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# UNIDENTIFIED
12MHZ TURBO XT MAINBOARD
Processor 8088
Processor Speed 12MHz
Chip Set Unidentified
Max. Onboard DRAM 640KB
Cache None
BIOS Unidentified
Dimensions 220mm x 220mm
I/O Options None
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------+----------+---------------------+----------|
| Power LED | CN3 | Power LED & keylock | CN6 |
|----------------+----------+---------------------+----------|
| Reset switch | CN4 | Turbo LED | CN7 |
|----------------+----------+---------------------+----------|
| Speaker | CN5 | Turbo switch | CN8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|---------------------------------+---------------+----------|
| » | Memory wait state select 0 | J6 | Open |
| | wait states | | |
|---+-----------------------------+---------------+----------|
| | Memory wait state select 1 | J6 | Closed |
| | wait state | | |
|---+-----------------------------+---------------+----------|
| » | Parity check disabled | SW/1 | On |
|---+-----------------------------+---------------+----------|
| | Parity check enabled | SW/1 | Off |
|---+-----------------------------+---------------+----------|
| » | Factory configured - do not | SW/2 | On |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|-------+----------------------+--------------+--------------|
| 256KB | (2) 414256 & (1) | NONE | NONE |
| | 41256 | | |
|-------+----------------------+--------------+--------------|
| 512KB | (2) 414256 & (1) | (2) 414256 & | NONE |
| | 41256 | (1) 41256 | |
|-------+----------------------+--------------+--------------|
| 640KB | (2) 414256 & (1) | (2) 414256 & | (2) 414256 & |
| | 41256 | (1) 41256 | (1) 41256 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW/3 | SW/4 |
|--------------------+-------------------+-------------------|
| 256KB | Off | On |
|--------------------+-------------------+-------------------|
| 512KB | On | Off |
|--------------------+-------------------+-------------------|
| 640KB | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR DISPLAY CONFIGURATION |
|------------------------------------------------------------|
| Display | SW/5 | SW/6 |
|--------------------+-------------------+-------------------|
| Color (40 x 25) | Off | On |
|--------------------+-------------------+-------------------|
| Color (80 x 25) | On | Off |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Drives installed | SW/7 | SW/8 |
|--------------------+-------------------+-------------------|
| 1 | On | On |
|--------------------+-------------------+-------------------|
| 2 | Off | On |
|--------------------+-------------------+-------------------|
| 3 | On | Off |
|--------------------+-------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+