
M 2 3 2 1 K    FUJITSU
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 8"/FH                 Cylinders     823|     |     |
Capacity form/unform      /   84 MB        Heads           5|     |     |
Seek time   / track  20.0/ 5.0 ms          Sector/track     |     |     |
Controller           SMD                   Precompensation
Cache/Buffer               KB              Landing Zone
Data transfer rate    1.229 MB/S int       Bytes/Sector      256
                            MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/24 V       Temperature *C         5 40    |    -40 60
Power: sleep              W     Humidity     %        20 80    |      5 95
       standby            W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         2       |     15
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      10000
                                Warranty Month
Lift/Lock/Park     -            Certificates                                  

**********************************************************************
                        L   A   Y   O   U   T
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FUJITSU  M2321/M2322  OEM MANUAL B03P-4740-0101A...02, JAN. 1984

                                         STTG1++STS4
  +-------------------------------------------++------------+
  |                                   STTG2--***** *RDY     |XX
  |                                         STS2+| *FPT     |XX B
  |                                          STS1+ *SPGD    |XX
  |                                                         |XX 26P
  |                           Top View            7--+SW1   |XX
  |                                               |  |      |XX
  |                                           ON  1--+ OFF  |
  |                                                         |XX 60P
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX A
  |                                                         |XX
  |   SW2                                                   |XX
  | ON 7--+ 7--SW3 OFF                                      |XX
  |    |  | |  |                                            |XX
  |    1--+ 1--+                                            |XX
  +---------------------------------------------------------+






 Dual Channel PCB Assembly Connector Location (Option)
 -----------------------------------------------------

   Power Supply (14P)     (14P)                        (26P)
      ^ CN33    CZFM.S3  CZFM.S5                     CZFM.CN2
      |           ^       ^                            ^
 +----------------+-------+----------------------------+--------+
 |  ++++-++CN25   |       |                       +---------+   |
 |  +++++++    +-----+  +-----+                   +--CN24---+   |
 |             +-S2--+  +-S4--+ CZFM.S2(14P)       CZFM.S4(14P) |
 |                                 ^                  ^         |
 |                                 |                  |         |
 |                             +------+            +-S3--+      |
 |                             +-S1---+  CN28      +-----+      |
 |                                       xxxxxx    +CN29-+      |
 |                                       xxxxxx    +-----+      |
 |                                       CN27                   |
 |                       TRM1                           TRM2    |
 |                       ***                            ***     |
 |                       321                            321     |
 |                                                              |
 |                                                              |
 |                                                              |
 |                                                              |
 |                                                              |
 |                                                              |
 |                                                              |
 |      TRM3                                   +-------------+  |
 |      ***                                    +--CN23-------+  |
 |      123                                      Ach-B cable    |
 |  +-TRM-+   +-TRM-+  +--TRM+ +--TRM+   *CHBRSV LED*CHARSV LED |
 |  +-----+   +-----+  +-----+ +-----+   *CHBSLD LED*CHBSLD LED |
 |                                    +--++--++--+              |
 |   +------------------------------+ |  ||  ||  | +----------+ |
 |   |        CN21                  | +-+++-+++-++ |  CN22    | |
 +---+------------------------------+--P-P-D-N-D-N-+----------+-+
                 ^                     L L I O I O      ^
              Bch-A cable              T T S R S R  Bch-B cable
       Insert Ach-A cable to           M M   M   M
       CZFM.CN1                       ON OFF   +++
                                           +++  Channel A
                                            Channel B



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
FUJITSU  M2321/M2322  OEM MANUAL  B03P-4740-0101A...02, JAN. 1984

 Jumper Settings
 ===============

 Model Select Settings
 ---------------------
 When the M232X Micro Disk Drive is installed in the system, the
 Customer must set switch 1 through 3 according to system
 requirements; these switches determine, Disk Logical Unit Number,
 Sector Mode, Tag 4/5 Enable, File Protect and Sector Counting, Switch
 1 through Switch 3 is located on the CZFM PCB Assembly.


 SW1  Disk Addressing
 --------------------
 Disk Logical Unit Number 0 to 7 is selected by SW1 at location E3 on
 the CZFM PCB assembly. Set the desired disk address with the three
 keys on SW1 using the binary code as shown in the following table.

