
M 3 4 2 5    MINISCRIBE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     615|     |     |
Capacity form/unform    20/   25 MB        Heads           4|     |     |
Seek time   / track  85.0/15.0 ms          Sector/track   17|     |     |
Controller           MFM / ST506           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 50    |    -40 57
Power: sleep              W     Humidity     %         8 80    |      8 80
       standby            W     Altitude    km    -0.061  3.048|        12.192
       idle          14.5 W     Shock        g         4       |     40
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        50
       spin-up            W     ECC        Bit
                                MTBF         h      20000
                                Warranty Month
Lift/Lock/Park     NO           Certificates     CSA,FCC,UL478                

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MINISC.  3425/3212PLUS  PRODUCT MANUAL P/N 1008 REV. H, MAY 6, 1987

  +-------------------------------------------------------+
  |                                                       |XX Power
  |                                                       |XX
  |                                                       |
  |                                                       |XX
  |                                                       |XX Control
  |                                                       |XX Cable
  |                                                       |XX J1
  |                                                       |XX
  |                                                       |XX
  |                                                    TERMXX
  |                                                 +-8 ++|
  |                                              DIP| | |||XX
  |                                                 | | |||XX
  |                                                 | | |||XX
  |                                                 | | |||XX Data
  |                                                 | | |||XX Cable
  |                                                 +-1 RP1XX J2
  +-------------------------------------------------------+



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MINISC.  3425/3212PLUS  PRODUCT MANUAL P/N 1008 REV. H, MAY 6, 1987

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

 Drive Selection Configuration
 -----------------------------

            Drive Select No.            1 2 3 4 5 6 7 8
     |  1   |  2   |  3   |  4         +---------------+
 ----+------+------+------+------   ON |x x x x x x x x|
 SW8 |CLOSED|OPEN  |OPEN  |OPEN     OFF+---------------+
 SW7 |OPEN  |CLOSED|OPEN  |OPEN         xxxxxxxxxxxxxxx RP1
 SW6 |OPEN  |OPEN  |CLOSED|OPEN                         Terminator
 SW5 |OPEN  |OPEN  |OPEN  |CLOSED

 As shipped, the DIP switch has Drive 1 selected (SW8 CLOSED).


 Drive Exercise Options
 ----------------------
 As shipped, the DIP switch has SW2, SW3, and SW4 closed. These
 switches are for factory test modes and must remain closed for normal
 operation.


 Actuator Exerciser Modes
 ------------------------
 The microprocessor performs "wake up" diagnostics upon application of
 power. If an error is detected, the processor will flash a warning by
 blinking the Activity LED. Some errors are fatal 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 SW2, SW3, and SW4 (Drive Exercise Options).

 Actuator Exerciser Modes:

 SW2         SW3        SW4
 CLOSED      CLOSED        X         Normal Operation
 CLOSED      OPEN          X         Factory Use Only
 OPEN        CLOSED     OPEN         Random Seek (burn-in mode)
 OPEN        CLOSED     CLOSED       Random Seek
 OPEN        OPEN       OPEN         Cresendo Seek (burn-in mode)
 OPEN        OPEN       CLOSED       Cresendo Seek


 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 configuration, the terminator pack must
 be removed from all drives except the last unit on the daisy chain.



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MINISC.  3425/3212PLUS  PRODUCT MANUAL 1008 REV. H, MAY 6, 1987

 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!


 Recommended Mounting Configuration
 ----------------------------------
 The MiniScribe 3425/3212P half height drive is designed to be used in
 applications where the unit may experience shock and vibrations at
 greater levels than larger and heavier disk drives.

 Two features which allow greater shock tolerances are the use of
 rugged media and shock mounts. To take full advantage of the shock
 mounts, however, it is necessary to provide a 0.1 inch clearance on
 both the top and bottom of the drive. This clearance allows for move-
 ment of the drive during acceleration. This implies that if the drive
 is mounted by the bottom mounting holes on a flat surface, stands-off
 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 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.

