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# NORTHGATE COMPUTER SYSTEMS, INC.
SLIMLINE CACHE 25/33
Processor 80386DX
Processor Speed 25/33MHz
Chip Set OPTI
Max. Onboard 16MB
DRAM
Cache 64/256KB
BIOS AMI
Dimensions 350mm x 304mm
I/O Options Floppy drive interface, IDE interface,
parallel port, serial ports (2), VGA port
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| VGA port | J1 | Serial port 2 | J10 |
|-------------------+----------+------------------+----------|
| Turbo LED | J3 | Parallel port | J15 |
|-------------------+----------+------------------+----------|
| Power LED & | J4 | Floppy drive | J16 |
| keylock | | interface | |
|-------------------+----------+------------------+----------|
| Speaker | J5 | IDE interface | J17 |
|-------------------+----------+------------------+----------|
| Reset switch | J6 | Riser card | R1 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J8 | Turbo switch | W6 |
|-------------------+----------+------------------+----------|
| Serial port 1 | J9 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------+------------+------------|
| » | Floppy drive interface | SW2/pins | Closed |
| | interrupt (IRQ6) enabled | 11 & 12 | |
|---+------------------------------+------------+------------|
| | Floppy drive interface | SW2/pins | Open |
| | interrupt (IRQ6) disabled | 11 & 12 | |
|---+------------------------------+------------+------------|
| » | Floppy drive interface | SW2/pins | Closed |
| | DMARQ2 enabled | 13 & 14 | |
|---+------------------------------+------------+------------|
| | Floppy drive interface | SW2/pins | Open |
| | DMARQ2 disabled | 13 & 14 | |
|---+------------------------------+------------+------------|
| » | Floppy drive interface DACK2 | SW2/pins | Closed |
| | enabled | 15 & 16 | |
|---+------------------------------+------------+------------|
| | Floppy drive interface DACK2 | SW2/pins | Open |
| | disabled | 15 & 16 | |
|---+------------------------------+------------+------------|
| » | Floppy drive interface | SW3/pins 1 | Closed |
| | enabled | & 2 | |
|---+------------------------------+------------+------------|
| | Floppy drive interface | SW3/pins 1 | Open |
| | disabled | & 2 | |
|---+------------------------------+------------+------------|
| » | Factory configured - do not | W1 | Open |
| | alter | | |
|---+------------------------------+------------+------------|
| » | Cache enabled | W4 | Closed |
|---+------------------------------+------------+------------|
| | Cache disabled | W4 | Open |
|---+------------------------------+------------+------------|
| » | BIOS type select 27512 | W5 | pins 2 & 3 |
| | | | closed |
|---+------------------------------+------------+------------|
| | BIOS type select 27256 | W5 | pins 1 & 2 |
| | | | closed |
|---+------------------------------+------------+------------|
| » | Monitor type select | W7 | pins 1 & 2 |
| | monochrome | | closed |
|---+------------------------------+------------+------------|
| | Monitor type select color | W7 | pins 2 & 3 |
| | | | closed |
|---+------------------------------+------------+------------|
| » | Parallel port mode select | W13 | pins 2 & 3 |
| | input only | | closed |
|---+------------------------------+------------+------------|
| | Parallel port mode select | W13 | pins 1 & 2 |
| | bi-directional | | closed |
|---+------------------------------+------------+------------|
| » | Floppy drive precompensation | W17 | pins 2 & 3 |
| | select standard | | closed |
|---+------------------------------+------------+------------|
| | Floppy drive precompensation | W17 | pins 1 & 2 |
| | select alternate | | closed |
|---+------------------------------+------------+------------|
| » | Floppy drive mode select | W18 | pins 1 & 2 |
| | single speed | | closed |
|---+------------------------------+------------+------------|
| | Floppy drive mode select | W18 | pins 2 & 3 |
| | dual speed | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (PAL CHIP "A" INSTALLED AT U44) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION (PAL CHIP "A" INSTALLED AT U44) |
|------------------------------------------------------------|
| Size | W8 | W9 | W10 | W11 | SW1 |
|------+-------+-------+-------+-------+---------------------|
| 1MB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2, 5 & 6, 7 & |
| | | | | | 8, 9 & 10 |
|------+-------+-------+-------+-------+---------------------|
| 2MB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2, 5 & 6, 7 & 8 |
|------+-------+-------+-------+-------+---------------------|
| 4MB | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 7 & 8, 9 & 10 |
|------+-------+-------+-------+-------+---------------------|
| 8MB | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 7 & 8 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (PAL CHIP "B" INSTALLED AT U44) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION (PAL CHIP "B" INSTALLED AT U44) |
|------------------------------------------------------------|
| Size | W8 | W9 | W10 | W11 | SW1 |
|-------+--------+-------+-------+-------+-------------------|
| 4MB | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 7 & 8, 9 & 10 |
|-------+--------+-------+-------+-------+-------------------|
| 8MB | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 7 & 8 |
|-------+--------+-------+-------+-------+-------------------|
| 16MB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 5 & 6, 7 & 8, 9 & |
| | | | | | 10 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 64KB | (10) 8K x 8 |
|----------------------------+-------------------------------|
| 256KB | (10) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | W2 | W3 |
|------------+-----------------------+-----------------------|
| 64KB | pins 1 & 2 closed | pins 1 & 2 closed |
|------------+-----------------------+-----------------------|
| 256KB | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| IDE CONFIGURATION |
|------------------------------------------------------------|
| Setting | W20 | W21 |
|--------------------+-------------------+-------------------|
| Enabled | Open | Closed |
|--------------------+-------------------+-------------------|
| Disabled | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT ADDRESS CONFIGURATION |
|------------------------------------------------------------|
| Address | SW3 |
|----------------------------+-------------------------------|
| 378h | Open |
|----------------------------+-------------------------------|
| 3BCh | pins 11 & 12 closed |
|----------------------------+-------------------------------|
| 278h | pins 9 & 10 closed |
|----------------------------+-------------------------------|
| Disabled | pins 9 & 10, 11 & 12 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ | SW2 |
|----------------------------+-------------------------------|
| IRQ7 | pins 9 & 10 closed |
|----------------------------+-------------------------------|
| IRQ5 | pins 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 CONFIGURATION |
|------------------------------------------------------------|
| Setting | SW2 | SW3 |
|------------------+--------------------+--------------------|
| Enabled | pins 5 & 6 closed | Open |
|------------------+--------------------+--------------------|
| Disabled | Open | pins 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 CONFIGURATION |
|------------------------------------------------------------|
| Setting | SW2 | SW3 |
|------------------+--------------------+--------------------|
| Enabled | pins 3 & 4 closed | Open |
|------------------+--------------------+--------------------|
| Disabled | Open | pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO CONFIGURATION |
|------------------------------------------------------------|
| Setting | SW5 |
|--------------------------+---------------------------------|
| Enabled | pins 1 & 2, 3 & 4, 5 & 6 closed |
|--------------------------+---------------------------------|
| Disabled | pins 7 & 8 closed |
+------------------------------------------------------------+