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Hard Drive: RODIME: RO252 10MB 5.25"/HH MFM ST506




R O 2 5 2    RODIME
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     306|     |     |
Capacity form/unform    10/      MB        Heads           4|     |     |
Seek time   / track  85.0/18.0 ms          Sector/track   32|     |     |
Controller           MFM / ST506           Precompensation   128
Cache/Buffer               KB              Landing Zone      305
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    |
Power: sleep              W     Humidity     %        10 85    |
       standby            W     Altitude    km                 |
       idle               W     Shock        g         3       |     30
       seek               W     Rotation   RPM      3600
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit
                                MTBF         h      12000
                                Warranty Month
Lift/Lock/Park     NO           Certificates                                  

Layout

RODIME RO 350 SERIES USER MANUAL P/N USM0040

                                                    XXXXXXX P3 Power
  +---------------------------------------------------------+
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX P2
  |                                                         |XX Data
  |                                                         |XX
  |                                                         |XX
  |                                                         |
  |                                      Drive  +-+P4       |XX P1
  |                                      Select | |         |XX
  |                                             1-+     ++  |XX C
  |                                          Terminator ||  |XX O
  |                                          Resistor   ||  |XX N
  |                                          Pack       ||  |XX T
  |                                                     ||  |XX R
  |                                                     ++  |XX O
  |                                                         |X1 L
  +---------------------------------------------------------+

Jumpers

RODIME RO 350 SERIES USER MANUAL P/N USM0040

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

Drive Select
------------
Up to four drives may be connected to one host in a "daisy-chain"
fashion. Drive numbering is effected by pins P4 which are shorted
together by means of the jumper provided. To identify a drive as
number 1, short the pins furthest from the DC connector. Similarly
for drives 2, 3 and 4. All "daisy-chained" drives should have the
line terminator pack removed except for the last drive in the chain.
All drives are supplied for single usage, that is, pole 1 is closed
and the terminator pack is present.

        +------+------+------+------+------+
        |Drive |Pole  |Pole  |Pole  |Pole  |
        |Select|  1   |  2   |  3   |  4   |
        +------+------+------+------+------+
        |  1   |CLOSED|OPEN  |OPEN  |OPEN  |
        +------+------+------+------+------+
        |  2   |OPEN  |CLOSED|OPEN  |OPEN  |
        +------+------+------+------+------+
        |  3   |OPEN  |OPEN  |CLOSED|OPEN  |
        +------+------+------+------+------+
        |  4   |OPEN  |OPEN  |OPEM  |CLOSED|
        +------+------+------+------+------+

 P3   DC Power and pin connector assignments
 -------------------------------------------
      +------------+   pin 1    +12 VDC
      | 4  3  2  1 |   pin 2    +12 Volts Return
      +------------+   pin 3    + 5 Volts Return
                       pin 4    + 5 VDC

Install

RODIME RO 350 SERIES USER MANUAL P/N USM0040

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

Side brackets with tapped holes (6/32" UNC) are provided with each
drive and permits base or side mounting. These brackets are fixed to
the drive frame via shock-absorbing mounts. The drive MAY 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 and to prevent obstruction of the breather filter
and the creation of ground loops.

The RO250 consits of a RO350 module and sub-frame which is attached
to additional side brackets. The complete assembly meets the form
factor requirements of a "half-height" 5.25 inch Winchester with the
same tapped mounting holes.

Up to four drives may be connected to one host in a "daisy-chain"
fashion.

Note that, in the multiple drive configuration all data interface
lines are radially connected to the host.

Connectors
----------
The RO 350 drive interfaces to host systems via a variant the ST506
interface which has become an accepted standard for 5 inch
Winchester disc drives. There are separate connectors for data (MFM
code), for control lines and for DC power. A chassis ground tab is
also provided. The convention for control is that a TTL logical zero
is false and a TTL logical one is false. Up to four drives may be
connected to a host system and each drive is provided with a four-
pole switch for selection. The control lines may be daisy-chained but
the data lines MUST be radially (individually) connected to the host.

Control signals for the drive are provided via the 34 pin edge
connector (P1/J1). The pins are numbered 1 through 34 with the even
pins located on the solder side of the board. Pin 2 is located on
the end of the board connector closest to the DC power connector and
is labelled. A key slot is provided between pins 4 and 6. The
recommended mating connector is AMP ribbon connector A/N 88373-3.

Radial connection of read/write data signals is provided via a 20 pin
edge connector (P2/J2). The pins are numbered 1 through 20 with the
even pins located on the solder side of the board. The recommended
mating connector is AMP ribbon connector A/N 88373-6.

DC power is provided via a 4 pin AMP Mate-N-Lok connector (P7/J7)
P/N 350211-1, or equivalent, mounted via the solder side of the
board. The recommended mating connector is AMP P/N 1-480424-0
utilising AMP pins P/N 350078-4.

