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# AST RESEARCH, INC.
BRAVO LC 4/100T
Processor 80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T
Processor 25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Video Chip Cirrus Logic
Set
Maximum 64MB
Onboard
Memory
Maximum 1MB
Video
Memory
Cache 64/256KB
BIOS Unidentified
Dimensions 355mm x 304mm
I/O 32-bit VESA local bus slot, floppy drive interface, IDE
Options interface, parallel port, PS/2 mouse port, serial ports (2),
8514 video pass through connector, VGA port
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| PS/2 mouse port | CN1 | IDE interface | J22 |
|-------------------+----------+------------------+----------|
| Serial port | CN2 | Floppy drive | J24 |
| | | interface | |
|-------------------+----------+------------------+----------|
| Serial port | CN3 | Speaker | J27 |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | Chassis fan | J28 |
| | | power | |
|-------------------+----------+------------------+----------|
| VGA port | CN5 | Front panel LEDs | J29 |
|-------------------+----------+------------------+----------|
| 8514 video pass | J19 | 32-bit VESA | SL1 |
| through connector | | local bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | Parallel port IRQ select IRQ7 | E2 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Parallel port IRQ select IRQ5 | E2 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | On board video enabled | E7 | Closed |
|---+-----------------------------------+-------+------------|
| | On board video disabled | E7 | Open |
|---+-----------------------------------+-------+------------|
| » | Monitor type select color | E8 | Closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | E8 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | E9 | Closed |
|---+-----------------------------------+-------+------------|
| » | Password normal operation | E10 | Closed |
|---+-----------------------------------+-------+------------|
| | Password clear | E10 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | E11 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | E16 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | None | None | None |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 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 |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 1M x 36 | (1) 256K x | None | None |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | None |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 7MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 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 | |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 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 |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 4M x 36 | (1) 256K x | None | None |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | None |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 19MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 | None | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 21MB | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 22MB | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 25MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 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 | |
|------+-------------+-------------+------------+------------|
| 37MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 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 |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | E12 | E14 |
|-------------------+--------------------+-------------------|
| 64KB | Open | Open |
|-------------------+--------------------+-------------------|
| 256KB | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | E1 | E6 | E20 |
|---------------+-----------------+-----------------+--------|
| Write through | Pins 1 & 2 | Pins 1 & 2 | Open |
| | closed | closed | |
|---------------+-----------------+-----------------+--------|
| Write back | Pins 2 & 3 | Pins 2 & 3 | Closed |
| | closed | closed | |
|------------------------------------------------------------|
| Note: E20 may not be present on all boards. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION (1994 CONFIGURATION) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+---------------------+---------------------|
| 512KB | (4) 256K x 4 | None |
|----------------+---------------------+---------------------|
| 1MB | (4) 256K x 4 | (4) 256K x 4 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
| On some revisions, Bank 1 may be factory installed. Board |
| shown uses this configuration. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION (1995 CONFIGURATION) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+----------------------+---------------------|
| 512KB | (1) 256K x 16 | None |
|---------------+----------------------+---------------------|
| 1MB | (1) 256K x 16 | (1) 256K x 16 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
| On some revisions, Bank 1 may be factory installed. If |
| board is a 1995 configuration, install the upgrade chip in |
| socket U802. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | E15 |
|-------------------------------+----------------------------|
| 25MHz | Closed |
|-------------------------------+----------------------------|
| 33MHz | Open |
|-------------------------------+----------------------------|
| 50iMHz | Closed |
|-------------------------------+----------------------------|
| 66iMHz | Open |
|-------------------------------+----------------------------|
| 75iMHz | Closed |
|-------------------------------+----------------------------|
| 100iMHz | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | E3 | E4 | E5 | E13 |
|------------+------------+------------+------------+--------|
| 80486SX | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Open |
| (PQFP) | closed | closed | closed | |
|------------+------------+------------+------------+--------|
| 80486SX | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 | Closed |
| (PGA) | closed | closed | closed | |
|------------+------------+------------+------------+--------|
| SL80486DX | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Closed |
| | closed | closed | closed | |
|------------+------------+------------+------------+--------|
| SL80486DX2 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Closed |
| | closed | closed | closed | |
|------------+------------+------------+------------+--------|
| SL80486DX4 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Closed |
| | closed | closed | closed | |
|------------+------------+------------+------------+--------|
| P24T | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Closed |
| | closed | closed | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | E17 | E18 | E19 |
|-----------+-----------------+---------------+--------------|
| Cyrix | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+-----------------+---------------+--------------|
| Intel | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|------------------------------------------------------------|
| Note: These jumpers may not be present on all boards. If |
| they are not, board only supports processor that was |
| shipped from the factory. |
+------------------------------------------------------------+