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
**********************************************************************
L A Y O U T
**********************************************************************
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
+---------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
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|
+---------+------+------+------+------+
**********************************************************************
I N S T A L L
**********************************************************************
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.
**********************************************************************
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
