
A - 1 2 0 X T   ( 1 9 9 2 )    AREAL
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 2.5"/SUPERSLIMLINE    Cylinders    1070|  535|     |
Capacity form/unform   136/      MB        Heads           4|   10|     |
Seek time   / track  15.0/ 3.0 ms          Sector/track     |   50|     |
Controller           IDE / XT              Precompensation
Cache/Buffer            32 KB              Landing Zone
Data transfer rate    1.875 MB/S int       Bytes/Sector      512
                      5.630 MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5 V          Temperature *C         5 55    |    -40 60
Power: sleep          0.1 W     Humidity     %         8 80    |      8 80
       standby        0.2 W     Altitude    km    -0.061  3.048| -0.061 12.192
       idle           1.3 W     Shock        g        10       |    100
       seek           1.6 W     Rotation   RPM      2981
       read/write     1.6 W     Acoustic   dBA        35
       spin-up        3.0 W     ECC        Bit   56
                                MTBF         h     100000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,TUV,UL1950               

**********************************************************************
                        L   A   Y   O   U   T
**********************************************************************
AREAL    A-120/180  TECHNICAL MANUAL REV. 2.0, JULY 1, 1992

  +---------------------------------------------------------+
  |                                       NOT JUMPERS**     |
  |                                                  **     |XX44
  |                                                         |XX
  |                                                         |XX I
  |                                              ***        |XX N
  |                                              ***        |XX T
  |                                              123        |XX E
  |                                                         |X* R
  |                                                         |XX F
  |                                                         |XX A
  |                                                         |XX C
  |                                                         |XX E
  |                                                         |XX
  |                                                         |  2
  |                                                         |xx50
  +---------------------------------------------------------+




**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
AREAL    A-120/180  TECHNICAL MANUAL REV. 2.0, JULY 1, 1992

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

 User Options
 ------------
 There are three user configurable, jumper options located on the
 PCBA.

 +----------+-------+
 |     IN   | OUT   |
 +--+-------+-------+
 |1 |MASTER*|SLAVE  |
 +--+-------+-------+
 |2 |PDIAG  |PDIAG* |
 +--+-------+-------+
 |3 |SPARE  |SPARE* |
 +--+-------+-------+
 * Denotes Factory Setting

  +--------------+-----+        +--------------+-----+
  |Configuration |JMP1 |        |Configuration |JMP2 |
  +--------------+-----+        +--------------+-----+
  |Master Drive  |IN   |        |CAM PDIAG     |IN   |
  +--------------+-----+        +--------------+-----+
  |Slave Drive   |OUT  |        |Non CAM PDIAG |OUT  |
  +--------------+-----+        +--------------+-----+

 NOTE
 The Common Access Method (SAM) specification calls for PDIAG to be
 negated by the slave drive within 400 msec of the trailing edge of
 RESET. Most of the disk vendors, however, use the opposite polarity.



**********************************************************************
                      I   N   S   T   A   L   L
**********************************************************************
AREAL    A-120/180  TECHNICAL MANUAL REV. 2.0, JULY 1, 1992

 Notes on Installation
 =====================

 Recommended Mounting Configuration
 ----------------------------------

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
 +---------------------+           |  +-----+           +-----+  |
 +-+-----------------+-+           +--+                       +--+
   |                 |
   |                 |
   +-----------------+

 This drive is designed to be used in applications where the unit may
 experience extreme levels of both shock and vibration. There are no
 limits on mounting orientation and mounting clearance is not
 required. Maximum insertion length of the 3 mm x .5 screws is 0.15"
 (3.8 mm).


 Physical Connection - AT Interface
 ----------------------------------
 Both power and control signals are supplied to the drive through a
 single 44 pin cable. Please note that separate power is supplied to
 the logic and motor circuits to minimize noise coupling.

 Two drives may be daisy chained on a single cable, but the maximum
 total allowable cable length remains 18 inches.
 Recommended mating connectors are as follows:

 +-------------------+---------+-------------------+
 |Connector Style    |Dupont   | Elco              |
 +-------------------+---------+-------------------+
 |Flex Cable         |86456-044|N/A                |
 +-------------------+---------+-------------------+
 |Ribbon Cable       |N/A      |20-8394-2044-04-101|
 +-------------------+---------+-------------------+
 |PCBA Straight      |86455-044|20-8390-2044-00-101|
 +-------------------+---------+-------------------+
 |PCBA Rigth Angle   |88333-044|20-8390-2044-01-101|
 +-------------------+---------+-------------------+


 Electrical Description - AT Interface
 -------------------------------------
 All signal levels are TTL compatible. A logic "1" is from 2.0 volts
 to 5.0 volts. A logic "0" is from 0.0 volts to 0.7 volts.

 The interface between the drive adapter and the drive is termed the
 "Host Interface". The set of registers in the I/O space of the Host
 is known as the "Task File".

 All signals on the Host Interface have the prefix Host. All negativ-
 ely active signals are prefixed with a "-" designation. All positiv-
 ely signals are prefixed with a "+" designation. Signals whose source
 is the Host are "outbound" and those whose source is the drive are
 "inbound".

