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# 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 |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+