R O 7 5 2 A    RODIME

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                                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/HH              Cylinders     306|     |     |
Capacity form/unform    21/   25 MB        Heads           4|     |     |
Seek time   / track  85.0/18.0 ms          Sector/track   34|     |     |
Controller           SCSI1 SINGLE-ENDED    Precompensation
Cache/Buffer             4 KB FIFO BUFFER  Landing Zone
Data transfer rate    0.937 MB/S int       Bytes/Sector      512
                            MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |
Power: sleep              W     Humidity     %        10 85    |
       standby        9.0 W     Altitude    km                 |
       idle               W     Shock        g        10       |     30
       seek               W     Rotation   RPM      2746
       read/write         W     Acoustic   dBA
       spin-up            W     ECC        Bit   32
                                MTBF         h      12000
                                Warranty Month
Lift/Lock/Park     NO           Certificates


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                        L   A   Y   O   U   T
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RODIME   RO 650/750A  USER MANUAL P/N USM 00113

  +----------------------------------------------XXXXXXX----+
 ++ LED                                          1     4 P2 |
 ++                                                         |
  |                                                         |
  |                                                         6-5
  |                                                      S1 | |
  |                                                       ++2-1
  |                                                       |||XX S
  |                                                       |||XX C
  |                                                       ++|XX S
  |                                                       ++|XX I
  |                                             Terminator|||XX
  |                                             Packs     |||XX
  |                                                       ++|XX P1
  |                                                       ++|XX
  |                                                       |||XX
  |                                                       |||XX
  |                                                       ++|XX
  +---------------------------------------------------------+2 1



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
RODIME   RO650/750A  USER MANUAL P/N USM 00113

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

 x  = Factory setting


 S1  SCSI ID
 -----------
   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |       +-2--4--6-+
   |          |  1-2  |  3-4  |  5-6  |       | o  o  o |
   +----------+-------+-------+-------+       | o  o  o |
   | x  0     | OPEN  | OPEN  | OPEN  |       +-1--3--5-+
   |    1     | OPEN  | OPEN  | CLOSED|
   |    2     | OPEN  | CLOSED| OPEN  |
   |    3     | OPEN  | CLOSED| CLOSED|
   |    4     | CLOSED| OPEN  | OPEN  |
   |    5     | CLOSED| OPEN  | CLOSED|
   |    6     | CLOSED| CLOSED| OPEN  |
   |    7     | CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+


 DC Power and pin connector assignments
 --------------------------------------
 pin 1    +12 VDC
 pin 2    Ground
 pin 3    Ground
 pin 4    + 5 VDC



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                      I   N   S   T   A   L   L
**********************************************************************
RODIME   RO650/750A  USER MANUAL P/N USM 00113


 Drive Mounting RO 650A
 ----------------------
 A sub-frame with tapped holes is provided with each drive and permits
 base or side mounting. This frame is fixed to the module via shock
 absorbing mounts. The drive may be oriented in any axis. When
 installing the drive into an enclosure at least 0.1 inch clearance
 must be maintained around the entire drive to ensure vibration
 isolation, prevent obstruction of the breather filter and the
 creation of ground loops.

 Screw size for RO 650A drive mounting is 6-32 inch; 0.25 inch max.
 thread engagement depth.


 Mounting RO 750A
 ----------------
 The RO 750A consists of an RO 650A 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
 disk drive with the same tapped mounting holes.

 Screw size for RO 750A drive mounting is 6-32 UNC; 0.25 inch max.
 thread engagement depth.


 Multiple Drives
 ---------------
 Up to seven drives may be radially connected to a single host
 adapter. The adapter itself requires a unique SCSI address. RO 650A
 assignment is achieved by placing jumpers on the SCSI selector,
 designated S1. The drive is shipped with an SCSI address of 0 i.e.
 no jumpers are present.


 D.C. Power Connector
 --------------------
 DC power is provided by a four pin AMP Mate-N-Lok connector (P2/J2)
 part number 350211-1 mounted on the solder side of the board. The re-
 commended mating connector is AMP part number 1-480424-0 utilising
 AMP pins part number 350078-4.


