
P Y X I S - 2 7    AMPEX
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders     320|     |     |
Capacity form/unform    20/   26 MB        Heads           8|     |     |
Seek time   / track  98.0/23.0 ms          Sector/track   32|     |     |
Controller           MFM / ST412           Precompensation   132
Cache/Buffer               KB              Landing Zone
Data transfer rate    0.625 MB/S int       Bytes/Sector      256
                      0.625 MB/S ext
Recording method     MFM                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 70
Power: sleep              W     Humidity     %        10 85    |      5 90
       standby            W     Altitude    km    -0.305  3.048|        12.192
       idle               W     Shock        g         3       |
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA        54
       spin-up            W     ECC        Bit
                                MTBF         h
                                Warranty Month
Lift/Lock/Park     NO           Certificates                                  

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AMPEX    PYXIS  TECHNICAL MANUAL 3315507-01 REV. B, 8/83

                                         Drive Selection
                                          1------4
  +---------------------------------------+------+----------+  1
  |                                                         |XX Power
  |                                                         |XX P3
 ++ LED2            COMPONENT SIDE                          |
 ++                                                      ++ 1XX
 ++ LED1                                                 || |XX P1
 ++                                                  SIL1|| |XX
  |                                                      || |XX
  |                                                      || |XX
  |                                                      +1 |XX
  |                                                         |
  |+J4                                                      1XX
  |||                                                       |XX
  |||                                                       |XX
  |||                                                       |XX P2
  |+1                                                       |XX
  +---------------------------------------------------------+



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                      J   U   M   P   E   R   S
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AMPEX    PYXIS  TECHNICAL MANUAL 3315507-01 REV. B, 8/83

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

 Multiple-Drive Configuration
 ----------------------------
 The Pyxis disk drive can be connected in a daisy-chain configuration
 with up to four drives in the chain. Each drive has a four-pole drive
 switch, accessible through a port in the SIDE BRACKET, which is used
 to identify the drive in the chain. To identify a drive, the pole
 corresponding to the number of the drive in the chain is closed. Only
 one pole in each drive switch should be in the closed position.

            +---------+------+------+------+------+
            |Drive    |Pin 1 |Pin 2 |Pin 3 |Pin 4 |
            |Select   |      |      |      |      |
            +---------+------+------+------+------+
            |  1      |CLOSED|OPEN  |OPEN  |OPEN  |
            +---------+------+------+------+------+
            |  2      |OPEN  |CLOSED|OPEN  |OPEN  |
            +---------+------+------+------+------+
            |  3      |OPEN  |OPEN  |CLOSED|OPEN  |
            +---------+------+------+------+------+
            |  4      |OPEN  |OPEN  |OPEN  |CLOSED|
            +---------+------+------+------+------+



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AMPEX    PYXIS  TECHNICAL MANUAL 3315507-01 REV. B, 8/83

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

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

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


 Equipment Mounting
 ------------------
 Side brackets with tapped holes are provided with each drive and
 permit base or side mounting. These brackets are fixed to the drive
 chassis via shock-absorbing grommets. The drive can be oriented in
 any axis. When installing into an enclosure, at least 0.1 inch
 clearance must be maintained around the entire drive to allow
 vibration isolation, prevent obstruction of the breather filter, and
 prevent creation of ground loops.


 Cable Interconnection - Daisy-Chain Configuration
 -------------------------------------------------

       HOST
   +-----------+                                +-----------------+
   |           +---o---Control------------------+J1     Drive 1   |
   |           |   |    +-------Data------------+J2               |
   |           |   |    |         DC IN---------+J3  J4           |
   |           |   |    |                       +-----+-----------+
   |           |   |    |              DC GND---------+
   |           |   |    |                       +-----------------+
   |Controller |   o----+-----------------------+J1     Drive 2   |
   |           |   |    | +---------------------+J2               |
   |           |   |    | |       DC IN---------+J3  J4           |
   |           |   |    | |                     +----+------------+
   |           |   |    | |           DC GND---------+
   |           |   |    | |                     +-----------------+
   +-----------+   o----+-+---------------------+J1     Drive 3   |
   |           |   |    | | +-------------------+J2               |
   |           +---+----+ | |     DC IN---------+J3  J4           |
   |           +---+------+ |                   +-----+-----------+
   |           |   |        |         DC GND----------+
   |Data       +---+--------+                   +-----------------+
   |Separator  |   +----------------------------|J1     Drive 4   |
   |           +--------------------------------+J2               |
   |           |                  DC IN---------+J3  J4           |
   +-----------+                                +-----+-----------+
                                      DC GND----------+

 In the daisy-chain configuration, the line terminator pack is re-
 moved for all drives except for the last one in the chain. All drives
 are supplied for single usage (i.e., pole 1 is closed and the
 terminator pack is installed).


