NATURAL MICROSYSTEMS CORPORATION
================================

   VBX 1200

   Card Type         Telephony                                    
   Chip Set          TI 320C10                                    
   I/O options       MVIP bus                                     
   Data Bus          16-bit ISA                                   

<gopher://bitreich.org/I/th99/t/M-O/51962-1.png>
   

   Note: S1 is located on the back of the daughterboard.

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |   Function    | Label  |        Function        |  Label   |
   |---------------+--------+------------------------+----------|
   | MVIP bus      |  JP1   | Daughterboard headers  | JP3, JP4 |
   |------------------------------------------------------------|
   |      Note: Exact location of headers is unidentified.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                 Setting                 | Label | Position |
   |-----------------------------------------+-------+----------|
   |>> | Interrupt resistor enabled          | JP5/A |  Closed  |
   |---+-------------------------------------+-------+----------|
   |   | Interrupt resistor disabled         | JP5/A |   Open   |
   |---+-------------------------------------+-------+----------|
   |>> | Factory configured - do not alter   | S1/5  |   Off    |
   |---+-------------------------------------+-------+----------|
   |>> | Factory configured - do not alter   | S2/5  |   Off    |
   |------------------------------------------------------------|
   |      Note: If multiple boards are installed in a system,   |
   |      only one board should have JP5/A closed.              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               BASE I/O ADDRESS (MAIN BOARD)                |
   |------------------------------------------------------------|
   |    Setting    |   S2/1    |   S2/2   |   S2/3   |   S2/4   |
   |---------------+-----------+----------+----------+----------|
   |>> |   100h    |    On     |    On    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   140h    |    Off    |    On    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   180h    |    On     |   Off    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   280h    |    Off    |   Off    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   500h    |    On     |    On    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   540h    |    Off    |    On    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   580h    |    On     |   Off    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   680h    |    Off    |   Off    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   900h    |    On     |    On    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   940h    |    Off    |    On    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   980h    |    On     |   Off    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   A80h    |    Off    |   Off    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   D00h    |    On     |    On    |   Off    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   D40h    |    Off    |    On    |   Off    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   D80h    |    On     |   Off    |   Off    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   E80h    |    Off    |   Off    |   Off    |   Off    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              BASE I/O ADDRESS (DAUGHTERBOARD)              |
   |------------------------------------------------------------|
   |    Setting    |   S1/1    |   S1/2   |   S1/3   |   S1/4   |
   |---------------+-----------+----------+----------+----------|
   |   |   100h    |    On     |    On    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   140h    |    Off    |    On    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |>> |   180h    |    On     |   Off    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   280h    |    Off    |   Off    |    On    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   500h    |    On     |    On    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   540h    |    Off    |    On    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   580h    |    On     |   Off    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   680h    |    Off    |   Off    |   Off    |    On    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   900h    |    On     |    On    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   940h    |    Off    |    On    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   980h    |    On     |   Off    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   A80h    |    Off    |   Off    |    On    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   D00h    |    On     |    On    |   Off    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   D40h    |    Off    |    On    |   Off    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   D80h    |    On     |   Off    |   Off    |   Off    |
   |---+-----------+-----------+----------+----------+----------|
   |   |   E80h    |    Off    |   Off    |   Off    |   Off    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MVIP VOICE TRANSMISSION STREAM               |
   |------------------------------------------------------------|
   |    Setting     |  JP6/A   |  JP6/B   |  JP6/C   |  JP6/D   |
   |----------------+----------+----------+----------+----------|
   |   | Channel 0  |  Closed  |   Open   |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 2  |   Open   |  Closed  |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 4  |   Open   |   Open   |  Closed  |   Open   |
   |---+------------+----------+----------+----------+----------|
   |>> | Channel 6  |   Open   |   Open   |   Open   |  Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MVIP DATA TRANSMISSION STREAM                |
   |------------------------------------------------------------|
   |    Setting     |  JP6/E   |  JP6/F   |  JP6/G   |  JP6/H   |
   |----------------+----------+----------+----------+----------|
   |   | Channel 1  |  Closed  |   Open   |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 3  |   Open   |  Closed  |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 5  |   Open   |   Open   |  Closed  |   Open   |
   |---+------------+----------+----------+----------+----------|
   |>> | Channel 7  |   Open   |   Open   |   Open   |  Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 MVIP VOICE RECEIVE STREAM                  |
   |------------------------------------------------------------|
   |    Setting     |  JP9/A   |  JP9/B   |  JP9/C   |  JP9/D   |
   |----------------+----------+----------+----------+----------|
   |   | Channel 0  |  Closed  |   Open   |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 2  |   Open   |  Closed  |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 4  |   Open   |   Open   |  Closed  |   Open   |
   |---+------------+----------+----------+----------+----------|
   |>> | Channel 6  |   Open   |   Open   |   Open   |  Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  MVIP DATA RECEIVE STREAM                  |
   |------------------------------------------------------------|
   |    Setting     |  JP9/E   |  JP9/F   |  JP9/G   |  JP9/H   |
   |----------------+----------+----------+----------+----------|
   |   | Channel 1  |  Closed  |   Open   |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 3  |   Open   |  Closed  |   Open   |   Open   |
   |---+------------+----------+----------+----------+----------|
   |   | Channel 5  |   Open   |   Open   |  Closed  |   Open   |
   |---+------------+----------+----------+----------+----------|
   |>> | Channel 7  |   Open   |   Open   |   Open   |  Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 MVIP STREAMS (MAIN BOARD)                  |
   |------------------------------------------------------------|
   |      Setting      |    S2/6     |    S2/7     |    S2/8    |
   |-------------------+-------------+-------------+------------|
   |>> |      0-5      |     Off     |     Off     |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     6-11      |     On      |     Off     |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     12-17     |     Off     |     On      |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     18-23     |     On      |     On      |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     24-29     |     Off     |     Off     |     On     |
   |---+---------------+-------------+-------------+------------|
   |   |   Disabled    |     On      |     On      |     On     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                MVIP STREAMS (DAUGHTERBOARD)                |
   |------------------------------------------------------------|
   |      Setting      |    S1/6     |    S1/7     |    S1/8    |
   |-------------------+-------------+-------------+------------|
   |   |      0-5      |     Off     |     Off     |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     6-11      |     On      |     Off     |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     12-17     |     Off     |     On      |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |     18-23     |     On      |     On      |    Off     |
   |---+---------------+-------------+-------------+------------|
   |>> |     24-29     |     Off     |     Off     |     On     |
   |---+---------------+-------------+-------------+------------|
   |   |   Disabled    |     On      |     On      |     On     |
   +------------------------------------------------------------+

