Seagate Technology, Inc.
Scotts Valley, CA

Specifications and jumper settings:

Older CDC/Imprimis Wren products NOT converted to new Seagate model
numbers (see the file OLD2NEW.TXT for conversion chart)

===========================================================================
9415-5 xx (Wren 1) ST506 MFM

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
9415-5 21  Wren1  ST412   697   3   17     35,547   18,200,064     0
9415-5 25  Wren1  ST412   697   4   17     47,396   24,266,752     0
9415-5 28  Wren1  ST412   697   4   17     47,396   24,266,752     0
9415-5 36  Wren1  ST412   697   5   17     59,245   30,333,440     0
9415-5 38  Wren1  ST412   733   5   17     62,305   31,900,160     0

      Drive Sel  Ŀ
      o o o o o     Term     1
      o o o o o   14 pin dip                        Ŀ
                                        O O O O  Power
      1 2 3 4 Radial                                  \/
                           Command Ŀ1  12 G G 5
      
         Data   Ŀ1  
      
                

===========================================================================
94151-xx (Wren 2) SCSI (SASI subset)

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94151-25   Wren2  SASI    921   3   36              n/a(256 byte/sct)
94151-27   Wren2  SASI    921   3   19              n/a(512 byte/sct)
94151-42   Wren2  SASI    921   5   36              n/a(256 byte/sct)
94151-44   Wren2  SASI    921   5   19              n/a(512 byte/sct)
94151-59   Wren2  SASI    921   7   36              n/a(256 byte/sct)
94151-62   Wren2  SASI    921   7   19              n/a(512 byte/sct)
94151-76   Wren2  SASI    921   9   36              n/a(256 byte/sct)
94151-80   Wren2  SASI    921   9   19              n/a(512 byte/sct)

           Drive Select ID
          
   Ŀ                                12GG5Ŀ 3 ea.Ŀ
 o o o o o o o o o   ͸   0 0 0 0  Terminator
 o o o o o o o o o   :::SCSI:Cable:::::::::::1  \/ 
S01234567

                                             Heads = 3   5   7   9
  Sector Block Size    ON = 512 bytes/block  94151-27, 44, 62, 80
                         OFF = 256 bytes/block  94151-25, 42, 59, 76

===========================================================================
94155-xxx (Wren 2) ST412 RLL

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94155-120  Wren2  ST412   960   8   26    199,680  102,236,160


   Drive Sel  Ŀ
   o o o o o     Term     1
   o o o o o   14 pin dip                        Ŀ
                                     O O O O  Power
   1 2 3 4 Radial                                  \/
                        Command Ŀ1  12 G G 5
   
      Data   Ŀ1  
   
             


===========================================================================
94155-xxx (Wren 2) ST412 MFM

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94155-36   Wren2  ST412   697   5   17     59,245   30,333,440    128
94155-48   Wren2  ST412   925   5   17     78,625   40,256,000     ?
94155-57   Wren2  ST412   925   6   17     94,350   48,307,200     ?
94155-67   Wren2  ST412   925   7   17    110,075   56,358,400     ?
94155-77   Wren2  ST412   925   8   17    125,800   64,409,600     ?

   Drive Sel  Ŀ
   o o o o o     Term     1
   o o o o o   14 pin dip                        Ŀ
                                     O O O O  Power
   1 2 3 4 Radial                                  \/
                        Command Ŀ1  12 G G 5
   
      Data   Ŀ1  
   
             


===========================================================================
94156-xx (Wren 2) ESDI (MFM Recordiing Mode)

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94156-48   Wren2  ESDI    925   5   17     78,625   40,256,000
94156-67   Wren2  ESDI    925   7   17    110,075   56,358,400
94156-86   Wren2  ESDI    925   9   17    141,525   72,460,800


Drive Selects Ŀ
 (binary)       Ŀ                    12 G G 5
            4 2 1       Term     1                   Ŀ
            o o o     14 pin dip   Command Cable     0 0 0 0  Power
            o o o    Ŀ1 \/
    
                      Ŀ1 
    
                      
                      Data Cable
                        Factory Test (off is normal)
                         Motor Start option enable
                                  Serial Mode (always on)
                          SW1    
             Sectors  1 2 3 4 5 6 7
           TMS
         (512) 17         1 1
               16         0 1             (located at front of drive
               34         1 0              behind the front plate)
               32         0 0
        Address Mark          1 1     1=on; 0=off
          Byte Clock          0 1
        Sector Pulse          0 0
        Sector Pulse          1 0


