M 8 0 5 1 S MINISCRIBE
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/HH Cylinders 739| | |
Capacity form/unform 41/ 51 MB Heads 4| | |
Seek time / track 30.0/ 8.0 ms Sector/track 28| | |
Controller SCSI1 SINGLE-ENDED Precompensation
Cache/Buffer 1 KB DUAL-PORTED Landing Zone
Data transfer rate 1.000 MB/S int Bytes/Sector 512
MB/S ext
Recording method RLL 2/7 operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 4 50 | -40 65
Power: sleep W Humidity % 8 80 | 8 80
standby W Altitude km -0.061 3.048| 12.192
idle 8.0 W Shock g 10 | 40
seek W Rotation RPM 3484
read/write W Acoustic dBA 45
spin-up W ECC Bit 32
MTBF h 30000
Warranty Month
Lift/Lock/Park YES Certificates CSA,FCC,IEC380,TUV,UL478,VDE
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L A Y O U T
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MINISC. 8051S PRODUCT MANUAL REV. P4
+---------------------------------------------------------+
| 1---J4 1---J5 ++|XXI
| +---+ +---+ |||XXN
| |||XXT
| RP3++|XXE
| ++|XXR
| |||XXF
| |||XXA
| RP2++|XXC
| ++|XXE
| |||XX
| |||XX
| RP1++|XX
| |
| |XXPower
| |XXJ3
+---------------------------------------------------------+
+----------------------------------+
| |
| |
+----------------------------------+
|+---------- - - - - -----1+ |
||::::::::::::--+-1-:::::::+-----1++
|+--SCSI------ -|X|- - ----+XXXXXX||
| +-+ +Power-+|
+-- LED --+
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J U M P E R S
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MINISC. 8051S PRODUCT MANUAL REV. P4
Jumper Setting
==============
J4 Addressing
-------------
1-+-+-+
+-+-+-+
| | +-- SEL 0
| +---- SEL 1
+------ SEL 2
+----------+-----------------------+
| SCSI ID | Jumpers | Address selection on
| | SEL2 | SEL1 | SEL0 | the 8051S drive is
+----------+-------+-------+-------+ accomplished by the
| 0 | OPEN | OPEN | OPEN | use of three jumpers
| 1 | OPEN | OPEN | CLOSED| at J4:
| 2 | OPEN | CLOSED| OPEN | SEL 0 (LSB)
| 3 | OPEN | CLOSED| CLOSED| SEL 1
| 4 | CLOSED| OPEN | OPEN | SEL 2 (MSB)
| 5 | CLOSED| OPEN | CLOSED|
| 6 | CLOSED| CLOSED| OPEN |
| 7 | CLOSED| CLOSED| CLOSED|
+----------+-------+-------+-------+
Communication on the SCSI bus is allowed between only two (2) devices
at any given time. There is a maximum of eight (8) SCSI devices. Each
SCSI device has a SCSI ID bit assigned. When two (2) SCSI devices
communicate on the SCSI bus one acts as an initiator and the other as
a target. The initiator originates and operation and the target per-
forms the operation. An initiator may address up to eight (8) logical
units (LUN) attached to one target. The 8051S drive has only one
logical unit attached (LUN = 0).
J5 Mode Jumpers
----------------
1-+-+-+
+-+-+-+
| | +-- E
| +---- D
+------ Disable Parity
Disable Parity CLOSED = disabled
J5-E Invokes Offline Diagnostics Following Reset, which consits of
infinite seek tests (random or oscillating).
J5-D Diagnostic mode (Internal use only).
Diagnostic and Exercise Routines
--------------------------------
The microprocessor performs a series of "wake up" diagnostics upon
application of power. If an error is detected, the processor will
flash a warning by blinking the Activity LED. Some errors are fatal
in that they do not return to the program until power is cycled.
