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# AST RESEARCH, INC.
BRAVO MS 486 (COBRA) (202612-XXX)
Processor 80486SX/80486DX/ODP486SX/80486DX2/80486DX4/Pentium
Overdrive
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set AST
Max. 128MB
Onboard
DRAM
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports (2),
VGA feature connector, VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| VGA port | CN1 | External battery | J26 |
|------------------+----------+-------------------+----------|
| Parallel port | CN2 | Speaker | J27 |
|------------------+----------+-------------------+----------|
| Serial port 2 | CN3 | Chassis fan power | J28 |
|------------------+----------+-------------------+----------|
| Serial port 1 | CN4 | Front panel | J29 |
| | | connector | |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | CN5 | Chassis fan power | J32 |
|------------------+----------+-------------------+----------|
| VGA feature | J19 | IDE interface LED | J40 |
| connector | | | |
|------------------+----------+-------------------+----------|
| IDE interface 2 | J22 | Video memory | SL1 |
| | | upgrade slot | |
|------------------+----------+-------------------+----------|
| IDE interface 1 | J23 | Riser Card | SL2 |
|------------------+----------+-------------------+----------|
| Floppy drive | J24 | | |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Cache type select write | E1 | Open |
| | back | | |
|---+---------------------------+---------------+------------|
| | Cache type select write | E1 | Closed |
| | through | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E6 | pins 1 & 2 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | CMOS memory normal | E8 | Open |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | E8 | Closed |
|---+---------------------------+---------------+------------|
| » | Video memory enabled | E800 | Closed |
|---+---------------------------+---------------+------------|
| | Video memory disabled | E800 | Open |
|---+---------------------------+---------------+------------|
| » | Flash BIOS write protect | SW1/1 | On |
| | enabled | | |
|---+---------------------------+---------------+------------|
| | Flash BIOS write protect | SW1/1 | Off |
| | disabled | | |
|---+---------------------------+---------------+------------|
| » | Password enabled | SW1/2 | On |
|---+---------------------------+---------------+------------|
| | Password disabled | SW1/2 | Off |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | SW1/3 | On |
|---+---------------------------+---------------+------------|
| | Monitor type select | SW1/3 | Off |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| » | System setup enabled | SW1/4 | Off |
|---+---------------------------+---------------+------------|
| | system setup disabled | SW1/4 | On |
|---+---------------------------+---------------+------------|
| » | On board video enabled | SW1/5 | On |
|---+---------------------------+---------------+------------|
| | On board video disabled | SW1/5 | Off |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/6 | On |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/7 | On |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/8 | On |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 33MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 49MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 65MB | (1) 8M x 36 | (1) 8M x 36 | (1) 256K x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 66MB | (1) 8M x 36 | (1) 8M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 8M x 36 | (1) 8M x | (1) 1M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 8M x 36 | (1) 8M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | E5 |
|-----------------------------+------------------------------|
| 64KB | Open |
|-----------------------------+------------------------------|
| 256KB | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | E1 | E2 | E3 | E4 |
|--------------------+------+------------+------------+------|
| 80486SX (PQFP) | Open | pins 2 & 3 | pins 1 & 2 | Open |
| | | closed | closed | |
|--------------------+------+------------+------------+------|
| ODP486SX | Open | pins 2 & 3 | pins 1 & 2 | Open |
| | | closed | closed | |
|--------------------+------+------------+------------+------|
| 80486DX (write | Open | pins 1 & 2 | pins 2 & 3 | Open |
| back) | | closed | closed | |
|--------------------+------+------------+------------+------|
| 80486DX/DX2 | Open | pins 1 & 2 | pins 1 & 2 | Open |
| | | closed | closed | |
|--------------------+------+------------+------------+------|
| 80486DX4 | Open | pins 1 & 2 | pins 1 & 2 | Open |
| | | closed | closed | |
|--------------------+------+------------+------------+------|
| Pentium Overdrive | Open | pins 2 & 3 | pins 2 & 3 | Open |
| | | closed | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | E7 | E9 |
|-------------------+--------------------+-------------------|
| 25MHz | pins 1 & 2 closed | Closed |
|-------------------+--------------------+-------------------|
| 33MHz | pins 2 & 3 closed | Open |
|-------------------+--------------------+-------------------|
| 50iMHz | pins 1 & 2 closed | Closed |
|-------------------+--------------------+-------------------|
| 66iMHz | pins 2 & 3 closed | Open |
+------------------------------------------------------------+