
1 3 7 3 A    MICROPOLIS
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    1024| 1018|     |
Capacity form/unform    91/  107 MB        Heads           5|     |     |
Seek time   / track  23.0/ 5.0 ms          Sector/track   36|   35|     |
Controller           SCSI1 SINGLE-ENDED    Precompensation
Cache/Buffer               KB              Landing Zone
Data transfer rate    1.600 MB/S int       Bytes/Sector      512
                            MB/S ext
Recording method     RLL                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 65
Power: sleep              W     Humidity     %        10 90    |     10 90
       standby       31.5 W     Altitude    km    -0.061  3.048| -0.305 15.240
       idle               W     Shock        g         3       |     50
       seek          37.5 W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        51
       spin-up            W     ECC        Bit
                                MTBF         h      30000
                                Warranty Month
Lift/Lock/Park     YES          Certificates                                  

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MICROPL. 1370 SERIES  PRODUCT DESCRIPTION 101689 REV. D

  +---------------------------------------------------------+
  |                                                   W1+-+ |X1
  |                                                   W2| | |XX
  |                                                     +-+ |XX    J1
  |  COMPONENT SIDE                                      ++ |XX
  |                                                   RN1|| |XX
  |                                                      ++ |XX
  |                                                      ++ |XX
  |                                                   RN7|| |XX
  |                                                      ++ |XX
  |                                                      ++ |XX
  |                                                   RN8|| |+-+ID0
  |                                                      ++ || |ID1 J2
  |                                                         || |ID2
  |                                                         || |W3
  |                                                         || |W18
  |                                                         || |
  |                                                         || |
  +---------------------------------------------------------++-+






     +--------------------------------------+
     |       ++J4                           |
     |       ++                             |
     |          ++J5                        |
     |  J3 Power++                          |
     |  XXXXXX1                             |
     |      J2             J1               |
     |  ............. XXXXXXXXXXXXXXXXXXXX  |
     +--------------1--------------------1--+



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MICROPL. 1370 SERIES  PRODUCT DESCRIPTION 101689 REV D

 Jumper setting
 ==============

 x = Jumper set at factory


 J2  Drive Select  ID2/ID1/ID0
 -----------------------------
  +--------+------------------------+
  |Drive   |    Select Jumpers      |
  |Address |   ID2    ID1    ID0    |
  +--------+------------------------+
  |x 0     |   OPEN   OPEN   OPEN   |
  |  1     |   OPEN   OPEN   CLOSED |
  |  2     |   OPEN   CLOSED OPEN   |
  |  3     |   OPEN   CLOSED CLOSED |
  |  4     |   CLOSED OPEN   OPEN   |
  |  5     |   CLOSED OPEN   CLOSED |
  |  6     |   CLOSED CLOSED OPEN   |
  |  7     |   CLOSED CLOSED CLOSED |
  +--------+------------------------+
 Up to eight devices (any combination of hosts and targets) can be
 attached to an SCSI bus. The 1370 Series has three ID jumpers. These
 three jumpers are used to assign one of the eight SCSI ID bits (0
 through 7) to the drive.

 In multiple-device systems, each drive must have its own unique ID
 bit.

 Interface Terminator packs RN1, RN7, and RN8 provide proper termina-
 tion for the interface lines. For a multiple-drive system, the
 terminators are installed in the LAST drive on the cable.



 J2  Multi-Function Connector/Jumper Block
 -----------------------------------------
 Multi-Function Connector/Jumper Block J2 can be used to connect the
 drive to a user-supplied operator-panel.

 J2 Pin 23  Logic ground

        24  Not used

        25  Write Protect Input. Logic Ground disables writing and
            lights the Write Protect LED

        26  Ready output. Logic ground indicates the drive is Ready
            and lights the Ready LED

        27  +5V source for the LEDs.



 W1/W2  Bus Termination Power Option
 -----------------------------------

   +---------------+------------------------------------+
   |        Jumpers|                                    |
   |  W1   |  W2   |                                    |
   +-------+-------+------------------------------------+
   | CLOSED| OPEN  |The drive provides terminator power |
   |       |       |to its on-board terminators         |
   |       |       |(Factory default configuration)     |
   +-------+-------+------------------------------------+
   | OPEN  | CLOSED|Terminator power is provided by the |
   |       |       |host via interface cable J1, pin 26 |
   +-------+-------+------------------------------------+

 A jumper is installed at W1 or W2 to select the source of terminator
 power (+5V) for the terminator packs on the Device Electronics board.