       +------------+------+-------+--------+           xx+  |
       |            |Key 1 | Key 2 |  Key 3 |    03+----xx+  |Key 3
       |Disk Address| 2(1) | 2(2)  |  2(3)  |   |  +----xx+  |
       +------------+------+-------+--------+   |02+----xx+  |Key 2
       |      0     | OFF  | OFF   |  OFF   |   |  +----xx+  |
       |      1     | ON   | OFF   |  OFF   |   |01+----xx+  |Key 1
       |      2     | OFF  | ON    |  OFF   | ON+---SW1------OFF
       |      3     | ON   | ON    |  OFF   |    E3 (CZFM)
       |      4     | OFF  | OFF   |  ON    |
       |      5     | ON   | OFF   |  ON    |
       |      6     | OFF  | ON    |  ON    |
       |      7     | ON   | ON    |  ON    |
       +------------+------+-------+--------+


 SW1  Device Type (optional)
 ---------------------------
 The device tyoe, M2321 or M2322, can be selected by setting Key 4 on
 SW1.

 NOTE
 Tag 4/5 feature must be enabled to obtain device type status.
  +-----------+-----+
  |Device Type|Key 4|    | +------+ |
  +-----------+-----+    |4+----xx+ |Key 4
  |   M2321   |OFF  |    | +----xx+ |
  |   M2322   |ON   |      +------+ |
  +-----------+-----+   ON   SW1    |OFF


 SW1  Tag 4/5 Enable
 -------------------
 The M232XK provides optional Tag 4 and Tag 5 functions. The customer
 may disable or enable these optional functions using Key 5 on SW1 at
 location E3 on the CZFM PCB assembly.

 Disabling the Tag 4 and Tag 5 functions inhibits the receivers of Tag
 4 and Tag 5 receivers on the interface.
       +-------+------+
       |Tag 4/5| Key 5|  These signals gate additional information on
       +-------+------+  Status 0 to 5 lines of the A cable. When Tag
       |Disable| OFF  |  4 and 5 are disabled, Status 0 to 5 lines
       |Enable | ON   |  indicate Unit Status only.
       +-------+------+


 SW1  Sector Mode
 ----------------
 The customer can select Hard Sector mode (1 to 128 sectors) or
 Variable Soft Sector mode, using Key 6 on SW1 at location E3 on the
 CZFM PCB assembly.

 +--------------------+-----+ In the case of Hard Sector, the customer
 |Sector Mode         |Key 6| must set the number of sectors per disk
 +--------------------+-----+ revolution. Setting the number of
 |Hard Sector         |OFF  | sectors per revolution is also available
 |Variable Soft Sector|ON   | in the Variable Soft Sector mode.
 +--------------------+-----+


 SW1  File Protect
 -----------------
 When the customer desires to inhibit the write operation, the File
 Protect key may be set to the ON position, using Key 7 on SW1.
  +---------------+------+
  |File Protect   | Key 7| File Protected signal, enabled by a switch
  +---------------+------+ on the PCB assembly, indicates all tracks
  |Enable writing | OFF  | are in write-protected status. Attempting
  |Disable writing| ON   | to write while this signal is on will cause
  +---------------+------+ a fault.


 SW2/SW3  Sector Counting
 ------------------------
 Sector count configuration switches SW2 and SW3 are located at A26
 and A24 respectively on the CZFM PCB assembly. Each key of SW2 and
 SW3 represents the binary powers of the Byte Clock.
       +-----------+--------+-----------+-------+
       |SW2 Key No.| Value  |SW3 Key No.| Value |
       +-----------+--------+-----------+-------+
       |    1      |  1     |   1       |  128  |
       |    2      |  2     |   2       |  256  |
       |    3      |  4     |   3       |  512  |
       |    4      |  8     |   4       | 1024  |
       |    5      | 16     |   5       | 2048  |
       |    6      | 32     |   6       | 4096  |
       |    7      | 64     |   7       | 8192  |
       +-----------+--------+-----------+-------+
 SW2 and SW3 keys must be set according to the number of bytes per
 sector. Knowing that the number of bytes possible on a track equals
 20,480, any sectoring requirement from 1 to 128 sectors per track can
 be configured using the following formulas:

 1. Calculation based on Sectors/Track

    Examble 9 Sectors/Track

    1.         20,480                         20,480
         ----------------- = Number of Bytes  ------ = 2,275.555
         Number of sectors   per sector         9

    2. If the above calculation results in a remainder, truncate the
       remainder and add one to the integer portion of "number of
       bytes per sector"   2,275 + 1 = 2,276

    3. Configure SW2 and SW3 to "number of bytes per sector" less one
       to allow for Sector Counter Reset Clock.   2,276 - 1 = 2,275

         2,275 = 2,048 + 128 + 64 + 32 + 2 + 1

       Keys must be "ON": Key #  5     1     7   6   2   1
                                +-------+   +-------------+
                                   SW3            SW2


    4. To determine how many bytes (if any) the last sector of each
       track will be short, multiply "number of bytes per sector" by
       "number of sectors" and subtract 20,480.