System with four drives
-----------------------

       HOST
   +-----------+                                +-----------------+
   |           +---o---Control------------------+J1     Drive 1   |
   |           |   |    +-------Data------------+J2               |
   |           |   |    |             +-Power---+J3               |
   |           |   |    |             |         +-----------------+
   |           |   |    |             |         +-----------------+
   |Controller |   o----+-------------+---------+J1     Drive 2   |
   |           |   |    | +-----------+---------+J2               |
   |           |   |    | |           o---------+J3               |
   |           |   |    | |           |         +-----------------+
   |           |   |    | |           |         +-----------------+
   +-----------+   o----+-+-----------+---------+J1     Drive 3   |
   |           |   |    | | +---------+---------+J2               |
   |           +---+----+ | |         o---------+J3               |
   |           +---+------+ |         |         +-----------------+
   |Data       +---+--------+         |         +-----------------+
   |Separator  |   +------------------+---------+J1     Drive 4   |
   |           +----------------------+---------+J2               |
   |           |                      o---------+J3               |
   +-----------+                      |         +-----------------+
                       DC voltages----+

Note that, in the multiple drive configuration all data interface
lines are radially connected to the host.

Controllers
-----------
The following 5-1/4 inch Winchester Disk Controllers are known to
operate with the RO350 series disk drive. In general, any controller
which will operate with the RO100 and RO200 series disk drive will
also operate with the RO350 series disk drive. However, the
controller must be able to address up to 306 cylinders and set the
STEP interval in the range 5 s to 15ms.

Features

RODIME RO 350 SERIES USER MANUAL P/N USM0040

Introduction
------------
The Rodime RO 350 series of 3.5 inch (96 mm) Winchster disk drives
provides fast access data storage for use with small business
computers, terminal and microprocessor based systems. There are two
models in the series, RO 351 and RO352. This manual also covers the
RO 251 and RO252 which consist of the RO350 with additional mounting
brackets and separate facia which simulates a half high 5.25 inch
form factor.

 Seek Time
 ---------
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |  18    |
       +----------------------------------+--------+
       |Average                msec. typ. |  85    |
       |                       msec. max. | 180    |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.3  |
       +----------------------------------+--------+

Indicator and Fault Codes
-------------------------
Two red LED's fixed to the master electronics board are visible
through the facia when they are illuminated.

The "Power-On" LED is on when the drive is READY with no error
condition present. It is also used to indicate fault conditions to
the driev.

The "Select" LED is on when the drice is selected by the host
provided the "Power-On" LED is on.

The "Power-On" LED is positioned closest to the centre of the facia.
It is used to flash error messages should certain fault conditions
arise on the drive. A four bit binary code is used (long flash =
logical 1, short flash = logical 0) with the most significant bit
occurring first:

e.g. Short, short, long, short = 2 (0010)

    +------------+--------------------------------------------------+
    | Fault Code | Description                                      |
    +------------+--------------------------------------------------+
    | 01 (0001)  | No index track data burst                        |
    +------------+--------------------------------------------------+
    | 02 (0010)  | No Flag zero                                     |
    +------------+--------------------------------------------------+
    | 03 (0011)  | Motor speed outside +/- 1% tolerance at end of   |
    |            | power-up sequence                                |
    +------------+--------------------------------------------------+
    | 04 (0100)  | Motor speed outside +10%, tolerance in normal    |
    |            | operation                                        |
    +------------+--------------------------------------------------+
    | 05 (0101)  | Flag zero stays TRUE                             |
    +------------+--------------------------------------------------+
    | 06 (0110)  | STEP received while WRITE GATE is TRUE           |
    +------------+--------------------------------------------------+
    | 07 (0111)  | WRITE FAULT                                      |
    +------------+--------------------------------------------------+
    | 08 (1000)  | Microprocessor self-test fail (RAM)              |
    +------------+--------------------------------------------------+
    | 09 (1001)  | Microprocessor self-test fail (ROM)              |
    +------------+--------------------------------------------------+
    | 10 (1010)  | No INDEX                                         |
    +------------+--------------------------------------------------+
    | 11 (1011)  | Motor not up to speed                            |
    +------------+--------------------------------------------------+

Fault codes 1, 2, 3, 5, 8, 9, 10 and 11 are monitored during the
initial power-up sequence of the drive. The remaining codes, namely
4, 6 and 7 are constantly monitored during normal operation. All
fault codes are latched by the processor and the drive must be
restarted to clear.

Illegal Address Map
-------------------
Each drive is accompanied by a map indicating the addresses of
sectors which should not be used by the host. This map (label) is
fixed to the base casting wall. These illegal sectors have been
identified during unit test in the factory and contain a repeatable
disk defect, greater than one bit in length. No such illegal address
will exist in cylinders 0, 1 and 2.

An illegal address is specified by cylinder, head and sector. It
should be noted that the format used for this purpose is 33 sectors
of 256 bytes each. The maximum number of illegal addresses is:

Model Number 351 352
Max. number of illegal addresses 4 8













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