 Grounding
 ---------
 Host and disk drive logic ground are connected together by twisted-
 pair connector J3. The frame ground is isolated from the HDA (dc
 ground) b yrubber grommets. Both logic and HDA grounds are connected
 internally via a master board standoff.

  +--------------+                          +----------------+
  |              |                          |                |
  |     HOST     |                          |     DISK       |
  |              |                          |J3   DRIVE      |
  |              |                          +--+             |
  |              +---+----+5-VDC------------+4 |             |
  |   +----------+---+----+5-Return---------+3 +----+        |
  |   |          +---+---+12-VDC------------+1 |    |        |
  |   o----o-----+---+---+12-Return---------+2 +----o        |
  |   |    |     |                          +--+    |        |
  |   |    |     |                          |       |        |
  | Logic  |     |                          +--+    |        |
  |        o-----+--------------------------+J4+----o        |
  |        |     |                          +--+    |        |
  |        |     |                          |       |        |
  |      DC GND  |                          |     DC GND     |
  |              |                          |                |
  +--------------+                          +----------------+


 Preinstallation Checks
 ----------------------
 There are no preinstallation checks on the Pyxis disk drive.


 System Installation
 -------------------
 Installation of the drive consists of connecting the power, control
 and read/write (data) cables from the host system to the drive.


 Connector and Cable Requirements
 --------------------------------
 The cable connectors required are standard-insulation, displacement-
 type connectors designed for use with flat-ribbon or twisted-pair
 cable.
    +----------------------+-------------------------------------+
    | Cable Connector      |  Description                        |
    +----------------------+-------------------------------------+
    | Control cable        |                                     |
    | Cable Connector J1   |  34-position, AMP P/N 88373-3       |
    +----------------------+-------------------------------------+
    | Read/write cable     |                                     |
    | Cable Connector J2   |  20-position, AMP P/N 88373-6       |
    +----------------------+-------------------------------------+
    | Power Connector J3   |  Mate-N-Lok 4-pin AMO P/N 350211-1  |
    +----------------------+-------------------------------------+
    | Ground Connector J4  |  Faston AMP P/N 61664-1             |
    +----------------------+-------------------------------------+
        Equivalent connectors from other vendors may be used.


 Control Cable
 -------------
 The control cable (J1) carries the control and status information
 which is exchanged between the drive and the control unit in the host
 system.


 Read/Write (Data) Cable
 -----------------------
 All differential MFM coded data transmitted between the disk drive
 and the host system is carried by the read/write cable (J2)


 Power Cable
 -----------
 The disk drive requires only dc power which is supplied by the host
 system on power cable J3.

   pin 1    +12 VDC
   pin 2    +12 Volts Return
   pin 3    + 5 Volts Return
   pin 4    + 5 VDC


 Ground Connector
 ----------------
 Ground connector J4 connects disk drive dc ground to the host system
 dc ground.


 Terminator
 ----------
 If the drive is the last drive in a daisy-chain installation or is
 the only drive connected to the host system controller, a removable
 resistor terminator pack (provided with each drive) must be installed
 for the control interface (J1) lines.



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                      F   E   A   T   U   R   E  S
**********************************************************************
AMPEX    PYXIS  TECHNICAL MANUAL 3315507-01 REV. B, 8/83

 General Description
 ===================
 The Pyxis Model 7/13/20/27 disk drives are fixed-media, random-
 access, rotating memory storage devices that enable the central
 processing unit (CPU) of a data processing system to store and re-
 trieve blocks (records) of data on rotating disks. The drive can
 operate as a single stand-alone input/output device for the CPU, or
 it can operate with other similar disk drives in a daisy-chain
 configuration.