            2,276 * 9 = 20,484
                      - 20,480
                      --------
           Last sector short 4 bytes


 2. Calculation based on Bytes/Sector

    Example: 583 Bytes/Sector

    1. Calculate the Value = 16,384 - (Byte/Sector)
       to be set.            (Particu-
                             lar Value)
                           = 16,384 - 583
                           = 15,801

    2. Select the keys must be OFF positiopn after the following
       calculation.

 15,801 = 8,192 + 4,096 + 2,048 + 1,024 + 256 + 128 + 32 + 16 + 8 + 1
          Keys must be "OFF": 7 6 5 4 2 1  6 5 4 1
                              +-+-+++-+-+  +-+++-+
                                  SW3        SW2

    3. Calculate the Sectors/Track

                       Bytes/Track     20,480
       Sectors/Track = -----------   = -------  = 35.129
                       Bytes/Sector     583

    4. If the above calculation results in a remainder, truncate the
       remainder. The integer postion means actual sectors per track.

            Actual Sectors/Track = 35

    5. Calculate the number of the last sector (remainder).

       Last Sector Length = 20,480 - (Bytes/Sector) * (Sectors/Track)
                          = 20,480 - 583 * 35
                          = 75


 Operator Panel Connection
 -------------------------
 The CZFM PCB allows for connection of an optional control panel. At
 location on this PCB, there is a 14 pin DIP socket for the control
 panel connection.

 Pin Number  Signal Mnemonic    Definition
     1             +5V          +5 Volt
     2             *FPTK        File Protect Switch
     3             *CKCLR       Check Clear Switch
     4             *LRDY        Ready LED
     5             0V           Signal Ground
     6             *LUSLD       Unit Selected LEd
     7             0V           Signal Ground
     8             0V           Signal Ground
     9             *PWRDY       Power Ready LED
    10             *LFPT        File Protect LED
    11             *LDYCK       Device Check LED
    12             0V           Signal Ground
    13             0V           Signal Ground
    14             +5V          +5 Volt

 "*" Indicates a low active signal



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                      I   N   S   T   A   L   L
**********************************************************************
FUJITSU  M2321/M2322  OEM MANUAL B03P-4740-0101A...2, JAN. 1984

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

 General Description
 -------------------
 Two M232X Micro Disk Drive can horizontally mounted in a 9 inch rack
 with optional mounts hardware. The M232X may also be built into a
 system cabinet and mounted horizontally or vertically. An operator
 oanel (with slide rails) is available.

 The CZFM Printed-Circuit Board Assembly in the M232X Micro Disk Drive
 is equipped with Maintenance Aid LED's and File Protect switch.

 Powering up/down and the functions of the internal installed
 indicators (LED) and switches will be described in this section. The
 fnctions of the LED's and switches on the operator panel will also
 be described.


 Powering up/down
 ----------------
 The M232X Micro Disk Drive is not equipped with a power ON/OFF
 switch. Powering up/down of the M232XK's typically performed by a
 powering up/down of the system.

 When the disk unit is equipped with an optional power supply, power-
 ing up/dowm may be performed by turning the power switch ON and OFF
 at the power supply.


 Control and Indicators
 ----------------------
  Operator Panel (option)

  +----------------------------------------------------------------+
  |                                         Power Ready            |
  |           +------------+                 +-+--+-------+        |
  |           |+-++-+   +-+|                 |+-++-+   +-+|        |
  |           |+-++-+   +-+|                 |+-++-+   +-+|        |
  |           |+-++-+   +-+|                 |+-++-+   +-++PTCT    |
  |           |+-++-+      |                 |+-++-+      |        |
  |           +------------+                 +-+--+-------+        |
  |                                       Protect Check            |
  +--Operator-Panel-(Optional)-------------------------------------+

 Power indicator:   Red - This LED lights when the power is turned on.
 Ready indicator:   Red - This LED indicates the initial seek has
                    performed or indicates the termination of a Seek
                    or RTZ operation.
 Check indicator:   Red - This LED indicates any fault condition.
 Protect indicator: Red - This LED indicates that writing is inhibited

 Protect (PTCT) switch: White - This key inhibites the write operation
 Check clear switch:    Gray (flat key) - This key resets a Device
                        Check status.


 CZFM PCB Assembly
 -----------------
 The unit contains fault display indicator (LED's) and File-protect
 switch.

 RDY (Ready) indicator: Green
 This RDY LED indicates that the initial seek has been performed or
 indicates the termination of a Seek or RTZ operation.

 FPT (File Protect) indicator: Orange
 This LED indicates that writing is inhibited.

 SPGD (Speed Good) indicator: Green
 This LED indicates that rotational Speed is within the specified
 speed.

 STS1 to 4, STTG1 and STTG2 (Status and Status Tag): Red
 The two-bit binary coded Status Tag 1 and 2 LED's have the following
 conditions.

