PROMISE TECHNOLOGY, INC.
========================

   DC420

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:         | 32-bit, VL-bus                         |
   |-------------------+----------------------------------------|
   | Size:             | Three/quarter-length, full-height card |
   |-------------------+----------------------------------------|
   | Hard drive        | Two IDE (AT) interface drives          |
   | supported:        |                                        |
   |-------------------+----------------------------------------|
   | Floppy drives     | Two 360KB, 720KB, 1.2MB or 1.44MB      |
   | supported:        | drives                                 |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/P-R/20574-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                   Function                    |  Location  |
   |-----------------------------------------------+------------|
   | 25-pin parallel port - external               |    CN1     |
   |-----------------------------------------------+------------|
   | 9-pin serial port 1 - external                |    CN2     |
   |-----------------------------------------------+------------|
   | 10-pin serial port 2 - internal               |    CN3     |
   |-----------------------------------------------+------------|
   | 34-pin control cable connector - floppy drive |     J1     |
   |-----------------------------------------------+------------|
   | 40-pin IDE (AT) Interface connector           |     J3     |
   |-----------------------------------------------+------------|
   | 4-pin connector - drive active LED            |    JP3     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Location |  Setting   |
   |------------------------------------+----------+------------|
   |>> | Main board supports VL-bus ID3 |   JP1    | pins 1 & 2 |
   |   | (speed < 50MHz)                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Main board does not support    |   JP1    | pins 2 & 3 |
   |   | VL-bus ID3 (speed > 50MHz)     |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Factory configured - do not    |   JP2    | pins 1 & 2 |
   |   | alter                          |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Floppy drive enabled           |  JP4/G   | pins 1 & 2 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive disabled          |  JP4/G   | pins 2 & 3 |
   |   |                                |          |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 1 (CN2) CONFIGURATION              |
   |------------------------------------------------------------|
   |  COM/Address/IRQ   |       JP4/A       |       JP4/B       |
   |--------------------+-------------------+-------------------|
   |>> | COM1/3F8h/IRQ4 | pins 1 & 2 closed | pins 2 & 3 closed |
   |---+----------------+-------------------+-------------------|
   |   | COM3/3E8h/IRQ4 | pins 2 & 3 closed | pins 1 & 2 closed |
   |---+----------------+-------------------+-------------------|
   |   |    Disabled    | pins 2 & 3 closed | pins 2 & 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 2 (CN3) CONFIGURATION              |
   |------------------------------------------------------------|
   |  COM/Address/IRQ   |       JP4/C       |       JP4/D       |
   |--------------------+-------------------+-------------------|
   |>> | COM2/2F8h/IRQ3 | pins 1 & 2 closed | pins 2 & 3 closed |
   |---+----------------+-------------------+-------------------|
   |   | COM4/2E8h/IRQ3 | pins 2 & 3 closed | pins 1 & 2 closed |
   |---+----------------+-------------------+-------------------|
   |   |    Disabled    | pins 2 & 3 closed | pins 2 & 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             PARALLEL PORT (CN1) CONFIGURATION              |
   |------------------------------------------------------------|
   |  Address/IRQ  |      JP4/E       |   JP4/F    |   JP4/H    |
   |---------------+------------------+------------+------------|
   |>> | 378h/IRQ7 | pin 1 & 2 closed | pins 2 & 3 | pins 2 & 3 |
   |   |           |                  |   closed   |   closed   |
   |---+-----------+------------------+------------+------------|
   |   | 3BCh/IRQ7 |    pins 1 & 2    | pins 1 & 2 | pins 2 & 3 |
   |   |           |      closed      |   closed   |   closed   |
   |---+-----------+------------------+------------+------------|
   |   | 278h/IRQ5 |    pins 2 & 3    | pins 1 & 2 | pins 1 & 2 |
   |   |           |      closed      |   closed   |   closed   |
   |---+-----------+------------------+------------+------------|
   |   | Disabled  |    pins 2 & 3    | pins 2 & 3 |  all pins  |
   |   |           |      closed      |   closed   |    open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |           PARALLEL PORT BI-DIRECTIONAL FUNCTION            |
   |------------------------------------------------------------|
   |            Setting            |            JP5             |
   |-------------------------------+----------------------------|
   |        Bi-directional         |            open            |
   |-------------------------------+----------------------------|
   |        Uni-directional        |           closed           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    MEMORY CONFIGURATION                    |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |>> |    512KB     |    (1) 512K x 8    |        None        |
   |---+--------------+--------------------+--------------------|
   |   |     1MB      |    (1) 512K x 8    |    (4) 256K x 4    |
   +------------------------------------------------------------+