Hard Drive: OLIVETTI: HD 662/12 20MB 5.25"/HH MFM ST506
H D 6 6 2 / 1 2 OLIVETTI
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/HH Cylinders 612| | |
Capacity form/unform 20/ 25 MB Heads 4| | |
Seek time / track 85.0/18.0 ms Sector/track 32| | |
Controller MFM / ST506 Precompensation
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 5 50 | -10 60
Power: sleep W Humidity % 10 80 | 10 95
standby W Altitude km |
idle W Shock g |
seek W Rotation RPM 3573
read/write W Acoustic dBA
spin-up W ECC Bit
MTBF h 12000
Warranty Month
Lift/Lock/Park YES Certificates
Jumpers
OLIVETTI HD662 PRELIMINARY DRIVE SPECIFICATIONS 11/84
Jumper Setting
==============
Drive Selection
---------------
When the drive select line is activated, drive selection will take
place. Only the drive with line active will respond to input lines or
gate output lines.
+---------+
| x . . . | ON
| . x x x | OFF
DS-1-2-3-4-+
+-+-+-+
|
+-------- Drive Select (set only one bit to ON)
Physical Interface
------------------
The electrical interface between the drive and the host system is
comprised of four connectors:
01J - provides control signals for the device (34 pins)
02J - provides the radial connection for read/write data signals
(20 pins)
03J - provides the dc power (4 pins)
Interface Lines and pin assignment ---------------------------------- Pin 1 +12V DC Pin 2 +12V Return Pin 3 +5V Return Pin 4 +5 V DC
01J Connector Pin Assignment ---------------------------- +------------+------------+---------------------------------+ |GND RTN PIN | Signal Pin | Signal Name | +------------+------------+---------------------------------+ | 1 | 2 | RESERVED | +------------+------------+---------------------------------+ | 3 | 4 | RESERVED | +------------+------------+---------------------------------+ | 5 | 6 | WRAGA - WRITE GATE | +------------+------------+---------------------------------+ | 7 | 8 | OCCUO - SEEK COMPLETE | +------------+------------+---------------------------------+ | 9 | 10 | POZEN - TRACK 000 | +------------+------------+---------------------------------+ | 11 | 12 | WRIFN - WRITE FAULT | +------------+------------+---------------------------------+ | 13 | 14 | HEAD1 - HEAD SELECT 2* | +------------+------------+---------------------------------+ | 15 | 16 | MACAN - RESERVED (TO 02J PIN 7) | +------------+------------+---------------------------------+ | 17 | 18 | HEAD2 - HEAD SELECT 2(1) | +------------+------------+---------------------------------+ | 19 | 20 | GIRON - INDEX | +------------+------------+---------------------------------+ | 21 | 22 | MADIN - READY | +------------+------------+---------------------------------+ | 23 | 24 | STEPN - STEP | +------------+------------+---------------------------------+ | 25 | 26 | SEL 1 - DRIVE SELECT 1 | +------------+------------+---------------------------------+ | 27 | 28 | SEL 2 - DRIVE SELECT 2 | +------------+------------+---------------------------------+ | 29 | 30 | SEL 3 - DRIVE SELECT 3 | +------------+------------+---------------------------------+ | 31 | 32 | SEL 4 - DRIVE SELECT 5 | +------------+------------+---------------------------------+ | 33 | 34 | AVANN - DIRECTION INN | +------------+------------+---------------------------------+
02J Connector Pin Assignment ---------------------------- +------------+----------+-----------------------------------+ |GND RTN PIN |SIGNAL PIN| SIGNAL NAME | +------------+----------+-----------------------------------+ | 2 | 1 | UNSEA - DRIVE SELECTED | +------------+----------+-----------------------------------+ | 4 | 3 | RISE1 - RESERVED | +------------+----------+-----------------------------------+ | 6 | 5 | RISE2 - RESERVED | +------------+----------+-----------------------------------+ | 8 | 7 | MACAN - RESERVED (TO 01J PIN 16) | +------------+----------+-----------------------------------+ | 10 | 9 | RISE3 - RESERVED | +------------+----------+-----------------------------------+ | 12 | 11 | GROUND - GND | +------------+----------+-----------------------------------+ | | 13 | WRIDO - +MFM WRITE DATA | +------------+----------+-----------------------------------+ | | 14 | WRIDN - -MFM WRITE DATA | +------------+----------+-----------------------------------+ | 16 | 15 | GROUND - GND | +------------+----------+-----------------------------------+ | | 17 | READO - +MFM READ DATA | +------------+----------+-----------------------------------+ | | 18 | READN - -MFM READ DATA | +------------+----------+-----------------------------------+ | 20 | 19 | GROUND - GND | +------------+----------+-----------------------------------+
Install
OLIVETTI HD662 PRELIMINARY SPECIFICATIONS 11/1984
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
UNACCEPTABLE! UNACCEPTABLE!