   Status  Status      Condition
   Tag 2   Tag 1
     0       0     :   Power-up Sequence
     0     0<-- 1
           0 -->1  :   Power-up Sequence Check
     0     1       :   Fault
     1     0       :   Seek Error
     1     1       :   Normal Status

 The Status Tag 00 has the highest priority and Status Tag 11 has the
 lowest priority.


 Power Supply
 ------------
 The optional power supply may be provided with the M232XK.

 +-------------------------------------------------------------------+
 |    +---+                                            Power ON  *   |
 | AC++   |1                                           Power ALM *   |
 | IN++   |                                            Device ALM*   |
 | PUT|   TRM1    X Fuse                                             |
 |    |   |         (AC output)                             +24Vxx   |
 |  FG|   |3                                                 +5VXX   |
 |    |   |                                                  -0VXX   |
 | ALM+   |   +-+                        FG    SG  TRM2     -12VXX   |
 |   ++   |   +-+         +----x----+          2    3                |
 |    |   |5  MAIN LINE   +---------+   +-------------+Volt Check*   |
 |    +---+   SWITCH 7.5A AC100V  AC220V|             | +5V Volt ADJ |
 |                        AC115V  AC240V+-------------+              |
 +------------------------AC120V-------------------------------------+

                  Front View of Power Supply Unit

 Power Supply Unit
 A power supply unit may either be mounted horizontally behind the
 disk drive or may be mounted vertically.

 Specification: B14L-5105-0100A

 Back View     TRM1: AC power input and alarm sending
 +----CN31+    TRM2: FG-SG coupling terminal (Normally open)
 |xxx XXX |    CN31: Drive unit power feeding connector (for cable
 |CN33    |          B660-0625-T327A (Option))
 |        |    CN32: Fan unit power feeding connector (for cable B660-
 |        |          0625-T328A (Option))
 |        |    CN33: Dual channel PCB unit power feeding connector
 |  CN32Xx|          (for cable B660-0625-T329A (Option))
 +--------+
 AC input voltage selection from 100/115/120V AC to 220/240V AC is
 switched selectable. Also regardless of AC input voltage, AC output
 voltage from CN2 (fan unit power supplying connector) is kept +15% AC
                                                               -24%

 Therefore when using the option power supply only the 115V AC fan is
 required.


 Connection
 ----------
 The interface connection between MDD and the control unit consists of
 two connectors "A" and "B". A cables, which are connected with
 connector "A", may be connected in a daisy-chain configuration. A
 line terminator must be inserted into the "A" connector of the
 last MDD. B cables, which are connected with connector "B", are
 connected in a radial configuration. "A" cables can also be connected
 in a radial configuration.


 Timing Specification
 --------------------
 Timings are specified at the connector position of the MDD unless
 otherwise specified. Accordingly, it is necessary for signal timings
 to consider both the delay time of the interface cables
 (approximately 5ns/m) and the circuits of the disk control unit.


 Daisy-chain Configuration
    +-------------------------------- -------+
    |       Control Unit I                   |
    |A   B0         B1        B2           B7|
    ++---+----------+----------+----- ------++
     |   |          |          |            |
     +---+------+---+------+---+----- --+   |
    +++ +++    +++ +++    +++ +++      +++ +++
    |A| |B|    |A| |B|    |A| |B|      |A| |B|
    +-+-+-+    +-+-+-+    +-+-+-+      +-+-+-+
    |     |    |     |    |     |      |xx   |
    |MDD#0|    |MDD#1|    |MDD#2|      |MDD#7|
    |     |    |     |    |     |      |xxmax|
    +-+-+-+    +-+-+-+    +-+-+-+      +-+-+-+
    |A| |B|    |A| |B|    |A| |B|      |A| |B| +
    +++ +++    +++ +++    +++ +++      +++ +++ |
     +---+------+---+------+---+----- --+   |  |
     |   |          |          |            |  |
    ++---+----------+----------+----- ------++ + Used in Dual Port
    |A   B0        B1         B2           B7| | only
    |       Control Unit II                  | |
    +-------------------------------- -------+ +
 xx = indicates line terminator


 Star-chain Configuration
    +-------------------------------- -------+
    |       Control Unit I                   |
    |A0  B0     A1  B1     A2 B2        A7 B7|
    ++---+------+---+------+---+----- --+---++
     |   |      |   |      |   |        |   |
     |   |      |   |      |   |        |   |
    +++ +++    +++ +++    +++ +++      +++ +++
    |A| |B|    |A| |B|    |A| |B|      |A| |B|
    +-+-+-+    +-+-+-+    +-+-+-+      +-+-+-+
    |xx   |    |xx   |    |xx   |      |xx   |
    |MDD#0|    |MDD#1|    |MDD#2|      |MDD#7|
    |xx   |    |xx   |    |xx   |      |xxmax|
    +-+-+-+    +-+-+-+    +-+-+-+      +-+-+-+
    |A| |B|    |A| |B|    |A| |B|      |A| |B| +
    +++ +++    +++ +++    +++ +++      +++ +++ |
     |   |      |   |      |   |        |   |  |
     |   |      |   |      |   |        |   |  |
    ++---+------+---+------+---+----- --+---++ + Used in Dual Port
    |A0  B0     A1 B1      A2 B2        A7 B7| | only
    |       Control Unit II                  | |
    +-------------------------------- -------+ +
 xx = indicates line terminator


