mechanism
 --------------------------
 Two read/write heads are supported by a carriage mechanism coupled
 to the rotation stepper motor through a rack-and-pinion motion
 translator. The rack-and-pinion translator allows for the increased
 number of data tracks while retaining the full step holding torque
 and positioning repeatability characteristics of the stepper motor.


 Power Sequencing
 ----------------
 +5 volts DC and +12 volts DC may be applied in any order.

 +12 VDC powers the spindle drive motor. The microprocessor verifies
 that the disks are spinning at 3600 rpm and then activates the
 automatic Track Zero positioning. -TRACK ZERO, -SEEK COMPLETE, and
 -READY will beome true upon completion of the Track Zero positioning
 sequence.


 Cable Interconnection - 4 Drive System
 --------------------------------------

   +-----------+                                +-----------------+
   |           +---o---Control------------------+P1     Drive 1   |
   |           |   |    +-------Data------------+P2               |
   |           |   |    |             +-Power---+P3  P4    ...    |
   |           |   |    |             |         +-----+-----------+
   |           |   |    |             |    +-Frame----+
   |           |   |    |             |    |    +-----------------+
   |Controller |   o----+-------------+----+----|P1     Drive 2   |
   |           |   |    | +-----------+----+----+P2               |
   |           |   |    | |           o----+----+P3  P4    ...    |
   |           |   |    | |           |    |    +----+------------+
   |           |   |    | |           |    o---------+
   |           |   |    | |           |    |    +-----------------+
   +-----------+   o----+-+-----------+----+----+P1     Drive 3   |
   |           |   |    | | +---------+----+----+P2               |
   |           +---+----+ | |         o----+----+P3  P4    ...    |
   |           +---+------+ |         |    |    +-----+-----------+
   |           |   |        |         |    o----------+
   |Data       +---+--------+         |    |    +-----------------+
   |Separator  |   +------------------+----+----+P1     Drive 4   |
   |           +----------------------+----+----+P2               |
   |           |                      o----+----+P3  P4    XXX    |
   +-----------+                      |    |    +-----+-----------+
                       DC voltages----+    o----------+
                                           |
                       Frame Ground--------+


 ... = Terminator Pack removed

 XXX = Terminator Pack installed


 Caution/Warning
 ---------------
 The Miniscribe 3012 is a precision product weighing 5.5 lbs. During
 handling the unit must not be dropped, jarred or bumped. Otherwise,
 damage to the heads and disks may occur.



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                      F   E   A   T   U   R   E  S
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MINISC.  3012  PRODUCT MANUAL P/N 1002 REV. B, 8/2/1984


 Introduction
 ------------
 The MiniScribe 3012 is a half-height random access 5-1/4 inch rigid
 media disk drive employing Winchester technology. The drive utilizes
 a rack-and-pinion actuator, microprocessor control, and open loop
 stepper head positioning.

 The Model 3012 features power up diagnostics, head shipping zone,
 buffered seek and 5 Megabit/Sec. transfer rate. D.C. voltages and
 physical form factor are the same as the 5-1/4 inch half height
 floppy disk drive.


 Seek Time (including settling time)
 -----------------------------------
       +----------------------------------+--------+
       |                                  | 3012   |
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |  3     |
       +----------------------------------+--------+
       |Average                msec. typ. | 160    |
       |                       msec. max. | 420    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.33 |
       +----------------------------------+--------+


 Track Zero Detector
 -------------------
 The Track Zero Detector resides on the stepper motor. This optical
 sensor consists of a light source (activated only when a seek is
 initiated) and a receiver which when blocked by an interrupter on the
 motor shaft indicates one of several logical Track Zero positions.
 The microprocessor determines the physical location of Track Zero
 from the redundant logical Track Zeros.


 Media Defect Criteria (as shipped from MiniScribe)
 --------------------------------------------------
 Model 3012   20 defects maximum
              < 2 bytes in length
              Cylinder Zero Defect Free


 Error Messages
 --------------
 The microprocessor performs wake up diagnostics on power up.
 Additionally, some operations are monitored during normal operations.
 If an error is detected, the microprocessor will flash a warning by
 blinking the activity LED.

    Zero                  = 0.1 second flashing mode
    One                   = 0.6 second continuous ON mode
    Between Bits          = 0.6 second Off
    Between Repeat Cycles = 2.0 second Off

 Listed Below are the binary to hexadecimal conversion values:

  0 = 0000   4 = 0100   8 = 1000   C = 1100
  1 = 0001   5 = 0101   9 = 1001   D = 1101
  2 = 0010   6 = 0110   A = 1010   E = 1110
  3 = 0011   7 = 0111   B = 1011   F = 1111


 Message Definitions
 -------------------
 Code 0 - Microprocessor RAM error
 Code 1 - Microprocessor ROM checksum error
 Code 5 - Unable to detect motor spinning
 Code 6 - Spin motor failed margin test
 Code 7 - Unable to maintain spin speed
 Code 8 - Unable to uncover Track 000 sensor
 Code 9 - Unable to cover Track 000 sensor
 Code A - Interrupter Phase Error (factory phase adjust)