  +----------------------------------------------------------------+
  |                           INTERRUPT                            |
  |----------------------------------------------------------------|
  |Setting |JP5/B |JP5/C |JP5/D |JP5/E |JP5/F |JP5/G |JP5/H |JP5/I |
  |--------+------+------+------+------+------+------+------+------|
  |IR/FONT>| 0pen | 0pen | 0pen | 0pen |Closed| 0pen | 0pen | 0pen |
  |--------+------+------+------+------+------+------+------+------|
  |  IRQ3  |Closed| 0pen | 0pen | 0pen | 0pen | 0pen | 0pen | 0pen |
  |--------+------+------+------+------+------+------+------+------|
  |  IRQ4  | 0pen |Closed| 0pen | 0pen | 0pen | 0pen | 0pen | 0pen |
  |--------+------+------+------+------+------+------+------+------|
  |  IRQ5  | 0pen | 0pen |Closed| 0pen | 0pen | 0pen | 0pen | 0pen |
  |--------+------+------+------+------+------+------+------+------|
  |  IRQ7  | 0pen | 0pen | 0pen |Closed| 0pen | 0pen | 0pen | 0pen |
  |--------+------+------+------+------+------+------+------+------|
  | IRQ11  | 0pen | 0pen | 0pen | 0pen | 0pen |Closed| 0pen | 0pen |
  |--------+------+------+------+------+------+------+------+------|
  | IRQ12  | 0pen | 0pen | 0pen | 0pen | 0pen | 0pen |Closed| 0pen |
  |--------+------+------+------+------+------+------+------+------|
  | IRQ15  | 0pen | 0pen | 0pen | 0pen | 0pen | 0pen | 0pen |Closed|
  |----------------------------------------------------------------|
  |     Note: If multiple boards are installed in a system, assign |
  |     them all the same IRQ.                                     |
  +----------------------------------------------------------------+