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Hard Drive: NEC: D2257 MB 8,0"/FH SMD




D 2 2 5 7    NEC
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 8"/FH                 Cylinders    1024|     |     |
Capacity form/unform      /  167 MB        Heads           8|     |     |
Seek time   / track  20.0/ 5.0 ms          Sector/track  128|     |     |
Controller           SMD                   Precompensation
Cache/Buffer               KB              Landing Zone
Data transfer rate          MB/S int       Bytes/Sector      512
                      1.198 MB/S ext
Recording method                                    operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/24 V       Temperature *C         5 40    |    -10 60
Power: sleep              W     Humidity     %        20 80    |     10 90
       standby            W     Altitude    km            3.000|        12.000
       idle               W     Shock        g         2       |     15
       seek          99.9 W     Rotation   RPM      3510
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   YES
                                MTBF         h      12000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     UL478                        

Layout

NEC D22X7 SERIES PRODUCT DESCRIPTION 806-220357-0 REV. E 8/1982

   Protect Switch          P57
     +----+   +------------+   LED     +------+P56
     | O--|   |::::::::::::| xx xx xx  |::::::|
   --+----+---+1-----------+-----------+1-----+----
   ON     OFF                 |  |   +---- Ready
                              |  +-------- Fault
                              +----------- Seek Error

                                                       |
   |                                                   |
   |                                                   |
   |---------------------------------------------------+
   |                                   ++------++      |
    |    Top Side View                 ++      ++14A   |
     |                                 1--------+      |
      |------------------------------------------------+

   |---------------------------------------------------+
   |                   0 ++------++-++------++    0    |
    | Bottom Side View   ++ 13M  ++ ++      ++14M      |
     |                 1 8--------1-8--------1    1    |
      |------------------------------------------------+
      |                                                |
      |                                                |

Jumpers

NEC D22X7 SERIES PRODUCT DESCRIPTION 806-220357-0 REV. E 8/1992

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

The disk drive contains three dual-inline-packaged (DIP) switch
assemblies for Selection of Installation Mode, Control Mode, and
Sector number.

These switches are all able to directly accessible by CE personnel
without any disassembling work to the drive Assembly.

 Installation Mode Dip Switch Assy
 ---------------------------------
 1. The switch bit 1 through bit 4 is assigned as the Unit Address
    switches.

    The Unit Address (Device Number) switches are contained in the DIP
    switch located at "14A" position on the Logic & Servo PWA.

    One of sixteen or four Address code (0,1,2 and 15 or 3) is
    selected by the "UNIT NO." switches consisting of four or two
    bits.

 2. Address mode select switch
    When this switch is set to "2 BIT ADDRESS MODE", the Unit Select
    bit 2(0) bit 2(1) of the SMD Interface line are only used for
    unit address compare. (Bit 2(2) and 2(3) are ignored.)

    When this switch is set to "4 BIT ADDRESS MODE", the full Unit
    Select bit 2(0), 2(1) and 2(3) are used for unit Address compare.

 3. Servo Offset Control switch
    When this switch is set to "SERVO OFFSET ENABLE" (=Bit Position
    "0"), the "SERVO OFFSET PLUS (Tag 3 with Bit 2)" or "SERVO OFFSET
    MINUS (Tag 3 with Bit 3)" comman dis accepted by the disk drive
    and causing a offset-seek operation. When the switch is set to
    "SERVO OFFSET DISABLE" (=Bit Position "1"), the disk drive does
    not accept any Servo Offset Command.

DIP Switch 14A
--------------

  1 +---------------+
    |x x x x x x x x|
  0 +1-2-3-4-5-6-7-8+
           +---------+-------------------+
           |         |    Dip Switch     |
           |         | 1  | 2  | 3  | 4  |
           +---------+----+----+----+----+
           |Unit   0 | 0  | 0  | 0  | 0  |
           |      ---+----+----+----+----+
           |Number 1 | 0  | 0  | 0  | 1  |
           |      ---+----+----+----+----+
           |       2 | 0  | 0  | 1  | 0  |
           |      ---+----+----+----+----+
           |       3 | 0  | 0  | 1  | 1  |
           +---------+----+----+----+----+
           |         |2(3)|2(2)|2(1)|2(0)|
           +---------+----+----+----+----+

14A 5 Address Mode Select
-------------------------
1 4 BIT Address Mode
0 2 BIT Address Mode

14A 6 Servo Offset Control
--------------------------
1 Servo Offset Disable
0 Servo Offset Enable

 14A 7 Motor Start Delay
 -----------------------
 1  30 Sec   The spindle motor driving is delayed within the time
 0   0 Sec   specified by Start Delay switches, even if the motor
             start-up conditions are satisfied. (DC power on and motor
             start mode satisfied).