Never install PC board on the Top!
Positioning Mechanism
---------------------
The stepper motor positions the read/write heads.
The heads are mounted on a carriage driven by a stepper motor and
a capstan wound by a metal band. The winding and unwinding of the
metal band determine the positioning.
Drive Mechanism
---------------
A brushless DC spindle motor speeds up the disk until they reach 3573
revolutions per minute. Such speed is controlled by a locked-loop
circuit that has as reference a quartz frequency.
Heads and Disks
---------------
The read/write heads are of the Winchester type and fly at a height
of 0.4 m from the disk surface. The disks are made of aluminium
and the surface is coated with a sheet of ferrous oxide specially
lubricated to permit contact of the head with the surface during
start and stop phases.
Filters
-------
The drive has two filters:
An absolute filter mounted inside the cover to filter the air flow
generated by the disks rotation speed.
A compensation filter mounted on the cover to equalize pressure with
ambient air.
Connection Mode
---------------
The drives are connected in daisy chain on control signals and
radially on read/write signals. The maximum number of connected
drives is 4. The maximum lergth of the daisy connection cable is 6
meters (18 feet). Radial configuration cables must be the same
length as in daisy chain. In either case, the maximum length should
be no more than 6 meters.
There is also the possibility of a radial connection on the command
channel. When the jumper is set, all signal outputs are activated,
even when the unit is not selected.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXController/Data SeparatorXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
X X X X X
| | | | |
| | | | | +---------+
| | | | +--X 02J |
| | | | | 03JX-----Power Supply Unit
+--+--+--+-----X |
+--+--+--+-----X 01J |Drive 1
| | | | +---------+
| | | |
| | | | +---------+
| | | +-----X 02J |
| | | | 03JX-----Power Supply Unit
+--+--+--------X |
+--+--+--------X 01J |Drive 2
| | | +---------+
| | |
| | | +---------+
| | +--------X 02J |
| | | 03JX-----Power Supply Unit
+--+-----------X |
+--+-----------X 01J |Drive 3
| | +---------+
| |
| | +---------+
| +-----------X 02J |
| | 03JX-----Power Supply Unit
+--------------X |
X 01J |Drive 4
+---------+
Control Lines
-------------
All the following lines are present in the 01J connector. The
electrical specifications for these lines are as follows:
Low Level = 0.0 VDC to +0.4 VDC -48mA High Level = +2.5 VDC to +5.25VDC +250 A
Drive Select Lines
------------------
These lines when at a low level, permit the selection of the drives.
When selected, only one of these lines will be at a low level. The
peripheral remains selected when this line is kept at a low level.
No more than one line must be at low level.
The selection of the drive is made via dip switches mounted on the
PCB.
On a daisy chain configuration the resistors must be mounted only
on the last drive.
Cables
------
Connection with the 01J and 02J has to be made with a Flat Ribbon
cable or a Twisted Pair cable with a 105 ohm impedance.
Connection with the 03J has to be made with a Twisted Pair cable.
Features
OLIVETTI HD662 PRELIMINARY SPECIFICATIONS 11/1984
General Description
-------------------
The HD 662 is a random access magnetic storage unit with 2, 5.25 inch
diameter, non-removable disks.
The 4- head unit, mounted on a carriage driven by a stepper motor
with a band actuator, moves on disk surfaces and stops in any of the
612 cylinders. An appropriate area is used for the shipping zone.
The disks are mounted on a spindle fitted directly on the DC
brushless motor shaft.
The disks, heads and carriage are contained in a sealed chamber. This
chamber is made of a die-cast aluminium cup-shaped baseplate,
specially treated to prevent contamination, and its cover. Within
this chamber, the air blow through a class 100 absolute filter
recirculates in a contaminate-free environment.
On the outer side of the baseplate are mounted:
- the stepper motor - the spindle motor - the electronics is composed of: stepper motor drive circuits, actuation, data channel, spindle motor speed control, and a microprocessor to control the main functions.
The logical interface is industry standard and is composed of two
connectors. A standard connector is also used for DC voltage
requirements.
The physical interface is compatible with all 5.25 inch Winchester
drives with stepper motor actuator that use industry standard inter-
face.
Control lines from drive to controller
--------------------------------------
These lines are transmitted by a line driver with an open collector.
On the controller they have to be received by a Schmitt trigger
(74LS14 or equivalent).
Line impedance is terminated with a 220-330 ohm resistor pack.
Control lines from controller to drive
--------------------------------------
The lines are received by the drive with a 74LS14 Schmitt trigger and
the lines are terminated with a 220-330 ohm resistor pack.
On the controller they have to be transmitted by an open collector
75452-7438 or equivalent device.
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