===========================================================================
94161-xxx (Wren 3) SCSI

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94161- 86  Wren3  SCSI    969   5   35    169,575   86,822,400
94161-101  Wren3  SCSI    969   5   34    164,730   84,341,760
94161-103  Wren3  SCSI    969   6   35    203,490  104,186,880
94161-121  Wren3  SCSI    969   7   35    237,405  121,551,360
94161-138  Wren3  SCSI    969   8   35    271,320  138,915,840
94161-141  Wren3  SCSI    969   7   34    230,622  118,078,464
94161-155  Wren3  SCSI    969   9   34    296,514  151,815,168

              (3 by 5 configuration jumper block)

       Motor Start Option enable (horizontal)
          N/A
               Terminator Power from Bus
     oo xx  oĳ  (upper 2 pins)               12GG5Ŀ Ŀ
     o o o o o  ͸   0 0 0 0  Terminator
     o o o o o   :::SCSI:Cable:::::::::::1  \/ 
421PT

        
             Terminator Power (+5v) from drive (lower 2 pins)
           Parity Check Option Enable (vertical)
        Drive Select ID's (vertical)



              (2 by 7 configuration jumper block)

Terminator Power from Bus (horizontal)
                                            12GG5Ŀ Ŀ
 o o o o o oo  ͸   0 0 0 0  Terminator
 o o o o o x o  :::SCSI:Cable:::::::::::1  \/ 
M421PTT

      
           Terminator Power (+5v) from drive (lower 2 pins)
        Parity Check Option Enable (vertical)
     Drive Select ID's (vertical)
  Motor Start Option enable


===========================================================================
94166-xxx (Wren 3) ESDI

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94166-101  Wren3  ESDI    969   5   36    174,420   89,303,040
94166-121  Wren3  ESDI    969   6   36    209,304  107,163,648
94166-141  Wren3  ESDI    969   7   36    244,188  125,024,256
94166-161  Wren3  ESDI    969   8   36    279,072  142,884,864

   Drive Selects   Ŀ                    12 G G 5
   1 2 3 4 5 6 7       Term     1                   Ŀ
   o o o o o o o     14 pin dip   Command Cable     0 0 0 0  Power
   o o o o o o o    Ŀ1 \/
   
                     Ŀ1 
   
                     
                      Data Cable

                        Motor Start option enable
                       
                       |  SW1   (located at front of drive behind the
    B/Sec   Sectors  1 2 3 4   front plate)
    M
    512       34       1 1 0   1=on; 0=off
    512       35       1 0 0
    512       36       0 1 0
    256       64       0 0 0
           Add Mark    1 1 1


===========================================================================
94171-xxx (Wren 4) SCSI

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94171-300  Wren4  SCSI   1412   9  ZBR    586,763  300,422,656
94171-307  Wren4  SCSI   1412   9  ZBR    586,763  300,422,656
94171-327  Wren4  SCSI   1412   9  ZBR    586,763  300,422,656
94171-344  Wren4  SCSI   1549   9  ZBR    631,016  323,080,192

Connects CHASIS ground to ground lug Ŀ
Connects SIGNAL ground to ground lug Ŀ 
                   Drive Select ID's Ŀ     
           Motor Start Option enable Ŀ       G G
          Parity Check Option enable Ŀ  Ŀ 12
                                      P M 4 2 1 oo   12GG5Ŀ
                                      o o o o o oo    0 0 0 0  Power
                                      o o o o o    \/
   ServoPWA

   DataPWA
    1    :::SCSI Cable::::::::::::1  Ŀ    1
Terminator DIP   ; o o    Terminator DIP
                                               oo
                                               
Terminator power (+5v) from drive (vertical) 
Terminator power from the Bus (lower horizontal)


===========================================================================
94186-xxx (Wren 5) FH ESDI

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94186-265  Wren5  ESDI   1412   9   36    457,488  234,233,856
94186-324  Wren5  ESDI   1412  11   36    559,152  286,285,824

       Data Cable              Controller Cable     /5GG12\
                         ͳ 0 0 0 0 
                o o o o o 1Ŀ o o o o o o o 
                o o o o o Terminator o o o o o o o
                1 2 3 4 5               7 6 5 4 3 2 1
  Motor Start                             Drive Selects
option enable         Factory use   Note:  There are 2 types of PWA's.
                        only          One with drive select header on the
       Sectors                        left, and one with header on the
                       right (like this). Pin positions
          64      0 0 0                  are the same.
          35      0 0 1
          10      0 1 0    0=open; 1=closed
          19      0 1 1
          36      1 0 0
          34      1 0 1
          87      1 1 0
    Add Mark      1 1 1


===========================================================================
94204-xx (Wren 2) HH AT

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94204-65   Wren2  AT      949   5

                           Master on /Slave off
                          
                             Factory    12GG5Ŀ Power
     AT Cable Connector      1  J2       0 0 0 0 
   1::::::::::::::::::   ::  :::::::::  \1234/
  
            pin-20 key     
                              For "non-C" model, jumper, if present,
                              must remain on. Drive will not operate
                           Ĵ properly if jumper is removed (or added
                               if not originally there).
                              
