M R 5 2 1    MITSUBISHI

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                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders    1224|     |     |
Capacity form/unform    10/   13 MB        Heads           2|     |     |
Seek time   / track  85.0/18.0 ms          Sector/track   20|     |     |
Controller           MFM / ST412           Precompensation   256
Cache/Buffer               KB              Landing Zone      665
Data transfer rate    0.625 MB/S int       Bytes/Sector      256
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 50    |    -40 70
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby       15.0 W     Altitude    km            2.000|        12.000
       idle               W     Shock        g         2       |     30
       seek               W     Rotation   RPM      3465
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   -
                                MTBF         h      20000
                                Warranty Month
Lift/Lock/Park     NO           Certificates                                  

**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
MITSUBI. MR521/MR522  SPECIFICATIONS S06-G30047C 8/4/1984

  +---------------------------------------------------------+
  |                                                         |XX J6
  |                                                         |XX Power
  |                                                         |
  |                                                    +--6 |xx
  |   PCB EDGE                                     SW2 |  | |XX J1
  |   COMPONENT SIDE                                   |  | |XX
  |                                                    +--1 |XX
  |                                                    +--6 |XX
  |                                                SW1 |  | |XX
  |                                                    |  | |XX
  |                                                    +--1 |
  |                                                         |
  |                                                         |xx
  |                                                         |XX J2
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  +---------------------------------------------------------+



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
MITSUBI. MR521/MR522  SPECIFICATION S06-G30047C, 8/4/1984

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

                                                                 |
                                                                 |
                                                                 |
  |                                                              |
  |                         +-SW1--++SW2---+                     |
  |                         |      ||      |                     |
  |                         1------61------6                     |
  |                                                              |
  +-+          ++ +--------+                    ++ +--+   J6     |
    |    J2    || |        |          J1        || |  | XXXXXXX  |
    +----------++-+        +--------------------++-+  +----------+


                         SW1            SW2
                    1-+-+-+-+-+-6   1-+-+-+-+-+-6    ON
                    | | | | | | |   | | | | | | |
                    +-+-+-+-+-+-+   +-+-+-+-+-+-+    OFF
  RADIAL (R) --------+ | | | | |     | | | | | +- TERMINATION SWITCH
  DIAGNOSTIC (D) ------+ | | | |     | | | | +--- NOT USED
  DRIVE SELECT 4 (DS4) --+ | | |     | | | +----- TERMINATION SWITCH
  DRIVE SELECT 3 (DS3) ----+ | |     | | +------- TERMINATION SWITCH
  DRIVE SELECT 2 (DS2) ------+ |     | +--------- TERMINATION SWITCH
  DRIVE SELECT 1 (DS1) --------+     +----------- TERMINATION SWITCH


 Customer-Option Switches
 ------------------------
 There are two switches on the main circuit board of this drive. The
 drive address can be specified and the customer-option functions are
 selected with these switches.


 Drive Select
 ------------
 In multiple unit connection it is necessary to configure each drive
 with a unique address. To select the desired drive number in a
 daisy-chain operation.

   +-----------+---------------------------+       -------+
   |   SW1     |Drive Select Configuration |        +-++-+|ON
   +----+------+------+-----+----+---------+        |x||x||
   |Bit |*Mark |   1  |  2  |  3 |  4      |     OFF+-++-+|
   +----+------+------+-----+----+---------+   -----------+----
   | 6  | DS1  |   ON | OFF |OFF |OFF      |
   +----+------+------+-----+----+---------+
   | 5  | DS2  |   OFF| ON  |OFF |OFF      |
   +----+------+------+-----+----+---------+
   | 4  | DS3  |   OFF| OFF |ON  |OFF      |
   +----+------+------+-----+----+---------+
   | 3  | DS4  |   OFF| OFF |OFF |ON       |
   +----+------+------+-----+----+---------+
  *Mark is printed on Printed Circuit Board (PCB).


 Radial Option
 -------------
 On leaving the factory, the switch marked "R" of SW1 is set in the
 ON position -- lever up and the transfer of control signals to and
 from the drive is enabled only when the address of DRIVE SELECT 1, 2,
 3, or 4 matches the drive address (daisy-chain operation).

 When the switch is in the OFF position -- lever down, the transfer of
 control signals is enabled regardless of the DRIVE SELECT signal
 (radial operation).

 When the "R" option is used, the "Drive Selected" indicator lamp on
 the front of the drive does not light. To make this lamp light, a
 DRIVE SELECT signal shall be applied.


