
D 3 7 6 5    NEC
                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders    1486|  743|     |
Capacity form/unform   177/  236 MB        Heads           4|    8|     |
Seek time   / track  16.5/ 6.0 ms          Sector/track   58|   58|     |
Controller           IDE / AT              Precompensation
Cache/Buffer            32 KB LOOK-AHEAD   Landing Zone
Data transfer rate    2.365 MB/S int       Bytes/Sector      512
                            MB/S ext
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |
       standby        1.3 W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         5       |     55
       seek               W     Rotation   RPM      3600
       read/write     4.8 W     Acoustic   dBA
       spin-up       10.0 W     ECC        Bit
                                MTBF         h      50000
                                Warranty Month
Lift/Lock/Park     YES          Certificates


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                        L   A   Y   O   U   T
**********************************************************************
NEC      D3765  PRODUCT DESCRIPTION 806-521496-0

  +---------------------------------------------------------+
  |                                    +--+JP11             |XX
  |                                    +--+JP12             |
  |                                    +--+JP13             |XX
  |                                    +--+                 |XX
  |                                                         |XX J1
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                            +--+JP16                     |XX
  |  +--+JP3                   +--+JP15                     |XX
  |  +--+JP2                   +--+JP14                     |
  |  +--+JP1                   +--+                         |XX Power
  |  +--+                                                   |XX J3
  +---------------------------------------------------------+



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
NEC      D3765  PRODUCT DESCRIPTION 806-521496-0

 Jumper setting
 --------------

 x = Jumpers are set at factory

 The drive has jumper plugs indicated by marking of JP11, JP12 and
 JP13. These jumper plug are provided with various optional settings
 as shown below.


 JP11  Error Correction
 ----------------------
       +----------------------------------------+--------+
       |Function                                |  JP11  |
       +----------------------------------------+--------+
     x |11-bit burst error is corrected.        | CLOSED |
       |ECC transfer is performed in 7 bytes by |        |
       |the Read/Write Long command.            |        |
       +----------------------------------------+--------+
       |5-bit burst error is corrected.         | OPEN   |
       |ECC transfer is performed in 4 bytes by |        |
       |the Read/Write Long command.            |        |
       +----------------------------------------+--------+
 By allowing retry on execution of the Read Sector(s) command in the
 drive, recoverable read error is automatically corrected with the
 retry function of the drive itself.


 JP12/JP13  Master/Slave mode
 ----------------------------
       +----------------------------------------+--------+--------+
       |Function                                |  JP12  |  JP13  |
       +----------------------------------------+--------+--------+
     x |Set one drive connection mode           | CLOSED | CLOSED |
       +----------------------------------------+--------+--------+
       |No setting is allowed                   | CLOSED | OPEN   |
       +----------------------------------------+--------+--------+
       |Set to two drives connection master mode| OPEN   | CLOSED |
       +----------------------------------------+--------+--------+
       |Set to two drives connection slave mode | OPEN   | OPEN   |
       +----------------------------------------+--------+--------+



 Other Jumper Plugs
 ------------------
 Other jumper plugs are used for the factory inspection. Do not change
 the following setting.
     +-----+------+------+------+-------+-------+
     |JP1  | JP2  | JP3  | JP14 | JP15  |JP16   |
     +-----+------+------+------+-------+-------+
     |OPEN | OPEN | OPEN | OPEN | CLOSED|CLOSED |
     +-----+------+------+------+-------+-------+


 J1  PC/AT Connector Signal Names and Pin Assignment
 ---------------------------------------------------
     +2-4-6-8-10- --40-+
     |                 |
     +1-3-5-7-9-- -----+
     +------------+---------+----------+------------+
     |Signal Name | Pin No. | Pin No.  |Signal Name |
     +------------+---------+----------+------------+
     | -RESET     |   01    |   02     |  GROUND    |
     +------------+---------+----------+------------+
     |  DD7       |   03    |   04     |  DD8       |
     +------------+---------+----------+------------+
     |  DD6       |   05    |   06     |  DD9       |
     +------------+---------+----------+------------+
     |  DD5       |   07    |   08     |  DD10      |
     +------------+---------+----------+------------+
     |  DD4       |   09    |   10     |  DD11      |
     +------------+---------+----------+------------+
     |  DD3       |   11    |   12     |  DD12      |
     +------------+---------+----------+------------+
     |  DD2       |   13    |   14     |  DD13      |
     +------------+---------+----------+------------+
     |  DD1       |   15    |   16     |  DD14      |
     +------------+---------+----------+------------+
     |  DD0       |   17    |   18     |  DD15      |
     +------------+---------+----------+------------+
     |  GROUND    |   19    |   20     |  KEYPIN    |
     +------------+---------+----------+------------+
     |  RESERVED  |   21    |   22     |  GROUND    |
     +------------+---------+----------+------------+
     |  DIOW-     |   23    |   24     |  GROUND    |
     +------------+---------+----------+------------+
     |  DIOR-     |   25    |   26     |  GROUND    |
     +------------+---------+----------+------------+
     |  IORDY     |   27    |   28     |  ALE       |
     +------------+---------+----------+------------+
     |  RESERVED  |   29    |   30     |  GROUND    |
     +------------+---------+----------+------------+
     |  INTRQ     |   31    |   32     |  IOCS16-   |
     +------------+---------+----------+------------+
     |  DA1       |   33    |   34     |  PDIAG-    |
     +------------+---------+----------+------------+
     |  DA0       |   35    |   36     |  DA2       |
     +------------+---------+----------+------------+
     |  CS1FX     |   37    |   38     |  CS3FX-    |
     +------------+---------+----------+------------+
     |  DASP-     |   39    |   40     |  GROUND    |
     +------------+---------+----------+------------+
 A 40-pin right angle connector is used as the interface connector and
 pin No.20 is cut off for prevention of erroneous connector insertion.