      +------+-------------------+------+----------------+
      | Pin  | Signal            | Pin  | Signal         |
      +------+-------------------+------+----------------+
      | 01   | -Host Reset       | 02   |  Gnd           |
      +------+-------------------+------+----------------+
      | 03   | +Host Data 7      | 04   | +Host Data  8  |
      +------+-------------------+------+----------------+
      | 05   | +Host Data 6      | 06   | +Host Data  9  |
      +------+-------------------+------+----------------+
      | 07   | +Host Data 5      | 08   | +Host Data 10  |
      +------+-------------------+------+----------------+
      | 09   | +Host Data 4      | 10   | +Host Data 11  |
      +------+-------------------+------+----------------+
      | 11   | +Host Data 3      | 12   | +Host Data 12  |
      +------+-------------------+------+----------------+
      | 13   | +Host Data 2      | 14   | +Host Data 13  |
      +------+-------------------+------+----------------+
      | 15   | +Host Data 1      | 16   | +Host Data 14  |
      +------+-------------------+------+----------------+
      | 17   | +Host Data 0      | 18   | +Host Data 15  |
      +------+-------------------+------+----------------+
      | 19   |  Gnd              | 20   |  Key           |
      +------+-------------------+------+----------------+
      | 21   | Not Connected     | 22   |  Gnd           |
      +------+-------------------+------+----------------+
      | 23   | -Host IOW         | 24   |  Gnd           |
      +------+-------------------+------+----------------+
      | 25   | -Host IOR         | 26   |  Gnd           |
      +------+-------------------+------+----------------+
      | 27   | -IOCHRDY          | 28   |  Not Connected |
      +------+-------------------+------+----------------+
      | 29   | Not Used          | 30   |  Gnd           |
      +------+-------------------+------+----------------+
      | 31   | +Host IRQ         | 32   | -Host IO16     |
      +------+-------------------+------+----------------+
      | 33   | +Host Address 1   | 34   | -Host PDIAG    |
      +------+-------------------+------+----------------+
      | 35   | +Host Address 0   | 36   | +Host Address 2|
      +------+-------------------+------+----------------+
      | 37   | -Host CS0         | 38   | -Host CS1      |
      +------+-------------------+------+----------------+
      | 39   | -Host Active/Slave| 40   |  Gnd           |
      +------+-------------------+------+----------------+
      | 41   | +5 Volt Logic     | 42   | +5 Volt Motor  |
      +------+-------------------+------+----------------+
      | 43   |  Gnd              | 44   | +AT Interface  |
      +------+-------------------+------+----------------+



 Air Filtration System
 ---------------------
 Recirculated air is forced through a .3 micron filter, providing
 a clean environment for the recording heads and disks.



**********************************************************************
                      F   E   A   T   U   R   E  S
**********************************************************************
AREAL    A-120/180  TECHNICAL MANUAL REV. 2.0, JULY 1, 1992

 Introduction
 ------------
 The Areal Models A120 and A180 are 2.5 inch, high capacity,
 ruggedized, high performance, low power, low profile disk drives. By
 design, they are ideal for notebook, laptop, or portable
 applications.

 Both units incorporate the IBM PC-AT/XT Task File control logic and
 requires only chip select decode logic to allow bus connection. This
 logic is included in a number of commercially available adapter
 boards.


 Key Features
 ------------

 - Automatic Error Correction and Retries

 - Automatic Microprocessor Controlled Diagnostics

 - Buffer Size of 32 KB

 - Embedded Servo System

 - Extremely Low Power Requirement (5 Volt only)

 - Internal Air Filtration System

 - Master/Slave Compatibility

 - Programmable Low Power Modes

 - Universal Translation

 - 100 G Non-Operation Shock Tolerance


 Error Correction
 ----------------
 The A120/180 employs a 56 bit ECC polynomial capable of correcting
 single burst errors up to 21 bits. Single burst errors up to 56 bit
 and double burst errors up to 41 bits can be detected.


 Seek Time
 ---------
       +----------------------------------+--------+
       |                                  | 120/180|
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   3    |
       +----------------------------------+--------+
       |Average                msec. typ. |  15    |
       |                       msec. max. |  24    |
       +----------------------------------+--------+
       |Latency                msec. avg. |  10.1  |
       +----------------------------------+--------+


 Drive Mechanism
 ---------------
 A brushless DC motor rotates the spindle at 2981 RPM. Back EMF of the
 motor is used to quickly stop the spindle when power is removed.


 Read/Write Heads and Disks
 --------------------------
 Data is recorded on two 65 mm diameter glass disks using longitudinal
 recording thin film heads.


 Head Positioner Mechanism
 -------------------------
 Four read/write heads are positioned using a rotary voice coil
 actuator.


 Read/Write and Control Electronics
 ----------------------------------
 Internally, a single IC is mounted in close proximity to the heads to
 control head selection, read preamplification, and the write data
 circuitry. The read/write heads are mounted to a voice coil actuator.

 The microprocessor controlled circuit board provides the remaining
 electronic functions which include:

 - Spindle Motor Control      - Interface Control

 - Power Management           - Read/Write Circuitry

 - Rotary Actuator Control    - Spin Speed Control

 The microprocessor performs an extensive battery of tests when power
 is applied and will not come READY if an error is detected.


 Error Reporting
 ---------------
 When the drive receives a command from the Host, it checks for
 validity of the command, and with the exception of the Initialize
 Drive Parameters command, also checks register values for valid
 range. If the values are invalid, the drive does not execute the
 command, but instead posts the "ERR" bit in the Status register and
 the "ABRT" bit in the Error register.

 If a data error occurs during command execution, the command is
 terminated immediately.


