M 3 6 5 0    MINISCRIBE

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                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     809|     |     |
Capacity form/unform    42/   50 MB        Heads           6|     |     |
Seek time   / track  61.0/15.0 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               W     Shock        g         5       |     40
       seek          18.1 W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        50
       spin-up            W     ECC        Bit
                                MTBF         h      15000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,FCC,TUV,UL1950           

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                        L   A   Y   O   U   T
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MINISC.  3425P/3438P/3650/3675  PRODUCT DESCRIPTION

  +-------------------------------------------------------+
  |                                                       |XX Power
  |                                                       |XX
  |                                                       |
  |                                                       |XX
  |                                                       |XX Control
  |                                                       |XX Cable
  |                                                       |XX J1
  |                                                       |XX
  |                                                       |XX
  |                                                       |XX
  |                                               DS0+-+  |
  |                                               DS1| |  |XX
  |                                               DS2| |  |XX
  |                                               DS3| |  |XX
  |                                               JP3| |  |XX Data
  |                                +RP1------+    JP2| |  |XX Cable
  |                                +---------+    JP1+-+  |XX J2
  +-------------------------------------------------------+



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                      J   U   M   P   E   R   S
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MINISC.  3650  PRODUCT MANUAL 1076 REV. A, APRIL 7, 1987

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

 Drive Select
 ------------
 +-----------------+---------+-------+-------+-------+
 |                 |   DS0   | DS1   | DS2   | DS3   |
 +-----------------+---------+-------+-------+-------+
 |Drive Select 0   |  CLOSED | OPEN  | OPEN  | OPEN  |
 +-----------------+---------+-------+-------+-------+
 |Drive Select 1   |   OPEN  | CLOSED| OPEN  | OPEN  |
 +-----------------+---------+-------+-------+-------+
 |Drive Select 2   |   OPEN  | OPEN  | CLOSED| OPEN  |
 +-----------------+---------+-------+-------+-------+
 |Drive Select 3   |   OPEN  | OPEN  | OPEN  | CLOSED|
 +-----------------+---------+-------+-------+-------+
 As shipped, the jumper is set to Drive 0 selected.


 Drive Excersice Options
 -----------------------
 As shipped, there are jumpers on JP1, JP2 and JP3. JP1 and JP2
 jumpers are for factory test modes and must remain on for normal
 operation. JP3 is the park feature enable, it must be installed to
 use the 30 second park feature.


 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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                      I   N   S   T   A   L   L
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MINISC.  3650  PRODUCT MANUAL 1076, REV. A, APRIL 7, 1987

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

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

     horizontally             vertically
   +-----------------+   +--+             +--+
   |                 |   |  +-----+ +-----+  |
   |                 |   |  |     | |     |  |
 +-+-----------------+-+ |  |     | |     |  |
 +---------------------+ |  |     | |     |  |
                         |  |     | |     |  |
      x           x      |  |     | |     |  |
 +------x------x-------+ |  +-----+ +-----+  |
 +-+------x--x-------+-+ +--+             +--+
   |       xx        |
   |     x    x      |
   +---x--------x----+
     x            x
      UNACCEPTABLE!


 Recommended Mounting Configuration
 ----------------------------------
 The MiniScribe 3650 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.


 Cabling
 -------
 Connect interface cables with connectors P1, P2, P3, and P4 to J1,
 J2, J3, and J4 respetively. 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.


 Electrical Interface
 --------------------
 The interface to the MiniScribe 3650 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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                      F   E   A   T   U   R   E  S
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MINISC.  3650  PRODUCT MANUAL 1076 REV. A, APRIL 7, 1987


 Introduction
 ------------
 The MiniScribe 3650 is a half-height reandom 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 3650 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)
 -----------------------------------
       +----------------------------------+--------+
       |                                  | 3650   |
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |  15    |
       +----------------------------------+--------+
       |Average                msec. typ. |  61    |
       |                       msec. max. | 132    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.33 |
       +----------------------------------+--------+


 Media Defect Criteria (as shipped from MiniScribe)
 --------------------------------------------------
 Model 3650   10 defects surface/maximum
              30 defects maximum per drive
              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.

 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


 Formatting Guidelines
 ---------------------
 Before a hard disk drive can be used, 3 steps must be completed:

 1. The drive must be low-level formatted to establish communications
    with the disk drive and controller board.

 2. The drive must be partitioned into one or more logical drives. Use
    the fdisk programm from DOS versions 3.3 or higher or partioning
    software like Disk Manager or Speedstor.

 3. The drive must be high-level formatted to prepare it for the
    operating system installation. Use the DOS format command or Disk
    Manager/Speedstor software.


 XT 8086/8088 Installation
 -------------------------
 Use the utilities from any 8 bit controller board to low-lwvel format
 the drive. Typical routinetis to use the DOS debug command to address
 these utilities. If the low-level format program of the controller
 asks for step pulse rate or control byte values, use the controller
 default values.


 AT 80286/80386 Installation
 ---------------------------
 Use the MiniScribe version of Ontrack Disk Manager software or the
 Universal version of Speedstor software of the entire formatting
 process.