 Diagnostic Option
 -----------------
 Before turning on the power set the switch marked "D" on switch
 assembly SW1 to on. This action will select the diagnostic option.

 After the power is applied and spindle spins at the specified
 rotating speed, the drive will start a diagnostic seek operation.

 And then the switch (SW1-D) is set off position, the head will auto-
 matically position itself in the shipping zone for shipment. The
 switch should be maintained in an "off" position for normal drive
 operation.


 Terminators
 -----------
 To provide termination for the last unit, all switches of SW2 should
 be set in ON position -- lever up. On all other units, all switches
 of SW2 should be set in OFF position -- lever down.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
MITSUBI. MR521/MR522  SPECIFICATIONS S06-G30047C, 8/4/1984

 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!


 The installation directions are as follows:

   Vertical:   on either side
   Horizontal: PCB down

 When installing the drive in its final location, particular attention
 must be paid to the following points.

 1. Ventilation, adequate ventilation must be provided to allow any
    heat generated to dissipate.

 2. Serviceability

 3. The drive must be so installed so as to put no under strain on the
    units frame.

 Vertical Screw Penetration 2.5 mm Max
 Horizonatl Screw Penetration 6.0 mm Max


 J1/P1 Connector - Control Signals
 ---------------------------------
 Connection to J1 is via a 34 pin PCB edge connector. The pins are
 numbered 1 through 34 with the even pins located on the component
 side of the circuit board and the odd numbers on the soldered side. A
 key slot is provided between pins 4 and 6.

 Flat ribbon or twisted pair - maximum length 20 ft, line impedance
 100   10 ohms.

 Mating Connector: 3M ribbon connector P/N 3463-0001 or equivalent


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

 Flat ribbon or twisted pair - maximum length 20 ft, line impedance
 100   10 ohms.

 Mating Connector: 3M ribbon connector P/N 3461-0001 or equivalent


 J6/P6 Connector - DC Power
 --------------------------
 The DC power connector J6 is a 4 pin AMP MATE-N-LOK connector P/N
 350211-1 or equivalent, mounted on PCB.

 Mating Connector and pins:  AMP P/N 1-480424-0 (housing)
                             AMP P/N 614D3-1 (pin connector)


 Frame Ground Connector
 ----------------------
 With this drive, the DC ground for the PCB and the frame-ground for
 the base are connected. The frame-ground connector for this drive is
 a P/N 61761-2 AMP Faston terminal.

 Mating connector: AMP P/N 62187-1


 Multiple Unit Connection (Case of 4 Drives)
 -------------------------------------------
       HOST
   +-----------+                                +-----------------+
   |           +---o---Control------------------+J1     Drive 1   |
   |           |   |    +-------Data------------+J2               |
   |           |   |    |     +---------Power---+J6  FG    ...    |
   |           |   |    |     |                 +-----+-----------+
   |           |   |    |     |            +-Frame-GND+
   |           |   |    |     |            |    +-----------------+
   |Controller |   o----+-----+--Control---+----+J1     Drive 2   |
   |           |   |    | +---+------------+----+J2               |
   |           |   |    | |   |  +-Power---+----+J6  FG    ...    |
   |           |   |    | |   |  |         |    +----+------------+
   |           |   |    | |   |  |         o---------+
   +-----------+   |    | |   |  |         |    +-----------------+
   +-----------+   o----+-+---+--+-Control-+----+J1     Drive 3   |
   |           |   |    | | +-+--+---------+----+J2               |
   |           +---+----+ | | |  |  +-Power+----+J6  FG    ...    |
   |           +---+-Data-+ | |  |  |      |    +-----+-----------+
   |           |   |        | |  |  |      o----------+
   |Data       +---+-Data---+ |  |  |      |    +-----------------+
   |Separator  |   +--Control-+--+--+------+----+J1     Drive 4   |
   |           +-Data---------+--+--+------+----+J2               |
   |           |              |  |  | +-Pow+er--+J6  FG    XXX    |
   +-----------+              |  |  | |    |    +-----+-----------+
                              |  |  | |    o----------+
                  DC       + -+  |  | |    |
                  voltages-+ ----+  | |    |
                  (RADIAL)-+ -------+ |    |
                           + ---------+    |
                  Frame GND  --------------+

 ... = Terminator switches OFF

 XXX = Terminator switches ON



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
MITSUBI. MR521/MR522  SPECIFICATIONS S06-G30047C, 8/4/1984

 Features
 --------
 This highly-reliable miniature disk drive contains a 5-1/4" fixed
 disk and has been designed and manufactured to the same external
 dimensions as a 5-1/4" half height mini flexible disk drive. The
 MR52x series provides large capacity and high speed, up to 25.5
 MBytes and an access time of 85 ms, in a small compact drive. The
 series employs many aspects of "Winchester" technology such as disk,
 head, shield enc., and clean air circulation system. To achieve
 accurate servo system controlled by a microprocessor is utilized, the
 processor also being used for other task to ensure a more reliable
 drive.


