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# AST RESEARCH, INC.
BRAVO 286/386SX SYSTEM BOARD (202382-001, 002, 005)
Processor 80386SX
Processor Speed 20MHz
Chip Set AST
Max. Onboard 16MB
DRAM
Cache None
BIOS AST
Dimensions 355mm x 251mm
I/O Options 16-bit external CPU/NPU card slot, bus mouse
port, floppy interface, IDE interface,
parallel port, serial ports (2), VGA port
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Bus mouse port | J12 | Floppy drive | J24 |
| | | interface | |
|------------------+----------+-------------------+----------|
| Parallel port | J13 | External battery | J26 |
|------------------+----------+-------------------+----------|
| Primary serial | J14 | Speaker | J27 |
| port | | | |
|------------------+----------+-------------------+----------|
| VGA port | J18 | Fan connector | J28 |
|------------------+----------+-------------------+----------|
| VGA pass-thru | J19 | Front panel | J29 |
| | | switch/display | |
|------------------+----------+-------------------+----------|
| Secondary serial | J20 | 16-bit external | J34 |
| port header | | CPU/NPU card | |
|------------------+----------+-------------------+----------|
| IDE interface | J22 | Drive active LED | J35 |
| | | connector | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|----------------------------------------+--------+----------|
| » | VGA interface enabled | SW1/1 | On |
|---+------------------------------------+--------+----------|
| | VGA interface disabled | SW1/1 | Off |
|---+------------------------------------+--------+----------|
| » | Password check normal operation | SW1/2 | Off |
|---+------------------------------------+--------+----------|
| | Password clear | SW1/2 | On |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/3 | Off |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/4 | Off |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/5 | On |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/6 | On |
|---+------------------------------------+--------+----------|
| » | PS/2 mode enabled (AT mode | SW1/7 | On |
| | disabled) | | |
|---+------------------------------------+--------+----------|
| | PS/2 mode disabled (AT mode | SW1/7 | Off |
| | enabled) | | |
|---+------------------------------------+--------+----------|
| » | Monitor type select fixed | SW1/8 | Off |
| | frequency | | |
|---+------------------------------------+--------+----------|
| | Monitor type select | SW1/8 | On |
| | multi-frequency | | |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/9 | Off |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/10 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (2) 256K x 9 | (2) 256K x 9 | NONE |
|------------+---------------+---------------+---------------|
| 1.5MB | (2) 256K x 9 | (2) 256K x 9 | (2) 256K x 9 |
|------------+---------------+---------------+---------------|
| 2MB | (2) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 3MB | (2) 256K x 9 | (2) 256K x 9 | (2) 1M x 9 |
|------------+---------------+---------------+---------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE |
|------------+---------------+---------------+---------------|
| 4.5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x 9 |
|------------+---------------+---------------+---------------|
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 |
|------------+---------------+---------------+---------------|
| 8MB | (2) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 9MB | (2) 256K x 9 | (2) 256K x 9 | (2) 4M x 9 |
|------------+---------------+---------------+---------------|
| 12MB | (2) 1M x 9 | (2) 1M x 9 | (2) 4M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 | NONE |
+------------------------------------------------------------+