 There are four disk drives (Models 7, 13, 20, and 27) in the Pyxis
 series containing 1, 2, 3 or 4 magnetic disks which range in total
 data storage from 6.7 megabytes to 26.67 megabytes, unformatted, and
 5.24 megabytes to 20.97 megabytes, formatted. Access to data is
 provided by one moving head per disk durface. The heads are an
 integral part of the head disk assembly (HDA) and never require
 alignment in the field. Data is recorded on the disk surfaces using
 modified frequency modulation (MFM) techniques.


 Data access time
 ----------------
 Average latency                                     8.3 ms
 Average data access time/ramp mode                 98.3 ms
 Average data access time/3 milliseconds step mode 368.3 ms
 Head switching time                                 5 microsec. max.


 Illegal Address Map
 -------------------
 An illegal address map supplied with each drive informs the user of
 areas of defects. A media defect is a physical characteristic of the
 media which results in a repetitive read error when a properly
 adjusted unit is operated within the specific operating conditions.
 Valid data must not be written over known media defects; therefore,
 sector/track deallocation or other known media defects must be
 utilized to avoid these areas.

 A label fixed to each drive indicates the addresses of sectors which
 should be ignored by the host. These sector addresses are identified
 by cylinder, head, and sector. No illegal addresses exist in
 cylinders 0, 1, and 2. The format used for this purpose is 33 sectors
 per track, each sector consisting of 256 bytes.


 Indicators
 ----------
 When they are lit, the two red LEDs fixed to the master electronics
 board are visible through the facia. The Power On LED is located
 closest to the center of the facia and is on when the drive is Ready
 and no error is present. It is also used to indicate fault condi-
 tions in the drive.

 The Power On LED will not come on, indicating an error, if +5 volt
 supply does not come up and stabilize within one second.

 The Select LED comes on (provided the Power On LED is on) when
 the drive is ready and selected by the host.


 Power-Up Diagnostics
 --------------------
 During the power-up sequence in the drive, a number of automatic
 diagnostic routine sequences are performed before the drive becomes
 ready for system usage. When a fault error occurs, an appropriate
 error code is displayed in the fault indicators.

 The Power On LED is used to flash error messages when fault
 conditions occur in the drive. A 4-bit binary code is used (long
 flash = logic 1 and short flash = logic 0) with the most significant
 bit occuring first.

 Power-Up Sequence Error Codes
  +-----------+-----------------------------------------------+
  |Error Code |Error                                          |
  +-----------+-----------------------------------------------+
  |  1(0001)  |No index track data burst at track-2 or track-3|
  +-----------+-----------------------------------------------+
  |  2(0010)  |No flag 0 from track 0 detector                |
  +-----------+-----------------------------------------------+
  |  3(0011)  |Motor speed exceeds  1% tolerance              |
  +-----------+-----------------------------------------------+
  |  5(0101)  |Flag 0 always true                             |
  +-----------+-----------------------------------------------+
  |  9(1001)  |Microprocessor self-test failed                |
  +-----------+-----------------------------------------------+
  | 10(1010)  |No Index                                       |
  +-----------+-----------------------------------------------+
  | 11(1011)  |Motor not up to speed                          |
  +-----------+-----------------------------------------------+

 Operational Error Codes
  +-----------+------------------------------------------------------+
  |Error Code |Error                                                 |
  +-----------+------------------------------------------------------+
  |  4(0100)  |Motor speed exceeds +10%, -5% tolerance during normal |
  |           |operation.                                            |
  +-----------+------------------------------------------------------+
  |  6(0110)  |Step pulse while Write Gate is true                   |
  +-----------+------------------------------------------------------+
  |  7(0111)  |Static Write Fault condition:                         |
  |           +------------------------------------------------------+
  |           |1. Write current and no Write Gate, or                |
  |           +------------------------------------------------------+
  |           |2. No write current, no Write Gate, or                |
  |           +------------------------------------------------------+
  |           |3. More than one read/write head selected, or         |
  |           +------------------------------------------------------+
  |           |4. 12-volt supply below 10.3 volts, or                |
  |           +------------------------------------------------------+
  |           |5. 5-volt supply below 4.5 volts                      |
  +-----------+------------------------------------------------------+

 Media Defects
 -------------
 Model  7 = 2
 Model 13 = 4
 Model 20 = 6
 Model 27 = 8


