NCL AMERICA
===========

   NCL 538B

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

   Data bus: 16-bit, ISA

   Size: Half-length, full-height card

   Hard drives supported:  Two AT Interface (IDE) drives

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

<gopher://bitreich.org/I/th99/c/M-O/20141-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                   Function                   |  Location   |
   |----------------------------------------------+-------------|
   | 34-pin control cable connector-floppy drive  |     CN3     |
   |----------------------------------------------+-------------|
   | 40-pin AT Interface (IDE) connector          |     CN4     |
   |----------------------------------------------+-------------|
   | 4-pin connector-drive active LED             |    CN10     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Location |  Setting   |
   |------------------------------------+----------+------------|
   |>> | DACK2 (Floppy drive DMA        |   JP1    | pins 1 & 2 |
   |   | Acknowledge) (hard-wired)      |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | DACK3 (Floppy drive DMA        |   JP1    | pins 2 & 3 |
   |   | Acknowledge)                   |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | IRQ6 (Floppy drive Interrupt   |   JP2    | pins 1 & 2 |
   |   | Request) (hard-wired)          |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | IRQ10 (Floppy drive Interrupt  |   JP2    | pins 2 & 3 |
   |   | Request)                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | IRQ14 (Hard drive Interrupt    |   JP3    | pins 1 & 2 |
   |   | Request)                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | IRQ15 (Hard drive Interrupt    |   JP3    | pins 2 & 3 |
   |   | Request)                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | DRQ2 (Floppy drive DMA         |   JP4    | pins 1 & 2 |
   |   | Request) (hard-wired)          |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | DRQ3 (Floppy drive DMA         |   JP4    | pins 2 & 3 |
   |   | Request)                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Hard drive port address is     |   JP6    |    open    |
   |   | 1FO-1F7h                       |          |            |
   |---+--------------------------------+----------+------------|
   |   | Hard drive port address is     |   JP6    |   closed   |
   |   | 17O-177h                       |          |            |
   |---+--------------------------------+----------+------------|
   |>> | Floppy drive port address is   |   JP7    |    open    |
   |   | 3F2-3F7h                       |          |            |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive port address is   |   JP7    |   closed   |
   |   | 372-377h                       |          |            |
   |---+--------------------------------+----------+------------|
   |>> | Normal operation               |   JP8    |    open    |
   |---+--------------------------------+----------+------------|
   |   | Diagnostic mode                |   JP8    |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Zero wait state disabled       |   JP9    |    open    |
   |---+--------------------------------+----------+------------|
   |   | Zero wait state enabled        |   JP9    |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | BIOS enabled                   |   JP11   |   closed   |
   |---+--------------------------------+----------+------------|
   |   | BIOS disabled                  |   JP11   |    open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BIOS ADDRESS                        |
   |------------------------------------------------------------|
   |      Address      |    Jumper JP5     |    Jumper JP5A     |
   |-------------------+-------------------+--------------------|
   |>> |     C800h     |       open        |        open        |
   |---+---------------+-------------------+--------------------|
   |   |     CC00h     |      closed       |        open        |
   |---+---------------+-------------------+--------------------|
   |   |     D800h     |       open        |       closed       |
   |---+---------------+-------------------+--------------------|
   |   |     DC00h     |      closed       |       closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |  Debug: G=C800:5 sets up custom parameters for IDE drives  |
   +------------------------------------------------------------+