 Screws: 6-32 UNC


 Mechanically Isolated Mounting Points
 -------------------------------------
 Four side mounting and four base mounting points are provided to the
 customer. Each mounting point is mechanically isolated from the
 drive. Additionally, four side mounting points are provided that are
 compatible with a half height floppy disk drive.


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


 Magnetic Field
 --------------
 The externally induced magnetic flux density may not exceed 3 Gauss
 as measured at the disk surface.


 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 environment to
 the heads and disks.


 Head Positioning Mechanism
 --------------------------
 Two or four read/write heads are supported by a carriage mechaism
 coupled to the 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.


 Electrical Interface
 --------------------
 The interface to the MiniScribe 3425/3212P can be divided into three
 categories, each of which are physically separated: Comtrol 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
 controller (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 P4 is a spade lug connector tied to frame ground.


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

       HOST
   +-----------+                                +-----------------+
   |           +---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


 P1 Connector - Control Signals
 ------------------------------
 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 componet side
 of the printed circuit board. A key slot is provided betweeen pins 4
 and 6.

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


 P2 Connector - Data Signals
 ---------------------------
 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 Connector - DC Power
 -----------------------
 DC power connector (P3) is a 4 pin AMP Mate-N-Lok connector, mounted
 on the PCB. The P3 connector is mounted on the component side of the
 PCB.

 The recommended mating connector (J3) is AMP P/N 1-480424-0 utilizing
 AMP pins P/N 350078-4.

      +-----P3-----+   pin 1    +12 VDC
      | 4  3  2  1 |   pin 2    +12 Ground Return
      +------------+   pin 3    + 5 Ground Return
                       pin 4    + 5 VDC


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

 The recommended mating connector (J4) is AMP 62187-1.

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


 Caution/Warning
 ---------------
 The Miniscribe drive is a precision product weighing 3.5 pounds.
 During handling the unit must not be dropped, jarred or bumped.
 Otherwise, damage to the heads and disks may occur. When the drive is
 removed from the Miniscribe shipping container and not immediately
 secured within a chassis through its shock mounts, it must be stored
 on a soft padded surface.

 Failure to comply with the above procedure will render null and void
 all warranties.



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MINISC.  3425/3212PLUS  PRODUCT MANUAL P/N 1008 REV. H, MAY 6, 1987


 Introduction
 ------------
 The MiniScribe 3425/3212P 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 3425/3212P features power up diagnostics, 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)
 -----------------------------------
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |  15    |
       +----------------------------------+--------+
       |Average                msec. typ. |  85    |
       |                       msec. max. | 190    |
       +----------------------------------+--------+
       |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 3425   30 defects maximum per drive
              10 defects maximum per surface

 Model 3212P  20 defects maximum per drive
              Defects < 2 bytes in length
              Defects may be continguous
              Cylinder Zero Defect Free for
              both models.


 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.

 Error codes may be generated by the microprocessor to indicate hard-
 ware failures or warnings that are detected during power-on
 diagnostics, burn-in mode, or normal operation. Error codes are
 diaplayed in a "morse-code" type manner. Bits may be interpreted
 and converted into hexadecimal error codes. "Zeros" are indicated by
 a short (1/2 second) flashingn mode. "Ones" are indicated by a short
 (1/2 second) continuous ON mode. Error "Words" are separated by a one
 second LED off time.

    Zero                  = 0.5 second flashing mode
    One                   = 0.5 second continuous ON mode
    Between Bits          = 0.5 second Off
    Between Repeat Cycles = 1.0 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 2 - Interface chip diagnostic failure
 Code 3 - Write Fault latch will not reset
 Code 4 - Index pulse not detected during spinup
 Code 5 - Unable to reach 3600 rpm in 30 seconds
 Code 6 - Unable to stabilize spin speed in 10 seconds
 Code 7 - Unable to maintain spin speed to 0.5%
 Code 8 - Unable to uncover Track Zero sensor
 Code 9 - Unable to cover Track Zero sensor
 Code A - Track Zero interrupter misadjusted
 Code B - Shipping zone error, crash stop misadjusted
 Code C - Carriage stuck during recal error
 Code D - Seek errror during burn-in or recal
 Code E - Unused
 Code F - Unexpected interrupt from processor


