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# AMERICAN RESEARCH CORPORATION
286 System
Processor 80286
Processor Speed 8/10MHz
Chip Set Unknown
Max. Onboard 1MB
DRAM
Cache None
BIOS ARC
Dimensions 330mm x 218mm
I/O Options EGA port, floppy drive interface, MIPS meter,
parallel port, serial ports (2), ST506 hard
drive interface
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Video monitor | CN1 | ST506 hard | CN7 |
| port | | drive(control) | |
|------------------+----------+-------------------+----------|
| Parallel port | CN2 | Floppy drive | CN8 |
| | | interface | |
|------------------+----------+-------------------+----------|
| Serial port 1 | CN3 | Speaker | CN9 |
|------------------+----------+-------------------+----------|
| Serial port 2 | CN4 | Keyboard | CN10 |
|------------------+----------+-------------------+----------|
| ST506 hard drive | CN5 | MIPS meter | CN11 |
| two(data) | | | |
|------------------+----------+-------------------+----------|
| ST506 hard drive | CN6 | External battery | J16 |
| one(data) | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|----------------------------+---------------+---------------|
| » | BIOS type select 27128 | J1 | Open |
|---+------------------------+---------------+---------------|
| | BIOS type select 27256 | J1 | Closed |
|---+------------------------+---------------+---------------|
| » | DRAM wait states | J2 | Closed |
| | select zero | | |
|---+------------------------+---------------+---------------|
| | DRAM wait state select | J2 | Open |
| | one | | |
|---+------------------------+---------------+---------------|
| » | Monitor type select | J4 | pins 1 & 2 |
| | EGA | | closed |
|---+------------------------+---------------+---------------|
| | Monitor type select | J4 | pins 2 & 3 |
| | CGA or monochrome | | closed |
|---+------------------------+---------------+---------------|
| » | Serial port COM1 | J5 | pins 2 & 3 |
| | enabled | | closed |
|---+------------------------+---------------+---------------|
| | Serial port COM1 | J5 | pins 1 & 2 |
| | disabled | | closed |
|---+------------------------+---------------+---------------|
| » | Serial port COM2 | J6 | pins 2 & 3 |
| | enabled | | closed |
|---+------------------------+---------------+---------------|
| | Serial port COM2 | J6 | pins 1 & 2 |
| | disabled | | closed |
|---+------------------------+---------------+---------------|
| » | Parallel port LPT1 | J7 | pins 2 & 3 |
| | enabled | | closed |
|---+------------------------+---------------+---------------|
| | Parallel port LPT1 | J7 | pins 1 & 2 |
| | disabled | | closed |
|---+------------------------+---------------+---------------|
| » | Factory configured - | J8 | pins 1 & 2, 3 |
| | do not alter | | & 4 closed |
|---+------------------------+---------------+---------------|
| » | Factory configured - | J9 | pins 1 & 2 |
| | do not alter | | closed |
|---+------------------------+---------------+---------------|
| » | Monitor port starting | J11 | pins 1 & 2 |
| | address select primary | | closed |
|---+------------------------+---------------+---------------|
| | Monitor port starting | J11 | pins 2 & 3 |
| | address select | | closed |
| | secondary | | |
|---+------------------------+---------------+---------------|
| » | Factory configured - | J13 | Open |
| | do not alter | | |
|---+------------------------+---------------+---------------|
| » | Hard drive address | J14 | pins 1 & 3 |
| | select primary | | closed |
|---+------------------------+---------------+---------------|
| | Hard drive address | J14 | pins 1 & 2 |
| | select secondary | | closed |
|---+------------------------+---------------+---------------|
| » | Floppy drive address | J14 | pins 5 & 6 |
| | select primary | | closed |
|---+------------------------+---------------+---------------|
| | Floppy drive address | J14 | pins 4 & 6 |
| | select secondary | | closed |
|---+------------------------+---------------+---------------|
| » | Floppy drive type | J15 | pins 1 & 4 |
| | select single speed | | open |
|---+------------------------+---------------+---------------|
| | Floppy drive type | J15 | pins 1 & 4 |
| | select dual speed | | closed |
|---+------------------------+---------------+---------------|
| » | Floppy drive write | J15 | pins 2 & 3 |
| | precompensation select | | open |
| | 125ns | | |
|---+------------------------+---------------+---------------|
| | Floppy drive write | J15 | pins 2 & 3 |
| | precompensation select | | closed |
| | 187ns | | |
|---+------------------------+---------------+---------------|
| » | CPU speed select | J20 | pins 1 & 6 |
| | switchable at turbo | | closed |
| | switch | | |
|---+------------------------+---------------+---------------|
| | CPU speed select | J20 | pins 2 & 5 |
| | switchable at keyboard | | closed |
|---+------------------------+---------------+---------------|
| | CPU speed select fast | J20 | pins 3 & 4 |
| | | | closed |
|---+------------------------+---------------+---------------|