If no errors are detected, the processor tests Jumper E to determine
its state (open or closed). Briefly, Jumper E (Drive Exercise
Options) is as follows:
The jumper is left open for normal (online) operations. It is also
used to run burn-in code. If the jumper is closed, (and left closed)
the normal burn-in (oscillating seeks) program will be run. If this
jumper is closed and opening during the code level display, the
random seek routine is run.
Power-up sequence is as follows:
1. Apply power.
2. The microprocessor runs power on diagnostics.
3. Test Jumper E. If open, go to normal operation. If closed,
continue to Step 4.
4. Diagnostic Mode Routine.
Get here if diagnostic Jumper E is installed at powerup time. This
routine flashes the revision level in the LED. A delay of 1 1/4
seconds is the followed by a delay of 4 seconds with the LED on.
The diagnostic Jumper E is checked following these delays and
saved for future use. A recal is then done, and a seek to the
maximum cylinder. A code of '1' is then flashed. A seek to
cylinder zero is done and the LED is then turned on and remains
on. If an error was detected during the recal or these two seeks,
the routine hangs with error code 'D' being flashed. If no error
was detected, the LED remains on and the routine performs either
random seeks (Jumper E was removed during above delays) or
oscillating seeks (Jumper E remained on during above delays). If
an error is detected during the oscillating or random seeks, an
error code of 'D'is flashed, and the routine restarts at the recal
described.
Code Definition
0 Interface Processor RAM Check/Servo Processor RAM Check
1 Interface Processor ROM Check/Data Sequencer Check
2 Interface Chip Diagnostic Failure
3 Not Used
4 Servo Processor Not Ready
5 Spin Speed Out of Range
6 Recal Failure/Hard Reset Failure/Spin up Check
7 Servo Sync Check
8 Mismatched Interface-Servo Processor Firmware Levels
9 Servo Track Follow Lost
A Servo Processor RAM Check/Servo Demod Chip Failure
B Servo Processor Failure
C Interface to Servo Processor Command Timeout Failure
D Seek or Recal Failure
E Servo Processor Lost Hall Transitions
F Unexpected Interrupt from Processor
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I N S T A L L
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MINISC. 8051S PRODUCT MANUAL REVISION P4
Notes of installation
=====================
Drive Orientation
-----------------
The drive may be mounted in any attitude.
Mounting Configuration
----------------------
The Miniscribe 8051S quarter size drives are designed to be used in
applications where the unit may experience shock and vibration at
greater levels than larger and heavier disk drives.
Two features which allow greater shock tolerance are the rugged media
and shock mounts. To take full advantage of the shock mounts,
however, it is necessary to provide a minimum of 0.1 inch clearence
on both the top and sides of the drive. This clearence allows for
movement of the drive during acceleration.
The drive is mounted using 6-32 screws, 1/8 inch maximum penetration.
The customer should allow adequate ventilation for the drive to en-
sure reliable drive operation over the operating temperature range.
Mechanically isolated mounting points
-------------------------------------
Four (4) side mounting and four (4) base mounting points are
provided to the customer. Each mounting point is mechanically isola-
ted from the head-disk assembly.
SCSI Connector
--------------
A 50 pin flat ribbon connector is provided at J1. The 3M P/N
3425-3000 cable connector is recommended. All signals are low true
and all odd pins are tied to Ground (except pin 25).
TermPower (Pin 26) is +5 volts thru a 1 amp microfuse. Loss of this
fuse will result in the disks drive appearing dead. RESERVING the
connector with pin 25 grounded will cause this fuse blow.
J3 DC Power Connector
---------------------
DC power connector (P3) is a 4 pin AMP Mate-N-Lok Connector, mounted
on the PCB.
The recommended mating connector (J3) is AMP P/N 1-480424-0 utilizing
AMP pins P/N 350078-4.
+------------+ 1 = +12 Volts DC
| 4 3 2 1 | 2 = +12 Volts Ground Return
+------------+ 3 = + 5 Volts Ground Return
4 = + 5 Volts DC
Electrical Interface
--------------------
SCSI uses single-ended drivers and receivers which allow a maximum
cable length of 20 feet (6 meters) from the first to the last
device (up to 8 devices) on the bus.
