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# NORTHGATE COMPUTER SYSTEMS, INC.
MB108
+------------------------------------------------------------+
|------------------------------------------------------------|
| 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 - (reserved for | J1 |
| future use) | |
|-------------------------------------------------+----------|
| 34-pin control cable connector - floppy drive | J2 |
|-------------------------------------------------+----------|
| 4-pin connector - Drive active LED | J3 |
|-------------------------------------------------+----------|
| 40-pin IDE(AT) Interface connector | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|---------------------------------------+----------+---------|
| » | Hard drive Interrupt Request | W21 | closed |
| | IRQ14 enabled | | |
|---+-----------------------------------+----------+---------|
| | Hard drive Interrupt Request | W21 | open |
| | IRQ14 disabled | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HARD DRIVE PORT ADDRESS |
|------------------------------------------------------------|
| Function | SW1/jumper 1 | SW1/jumper 2 |
|------------------------------+--------------+--------------|
| » | Hard drive port address | closed | open |
| | is 1F0-1F7h | | |
|---+--------------------------+--------------+--------------|
| | Hard drive port address | open | closed |
| | is 170-177h | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE PORT ADDRESS |
|------------------------------------------------------------|
| Function | SW1/jumper 1 | SW1/jumper 2 |
|------------------------------+--------------+--------------|
| » | Floppy drive port | closed | open |
| | address is 3F0-3F7h | | |
|---+--------------------------+--------------+--------------|
| | Floppy drive port | open | closed |
| | address is 370-377h | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| Jumpers J4 (Drive-type 300Kb/sec) is factory configured to |
| pins 2 & 3 closed - do not alter |
| |
| J5 (Pump/Precomp) is factory configured to pins 1 & 2 |
| closed - do not alter. |
+------------------------------------------------------------+