 Seek Time
 ---------
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |  18    |
       +----------------------------------+--------+
       |Average                msec. typ. |  85    |
       |                       msec. max. | 199    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.48 |
       +----------------------------------+--------+


 Air filtration
 --------------
 Superior resistance to dust.
 Elimination rate of better than 99.97% for dust particles of greater
 than 0.3  m diameter. Effects of changes in altitude, atmospheric
 pressure, and temperature eliminated through use of special
 replaceable breath filter. Unnecessary to replace main filter.


 Positioning method
 ------------------
 Swing-arm system using high-performance stepping motor and band
 actuator in combination gives high accuracy positioning by embedded
 servo mechanism.


 Heat Dissipation
 ----------------
 15W for MR521, 18W for MR522


 Record media failure (tracks containing nonrecoverable errors)
 --------------------------------------------------------------
 Errors of more than 1 bit length: 10 tracks or less per one data
 head are indicated on a label affixed to the drive prior to shipment
 from the factory: alternate track processing is necessary for these
 tracks.


 Power Interface
 ---------------
 This drive requires an external DC power supply. Pin designations for
 the DC-power connector J6/P6 and the power requirements are shown in
 the following table.
 +---------+-----------+-----------------+-----------------+
 |J6/P6 Pin|DC power   |Power conditions |Ripple conditions|
 |Number   |           |                 |                 |
 +---------+-----------+-----------------+-----------------+
 |  1      |+12V   0.6V|1.0 A Typ (MR521)|100 mVp-p Max    |
 |         |           |1.2 A Typ (MR522)|                 |
 |         |           |3.0 A Starting   |                 |
 +---------+-----------+-----------------+-----------------+
 |  2      |+12V Return|                 |                 |
 +---------+-----------+-----------------+-----------------+
 |  3      |+5V Return |                 |                 |
 +---------+-----------+-----------------+-----------------+
 |  4      |+5V   0.25V|0.7 A Typ        |50 mVp-p Max     |
 |         |           |1.5 A Max        |                 |
 +---------+-----------+-----------------+-----------------+
 Spike noise: 4% or less


 Power-on time
 -------------
 The power should reach 90% of its final value within one second. When
 the power reaches the 90% level, an unsaf condition is cleared
 automatically.


 Power cut-offs
 --------------
 The recorded data is protected even in the event of an abnormal DC
 power condition, except when a write operation is being executed.


 Power on/off sequence
 ---------------------
 Joint power use with the host system is recommended for the +5V
 power supply.

 When separate power supply is used, the host system power should be
 turned on first, and then that of the drive(s). When turning off the
 power, the drive power should be turned off first, and then that of
 the host system.

 Whenever a separate +12V power supply is used, no particular power
 sequence need.


 Shipping Zone
 -------------
 In order to prevent damage to the head and disk caused by vibration
 and shock during shipment, an shipping zone is provided for head
 storage. The shpping zone is located on the inner most track at
 cylinder 665.

 The head can be located in this zone by either of the following
 methods:

 1. When the drive is in the ready state, the head can be moved to
    cylinder 665 by seek operation.

 2. After the switch (SW1-D) is set in the on position, turning on the
    power of the drive, the drive will start a seek operation.

    N.B. Return switch SW1-D to the off position to ensure normal
    operation.

    In diagnostic operation switch off after diagnostic seek opera-
    tion, then the head will be automatically moved to cylinder 665.


 Write Precompensation
 ---------------------
 When a particular data pattern is written, bit shifting due to the
 superposition of the magnetization patterns of adjacent bits can
 occur, causing errors. Precompensation is used to prevent this. With
 this precompensation, when data is written, the write timing is
 switched beforehand to the opposite direction of the data-shift
 direction. The duration of the timing switch for nominal bit
 positions is -12ns (early) or +12ns (late).

 In order to provide for a satisfactorily lower error rate for the
 drive, the host-system timing for MFM write data may not be pre-
 compensated at all tracks or pre-compensated at track numbers greater
 than 256.