NATIONAL COMPUTERS, LTD. (NCL AMERICA)
======================================

   NCL DB825

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:         | 16-bit, ISA                            |
   |-------------------+----------------------------------------|
   | Size:             | Half-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/M-O/20386-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                   Function                    |  Location  |
   |-----------------------------------------------+------------|
   | 34-pin control cable connector - floppy drive |     J3     |
   |-----------------------------------------------+------------|
   | 40-pin 3 1/2" IDE(AT) Interface connector     |     J4     |
   |-----------------------------------------------+------------|
   | 44-pin 2 1/2" IDE(AT) Interface connector     |     J5     |
   |-----------------------------------------------+------------|
   | 4-pin connector - Drive active LED            |    JP10    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Location |  Setting   |
   |------------------------------------+----------+------------|
   |>> | Floppy drive DMA Acknowledge   |   JP1    | pins 1 & 2 |
   |   | is DACK2                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive DMA Acknowledge   |   JP1    | pins 2 & 3 |
   |   | is DACK3                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Interrupt Request is IRQ6      |   JP2    | pins 1 & 2 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Interrupt Request is IRQ10     |   JP2    | pins 2 & 3 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Hard drive Interrupt Request   |   JP3    | pins 1 & 2 |
   |   | is IRQ14                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Hard drive Interrupt Request   |   JP3    | pins 2 & 3 |
   |   | is IRQ15                       |          |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Location |  Setting   |
   |------------------------------------+----------+------------|
   |>> | Floppy drive DMA Request is    |   JP4    | pins 1 & 2 |
   |   | DREQ2                          |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive DMA Request is    |   JP4    | pins 2 & 3 |
   |   | DREQ3                          |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Hard drive port address is     |   JP6    |    open    |
   |   | 1F0-1F7h                       |          |            |
   |---+--------------------------------+----------+------------|
   |   | Hard drive port address is     |   JP6    |   closed   |
   |   | 170-177h                       |          |            |
   |---+--------------------------------+----------+------------|
   |>> | Floppy drive port address is   |   JP7    |    open    |
   |   | 3F2-3F7h                       |          |            |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive port address is   |   JP7    |   closed   |
   |   | 372-377h                       |          |            |
   |---+--------------------------------+----------+------------|
   |>> | Normal operation enabled       |   JP8    |    open    |
   |---+--------------------------------+----------+------------|
   |   | Diagnostic mode enabled        |   JP8    |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | I/O Channel Ready signal       |   JP9    |    open    |
   |   | disabled                       |          |            |
   |---+--------------------------------+----------+------------|
   |   | I/O Channel Ready signal       |   JP9    |   closed   |
   |   | enabled                        |          |            |
   |---+--------------------------------+----------+------------|
   |>> | BIOS enabled                   |   JP11   |   closed   |
   |---+--------------------------------+----------+------------|
   |   | BIOS disabled                  |   JP11   |    open    |
   |---+--------------------------------+----------+------------|
   |>> | Primary BIOS mode enabled      |   JP12   |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Co-existing BIOS mode enabled  |   JP12   |    open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BIOS ADDRESS                        |
   |------------------------------------------------------------|
   |     Address      |    JP5/jumper 1    |    JP5/jumper 2    |
   |------------------+--------------------+--------------------|
   |>> |    C800h     |        open        |        open        |
   |---+--------------+--------------------+--------------------|
   |   |    CC00h     |       closed       |        open        |
   |---+--------------+--------------------+--------------------|
   |   |    D800h     |        open        |       closed       |
   |---+--------------+--------------------+--------------------|
   |   |    DC00h     |       closed       |       closed       |
   +------------------------------------------------------------+