 Signal Transmission Driver/Receiver
 -----------------------------------
 Balanced transmission method in transferring signal within the inter-
 face. This method is suitable for only range transmission and also
 not susceptible to external noise.

  Driver    SN75110 or equivalent
  Receiver  SN75107/SN75108 or equivalent


 NOTE A Cable
 Line terminators R1 and R2 (56    5%, 1/10W) are located on the
 driver side and R3 and R4 (56    5%, 1/10W) are located on the re-
 ceiver side. The line terminators are required on the control unit
 and the terminator assembly of the last disk unit.

 The maximum cable length is 30 meters.


 NOTE B Cable
 The cable shall be flat with characteristic impedance of 130    13 .

 Line terminators R1 and R2 (82    5%, 1/10W) are located on the
 control unit or the input terminal of the disk drive.

 Line protectors R3 and R4 (470    5%, 1/10W) are located on the
 control unit or the imput terminal of the disk drive.

 Time delay of the cable is approximately 5ns/m. Transfer time and
 delay of the Receiver (SN75107) is 19ns nominal for both high and low
 signals.

 To prevent false operation of the receiver, due to interface
 disturbances during a power failure of the unit, the bias resistors
 are used on the controller side for Unit Selected and Seek End
 signals.

 Maximum cable length is 15 meters.

 R5 and R6 (15K    5%, 1/10W) are used to prevent the receiver output
 signal from oscillating when input signals are both high.


 Channel Ready
 -------------
 The Channel Ready signal must be issued to protect data due to inter-
 face disturbances during a power failure of the control unit. It is
 preferrable to use some type of bias circuit, i.e. a relay circuit
 using passive elements, in transmitting this signal.

 If SN75110 is used as a driver, it is desirable to use two of them
 in parallel.

 Whatever type of circuit is used, as far as this signal is concerned,
 the line terminator on the driver side is not needed.


 Connector and Cable
 -------------------
 A Cable Connector (60 pos.)
  Header Specfication  FCN-702P060-AU/M (Wire wrapping)
                       FCN-704P060-AU/M (Straight)
                       FCN-705P060-AU/M (Right Angle)
  Socket Specification FCN-707J060-AU/B (Closed End)
                       FCN-707J060-AU/O (Through End)

 B Cable Connector (26 pos.)
  Header Specification FCN-702P023-AU/M (Wire wrapping)
                       FCN-704P026-AU/M (Straight)
                       FCN-705P026-AU/M (Right Angle)
                       FCN-707J026-AU/B (Closed End)
                       FCN-707J026-AU/O (Through End)

 A Cable
  Specification        455-248-60 Spectra Strip
                       Zo = 100    10
                       28 AWG, 7 strands


 B Cable
  Specification        174-26 Ansley/3476-26 3M
                       Zo = 100    10 /Zo = 130    15
                       28 AWG, 7 strands


 Secure the Unit
 ---------------
 In installing the unit, it is important that an unit does not touch
 any other hard parts such as mounting plate, etc. when operating as
 well as non-operating (both storage and shipping).


 Power Cable Connection
 ----------------------
 This unit use the DC power source only. The following shows the
 connector specification on the unit side, recommended specifications
 on the cable side, and correspondence between pin assignment and
 voltages. The connectors for the power cable consist of two 7P
 connectors, while the cable side also requires two 7P connectors.

 Specification on the unit side
 Header C63L-0820-0008 (2420-07A-G manufactured by MOLEX) (7P) x 2
 units

 Recommended specifications on the cable side
 Housing : MOLEX 2139-7
 (7P) x 2 units

 Contact : MOLEX 2478-GL
 (12 units)

 Key : MOLEX 2560-1
 (2 units)

 Pin assignment and voltages

        (CN10)               (CN9)
    +-+++-+-+-+-+-+    +-+-+-+-+-+++-+
    +-+++-+-+-+-+-+    +-+-+-+-+-+++-+
     1 2 3 4 5 6 7      1 2 3 4 5 6 7

 (CN10)                 (CN9)
  1  0V     (-12V RTN)    1  +5V
  2  (Key)                2  +5V
  3  0V     (-12V RTN)    3  0V     (+24V RTN)
  4  -12V                 4  0V     (+24V RTN)
  5  -12V                 5  +24V
  6  0V     (+5V RTN)     6  (Key)
  7  0V     (+5V RTN)     7  +24V

 NOTE
 Use AWG 18 as the cable material
 The cable length must be less than 1.5m

 Also, if the power supply (option: B14L-5105-0100A) is used, the
 following power cable is provided.

