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# PC'S LIMITED, INC.
TURBO PC
Processor 8088-2
Processor Speed 7.33MHz
Chip Set None
Max. Onboard DRAM 640KB
Cache None
BIOS PC's Ltd.
Dimensions 355mm x 304mm
I/O Options None
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------+----------+------------------------+----------|
| Speaker | J2 | Reset switch | JP1 |
|-------------+----------+------------------------+----------|
| Turbo LED & | J3 | Alternate DC power | P3 |
| Power LED | | plug | |
|------------------------------------------------------------|
| Note:P3 may not be present on all boards. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| | Factory configured - do | J5 | Open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | CPU speed select fast | J6 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | CPU speed select slow | J6 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Self-test disabled | SW2/1 | On |
|---+---------------------------+---------------+------------|
| | Self-test enabled | SW2/1 | Off |
|---+---------------------------+---------------+------------|
| » | NPU disabled | SW2/2 | On |
|---+---------------------------+---------------+------------|
| | NPU enabled | SW2/2 | Off |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW2/4 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| | Color adjust | VC1 | Variable |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 256KB | (9) 41256 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 640KB | (9) 41256 | (9) 41256 | (18) 4164 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J4 |
|----------------------------+-------------------------------|
| 256KB | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 640KB | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size |SW2/3|SW3/1|SW3/2|SW3/3|SW3/4|SW3/5|SW3/6|SW3/7|SW3/8|
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
|256KB | On | On | Off | On | Off | On | Off | On | Off |
|------+-----+-----+-----+-----+-----+-----+-----+-----+-----|
|640KB | Off | Off | On | Off | On | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size |SW4/1 |SW4/2 |SW4/3 |SW4/4 |SW4/5 |SW4/6 |SW4/7|SW4/8|
|------+------+------+------+------+------+------+-----+-----|
|256KB | On | Off | On | Off | On | Off | On | Off |
|------+------+------+------+------+------+------+-----+-----|
|640KB | Off | On | Off | On | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Drives installed | SW2/7 | SW2/8 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | Off | On |
|--------------------+-------------------+-------------------|
| 3 | On | Off |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR CONFIGURATION |
|------------------------------------------------------------|
| Type | SW2/5 | SW2/6 |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
|--------------------+-------------------+-------------------|
| 40 x 25 color | Off | On |
|--------------------+-------------------+-------------------|
| 80 x 25 color | On | Off |
+------------------------------------------------------------+