| » | Monitor type select | J21 | pins 2 & 3 |
| | color | | closed |
|---+------------------------+---------------+---------------|
| | Monitor type select | J21 | pins 1 & 2 |
| | monochrome | | closed |
|---+------------------------+---------------+---------------|
| » | Factory configured - | SW1/7 | Off |
| | do not alter | | |
|---+------------------------+---------------+---------------|
| » | Factory configured - | SW1/8 | Off |
| | do not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J17 |
|---------------------------------------------+--------------|
| 512KB (disable memory above 512KB) | Closed |
|---------------------------------------------+--------------|
| 1MB (all memory is enabled) | Open |
|------------------------------------------------------------|
| Note:The system is factory configured with 1MB installed |
| on-board. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J18 | J19 |
|------------------+--------------------+--------------------|
| OSC Y1/3 | N/A | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 5.3MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 8MHz | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SINGLE MONITOR SYSTEM SWITCH CONFIGURATION (PRIMARY |
| MONITOR CONNECTED AT CN1) |
|------------------------------------------------------------|
| Monitor Type | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|-----------------------+---------+--------+--------+--------|
| Monochrome | Off | Off | On | Off |
|-----------------------+---------+--------+--------+--------|
| CGA 40 x 25 | On | Off | Off | On |
|-----------------------+---------+--------+--------+--------|
| CGA 80 x 25 | Off | Off | Off | On |
|-----------------------+---------+--------+--------+--------|
| EGA Low Resolution | On | On | On | Off |
|-----------------------+---------+--------+--------+--------|
| EGA High Resolution | Off | On | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DUAL MONITOR SYSTEM SWITCH CONFIGURATION (PRIMARY MONITOR |
| CONNECTED AT CN1) |
|------------------------------------------------------------|
| Primary | Secondary | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|------------+------------+--------+--------+--------+-------|
| Monochrome | CGA 40 x | On | Off | On | Off |
| | 25 | | | | |
|------------+------------+--------+--------+--------+-------|
| Monochrome | CGA 80 x | Off | Off | On | Off |
| | 25 | | | | |
|------------+------------+--------+--------+--------+-------|
| CGA 40 x | Monochrome | On | Off | Off | On |
| 25 | | | | | |
|------------+------------+--------+--------+--------+-------|
| CGA 80 x | Monochrome | Off | Off | Off | On |
| 25 | | | | | |
|------------+------------+--------+--------+--------+-------|
| EGA Low | Monochrome | On | On | On | Off |
| Res | | | | | |
|------------+------------+--------+--------+--------+-------|
| EGA High | Monochrome | Off | On | On | Off |
| Res | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DUAL MONITOR SYSTEM SWITCH CONFIGURATION (SECONDARY |
| MONITOR CONNECTED AT CN1) |
|------------------------------------------------------------|
| Primary | Secondary | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|------------+------------+--------+--------+--------+-------|
| CGA 40 x | Monochrome | On | On | Off | On |
| 25 | | | | | |
|------------+------------+--------+--------+--------+-------|
| CGA 80 x | Monochrome | Off | On | Off | On |
| 25 | | | | | |
|------------+------------+--------+--------+--------+-------|
| Monochrome | CGA 40 x | On | On | On | On |
| | 25 | | | | |
|------------+------------+--------+--------+--------+-------|
| Monochrome | CGA 80 x | Off | On | On | On |
| | 25 | | | | |
|------------+------------+--------+--------+--------+-------|
| Monochrome | EGA Low | On | Off | On | On |
| | Res | | | | |
|------------+------------+--------+--------+--------+-------|
| Monochrome | EGA High | Off | Off | On | On |
| | Res | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PRIMARY MONITOR POWER-ON CONFIGURATION |
|------------------------------------------------------------|
| Monitor Type | Mode at Power-On | SW1/5 | SW1/6 |
|--------------------+------------------+----------+---------|
| Monochrome/CGA/EGA | MDA/Hercules | Off | On |
|--------------------+------------------+----------+---------|
| CGA/EGA | CGA | On | Off |
|--------------------+------------------+----------+---------|
| EGA | EGA | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR MODE CONFIGURATION |
|------------------------------------------------------------|
| Setting | J10 | J12 |
|----------------------------------+------------+------------|
| Switchable by software using the | pins 2 & 3 | pins 2 & 3 |
| utility AUTOMODE.COM | closed | closed |
|----------------------------------+------------+------------|
| CGA/EGA (AUTOMODE.COM utility | pins 1 & 2 | pins 1 & 2 |
| cannot be used) | closed | closed |
+------------------------------------------------------------+