    Specification: B660-0625-T327A
                   B660-1995-T041A (with DC Fan Unit)


 Cable Termination
 -----------------
 In daisy-chain configuration, A-cable signals must be terminated at
 the last disk drive with four module resistors. Four module-resistors
 are attached with all disk drives, therefore four module-resistors
 should be removed on the disk drive which the line termination is not
 necessary. (A, B, C, D)

 -----------------------------------------+
                                        +-+--+
                   56 ohms              |   ++
                  +-----+ --+           |   |CN2
                 9+ -+  |8  |           |   |
                10+ -+- +7  |           |   |
                11+ -+- +6  |           |   ++
                12+ -+- +5  |           +-+--+
                13+ -+- +4  +-----+     +-+--+
                14+ -+- +3  |     |   x |   ++
                15+ -+- +2  |     +- DX |   |
                16+--+- +1  |         x |   |
                  +--*--+ --+        CX |   |
                                      x |   |CN1
                                     BX |   |
                                      x |   |
                                     AX |   ++
    CZFM PCB Assembly                 1 +-+--+
 -----------------------------------------+

 System Grounding
 ----------------
 This drive unit is uniformly grounded in the signal ground (SG). If
 the FG and SG connection is required on the system, use the SG tap
 at the back of the unit.

 Also, the optional fan unit is grounded in the FG. In principle, the
 SG (drive) is separated from the FG (fan unit) with the insulating
 bushing when it is attached to the drive unit.

 Connecting or disconnecting between FG and SG on the power supply
 unit can be performed according to system power distribution and
 system ground requirement.


 Options
 -------
 Component name  Specification    Remarks
                 (Drawing No.)
 Fan unit        B03B-4740-E002A  100/115/120V AC; 50/60 Hz
 Fan unit        B03B-4740-E003A  220/240 V AC; 60 Hz
 Fan unit        B03B-4740-E005A  +24V DC
 Power supply
 unit            B14L-5105-0100A  100/115/120/220/240V AC
                                  With connectors for feeding power to
                                  fan units and dual channel printed
                                  board unit.
 Cable           B660-1065-T006A  Interface cable (A) 60P flat cable
 Cable           B660-1065-T008A  Interface cable (B) 26P flat cable
 Cable           B660-1865-T020A  Interface cable (A) for 2 units
                                  daisy chain
 Cable           B660-1865-T030A  Interface cable (A) for 3 units
                                  daisy chain
 Cable           B660-1865-T040A  Interface cable (A) for 4 units
                                  daisy chain
 Cable           B660-1865-T050A  Interface cable (A) for 5 units
                                  daisy chain
 Cable           B660-1865-T060A  Interface cable (A) for 6 units
                                  daisy chain
 Cable           B660-1865-T070A  Interface cable (A) for 7 units
                                  daisy chain
 Cable           B660-1865-T080A  Interface cable (A) for 8 units
                                  daisy chain
 Panel unit      B03B-4595-E501A  Flat key type control panel board
 Mounting tray   B21L-1810-0001A  For mounting two units of 19 inch
                                  rack with 3 pitches (inside frame)
 Mounting tray   B21L-1810-0002A  For mounting two units of 19 inch
                                  rack with 3 pitches, and the front
                                  panel has the windows for operating
                                  the panel unit.
 Dual channel
 PCB assembly    B03B-4740-E401A  To be mounted on optional PSU.
                 B03B-4740-E402A  To be mounted on drive unit.
 Power cable     B660-0625-T327A  Drive unit - power supply unit
                                  connecting
 Power cable     B660-1995-T041A  Drive unit and DC(+24V) Fan unit -
                                  power supply unit connecting
 Cable           B660-0625-T328A  E002A fan unit - power supply unit
                                  connecting
 Cable           B660-0625-T335A  E003A fan unit connecting
 Cable           B660-1995-T003A  E501A panel unit - drive unit
                                  connecting
 Cable           B660-0625-T329A  Dual channel PCB assy.- Power supply
                                  unit connecting.

 NOTE
 Items in the above table are optional and not fundamental components
 of this unit. These items must be ordered separately conforming to
 the above specifications as occasion demands.


 Fan Unit
 --------
 The M2321/M2322 requires some means of cooling, since there is no
 internal blower motor. For this purpose, optional fan units is
 available. The fan unit is available in the event that adequate
 cooling i snot provided within the mounting cabinet. This fan unit
 is directly mountable onto the hind of the device, and be mounted
 also at the field by using the existing screws and taps.

