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# AMERICAN RESEARCH CORPORATION
X TURBO
Processor 8088
Processor Speed 4/6MHz
Chip Set Unidentified
Max. Onboard DRAM 640KB
Cache None
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options Proprietary slots (2)
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|-------------------------------+----------------------------|
| Proprietary slots | SL1 - SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|----------------------------------+-----------+-------------|
| » | Turbo enabled | SW2/1 | Off |
|---+------------------------------+-----------+-------------|
| | Turbo disabled | SW2/1 | On |
|---+------------------------------+-----------+-------------|
| » | NPU disabled | SW2/2 | On |
|---+------------------------------+-----------+-------------|
| | NPU enabled | SW2/2 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|---------+------------+------------+------------+-----------|
| 64KB | (9) 4164 | NONE | NONE | NONE |
|---------+------------+------------+------------+-----------|
| 128KB | (9) 4164 | (9) 4164 | NONE | NONE |
|---------+------------+------------+------------+-----------|
| 192KB | (9) 4164 | (9) 4164 | (9) 4164 | NONE |
|---------+------------+------------+------------+-----------|
| 256KB | (9) 4164 | (9) 4164 | (9) 4164 | (9) 4164 |
|---------+------------+------------+------------+-----------|
| 256KB | (9) 41256 | NONE | NONE | NONE |
|---------+------------+------------+------------+-----------|
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | SW2/3 | SW2/4 |
|--------------------+-------------------+-------------------|
| 64KB | On | On |
|--------------------+-------------------+-------------------|
| 128KB | Off | On |
|--------------------+-------------------+-------------------|
| 192KB | On | Off |
|--------------------+-------------------+-------------------|
| 256KB | Off | Off |
|--------------------+-------------------+-------------------|
| 640KB | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size |SW3/1|SW3/2|SW3/3|SW3/4|SW3/5|SW3/6|SW3/7|SW3/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 0 & 1 =| Off | On | Off | On | Off | On | Off | On |
| 41256 | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 2 & 3 =| Off | On | Off | On | Off | On | Off | On |
| 4164 | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size |SW4/1|SW4/2|SW4/3|SW4/4|SW4/5|SW4/6|SW4/7|SW4/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 0 & 1 =| Off | On | Off | On | Off | On | Off | On |
| 41256 | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 2 & 3 =| Off | On | Off | On | Off | On | Off | On |
| 4164 | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size |SW3/1|SW3/2|SW3/3|SW3/4|SW3/5|SW3/6|SW3/7|SW3/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 0 & 1 =| On | Off | On | Off | On | Off | On | Off |
| 4164 | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 2 & 3 =| On | Off | On | Off | On | Off | On | Off |
| 4164 | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size |SW4/1|SW4/2|SW4/3|SW4/4|SW4/5|SW4/6|SW4/7|SW4/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 0 & 1 =| On | Off | On | Off | On | Off | On | Off |
| 4164 | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Bank 2 & 3 =| On | Off | On | Off | On | Off | On | Off |
| 4164 | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR CONFIGURATION |
|------------------------------------------------------------|
| Type | SW2/5 | SW2/6 |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
|--------------------+-------------------+-------------------|
| 40 x 25 color | Off | On |
|--------------------+-------------------+-------------------|
| 80 x 25 color | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Type | SW2/7 | SW2/8 |
|-------------------+--------------------+-------------------|
| 1 | On | On |
|-------------------+--------------------+-------------------|
| 2 | Off | On |
|-------------------+--------------------+-------------------|
| 3 | On | Off |
|-------------------+--------------------+-------------------|
| 4 | Off | Off |
+------------------------------------------------------------+