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# AST RESEARCH, INC.
Bravo LC 4/50D
Processor 80486SX/80486DX2 (on external CPU/Cache
module)
Processor Speed 25/50(internal)MHz (only with external
CPU/Cache module)
Chip Set AST
Max. Onboard 64MB
DRAM
Cache 256KB (on external CPU/Cache module)
BIOS AST
Dimensions 254mm x 338mm
I/O Options Bus mouse port, CPU/Cache upgrade module,
floppy drive interface, IDE interface, LAN
module, parallel port, serial port (2), VGA
port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Serial port 2 | J12 | Floppy drive | J24 |
| (COM2) | | interface | |
|------------------+----------+-------------------+----------|
| Parallel port | J13 | External speaker | J27 |
|------------------+----------+-------------------+----------|
| Bus mouse port | J14 | Fan power | J28 |
|------------------+----------+-------------------+----------|
| LAN module | J15 & | Front panel | J29 |
| | J16 | switches & LEDs | |
|------------------+----------+-------------------+----------|
| Serial port 1 | J17 | Feature connector | J46 |
| (COM1) | | | |
|------------------+----------+-------------------+----------|
| VGA port | J18 | CPU/Cache upgrade | J50, |
| | | module | J51, |
| | | | J52, J53 |
|------------------+----------+-------------------+----------|
| VGA pass-through | J19 | IDE interface LED | J100 |
|------------------+----------+-------------------+----------|
| IDE interface | J22 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | E1 | open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E2 | pins 2 & 3 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Parallel port interrupt | E5 | pins 2 & 3 |
| | select IRQ7 | | closed |
|---+---------------------------+---------------+------------|
| | Parallel port interrupt | E5 | pins 1 & 2 |
| | select IRQ5 | | closed |
|---+---------------------------+---------------+------------|
| » | CMOS memory normal | E6 | open |
| | operation | | |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | E6 | closed |
|---+---------------------------+---------------+------------|
| » | VGA port enabled | SW1/switch 1 | closed |
|---+---------------------------+---------------+------------|
| | VGA port disabled | SW1/switch 1 | open |
|---+---------------------------+---------------+------------|
| » | Password check enabled | SW1/switch 2 | open |
|---+---------------------------+---------------+------------|
| | Password check disabled | SW1/switch 2 | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 3 | open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 4 | open |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 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 |
|------+-------------+-------------+------------+------------|
| 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 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | VRAM |
|--------------------+---------------------------------------|
| 512KB | (4) 44256 |
+------------------------------------------------------------+
IMG IMG 2
PROCESSOR/CACHE MODULE
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|----------------------------------+-------------------------|
| CPU/Cache upgrade module | J50, J51, J52, J53 |
|------------------------------------------------------------|
| Note:Connections are on the back side of the module and |
| correspond to the connector with the same label on the |
| motherboard. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM |
|----------------------------+-------------------------------|
| 256KB | (8) 256K x 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU/CACHE MODULE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Module Type | Jumper E4 | Jumper E5 | Jumper | Jumper |
| | | | E7 | E8 |
|------------------+-----------+-----------+--------+--------|
| | CPU only | open | closed | closed | closed |
|----+-------------+-----------+-----------+--------+--------|
| | Cache only | closed | open | open | open |
|----+-------------+-----------+-----------+--------+--------|
| » | CPU and | closed | closed | open | open |
| | Cache | | | | |
|------------------------------------------------------------|
| Note: These settings are given for information only and |
| should not be changed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Internal | External | Jumper E1 | Jumper | Jumper |
| | | | E3 | E6 |
|---------------+-----------+------------+---------+---------|
| | 25MHz | 25MHz | closed | closed | open |
|-----+---------+-----------+------------+---------+---------|
| | 33MHz | 33MHz | open | closed | open |
|-----+---------+-----------+------------+---------+---------|
| » | 50MHz | 25MHz | closed | closed | open |
|-----+---------+-----------+------------+---------+---------|
| | 66MHz | 33MHz | open | closed | open |
|------------------------------------------------------------|
| Note: These settings are given for information only and |
| should not be changed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | Jumper E2 | Jumper E9 | Jumper | Jumper |
| | | | E10 | E11 |
|--------------+-------------+-----------+----------+--------|
| » | 80486DX2 | pins 2 & 3 | pins 2 & | pins 2 & | closed |
| | | closed | 3 closed | 3 closed | |
|---+----------+-------------+-----------+----------+--------|
| | ODP486SX | pins 1 & 2 | pins 2 & | pins 1 & | closed |
| | | closed | 3 closed | 2 closed | |
|---+----------+-------------+-----------+----------+--------|
| | 80486DX | pins 2 & 3 | pins 2 & | pins 2 & | closed |
| | | closed | 3 closed | 3 closed | |
|---+----------+-------------+-----------+----------+--------|
| | 80487SX | pins 1 & 2 | pins 2 & | pins 2 & | closed |
| | | closed | 3 closed | 3 closed | |
|---+----------+-------------+-----------+----------+--------|
| | 80486SX | pins 1 & 2 | pins 2 & | pins 2 & | open |
| | | closed | 3 closed | 3 closed | |
|---+----------+-------------+-----------+----------+--------|
| | None | open | open | open | open |
|------------------------------------------------------------|
| Note: These settings are given for information only and |
| should not be changed. |
+------------------------------------------------------------+