 The fan unit may be ordered in any of the following voltage ratings:
 100/115/120V AC, 220/240V AC or +24V DC. When the input power of the
 fan unit is supplied from the optional power supply unit, the fan
 unit could be ordered th etype for 100/115/120V AC (B03B-4740-E002A)
 regardless of system AC voltage. Moreover, DC fan unit (B03B-4740-
 E005A) is also useful with the optional power supply unit. In this
 case, power cable must be ordered following specifications:
 B660-1995-T041A.

 Fan Unit Connector Part Number

 Connector : AMP 1-480704-0
 Contact   : AMP 350550-1


 19" Rack Mount Installation
 ---------------------------
 Mounting-tray with brackets is possible to install two drives, side
 by side in a 19" rack, three pitches. It can also accommodate the
 the optional fan units and/or power supply units for each of the two
 drive.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
FUJITSU  M2321/M2322  OEM MANUAL B03P-4740-0101A...02, JAN. 1984

 General Description
 -------------------
 This manual describes the Fujitsu 8-inch rigid disk drives M2321/
 M2322. These units contain non-removable disks in sealed modules. A
 rotary actuator using a closed loop servo performs head positioning.

 These drives have floppy disk drive dimensions and can be mounted
 horizonatally two drives wide in a 19-inch rack (with 3 pitch) or
 mounted vertically in a system cabinet.

 The contact start/stop (CSS) type heads and media are of the
 Winchester technology type. These units feature high performance,
 high reliability and low cost.

 The M2321 and M2322 utilize the industry standard SMD interface,
 thereby allowing the drives to be added to an existing disk
 configuration.

 By standardizing on this interface, development time for controllers
 and software will be substantially reduced. Also fixed and variable
 sector length formats are internally selectable.

 To power the drives only DC voltages of +24, +5 and -12 volts are
 required, allowing for international versatility. Total nominal
 power cinsumption is less than 150 watts.


 19" Rack Mount Installation
 ---------------------------
 Mounting-tray (inner frame) guided by brackets (outer frame) can be
 drawn out forward. (Travel distance is approximately 24").

 NOTE
 Mounting-tray (0001A) cannot accommodate the drive unit with Panel
 unit. In that case, 0002A-type must be specified.


 Error Rate
 ----------
 The following error rates assume that the M2321/M2322 is beeing
 operated within specification. Errors caused by media defects or
 equipment failures are excluded.


 Read Errors
 -----------
 Prior to determination of a read error rate, the data shall have been
 verified as written correctly and all media defects flagged.

 1. Recoverable Error Rate
    A recoverable read error is one which can reading on track, and
    should not exceed ten per 10(11) bits.

 2. Unrecoverable Error Rate
    An unrecoverable read error is one which cannot be read correctly
    within sixteen retries and should not exceed ten per 10(14) bits.


 Positioning Error Rate
 ----------------------
 The positioning error which can be corrected within one retry should
 not exceed ten per 10(8) seeks.


 Media Defects
 -------------
 A media defect is defined as a repeative read error that occurs on
 a properly adjusted drive within specific operating conditions.

 Valid data must not be written over known media defects, therefore,
 sector/track deallocationor skip displacement techniques must be
 utilized.

   1. Media Defect Characteristics
     a. The maximum number of defects per drive is as follows:
         M2321K  (84MB): TBD
         M2322K (168MB): TBD

     b. The maximum number of defective tracks per drive is as
        follows:
         M2321K  (84MB): TBD
         M2322K (168MB): TBD

        A defective track is defined as a track having any of the
        following:
        1. Two or three defects
        2. Defective logging areas

        NOTE
        No track shall have more than three defects.

    2. Media defect free areas are defined as follows:
       1. Cylinder 0, Head 0 through 2

       2. Any error in logging area to extent defined in the Media
          Defect Format.


 Media Defect Information
 ------------------------
 All MDD will have a Media Defect List which will list the following
 information.

 1. Cylinder Address
 2. Head Address
 3. Position (bytes from Index  1 byte)
 4. Length (bits  1 bit)

 The above information will be listed by hexadecimal code. The
 maximum media defect length at a defect is 64 bytes (512 bits).


 Media Defect Format
 -------------------
 The MDDs will be formatted at the factory with standard Media Defect
 Format. The Media Defect Format is divided into two parts. The first
 part is a hard-sectored format and is normally included in the first
 56 bytes following Index signal. The second part is a soft-sectored
 format and is normally included in the next 49 bytes following Index
 signal.


