
T M 7 0 3    TANDON
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders     695|     |     |
Capacity form/unform    30/   36 MB        Heads           5|     |     |
Seek time   / track  45.0/ 5.0 ms          Sector/track   17|     |     |
Controller           MFM / ST506           Precompensation   300
Cache/Buffer               KB              Landing Zone      694
Data transfer rate    0.625 MB/S int       Bytes/Sector      512
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         4 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |
       standby            W     Altitude    km            3.650|        12.000
       idle               W     Shock        g                 |
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      11000
                                Warranty Month
Lift/Lock/Park     YES          Certificates                                  

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TANDON   TM703  PRODUCT SPECIFICATION AND USER'S MANUAL 1984

  +---------------------------------------------------------+
  |                                                         |XX
  |                                                         |XX J12
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX J11
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |
  |                                                         XX J7
  |                                                         XX
  +---------------------------------------------------------+Power



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TANDON   TM703  PRODUCT SPECIFICATION AND USER'S MANUAL 1984

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

 Drive Address Guide
 -------------------

  +------------------------+---------------+-------------+
  |Shunt Pack Location 7D  |Drive Address  |Jumper Plug  |
  +------------------------+---------------+-------------+
  |Connect Pin 4 to Pin 5  |Drive Select 0 |    E4       |
  |Connect Pin 3 to Pin 6  |Drive Select 1 |    E5       |
  |Connect Pin 2 to Pin 7  |Drive Select 2 |    E6       |
  |Connect Pin 1 to Pin 8  |Drive Select 3 |    E7       |
  +------------------------+---------------+-------------+

 The drive address is determined by either a jumper plug or a shunt
 pack located on the logic circuit board.



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TANDON   TM703  PRODUCT SPECIFICATION AND USER'S MANUAL 1984

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

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

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


 Mounting the Drive
 ------------------
 The drive can be mounted in any vertical or horizontal plane. On the
 TM703, eight 6-32 tapped holes are provided for mounting: two on each
 side and four on the bottom of the frame. The drive is manufactured
 with some critical internal alignments that must be maintained.
 Hence, it is important the mounting hardware does not introduce
 significant stress on the drive.

 Any mounting scheme in which the drive is part of the structural
 integrity of the enclosure is not permitted. Mounting schemes should
 allow for adjustable brackets or incorporate resilient members to
 accommodate tolerances.

 A sway of 0.1 inch is required between the top of the head disk
 assembly and other assemblies in the user system to allow for
 movement of the housing on its shock mounts.


 Air Filtration
 --------------
 A self-contained, recirculating air filtration system supplies clean
 air through a 0.3-micron filter. A secondary breather filter is
 provided to allow pressure equalization with the ambient atmosphere
 without contamination. The entire head-disk-actuator compartment is
 maintained at a slightly positive pressure to further ensure an
 ultraclean environment.


 Interface Connectors
 --------------------
 The electrical interface between the drive and the host system is via
 three connectors. J11 provides control signals for the drive. J12
 provides for the radial connection of read/write data signals. J7
 provides for D.C. power.


 J11 Connector
 -------------
 Connection to J11 is through a thirty-four-pin circuit board
 connector. The pins are numbered 1 through 34. The even pins are
 located on the component side of the circuit board. Pin 2 is located
 on the end of the circuit board connector closest to the DC power
 connector J7, and is labeled.

 A key slot is provided between Pins 4 and 6. The recommended mating
 connector for P11 is 3M ribbon connector P/N 3463-0001, without
 ears.


 J12 Connector
 -------------
 Connection to J12 is through a twenty-pin circuit board edge
 connector. The pins are numbered 1 through 20. The even pins are
 located on the component side of the circuit board. The recommended
 mating connector for J12 is 3M ribbon connector P/N 3461-0001,
 without ears. A key slot is provided between Pins 4 and 6.


 J7 Connector
 ------------
 D.C. power connector J7 is a four-pin AMP Mate-N-Lok connector, P/N
 350211-1, mounted on the solder side of the circuit board. The
 recommended mating connector, P7, is AMP P/N 1-480424-0, utilizing
 AMP pins P/N 60619-4. J7 pins are labeled on the J7 connector. J7
 cabling must be 18 AWG minimum.

    /------------\ As seen on drive circuit board, solder side.
    | 4  3  2  1 | Pin 1 = +12V  Pin 2 = return
    +------------+ Pin 3 = +5V return Pin 4 = +5V


 Interface Line Descriptions
 ---------------------------
 The interface for the TM703 drive is avilable in one configuration.
 It is compatible with ST506/412 indutry standard drives.
 Compatibility is defined as using the same pin assignment where the
 signal and function are common.