             This feature prevents the overload of the source power by
             the disk drives.

             The start-up delay feature ensures that all the disk
             drives (up to two) in a multi-disk drive system
             configuration do not activate their power-up sequence
             operation simultaneously.

 14A 8 Motor Start Mode
 ----------------------
 1  Remote   The disk drive is started in either "REMOTE" or "LOCAL"
 0  Local    mode by th eselection of the switch bit 8 of "14A" DIP
             switch.

             LOCAL mode -
             enable DC power-on initiate the drive start up sequence.

             REMOTE mode -
             normally set to REMOTE at shipping, the drive is started
             by receiving ground level of the Power Sequence Hold line
             from the host system.

NOTE
Actual Spindle Motor rotation is initiated after completion of the
Start Delay time spending selected by the "START DELAY" DIP switches.

Dip Switch 13M
--------------

  0 +---------------+
    |x x x x x x x x|
  1 +8-7-6-5-4-3-2-1+
               | | |
               | | |
  Device Type  0|1|2     The switch 1 through bit 3 are assigned as
  --------------+-+-     the Device Type Setting switches.
  D2257        0|0|0     These switches are used for preset the
  D2247        0|0|1     Encoded Device Type code. The table shows the
               0|1|0     preset code for desired device Type code
               0|1|1     which is sent back to the controller when the
  D2247E       1|0|0     Device Type Request command issued.
               1|0|1
               1|1|0
               1|1|1

 13M 4  AM Mode Select
 ---------------------
 0  Address Mark inhibit  These switch is used to enable or disable
 1  Address Mark permit   of the ADDRESS MARK Writing and ADDRESS
                          MARK FOUND (Reading) functions.

 13M 5  RPS Mode Select
 ----------------------
 0  RPS Disable           These switch is assigned as a mode enable
 1  RPS Enable            input of the "Rotational Position Sensing"
                          function. Actually meaning to enable "Read
                          Sector" option.

13M 6 FWRF Mode Select
-----------------------
0 FWRF Inhibit These switch is assigned as a mode enable
1 FWRF Permit input of the "Format Write Release Option".

13M 7 TAG4 Control
-------------------
0 TAG4 Inhibit These switch is assigned as a gate input of
1 TAG4 Permit the "TAG 4 Operation" enabling or disabling.

13M 8 Interface Control
------------------------
0 OFF-LINE
1 ON-LINE

Dip Switch 14M
--------------

  0 +---------------+
    |x x x x x x x x|
  1 +8-7-6-5-4-3-2-1+         SECTOR SIZE
     | | | | | | | +-- F
     | | | | | | +---- 2(6)
     | | | | | +------ 2(5)
     | | | | +-------- 2(4)
     | | | +---------- 2(3)
     | | +------------ 2(2)
     | +-------------- 2(1)
     +---------------- 2(0)

The Sector Select Switch Assembly has 8 indepentend switches. The
Switch bit 1 (F) of the DIP SW is assigned as format setting switch.
Other switches bit 2 through bit 8 of the DIP SW are used for
selecting sectors.

Selectable number of sectors per revolution is from one (sector
equals track length) to 128 (divided 128 blocks).

The sector select switches shall be set by the simply same binary
value which is requested as the number of sectors by the system-
controller.

The "F" switch is provided for selection of a sector counting
formula from two formulas.

When N = Number of desired sectors:

1. Number of bytes per sector [Without Remainder]

        20480
    X = ----- (Bytes)
          N

2. Number of bytes per sector [Existing Remainder]

    X = 20480 - R
        --------- (Bytes)
           N

Protect Switch
--------------
The operation of the PROTECT toggle switch places the drive in the
write protected mode.

 Switch function of Operator Panel
 ---------------------------------
 1. STOP/(START) switch
    Closing the RTN (=signal ground) signal and this signal line
    causes the DKU to enter in the motor stop mode. When in the open
    status, this places the DKU in the start mode.

    The condition for DKU start is obtained by logical product with
    the POWER HOLD (HOLD) signal function of the "A" cable of the DKC
    interface.

 2. FAULT CLEAR switch function
    Closing the RTN signal and this signal line instructs the DKU to
    disengage the "FAULT" status.