 W3  Spindle Control Option
 ---------------------------
     CLOSED  The drive must wait for a START UNIT command to start the
             spindle motor.
     OPEN    The drive automatically starts the spindle motor at
             power-on. (Factory default configuration)



 W18  Bus Parity Check Option
 ----------------------------
     CLOSED  The drive neither generates nor detects parity.
     OPEN    The drive generates parity and enables parity detection.
             (Factory default configuration)




 J3   DC Power and pin connector assignments
 -------------------------------------------
      +------------+   pin 1    +12 VDC
      | 4  3  2  1 |   pin 2    +12 Return
      +------------+   pin 3    + 5 Return
                       pin 4    + 5 VDC


 J4/J5  Ground Connectors
 ------------------------
 3/16-inch spade lugs J4 and J5 are provided for grounding.



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MICROPL. 1370 SERIES  PRODUCT DESCRIPTION 101689 REV. D

 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


 Dimensions and Mounting
 -----------------------
 The 1370 series uses industry-standard mounting techniques for
 5 -inch half-height Winchester disk drives.

 Recommended orientation is vertical on either side, or horizontal
 with the Device Electronics board down; other mounting orientations
 may be used provided the ambient air temperature around the drive is
 kept at or below 50*C (122*F).

 Inasmuch as the drive frame acts as a heat sink to dissipate heat
 from the unit, the enclosure and mounting structure should be
 designed to allow natural convection of heat around the HDA and
 frame. If the enclosure is small or natural convetion is limited,
 a fan may be required.


 Mounting Screws
 ---------------
 2 per side 6-32 UNC-2B x 0.25 deep
 4 on bottom 6-32 UNC-2B x 0.22 deep

 Caution: Screws must be selected so that they do not penetrate the
 mounting holes more than .25 inches. Maximum torque applied to the
 screws must not exceed 10 in-lbs.



 Interface Electrical Characteristics
 ------------------------------------
 Interface control and status signals are digital (open collector TTL)
 utilizing industry-standard transmitters and receivers which provide
 a terminated, single-ended system.

 The assigned signals are terminated with 220 ohms to +5V (nominal)
 and 330 ohms to ground at each end of the cable. All signals use
 open-collector or three-state drivers.

 Single-ended drivers and receivers allow a maximum cable length of
 6.0 meters (primarily for connection within a cabinet). A stub length
 of no more than 0.1 meters is allowed off the mainline interconnec-
 tion within any connected equipment.

 Signal transmission requires a single 50-conductor cable. A
 characteristic impedance of 100 ( 10%) ohms is recommended for un-
 shielded flat or twisted pair ribbon cable.

   a. Input Characteristics
      Each receiverd signal has the following characteristics when
      measured at the interface connector.

      1)  Signal true = 0.0 VDC to 0.8 VDC
      2)  Maximum total input load = -0.4 milliamps at 0.4 VDC
      3)  Signal false = 2.0 VDC to 5.25 VDC
      4)  Minimum input hysteresis = 0.2 VDC

   b. Output Characteristics
      Each driven signal has the following characteristics when
      measured at the interface connector.

      1)  Signal assertion = 0.0 VDC to 0.4 VDC
      2)  Minimum driver output capability = 48 milliamps (sinking) at
                                             0.5 VDC.
      3)  Signal negation = 2.5 VDC to 5.25 VDC

   c. Terminator Power (TERMPWR at Pin 26)
      Terminator Power has the following requirements:

      V(TERM) = 4.0 VDC to 5.25 VDC

      800 milliamps minimum source drive capability.

      1.0-milliamp maximum sink capability (except for the purposes of
      providing power to an internal terminator) with 1.0 mp
      recommended current limiting (e.g., a fuse).

 The 1370 Series provides keyed connectors to prevent accidental
 grounding or misconnection of terminator power.


 Signal Connector J1
 -------------------
 J1 is a 50-pin connector. Signal interface connection is made via
 this connector. The signals on J1 include the 8-bit SCSI bus and
 various control and handshaking lines.

 Recommended Cable: 3M Scotchflex 3365/50 or equivalent.
 Mating connector:  3M P/N 3425-3000 or equivalent.