 Disk Platters
 -------------
 The M2321 and M2322 disk drives contain three and four platters,
 respectively. These platters are 200 mm (eight-inch) diameter
 aluminium substrate-coated disks with a lubricated iron oxide
 coating. The bottom side of the lowest disk is pre-written at the
 factory with reference servo patterns. The platter surface can
 sustain 10,000 start/stops without damage.


 Data Heads
 ----------
 The heads are in contact with the media surface when the platters
 are not rotating, and they lift-off with rotation. A landing zone is
 provided out of the data area which is use when the heads contact the
 media. Five heads are used in the M2321 and ten in the M2322.


 Panel Unit
 ----------
 The panel unit includes function lights which indicate power on,
 ready, write protect, check, and also includes a write protect
 switch.

 When the panel unit is used in the Mounting-tray (B21L-1810-0002A),
 the type panel unit B03B-4590-E501A must be ordered.


 Cables
 ------
 The interface cable (A) i sup to 30m long (to the drive unit at the
 final step in case of daisy chain mode). The length of the cable can
 be specified in every 20 inches (508mm).

 The interface cable (B) is up to 15m long. The length of this cable
 can be specified in every 500 mm.


 Air Circulation in DE
 ---------------------
 As the Contact Start/Stop (CSS) head used in this disk unit has a
 very low flying height (approximately 0.35  m), head crashes could
 caused by microscopic foreign particles. To keep the inside of the DE
 clean, this enclosure is completely sealed and clean air is supplied
 through two filters. The breather filter is used for external air
 intake, while the recirculation filter is used to keep the air inside
 the DE clean.


 Printed Circuit Boards
 ----------------------
 Three PCBs are mounted on both the topside and the backside of the
 M2321/M2322 micro disk drives. They are easily removed by unplugging
 the connectors and removing the screws securing the PCBs to the
 chassis. The basic functions performed on the PCBs are as follows:

 a. SMD Interface is enabled/disabled by the controller using the
    drive select function, thus allowing up to eight drives to be
    daisy-chained together.

 b. Drive Status such as On Cylinder, Fault, Seek Complete, Write
    Protect, Index and Ready are made available to the interface.

 c. Read/Write control includes conversion of NRZ interface write
    data to MFM coding. When the drive is instructed to read, the
    head select circuit decodes the selected head and the MFM data is
    converted back to NRZ for transmission to the controller.

 d. Servo Control circuits take the Cylinder Address command from the
    interface and control the seek operation to any desired cylinder.

 e. Spindle Speed control circuits monitor the speed of the spindle/
    drive motor and maintain 3,600 RPM   1%.


 Format Control
 --------------
 The Record Format is controlled by the control unit. The Index and
 Sector signals are used to indicate the beginning of a track and
 sector by the control unit.

 Some disk drive dependent constrains must be recognized to
 accomplish a format. The following is a list of those format
 parameters:

 1. Gap 1 Tolerance
    This tolerance is required for conventional disk pack/cartridge
    drive, in MDD M2321/2322 is not required, however, this tolerance
    must be provided to allow for head selection or read-after-write
    transient.

 2. VFO Fast Synchronization
    The synchronization time required to allow Variable-Frequency-
    Oscillator (VFO) to synchronizes is 11 bytes minimum before
    Synchronous Patterns of address field and data field.

 3. Write Driver Turn On Time
    The Write Driver Turn on time is approximately 800 ns (8 bits).
    This time has to be accounted for in order to know write splice
    locations.

 4. Synchronous Byte
    Synchronous Byte is one-byte field containing non-zero pattern to
    identify the beginning of the address field and data field of
    record. The pattern is 0E (hexadecimal) for address field and 09
    (hexadecimal) for data field.

 5. End-Of-Record (EOR) Pad
    This tolerance is a one-byte of zeros to allow the internal
    encoding delay time during write operation.

 6. Gap 3 Tolerance
    Gap 3 is 4-byte minimum of zeros to prevent the write turn-off
    transient and write/read encoding/decoding delay time.

 7. Head Select Transient
    The control unit must provide a 5 s minimum delay time between a
    head select and initiating a read gate. Normally this delay time
    will be provided by adding zeros within Gap 3 and/or Gap 1
    depending the control unit function.

 8. Read-after-Write Transient
    The control unit must provided a 10 s minimum delay time between
    the trailing-edge of a write gate and the leading-edge of a read
    gate.

    Normally this delay time will be provided by adding zeros within
    Gap 3 and/or Gap 1 depending on the control unit function.

 9. Read/write Encoding/Decoding Time
    The NRZ write data is encoded into MFM write data pulse and
    written on the specified record during write operation. The MFM
    read data pulse is decoded into NRZ read data and then sent to the
    control unit during read operation. Through encoding and decoding
    circuitry, a read data signal will be delayed by approximately
    one-byte against a write data.