 3. PROTECT/(PERMIT) switch
    Closing the RTN signal and this signal line places the DKU in the
    write protected status. When open, write is enabled. The "PROTECT"
    status for DKC corresponds to this signal function.

Display Funtion of Operator Panel
---------------------------------
As display functions, this panel permits drive outputs such as
"READY", "FAULT", and PROTECT" for lighr-emitting diodes (LED).

P56 Operator Panel Interface Connector
--------------------------------------
The connector for a Operator panel is located on the front side of
the Logic & Servo PWA.

   +---------+
   |o o o o 10    Side where cable-connector is plugged.
   |1 o o o o|
 --+---------+---

P57 Interface for Diagnostic Panel
----------------------------------
The Disk Drive provides an interface for connecting the DKU000-HLOG
Diagnostic Panel in a maintenance requirements.

Install

NEC D22X7 SERIES PRODUCT DESCRIPTION 806-220357-0 REV. E 8/1992

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!
      Never install PC board on the Top!

The disk drive can be mounted horizontally or vertically in a
limited space, such as the diskette drive storage cabinet.

Major Advantages of D22X7 disk drive
------------------------------------
- Entirely epoxy-coated parts prevents contamination
- Integrated cooling fan
- Unique locking mechanism
- Metal enclosure
- Motor electronics are located outside of HDA
- Optional power supply can drive two units
- High reliablity
- The best combination with the D7261 HDC LSI

 P3 DC Power Cable
 -----------------
  |                             Cable side housing
  +--1          1  GND          AMP P/N 87655-9 Post header assembly
  |xx|          2  +5V
  |xx|          3  +5V          Receptacle contact
  |xx|          4  -5V          AMP P/N 87027-1
  |xx|P3        5  -12V
  |xx|          6  GND ( 12V)   Cable wire
  |xx|          7  +12V         Nos. 18-22 AWG standard wire
  |xx|          8  +24V
  |xx|          9  24V-Return
  +xx9
  |

Air Flow/Service Area
---------------------
An air flow of one cubic meters per minute is recommended on a 10-cm
surface.

Terminator
----------
Transmission line termination must be used for efficient data flow.

Cable A
A terminator resistor is required at the transmitter and receiver
end of each transmission line of Cable A. This resistance is provided
on the unit by the terminator assembly.

A terminator resistance is required at the controller end of each
line of Cable A except for the Open Cable Detect line. No terminator
resistance is used on the Power Sequence lines in Cable A.

Cable B
A terminator resistance is required at the receiver end of each
transmission line of Cable B. This resistance is provided at the
receiver logic card for the receivers located within the drive.

Unit Cabling
------------
The I/O cable connection between the controller and the disk drives
uses daisy chain or radial cabling.

Signal Ground wire connection
-----------------------------
Signal grounding wire connect to the corresponding signal ground on
the interface logic PWA.

 I/O Cable Characteristics
 -------------------------
 +------------+-----------------------+-----------------------------+
 |Feature     |Cable A                |Cable B                      |
 +------------+-----------------------+-----------------------------+
 |Type        |Flat cable, 30 twisted |Flat cable, 26 conductor with|
 |            |pairs                  |ground plane and drain wire  |
 +------------+-----------------------+-----------------------------+
 |Impedance   |100    10              |130    15                    |
 +------------+-----------------------+-----------------------------+
 |Wire size   |28AWG, 7 strands       |28AWG, 7 strands             |
 +------------+-----------------------+-----------------------------+
 |Propagation |5.6 ns/m (nominal)     |5.5 ns/m (nominal)           |
 |Delay Time  |                       |                             |
 +------------+-----------------------+-----------------------------+
 |Maximum     |30 m                   |15 m                         |
 |Cable length|                       |                             |
 +------------+-----------------------+-----------------------------+
 |Voltage     |300 V rms              |300 V rms                    |
 |Rating      |                       |                             |
 +------------+-----------------------+-----------------------------+
 |Part Number |Spectra strip          |3M                           |
 |            |SS-455-248-60          |3476-26                      |
 +------------+-----------------------+-----------------------------+

 I/O Connectors
 --------------
 +-----+------------------+-----------------------------------+
 |Cable| I/O Assembly     | Logic Printed Wiring Assembly     |
 +-----+------------------+-----------------------------------+
 |  A  | 60-pin connector | 60-pin vertical adapter           |
 |     | 3 M #3334-6000 or| TPD #R60L                         |
 |     | equivalent       | NEC #802-7110100-560 or equivalent|
 +-----+------------------+-----------------------------------+
 |  B  | 26-pin connector | 26-pin vertical adapter           |
 |     | 3M #3399-300 or  | TPD #R26L                         |
 |     | equivalent       | NEC #802-710100-526 or equivalent |
 +-----+------------------+-----------------------------------+

 Terminators
 -----------
 +-------+----------------------------+------------+
 |Cable  | Terminator                 |            |
 +-------+----------------------------+            |
 |  A    | 898-1R56 (BECKMAN)         | 56 x 4 pcs.|
 |       | 16 Pin-DIP Module Resistor |            |
 +-------+----------------------------+------------+

P4 DC Power Connector
---------------------
The power input is achieved through a six-pin AMP connector, No.
1-380999-0.