 The interface may be connected in the radial or daisy chain
 configuration.


 Frame Ground Connector
 ----------------------
 The frame ground connector is Faston AMP P/N 61761-2. The recommended
 mating connector is AMP P/N 62187-1. To realize error rates, it must
 be connected directly to the centrally located logic ground via an
 18 AWG, minimum, cable.



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TANDON   TM703  PRODUCT SPECIFICATION AND USER'S MANUAL 1984

 Introduction
 ------------
 This manual provides useful information to assist the customer when
 incorporating the Tandon rigid disk drive into a system.

 The TM703 disk drive is a low cost, compact unit that uses a moving
 head noncontact recording with standard Winchester technology on a
 5-1/4 inch rigid media. The form factor and voltage requirements for
 the drive are identical to those of Tandon Corporation's TM100 family
 of flexible disk drives.

 The storage media is contained within the drive in a fixed, non-
 operator-removable configuration.


 Purpose of the Drive
 --------------------
 The 5 1/4 inch disk drive is a rotating disk memory device designed
 for random access data storage and retrieval. Typical applications
 include word processing systems, entry level microprocessor systems,
 intelligent calculators, program storage, small business computer
 systems, and any application in which low cost, high speed random
 access data storage is required.


 Microprocessor Control
 ----------------------
 The TM703 drive features an onboard microprocessor, providing four
 major functions:

 1. Self-calibration on power-up.

 2. Seek timing for the head positioning mechanism.

 3. Write current switching for optimal data recording quality.

 4. Power and track fault detection.


 Functional Description
 ----------------------
 The drive is fully self-contained and requires no
 operator intervention during normal operation. During the power-up
 sequence, the spindle motor reaches 3,600 RPM, and the positioning
 mechanism recalibrates the recording heads back to Track 0. Then, the
 heads go through a seek to maximum cylinder and back to cylinder
 zero. If the head are positioned on cylinder zero, the drive is
 ready for operation. The activity lamp is on during this power-up
 sequence. When the drive is ready, the lamp goes off.

 If the drive does not pass the power-up seek test, the activity lamp
 will flash on and off. To recover from a failure, one must turn
 power to the drive off and back on.

 The head is positioned over the desired track by means of a voice
 coil, closed loop rotary positioning system, its associated
 electronics, and a servo pattern written on the servo surface of the
 media. Typically, the drive uses MFM write and read data recording
 methods. Data recovery electronics include a low-level read
 amplifier, differentiator, a zero-crossover detector, and digitizing
 circuits. No data decoding feature is provided on the drive. The
 magnetic pick-up and index hole positioned to provide an analog
 signal when an index hole is detected.


 Seek Time
 ---------
       +----------------------------------+--------+
       |                                  | TM703  |
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   5    |
       +----------------------------------+--------+
       |Average                msec. typ. |  45    |
       +----------------------------------+--------+
       |Head Settling Time     msec.      |   2    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.33 |
       +----------------------------------+--------+


 Power Sequencing
 ----------------
 The +5 volt and +12 volt power must be applied together. The
 microprocessor starts the spindle motor when both voltages are
 active.


 Soft and Hard Read Error Rates, Exclusive of Media Defects
 ----------------------------------------------------------
 For data that has been verified previously as error free, and when
 used in conjunction with a data separator and phase lock loop of good
 design, the recoverable (soft) error rate for any subsequent read
 operation shall not exceed one error in 1 x 10(10) bits transferred.
 A recoverable read error is an error that may be corrected within
 five attempts to reread the data.

 The nonrecoverable (hard) read error rates shall not exceed one error
 in 1 x 10(12) bits transferred. A nonrecoverable read error is an
 error that may not be corrected within five attempty to reread data,
 providing that the writing of the data previously has been verified
 as correct. The seek error rate is not exceed one error in 1 x 10(6)
 seeks.


 Media Defects
 -------------
 Any defects on the media surface will be identified on a defect map
 provided with each drive. This defect map will indicate the head
 number, track number, and the number of bytes from index for each
 defect. Each defect shall be no longer than 16 bits. More
 than one defect per track is to be counted as one defect. Cylinders
 000 and 001 are guranteed error free.

 The defect map is offered as a guide only. The number of defects and
 their locations can change due to customer system variations, such
 as data separators.

 NOTE
 On power down, the heads latch in the innermost position.


 Mean Time Between Failures            11,000 power on hours
 Mean Time To Repair                   30 minutes
 Component Design Life                 5 years
 Preventative Maintenance              Not Required


 Dust Cover
 ----------
 The design of an enclosure should incorporate a means to prevent
 contamination from loose items (e.g. dust, lint, and paper chad)
 since the drive does not have a dust cover.