 Interface Connector
 -------------------
 The RO 650A disk drive interface to a host adapter using a 50 pin,
 nonshielded flat ribbon connector. This connector is designated J1
 and connects to the drive via connector P1. The pins are numbered 1
 through 50. Pin 2 is located on the end of the board furthest from
 the DC power connector and is market. The recommended mating
 connector is 3M ribbon connector, P/N 3425-3000.


 Indicator
 ---------
 The drive has a single LED visible through the front facia,
 designated LED1. This LED will only be on when the drive is selected,
 otherwise it will be off. At the end of the power-up routine the LED
 will remain off.

 This LED is also used to flash fatal error messages should such fault
 conditions exists on the drive.


 Electrical Interface
 --------------------
 The basic operating configuration consists of a host computer, host
 adapter and the RO 650A disk drive. The host is a computer system,
 the host adapter is an interface between the host's bus and the disk
 drive.

 All signals are active low and use open collector drivers. The bus
 should be terminated at both ends with 220 ohms to +5V and 330 ohms
 to ground at each of the cable.


 Output Characteristics
 ----------------------
 Each signal driven by the RO 650A has the following output
 characteristics when measured at the drive's connector:

     Signal assertion               = 0.0 volts dc to 0.4 volts dc.

     Minimum driver output capacity = 48 milliamps (sinking) at 0.5
                                      volts dc.

     Signal negation                = 2.5 volts dc to 5.25 volts dc.


 Input Characteristics
 ---------------------
 Each signal received by the RO 650A shall have the following input
 characteristics when measured at the drive's connector:

     Signal true                    = 0.0 volts dc to 0.8 volts dc.

     Maximum toatl input load       = -0.4 milliamp at 0.4 volts dc.

     Signal false                   = 2.0 volts dc to 5.25 volts dc.

     Minimum input hysteresis       = 0.2 volts dc.


 Terminator Power (Optional)
 ---------------------------
 The RO 650A is configured to supply terminator power,(TERMPWR), with
 the following characteristics:

 VTERM = 4.0 volts dc to 5.25 volts dc.

 800 milliamps minimum source drive capability.

 1.0 milliamp maximum sink capability.


 Hardware Implementation
 -----------------------
 SCSI is implemented on a 50-way bus which has multiple, independent,
 interchangeable slots. The main advantage of a bus is that several
 tasks can be interleaved simultaneously on the bus. The RO 650A may
 operate in any of the configurations shown.

 Sample SCSI Configuration


            Host Adapter
   +--------+ |        +-----+ Single Initiator, Single Target
   |ComputerXXX--------+Drive|
   +--------+  SCSI Bus+-----RO 650A



   +--------+  SCSI    +-----+ Single Initiator, Multiple Target
   |ComputerXXX-----+--+Drive|
   +--------+| Bus  |  +-----RO 650A
           Host     |  +-----+
           Adapter  +--+Drive|
                       +-----RO 650A

         Host Adapter
             |
   +--------+| SCSI Bus+-----+ Multiple Initiator, Multiple Target
   |ComputerXXX-+---+--+Drive|  +
   +--------+   |   |  +-----+  |
   +--------+   |   |  +-----+  |
   |ComputerXXX-+   +--+Drive|  +
   +--------+|      |  +-----+  |
       Host Adapter |  +-----+  |
                    +--+Drive|  +----  RO 650A Intelligent Disk Drive
                    |  +-----+  |
                    |  +-----+  |
                    +--+Drive|  +
       Host Adapter |  +-----+  |
   +--------+|      |  +-----+  |
   |ComputerXXX-----+--+Drive|  +
   +--------+          +-----+


 Buffer Memory
 -------------
 A static 4K RAM data buffer is used as a first in first out (FIFO)
 circuit. This buffer i sused to enhance drive performance by storing
 blocks of data, thus allowing speed matching between the disk drive
 and the host.


 For convenience the default values set by Rodime are listed below:

 Format Parameters
 -----------------
 Sectors per track =  32
 Bytes per sector  = 532
 Interleave Factor =   2

 Geometry Parameters
 -------------------
 Number of cylinders = 306
 Number of heads     =   4