  +-+  +-+     1  +24 VDC         Input Cable Side Connector
  |2+--+1|     2   24 V-return    Housing AMP P/N 1-480270-0
  |4+--+3|     3   12 V-return    Contact AMP P/N 60617-4 or 60619-4
  |6|  |5|     4  -12 VDC
  +-+  +-+     5   +5 VDC         Wire Size AWG #18
               6    5 V-return

SG Signal Ground Terminal
-------------------------
"SG" Cable side Terminal AMP PLASTI-GRIP TERMINAL
Wire Size AWG #18

Switches and Indicators
-----------------------
The dual-port interface requires the following switches and
indicators, located on the printed wiring assembly (PWA) of the dual-
port option kit.

 a. ROUTE-0 (Port A) control Switch and Indicators
    Switch "D" (=Disable)  - This position disables the Device
                             Selection from the ROUTE-0 control unit.
           "E" (=Enable)   - This position allows ROUTE-0 to be
                             selected.
    Indicator "RSV"        - This LED indicates that the reserve latch
                             is set to port A.
    Indicator "SEL"        - This LED indicated that the select latch
                             is set to port A.

 b. ROUTE-1 (PORT B) control switch and Indicators
    Switch "D" (=Disable)  - This position disables the Device
                             Selection from the ROUTE-1 control unit.
           "E" (=Enable)   - This position allows ROUTE-1 to be
                             selected.
    Indicator "RSV"        - This LED indicates that the reserve latch
                             is set to port B.
    Indicator "SEL"        - This LED indicated that the select latch
                             is set to port B.

 c. Release Time ON/OFF Switch
    "OFF"  -  This position inhibits the release timer, causing the
              drive to stay selected until specifically released by
              the operating control unit.

     "ON"  -  This position enables the release time to clear the
              reserve status 500 milliseconds (normal) following the
              last device selection. This allows alternate control
              unit access independent of the release command. The
              reserve timer will not clear a priority select.

  RELEASE TIME    ROUTE-1      ROUTE-0
     OFF-ON       Port B       Port A
                  Switch LED   Switch LED
 ----+-----+------+-----+------+-----+------
     |--O  |      |  O--|      |  O--|
     +-----+      +-----+      +-----+
                 D-E RSV SEL  D-E RSV SEL

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

Features

NEC D22X7 SERIES PRODUCT DESCRIPTION 806-220357-0 REV. E 8/1992

Introduction
------------
The NEC D22X7 Series Disk Drive is a compact, highly reliable, low
cost disk drive that stores up to 167.7 MB of unformatted data on 8-
inch disk platters. The storage capacity depends on the model used.
The disk drive uses fixed disk, Winchester-type technology, which
provides the most modern method of recording large amounts of data
for high speed, reliable computer accessability.

Media Error
-----------
No errors of either type will occur at Cylinder 0, Head 0.

Seek Error
----------
The seek error rate is less than one in 10(7) seeks.

Power Requirements
------------------
The D22X7 Series Disk Drive operates on dc power supplied externally.
The power comes from a separate dc power source or from the dc power
within a system configuration.

LED Indicators
--------------
Ready
The green "RDY" indicator lights when the unit is up to speed, the
heads are on cylinder, and even if a fault condition detected, the
indicator holds as far as the basic Ready conditions are beeing
satisfied.

Fault
The red "FLT" indicator lights up if a fault exists within the drive
it is turned off;

- Receiving a Fault Clear command
- A drive power up operation

Seek Error
The orange "SKE" indicator lights up if a seek error exists within
the drive. It is turned off;

- Receiving a Return-to-Zero command
- A drive power up operation

Tag 4 (Optional Feature)
------------------------
As a extended Interface feature, a Error detail status, The Device
Type Code, or RPS Sector of the disk drive, is sent back to the
controller by enabling the Tag 4 line in conjunction with the Bus
lines Bit 8 and Bit 9.













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