                  MICROPOLIS 1936 DISK DRIVE
                        SPECIFICATIONS

                                       Model Number
Unformatted Capacity:                   1936-21 

Total Mbytes            --------------  3557 -----------------       
Disk Platters           ----------------- 11 -----------------       
Read/Write Heads        ----------------- 21 -----------------        
Cylinders               --------------- 2772 -----------------        
Bytes per track         ----------- VARIABLE -----------------

Formatted Capacity  

Total Mbytes            --------------- 3022 -----------------        
Bytes per Sector        ---------------- 512 -----------------        
Sectors per Track       ----------- VARIABLE -----------------

PC Setup

  When using SCSI in a PC, the most common method is to run your       
  setup program and define No Drives Present. The SCSI Host Adapter    
  will automatically self-configure on power-up. To install the        
  drive, follow the manufacturer's instructions to use the on-board    
  BIOS routine or software that was supplied with the Host Adapter.   

Performance Specifications  

  Seek Time                       Adjacent Track         2.0 msec
    (including settling time)     Average               11.5 msec
                                  Maximum                 25 msec

  Average Rotational Latency                            5.56 msec
  Rotational Speed                              5400 rpm +/- 0.5%

  Data Transfer Rate at Interface  
     Synchronous                              Up to 10 Mbytes/sec
     Asynchronous                             Up to  4 Mbytes/sec

  Internal Data Rate                                36 to 48 MHz

  MTBF                                              300,000 hours
  Positioner                     Fully balanced rotary voice coil
  Parking                                 Automatic park and lock

 General Functional Specifications  

  Interface                                           Fast SCSI-2
  Supports Full Common Command Set                            YES
  Mounting Plane                                  Any orientation

Power Requirements  

  +12V +/-5%                                           1.95A  Avg
                                      (4.35A max during start-up)
  +5V +/-5%                                              0.9A avg
 
  Power dissipation, typical                             30 Watts
 
 






7. Drive Addressing and Interface Termination


         ___________Slave sync(pin 20)
        |   ________Master sync(pin 16)
        |  |  ______Bus parity check option( 7th set of  pins) 
        |  | | _____Write protect option(6th set of pins)
        |  | || ____Spindle control option(4th set of pins)
        |  | ||| ___ID2    
        |  | |||| __ID1        
        |  | ||||| _ID0                    Pin 1  
        |  | ||||||                             |             
        ___________    __________________________     ________  
      _|    J2     |  |          J1              |   |   J3   |  
     | |___________|_ |__________________________|___|________|  
     |                 ___________    ___________             |
     |                |___________|  |___________|            |
     |                         RN4    RN5                     |
     |                                                 . W6   |
     |           W3 :  : W4                      W5 :  : W8   |
     |     Slave Sync  Master Sync         +5v to Bus   Term  |  
     |                                                  Power |
     |                                                        |  
     |                                               .. W7    |  
     |                                              Frame     |  
     |                                              Ground    |  
     |                                              Option    |
     |                                                        |
     |                                                        |  
 
 
ID0, ID1, ID2 SCSI Address Jumpers  
  The SCSI ID (drive address) jumpers are identified as ID0, ID1, 
  and ID2. ID selection is binary, as shown in the table below.  
 
   SCSI              Jumpers  
  Address        ID2   ID1   ID0  
  -------        ---   ---   ---  
     0           out   out   out  
     1           out   out    in  
     2           out    in   out  
     3           out    in    in  
     4            in   out   out  
     5            in   out    in  
     6            in    in   out  
     7            in    in    in  
  
  For multiple drive installations, on one Host Adapter, each drive 
  must have a unique address. Drives are configured as SCSI ID 7 
  at the factory.  
 
RN4 & RN5 Interface Terminators
  The Interface Terminator factory installed at RN6 provides     
  proper termination for the interface lines. When daisy-chaining  
  multiple drives, leave the terminator installed only in the last 
  physical drive (or drives) on the daisy chain cable; remove the 
  terminator from each of the other drives (or the host computer). 
 
Bus Termination Power Option  
  A jumper is installed at W6, at W8, or at W5 to select the   
  source of terminator power (+5V) for the SCSI Bus terminator packs on 
  the device electronics board.

  When a jumper is installed at W6 (the factory default configuration), 
  the drive provides terminator power to it's on-board terminators.

  When  a jumper is installed at W8 , terminator power is is provided by 
  the host system via the interface cable J1, pin 26 (TERMPWR).

  When a jumper is installl at both W8 and W5, the drive provides     
  terminator power to its on-board terminators and also to the SCSI bus 
  via interface cable J1,pin 26(TERMPWR).

Frame Ground Options  
  Jumper W7 selects the frame ground option.

  When W7 is installed, the drive's frame is connected to frame ground.

  When a jumper is not installed at W7 (the factory default
  configuration), frame ground is not connected to logic ground.

Spindle Control Options
  A jumper bridging pins 7 and 8 of J2 (the 4th set of pins)is used to 
  select the spindle control option.

  When a jumper is installed, the drive must wait for an interface Start 
  Unit command to start the spindle motor.

  When a jumper is not installed(the factory default configuration),   
  the drive automatically starts the spindle motor at power-on

Write Protect Option
  A jumper bridging pins 11 and 12 of J2 (the 6th set of pins) is used 
  to select the write protect option.

  When a jumper is installed, the drive is write protected. CAUTION: The 
  drive can still be formatted.

  When a jumper is not installed,(the factory default configuration),  
  the drive is not write protected.

Bus Parity Option
  A jumper bridging pins 13 and 14 of J2(7th set of pins) is used to   
  select the parity check option.

  When a jumper is not installed, (the factory default configuration), 
  the drive generates parity and enables parity detection.

  When a jumper is installed, the drive neither generates nor detects parity

Spindle Synchronization Option
  The Rotational Position Locking field(MODE SELECT command, Page Code 
  04h) is used to specify spindle synchronization operation; see       
  document #110366(Scsi Implementation in Micropolis "MZR" Products) and 
  ANSI SCSI Standard.

  Unsynchronized:If the drive is est to Unsynchronized(PRL=00b), it    
  ignores the SLAVE SYNC signal.

  Slave:If the drive is set to Slave(RPL=01b), it does not generate the 
  MASTER SYNC  signal or the SLAVE SYNC signal but synchronizes its    
  index to the SLAVE SYNC signal (J2,pin 20) supplied by an external   
  source

  Master:If the drive is set to MASTER(RPL=10b), it generates the SLAVE 
  SYNC output signal (j2,pin 20) for use directly by the slave drives.

  Master Control:If the drive is set to Master Control(RPL=11b), i     
  generates the MASTER SYNC signal(j2,pin 20). This output is used by  
  the controller to generate the SLAVE SYNC signal(J2,pin 20) for the  
  slave drives.
