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# NCL AMERICA
NCL 5455, NCL 5456
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit, ISA |
|---------------+--------------------------------------------|
| Size: | Half-length, full-height card |
|---------------+--------------------------------------------|
| Hard drives | Two ST506/412 MFM drives |
| supported: | |
|---------------+--------------------------------------------|
| Floppy drives | NCL 5455: Two 360 KB, 720 KB, 1.2 MB or |
| supported: | 1.44 MB drives |
|---------------+--------------------------------------------|
| | NCL 5456: None |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| 34-pin control cable connector-hard drive | CN1 |
|------------------------------------------------------+-----|
| 20-pin data cable connector-drive 0 | CN2 |
|------------------------------------------------------+-----|
| 20-pin data cable connector-drive 1 | CN3 |
|------------------------------------------------------+-----|
| 34-pin data cable connector-floppy drive (NCL 5455 | CN4 |
| only) | |
|------------------------------------------------------+-----|
| 4-pin connector-drive active LED | CN5 |
|------------------------------------------------------+-----|
| 5-pin DC power connector | CN6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------------+----------+------------|
| » | Hard drive address is 1F0-1F7h | JP1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | Hard drive address is 170-177h | JP1 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+----------+------------|
| » | 32Kb ROM enabled | JP2 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | 16Kb ROM enabled | JP2 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|---------------------------------+-------------+------------|
| » | Floppy drive port address | JP7 | closed |
| | is 3F2-3F7h | | |
|---+-----------------------------+-------------+------------|
| | Floppy drive port address | JP7 | open |
| | is 372-377h | | |
|---+-----------------------------+-------------+------------|
| » | Cache enabled | JP11 | open |
|---+-----------------------------+-------------+------------|
| | Cache disabled | JP11 | closed |
|---+-----------------------------+-------------+------------|
| | 4Kb buffer enabled | JP12 | open |
|---+-----------------------------+-------------+------------|
| | 16Kb buffer enabled | JP12 | closed |
|---+-----------------------------+-------------+------------|
| | 4Kb buffer size selected | JP14, JP15, | pins 1 & 2 |
| | | JP16 | closed |
|---+-----------------------------+-------------+------------|
| | 16Kb buffer size selected | JP14, JP15, | pins 2 & 3 |
| | | JP15 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| All other jumpers are for factory tests and configured as |
| follows: JP4, JP5 - closed; JP6, JP8, JP13 - open; JP9, |
| JP10 - pins 2 & 3 closed - do not alter. |
+------------------------------------------------------------+