 J3  Power Connector
 -------------------
     +---------+
     | 1 2 3 4 |
     +-+-+-+-+-+
       | | | +-------  + 5 VDC
       | | +---------  + 5 VDC Return
       | +-----------  +12 VDC Return
       +-------------  +12 VDC


 J8  External LED
 ----------------
          +------+            1 : LED anode side
          | 1  2 |            2 : LED cathode side
      ----+------+---- PCB



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
NEC      D3765  PRODUCT DESCRIPTION 806-521496-0

 Notes on installation
 =====================

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

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

 The D3756 can be installed either horizontally or vertically. In
 horizontal installation, mount the drive to maintain a posture that
 its printed-circuit board will be situated below (The drive cannot be
 mounted with the interface connector J1 and the power connector J3
 positioned above or below).

 The drive has 10 mounting screw holes. Use these screw holes to fix
 both frams for installation. It requires an interface cable and
 power supply cable to operate the drive. Further, this drive has
 various optional functions including master/slave configuration.


 Frame
 -----
 The D3765 has a frame with 10 mounting screws holes. This frame is
 insulated from the disk enclosure assembly with a shock absorber
 for absorbing vibration and shock. On system installation, allow a
 clearance of at least 2.54 mm around the drive to prevent the disk
 enclosure assembly from contacting with the system frame.

 Connector J1
 ------------
 Connector J1 for the interface is a 40-pin box type and right angle
 connector. Use the interface cable within the limit of 46 cm length.
 Sample:  Adapted connector on the J1 cable side:
          DUPONT 66900-240 or equivalent (Integrated housing and pin)

 Connector J3
 ------------
 The power supply connector J3 is AMP P/N 350211-1 or equivalent.
 The AMP P/N 1-480424-0 is applicable to a connector housing on the
 cable side. For the power cable, take current consumption of the
 drive and cable length into consideration. Use a connector pin suit-
 able for the wiring.

 Connector J8
 ------------
 The drive is provided with a signal connector used to illuminate LED
 to indicate that the drive is busy in exchanging data/command to and
 from PC/AT host system. The signal connector is ELCO 00 8283 0211
 00000 or equivalent.
 The ELCO 60 8283 3028 45000 or equivalent is applicable to a housing
 on the cable side and ELCO 60 8283 0513 99 808 is a receptacle
 contact.


 Jumper Plug Type
 ----------------
 If the jumper plug setting is to be changed for the setting when it
 is shipped from the factory, it can be done by unplugging the jumper
 plug for the next setting change. If the jumper plug is required for
 some reason or other, please use the following jumper plug:
                    Recommended Plug:  DUPONT
                    LU-JUMP socket
                    68905-001



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
NEC      D3765  PRODUCT DESCRIPTION 806-521496-0

 General Outline and Features
 ----------------------------
 The D3765 Magnetic Disk Drive is a storage device using 3.75"
 magnetic disk platter and thin film magnetic head with unformatted
 storage capacity of 235.8 MB, and adopts the PC/AT interface.

 The rotary voice coil motor used in the magnetic head drive mechanism
 brings about read and write operations with high-speed seek and high-
 reliability, and its write system adopts the 1-7 RLL module method.

 Features
 With the Winchester technology employed, the magnetic disk platter
 and magnetic heads are housed in the enclosure made of aluminium
 alloy, which protects them from outside dust for higher reliability.

 The sector servo mode system is used, in which servo signals are
 obtained from the data recording surface for positioning the
 magnetic head, and the rotary type voice coil motor in use has
 allowed a high-speed seek in 16.5 milliseconds of average seek time.

 The CSS (Contact Start Stop) area provided on the innermost cylinder
 of the magnetic disk platters, together with auto retract function
 and auto carriage lock mechanismem, assure a high reliability against
 vibration and shock during transportation.

 The built-in PC/AT interface is a standard interface for personal
 computers and facilitates system configuration.

 The Read Look Ahead Cache function by the track buffer is supported.

 By using the magnetic disk drive with read/write capability of 2.365
 MB per second in 1:1 interleave, the system operation speed is
 enhanced.

 Having the master/slave function, two drives can be connected in
 daisy-chain using the same interface cable.

 By supporting the General Translation function, the optional disk
 parameter within disk storage capacity can be used.


 Disk Enclosure Assembly
 -----------------------
 The disk enclosure (DE) comprises magnetic disk platters, magnetic
 heads, head carriage mechanism, rotary voice coil motor and air
 filter. The spindle motor to rotate the magnetic disk platters
 consists in a inside-hup type DC brushless motor.

 Printed-Circuit Board Assembly
 ------------------------------
 PC/AT interface circuit, buffer RAM, DMA controller, read/write
 control circuit, servo control circuit and spindle motor drive
 circuit are installed for control on the overall operation of the
 drive and interface. Further, Busy LED to indicate the drive opera-
 tion state and the convenient LED connector for setting Busy LED
0outside is installed.


 Interface Circuit
 -----------------
 Use by input and output conditions as shown below.

        Input  Signal Low =  0.0 VDC to 0.8 VDC
               Signal High = 2.2 VDC to service voltage of 5 V.

        Output Signal Low =  0.0 VDC to 0.4 VDC
                             (0.5 V @ 12mA Sink)
               Signal High = 2.5 VDC to 5.25 VDC or Open Circuit

 Reliability
 -----------
 MTBF                       50,000 POH
 MTTR                       Within 30 minutes
 Periodical maintenance     Not necassary
 Service life               5 years or 20,000 POH whichever reaches
                            first. Up to 10,000 cycle for Contact
                            Start Stop.


