CORE INTERNATIONAL, INC.
========================

   CNT-AT2

   +------------------------------------------------------------+
   +------------------------------------------------------------+

   Data bus:  16 bit, ISA

   Size: Full-length, full-height card

   Hard drives supported: Two ESDI drives

   Floppy drives supported: Two 360 KB, 720 KB, 1.2 MB or 1.44 MB
   drives.

   Maximum heads/cyl.: 16 heads and 2048 cylinders

<gopher://bitreich.org/I/th99/c/C-D/20051-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                  |    Location    |
   |-------------------------------------------+----------------|
   | 34-pin data cable connector-floppy drive  |      CN1       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 1       |      CN3       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 0       |      CN4       |
   |-------------------------------------------+----------------|
   | 34-pin control cable connector-hard drive |      CN5       |
   |-------------------------------------------+----------------|
   | 4-pin connector-drive active LED          |      CN6       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   | Jumpers JP1, JP2, JP3, JP4, and JP7 are Factory configured |
   |                      - do not alter.                       |
   |                                                            |
   |           Jumper JP6, pins 2 & 3, are Not used.            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function             |  Location   |  Setting   |
   |---------------------------------+-------------+------------|
   |>> | Cache enabled               |    JP4A     |    open    |
   |---+-----------------------------+-------------+------------|
   |   | Cache disabled              |    JP4A     |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | 32KB data buffer            |     JP5     | pins 1 & 2 |
   |   | configuration               |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | 8KB data buffer             |     JP5     | pins 2 & 3 |
   |   | configuration               |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | 8/32KB data buffer          |     JP6     | pins 1 & 2 |
   |   | configuration               |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | Supports a third floppy     | JP11/jumper |    open    |
   |   | (DS2) on a twisted cable    |      1      |            |
   |---+-----------------------------+-------------+------------|
   |   | Supports a third floppy     | JP11/jumper |   closed   |
   |   | (DS4) on a straight cable   |      1      |            |
   |---+-----------------------------+-------------+------------|
   |>> | Floppy drive 1 is           | JP11/jumper |    open    |
   |   | configured as AT type.      |      2      |            |
   |---+-----------------------------+-------------+------------|
   |   | Floppy drive 1 is           | JP11/jumper |   closed   |
   |   | configured as PS/2 type.    |      2      |            |
   |---+-----------------------------+-------------+------------|
   |>> | Floppy drive 0 is           | JP11/jumper |    open    |
   |   | configured as AT type.      |      3      |            |
   |---+-----------------------------+-------------+------------|
   |   | Floppy drive 0 is           | JP11/jumper |   closed   |
   |   | configured as PS/2 type.    |      3      |            |
   |---+-----------------------------+-------------+------------|
   |>> | Floppy drive port address   | JP11/jumper |    open    |
   |   | 3F0-3F7h                    |      4      |            |
   |---+-----------------------------+-------------+------------|
   |   | Floppy drive port address   | JP11/jumper |   closed   |
   |   | 370-377h                    |      4      |            |
   |---+-----------------------------+-------------+------------|
   |>> | Single-speed floppy         | JP11/jumper |    open    |
   |   | supported                   |      5      |            |
   |---+-----------------------------+-------------+------------|
   |   | Dual-speed floppy supported | JP11/jumper |   closed   |
   |   |                             |      5      |            |
   |---+-----------------------------+-------------+------------|
   |>> | Floppy drive Precomp. is    | JP11/jumper |    open    |
   |   | scaled by data rate:        |      6      |            |
   |   |                             |             |            |
   |   | 500KHz=125ns, 300KHz=208ns, |             |            |
   |   | 250KHz=250ns                |             |            |
   |---+-----------------------------+-------------+------------|
   |   | Precomp. fixed at 125ns for | JP11/jumper |   closed   |
   |   | all data rates.             |      6      |            |
   |---+-----------------------------+-------------+------------|
   |>> | Hard drive port address     |    JP12     |    open    |
   |   | 1F0-1F7h                    |             |            |
   |---+-----------------------------+-------------+------------|
   |   | Hard drive port address     |    JP12     |   closed   |
   |   | 170-177h                    |             |            |
   |---+-----------------------------+-------------+------------|
   |>> | Chassis ground is connected |    JP16     |   closed   |
   |   | to logic ground             |             |            |
   |---+-----------------------------+-------------+------------|
   |   | Chassis ground is not       |    JP16     |    open    |
   |   | connected to logic ground   |             |            |
   |---+-----------------------------+-------------+------------|
   |>> | Floppy controller enabled   |    JP17     |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | Floppy controller disabled  |    JP17     |    open    |
   |---+-----------------------------+-------------+------------|
   |>> | Hard Drive Interrupt is     |    JP20     | pins 2 & 3 |
   |   | IRQ14                       |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | Hard Drive Interrupt is     |    JP20     | pins 1 & 2 |
   |   | IRQ15                       |             |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BIOS ADDRESS                        |
   |------------------------------------------------------------|
   |   Address    | JP10/jumper 1 | JP10/jumper  | JP10/jumper  |
   |              |               |      2       |      3       |
   |--------------+---------------+--------------+--------------|
   |   | Disabled |     open      |     open     |     open     |
   |---+----------+---------------+--------------+--------------|
   |>> |  C800h   |     open      |     open     |    closed    |
   |---+----------+---------------+--------------+--------------|
   |   |  CC00h   |     open      |    closed    |     open     |
   |---+----------+---------------+--------------+--------------|
   |   |  D000h   |     open      |    closed    |    closed    |
   |---+----------+---------------+--------------+--------------|
   |   |  D400h   |    closed     |     open     |     open     |
   |---+----------+---------------+--------------+--------------|
   |   |  D800h   |    closed     |     open     |    closed    |
   |---+----------+---------------+--------------+--------------|
   |   |  DC00h   |    closed     |    closed    |     open     |
   |---+----------+---------------+--------------+--------------|
   |   | Disabled |    closed     |    closed    |    closed    |
   +------------------------------------------------------------+