DATUM, INC.
===========

   BC640AT TYMDIAL

   Category               PC Synchronization Clock                
   Data Bus Type          16-bit ISA                              
   Memory Type            Unidentified                            
   Maximum Onboard Memory Unidentified                            

<gopher://bitreich.org/I/th99/t/C-D/50665-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |    Purpose     |  Location   |    Purpose     |  Location  |
   |----------------+-------------+----------------+------------|
   | Line out       |     CN1     | Receive Line   |    CN3     |
   |----------------+-------------+----------------+------------|
   | Transmit Line  |     CN2     |                |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      INTERRUPT SELECT                      |
   |------------------------------------------------------------|
   | IRQ  | JP1/A  | JP1/B  | JP1/C  | JP1/D  | JP1/E  | JP1/F  |
   |------+--------+--------+--------+--------+--------+--------|
   | IRQ3 | Closed |  Open  |  Open  |  Open  |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | IRQ4 |  Open  | Closed |  Open  |  Open  |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | IRQ5 |  Open  |  Open  | Closed |  Open  |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | IRQ6 |  Open  |  Open  |  Open  | Closed |  Open  |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | IRQ7 |  Open  |  Open  |  Open  |  Open  | Closed |  Open  |
   |------+--------+--------+--------+--------+--------+--------|
   | IRQ9 |  Open  |  Open  |  Open  |  Open  |  Open  | Closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                INTERRUPT SELECT (CONTINUED)                |
   |------------------------------------------------------------|
   |  IRQ  | JP1/G  | JP1/H  | JP1/I  | JP1/J  | JP1/K  | JP1/L |
   |-------+--------+--------+--------+--------+--------+-------|
   | IRQ10 | Closed |  Open  |  Open  |  Open  |  Open  | Open  |
   |-------+--------+--------+--------+--------+--------+-------|
   | IRQ11 |  Open  | Closed |  Open  |  Open  |  Open  | Open  |
   |-------+--------+--------+--------+--------+--------+-------|
   | IRQ12 |  Open  |  Open  | Closed |  Open  |  Open  | Open  |
   |-------+--------+--------+--------+--------+--------+-------|
   | IRQ14 |  Open  |  Open  |  Open  | Closed |  Open  | Open  |
   |-------+--------+--------+--------+--------+--------+-------|
   | IRQ15 |  Open  |  Open  |  Open  |  Open  | Closed | Open  |
   |-------+--------+--------+--------+--------+--------+-------|
   | NONE  |  Open  |  Open  |  Open  |  Open  |  Open  |Closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 FACTORY CONFIGURED SETTING                 |
   |------------------------------------------------------------|
   |           Switch            |           Setting            |
   |-----------------------------+------------------------------|
   |            SW1/7            |              On              |
   |-----------------------------+------------------------------|
   |            SW1/8            |              On              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   ADDRESS CONFIGURATION                    |
   |------------------------------------------------------------|
   | Address | SW1/1  | SW1/2  | SW1/3  | SW1/4 | SW1/5 | SW1/6 |
   |---------+--------+--------+--------+-------+-------+-------|
   |  100h   |   On   |  Off   |   On   |  On   |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  110h   |   On   |  Off   |   On   |  On   |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  120h   |   On   |  Off   |   On   |  On   |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  130h   |   On   |  Off   |   On   |  On   |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  140h   |   On   |  Off   |   On   |  Off  |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  150h   |   On   |  Off   |   On   |  Off  |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  160h   |   On   |  Off   |   On   |  Off  |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  170h   |   On   |  Off   |   On   |  Off  |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  180h   |   On   |  Off   |  Off   |  On   |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  190h   |   On   |  Off   |  Off   |  On   |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  1A0h   |   On   |  Off   |  Off   |  On   |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  1B0h   |   On   |  Off   |  Off   |  On   |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  1C0h   |   On   |  Off   |  Off   |  Off  |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  1D0h   |   On   |  Off   |  Off   |  Off  |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  1E0h   |   On   |  Off   |  Off   |  Off  |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  1F0h   |   On   |  Off   |  Off   |  Off  |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  200h   |  Off   |   On   |   On   |  On   |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  210h   |  Off   |   On   |   On   |  On   |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  220h   |  Off   |   On   |   On   |  On   |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  230h   |  Off   |   On   |   On   |  On   |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  240h   |  Off   |   On   |   On   |  Off  |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  250h   |  Off   |   On   |   On   |  Off  |  On   |  Off  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   ADDRESS CONFIGURATION                    |
   |------------------------------------------------------------|
   | Address | SW1/1  | SW1/2  | SW1/3  | SW1/4 | SW1/5 | SW1/6 |
   |---------+--------+--------+--------+-------+-------+-------|
   |  260h   |  Off   |   On   |   On   |  Off  |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  270h   |  Off   |   On   |   On   |  Off  |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  280h   |  Off   |   On   |  Off   |  On   |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  290h   |  Off   |   On   |  Off   |  On   |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  2A0h   |  Off   |   On   |  Off   |  On   |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  2B0h   |  Off   |   On   |  Off   |  On   |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  2C0h   |  Off   |   On   |  Off   |  Off  |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  2D0h   |  Off   |   On   |  Off   |  Off  |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  2E0h   |  Off   |   On   |  Off   |  Off  |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  2F0h   |  Off   |   On   |  Off   |  Off  |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  300h   |  Off   |  Off   |   On   |  On   |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  310h   |  Off   |  Off   |   On   |  On   |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  320h   |  Off   |  Off   |   On   |  On   |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  330h   |  Off   |  Off   |   On   |  On   |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  340h   |  Off   |  Off   |   On   |  Off  |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  350h   |  Off   |  Off   |   On   |  Off  |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  360h   |  Off   |  Off   |   On   |  Off  |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  370h   |  Off   |  Off   |   On   |  Off  |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  380h   |  Off   |  Off   |  Off   |  On   |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  390h   |  Off   |  Off   |  Off   |  On   |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  3A0h   |  Off   |  Off   |  Off   |  On   |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  3B0h   |  Off   |  Off   |  Off   |  On   |  Off  |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  3C0h   |  Off   |  Off   |  Off   |  Off  |  On   |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  3D0h   |  Off   |  Off   |  Off   |  Off  |  On   |  Off  |
   |---------+--------+--------+--------+-------+-------+-------|
   |  3E0h   |  Off   |  Off   |  Off   |  Off  |  Off  |  On   |
   |---------+--------+--------+--------+-------+-------+-------|
   |  3F0h   |  Off   |  Off   |  Off   |  Off  |  Off  |  Off  |
   +------------------------------------------------------------+