All assigned signals are terminated with 220 ohms to +5 volts and
330 ohms to ground at each end of the cable. All three (3) terminator
networks on the 8051S are removable.
All signals driven by the drive are open collector and have the
output characteristics as follows.
Signal Assertion 0.0 VDC to 0.8 VDC
Max. Driver Output 48mA (sinking) at 0.5 VDC
Signal Negation 2.5 to 5.25 VDC
All signals received by the drive shall have the following input
characteristics.
Signal True 0.0 V DC to 0.8 V DC
Maximum Total Input Load -0.4 mA @ 0.4 V DC
Signal False 2.5 to 5.25 V DC
Minimum Input Hyteresis 0.2 V DC
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F E A T U R E S
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MINISC. 8051S PRODUCT MANUAL REVISION P4
Introduction
------------
The MiniScribe 8051S (Small Computer System Interface - ANSI
X3.131-1986) series of 3 1/2 inch disk drives are half height random
access storage devices of 42 Megabytes of formatted data (51 MB un-
formatted) containing 2 plated disks and utilizing Winchester style
flexure technology.
High performance and high unit reliability are achieved by the
utilization of a proven microprocessor spin control and rack-and-
pinion stepper mechanism. The heads, disks and actuator assemblies
are within a sealed enclosure containing recirculating and breather
filters to supply clean air and equalized pressure to the head and
disk environment. Quality mechanical construction with a sophistica-
ted single printed circuit board allows for maintenance-free
operation throughout the life of the drive.
The 8051S series disk drive uses the industry standard Small
Computer System Interface (SCSI) compatible interface capable of up
to 1 Megabyte/second (8 megabits/second) data transfer rate. The
drive also features power up, user invoked or offline diagnostics and
has full support of disconnection. Defect handling is entirely
transparent to the host system as well as seek retry and error
correction. The 8051S uses imbedded servo technology.
The unit size and shock mounting are identical to the industry
standard half height 3 1/2 mini floppy mounting dimensions and it
uses the same power connector.
Seek Time
---------
+----------------------------------+--------+
| | 8051S |
+----------------------------------+--------+
|Track-to-Track msec. typ. | 8 |
+----------------------------------+--------+
|Average msec. typ. | <30 |
| msec. max. | <60 |
+----------------------------------+--------+
|Latency msec. avg. | 8.61 |
+----------------------------------+--------+
Media Defect Criteria
---------------------
All defects are preassigned from the factory.
Host Interface and Data Buffer
------------------------------
The host interface and data buffer are integrated in one single
semicustom circuit with the following features:
ANSI X3.131-1986 compatible (SCSI) Host interface operating in Target
mode only.
Capable of Arbitration and disconnection.
Parity generation and checking (user selectable).
Dual ported 1024 bytes buffer.
Read/Write Electronics
----------------------
One integrated circuit is mounted within the sealed enclosure in
close proximity to the read/write heads. Its function is to provide
one (1) of four (4) head selection, read preamplification and write
drive circuitry.
Drive Mechanism
---------------
A brushless DC direct drive motor rotates the spindle at 3484 RPM.
The motor/spindle assembly is dynamically balanced to provide minimal
mechanical runout to the disks. A dynamic brake is used to provide a
fast stop to the spindle motor when power is removed.
Air Filtration System
---------------------
Within the sealed enclosure, a 0.3 micron filter, coupled with a
breather filter, provides over the drive life a clean, above
atmospheric pressure environment to the heads and disks.
Head Positioning System
-----------------------
The position of four (4) read/write heads are controlled by a moving
magnet rotary actuator.
Caution/Warning
---------------
The Miniscribe drive is a precision product. During handling the unit
must not be dropped, jarred or bumped. Otherwise, damage to the heads
and disks may occur. When the drive is removed from the Miniscribe
shipping container and not immediately secured within a chassis
through its shock mounts, it must be stored on a padded, grounded,
antistatic surface.
Failure to comply with the above procedure will render null and void
all warranties.
