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Seagate ST02 SCSI Host-Adapter
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The ST02 Host Adpater support all Seagate SCSI interface hard drives.
The ST02 supports up to two 3,5-inch or 5,25-inch floppy disk drives.

Table 1: ST02 Diskette Support
--------------------------------------------------
I  Diskette  I  Capacity  I    Transfer Rate     I
I------------I------------I----------------------I
I   5,25"    I   360 kB   I     250 Kbits/sec    I
I   5,25"    I   1,2 MB   I 300/500 Kbits/sec    I
I   3,5"     I   720 kB   I     250 Kbits/sec    I
I   3,5"     I  1,44 MB   I 300/500 Kbits/sec    I
--------------------------------------------------

ST02 and SCSI Drive Configuration

SCSI Address/Parity Jumpers and Resistor Packs:
Set the SCSI ID Jumper on the hard disc drive. The Host-Adapter 
  recognizes devices by their SCSI ID number. If the drive has 
  parity jumpers, they must remain shorted.
If you are installing one drive, the ID number is 0 (no jumper)
A second physical drive must be set as ID number 1.

Drive Resistor Termination Packs:
If you are installing two drives, remove the resistor termination
packs from the first drive (the drive nearest the Host Adapter on
the cable).
  Remove the Host Adapter from the protective covering and pull
the rubber strips (if present) from between the connector pins. 
Observe static-discharge precautions and do not touch the board
components or connectors.

Starting BIOS Address:
C800Hex ist the 16K BIOS address (default). If there is a board
already installed at this address in the system, use the jumpers
to change to another address.

Zero-Wait-State (0WS):
A 2-pin jumper is provided to enable the 0WS logic for PC/ATs and
compatibles that implement the 0WS control line on the PC bus. The
default configuration disables the use of this line.
Optimum performance will be achieved on PC/AT compatibles, that
correctly implement this signal, by enabling this line.

Interrupt Selection
A 3-pin jumper is provided in order to select interrupts. Interrupts
should be disabled (by removing the jumper) for MS-DOS operating in
PC/XT/AT environments. This is the default configuration.

Diskette Drive Selection
The ST02 supports all four of the standard PC diskettes drive types.
A jumper is provided (JP5) to restrict diskette support to PC/XT
functionality; that is only 360kByte and 720kByte. The default 
setting (jumper on) will support all types. 

Register Emulation
Many personal computers that are compatible with the IBM PC/AT
check at boot time to verify that an AT-compatible diskette/hard
drive controller is present. If not, the an XT-compatible diskette
controller is assumed and only 360 KByte diskette drives are supported.
  A jumper is provided to enable emulation of this register (01F4H).
  The default is to enable emulation. In PC and PC/XT environments,
it is not used and may be safely left installed. It should be used in
PC/AT compatible systems; removing the jumper may prevent use of
1,2 MB and other (non-360 kB) format diskette drives.
  Emulation should be disabled if the system already has a hard disc
controller installed.

                                                     -----
                                                     I
     -------------------------------------------------
   -                1 ::::::::::::::::::::::::::     I
 /    1               J2 SCSI Connector              I
I=    ::                                             I
   I  ::          1 .... J7 LED                      I
I=    ::    P.                                       I
I=    ::    Q. JP6       ------                      I
I=    ::    R. Reg.Emul. I    I                      I
I=    ::                 I    I            JP2 ..    I
I=    ::        MNO      IbiosI            0WS       I
I=    ::    JP5 ...      I    I                      I
 \    Diskette           I    I                      I
   -                     ------           JP1        I
    I                   JP3 ...          A..C BIOS   I
    I             Interrupt EFG          B..D AddressI
   -                             --I-                I
 /                               --I-                I
I                                --I-                I
I                        J6 Power Connector          I
--------------                                  -----I
              \ IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII/     I
                                                     I

J6 Auxiliary Drive Power Connector:
A 5-pin DC power connector is provided for systems that lack drive
DC power cables. It may also be used for Drive-on-a-Card installations.
           --------  
 +12VDC  1 I o  o I 2  +12VDC
 + 5VDC  3 I o    I 4  not used
 ground  5 I o  o I 6  ground
           --------

LED Connector
A 4-pin header is provided for the drive front bezel LED connector 
used in PC/AT and compatible systems. Pins 1 and 4 are logic ground.
Pins 2 and 3 provice +5VDC when the SCSI channel is active.

16 K BIOS Memory Address (JP1)
------------------------------------
I  Configuration       I  Address  I
------------------------------------
I No Jumpers Installed I  C800 H   I
I Pins A-B Shorted     I INVALID ! I
I Pins C-D Shorted     I  CC00 H   I
I Pins A-B and C-D sh. I  DC00 H   I
------------------------------------

Zero-Wait-State-Enable (W2)
No Jumpers installed: 0WS Disable (Default)
Pins H-I shorted    : 0WS Enable

Interrupt Enable (J3)
No Jumpers installed: Interrupts Disabled (default)
Pins E-F shorted    : IRQ3 Enable
Pins F-G shorted    : IRQ5 Enable

Diskette Drive Type Selection (JP5)
Pins M-N shorted    : 360/720 kB only
Pins N-O shorted    : 360/720 and 1,2/1,44 (default)

Register 01F4 H Emulation (JP6)
Pins Q-R shorted    : Enabled for PC/XT 286 and PC/AT (default)
Pins P-Q shorted    : Disabled for PC/XT

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