                               For "C" model, jumper on indicates No
                               Slave Present; jumper off means Slave
                               Drive Is Present.
                              


===========================================================================
94205-xx (Wren 2) HH ST412 MFM

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94205-30   Wren2  ST412   989   3   17     50,439   25,824,768
94205-41   Wren2  ST412   989   4   17     67,252   34,433,024
94205-53   Wren2  ST412  1024   5   17     87,040   44,564,480

  Drive Select                                     Ŀ
  o o o o o o o           1 Terminator              O O O O  Power
  o o o o o o o          Ŀ            \/
  1 2 3 4 R r reserved       1        12 G G 5
           
                         Controller Cable
         Radial
    If twisted cable, use Drive Select 2


===========================================================================
94211-xxx (Wren 3) SCSI

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94211-91   Wren3  SCSI    992   5

                                           4 2 1 P   12GG5Ŀ
  Ŀ  A B C D E F G H  o o o o    0 0 0 0  Power
  :SCSI:Cable::::pin 1  o o o o o o o o  o o o o   \1234/
 
                                                
      A-B Not used                               Parity check
      B-C Terminator power from Bus           Drive Select ID
      C-D Terminator power from Drive
      D-E Not used
      E-F Not used
      F-G Continuous test seeks
      G-H Motor Start option enable


===========================================================================
94221-xxx( Wren 5) HH SCSI

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94221-169  Wren5  SCSI   1310   5  ZBR    310,539  158,995,968
94221-184  Wren5  SCSI

                                                        Power
    SCSI Cable                             4 2 1 P   12GG5Ŀ
  ͸  A B C D E F G H  o o o o    0 0 0 0 
  :::::::::::::::::::1  o o o o o o o o  o o o o   \/
 PWA
                                                
      A-B Not used                               Parity check
      B-C Terminator power from Bus          
      C-D Terminator power from Drive         Drive Select ID
      D-E Not used                                  (ID 0 for single
      E-F Not used                                   drive system)
      F-G Continuous test seeks
      G-H Motor Start option enable


===========================================================================
94244-xxx (Wren 6) HH AT (IDE)

                  Inter-                 Total     Formatted
   Model   Family face   Cyl   Hd  SPT   Sectors    Capacity     WPC
----------|------|------|-----|---|-----|---------|-------------|----
94244-164  Wren6  AT     1747   3   54    283,014  144,903,168
94244-219  Wren6  AT     1747   4   54    377,352  193,204,224
94244-502  Wren6  AT

      Ŀ                          /\
   ͵1  AT (IDE) Cable   ͵O O O O
                o o o o o o o   
                                      o o o o o o o    5 G G 12
                                      G F E D C B A
A  B
0  0  Factory use only
0  1  Drive is Slave, motor start delay 20 sec from master start-up
1  0  Drive is Slave, no motor start delay
1  1  Drive is Master, motor starts at application of DC power
C  D
0  0  Physical mode
0  1  Translate (logical) mode, sparing scheme is one sector
1  0  Translate (logical) mode, no sparing space allocated
1  1  Factory use only
E
0     Slave present, only meaningful on master
1     No Slave present
F  G
x  x  Factory test, position G may or may not be present by PWA


===========================================================================
94246-xxx (Wren 6) HH ESDI


     Data Cable     Controller Cable               /4321\
             ͵0 0 0 0
               1Ŀ  o o o o o       o o o  
                 o o o o o       o o o   5 G G 12
                Terminator    5 4 3 2 1       4 2 1
                                          Drive Selects
   Motor Start option enable      Factory use only
                                  
          B/Sec  Sectors         
          
          256     96          0 0 0
          512     54          1 0 0  1=on, 0=off
          1024    15          0 1 0
                  Special     1 1 0
          512     53          0 0 1
          512     51          1 0 1
          1024    28          0 1 1
                  Add/Mark    1 1 1