 J2 Multi-Function Connector/Jumper Block
 ----------------------------------------
 J2 is a 28-pin multi-function connector/jumper block used for
 connecting the drive to a user-supplied Operator Panel. J2 is also
 available for future drive options.


 J3  DC Power Connector
 ----------------------
 J3 is a 4-pin, keyed, AMP MATE-N-LOCK connector on the Motor Control
 board. Both +5V and +12V is supplied to the drive via this connector.

 Mating Connector:      AMP 1-480424-0 or equivalent
             Pins:      AMP 350078-4

 Suggested Wire Size:   18 AWG


 Ground Connectors J4 and J5
 ---------------------------
 3/16-inch spade lugs J4 and J5 are provided for grounding. Systems
 characteristics determine proper ground connection.

 Mating connector: AMP 60972-2 or equivalent.



 Multiple-Drive Systems
 ----------------------
                                             Drive #1
  +------HOST------+                 +-----------------+
  |                +--+-SCSI-BUS-----+ J1              |
  |                |  |       +------+ J3   J4/J5      |
  |                |  |       |      +--------+--------+
  |                |  |       |               +------------------+
  +----------------+  |       |              Drive #2            |
                      |       |      +-----------------+         |
                      +-------+------+ J1              |         |
                      |       o------+ J3   J4/J5      |         |
                      |       |      +--------+--------+         |
                      |       |               +------------------+
                      |       |              Drive #3            |
                      |       |      +-----------------+         |
                      +-------+------+ J1              |         |
                      |       o------+ J3   J4/J5      |         |
                      |       |      +--------+--------+         |
                      |       |               +------------------+
                      |       |              Drive #4            |
                      |       |      +-----------------+         |
                      +-------+------+ J1  RN1 RN7 RN8 |         |
           ---DC-VOLTAGES-----o------+ J3   J4/J5      |         |
                                     +--------+--------+         |
           ---GROUND--------------------------+------------------+

 Interface Terminators RN1, RN7, and RN8 are installed ONLY in the
 last physical drive in the control chain.

 Connectors J4 and J5 are provided for grounding; system character-
 istics determine the proper ground connection.

 Up to seven 1370-series drives can be connected to a single host.

 Adjustments and Maintenance
 ---------------------------
 The 1370 Series requires no adjustments or periodic maintenance;
 additionally, no mechanical adjustments are required to prepare a
 system for handling or shipment.


 Field-Replacable Components
 ---------------------------
 The concept of repair by replacement of complete functional
 components is utilized in the 1370 Series, resulting in an MTTR of
 less than 15 minutes.


 Air-Filtration System
 ---------------------
 Air is circulated throughout the clean area by disk rotation-
 induced flow. A ducted air-filtration system draws the air through a
 filter. The sealed area breathes to the outside via a another filter
 for pressure equalization.


 Drive Motor
 -----------
 Spindle rotation is provided by a quiet, brushless, direct-coupled
 DC motor. Switching information for the electronic commutator is
 supplied by three Hall-effect sensors mounted within the drive-motor
 assembly.



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MICROPL. 1370 SERIES  PRODUCT DESCRIPTION 101689 REV. D

 Interface
 ---------
 The 1370 Series is fully compatible with the Small Computer System
 Interface (SCSI) proposed by the American National Standards
 Committee.


 Seek Time
 ---------

                                          | 1370   |
        ----------------------------------+--------+
        Track-to-Track         msec. typ. |   5    |
                       Average msec. typ. |  23    |
                               msec. max  |  50    |
        One-Third Stroke       msec. max. |  25    |
        Latency                msec. avg. |   8.33 |
                 Nominal       msec. max. |  16.67 |
        ----------------------------------+--------+



 Formatted Capacity Calculation
 ------------------------------
 The formatted capacity of the 1370 Series depends upon a number of
 user-selectable variables. The following formula is used to calculate
 the formatted capacity (C) of the 1370 Series using track-oriented
 sparing:

 C = [(SPT - SPARE_SPT) x HDS] x (1024 - 3 - SPARE_CYL) x (BYTES)

 SPARE SPT is the number of spare sectors per track. This value
 is user programmable from 0 to 3; a typical value for sparing is 1.
 1024 is the number of physical cylinders.

 3 cylinders, used by the drive, are not user accessible.

 SPARE CYL is the number of spare cylinders. This is userprogrammable;
 a typical value for sparing is 3.


