AST RESEARCH, INC.
Bravo LC 4/33
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Processor |
80486SX/80486DX(on external CPU/Cache module) |
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Processor Speed |
25/33MHz(only with external CPU/Cache module) |
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Chip Set |
AST |
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Max. Onboard DRAM |
64MB |
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SRAM Cache |
None |
|
BIOS |
AST |
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Dimensions |
254mm x 338mm |
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I/O Options |
Bus mouse port, CPU/Cache upgrade module, floppy drive interface, IDE interface, LAN module, parallel port, serial port (2), VGA port |
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NPU Options |
None |
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CONNECTIONS |
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Purpose |
Location |
Purpose |
Location |
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Serial port 2 (COM2) |
J12 |
Floppy drive interface |
J24 |
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Parallel port |
J13 |
External speaker |
J27 |
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Bus mouse port |
J14 |
Fan power |
J28 |
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LAN module |
J15 & J16 |
Front panel switches & LEDs |
J29 |
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Serial port 1 (COM1) |
J17 |
Feature connector |
J46 |
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VGA port |
J18 |
CPU/Cache upgrade module |
J50, J51, J52, J53 |
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VGA pass-through |
J19 |
IDE interface LED |
J100 |
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IDE interface |
J22 |
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USER CONFIGURABLE SETTINGS |
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Function |
Jumper/Switch |
Position |
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Factory configured - do not alter |
E1 |
open |
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Factory configured - do not alter |
E2 |
pins 2 & 3 closed |
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Parallel port interrupt select IRQ7 |
E5 |
pins 2 & 3 closed |
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Parallel port interrupt select IRQ5 |
E5 |
pins 1 & 2 closed |
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CMOS memory normal operation |
E6 |
open |
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CMOS memory clear |
E6 |
closed |
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VGA port enabled |
SW1/switch 1 |
closed |
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VGA port disabled |
SW1/switch 1 |
open |
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Password check enabled |
SW1/switch 2 |
open |
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Password check disabled |
SW1/switch 2 |
closed |
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Factory configured - do not alter |
SW1/switch 3 |
open |
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Factory configured - do not alter |
SW1/switch 4 |
open |
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DRAM CONFIGURATION |
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Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
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2MB |
(1) 256K x 36 |
(1) 256K x 36 |
NONE |
NONE |
|
4MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
4MB |
(1) 1M x 36 |
NONE |
NONE |
NONE |
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8MB |
(1) 1M x 36 |
(1) 1M x 36 |
NONE |
NONE |
|
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 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 36 |
(1) 4M x 36 |
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VRAM CONFIGURATION |
|
|
Size |
VRAM |
|
512KB |
(4) 44256 |
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CONNECTIONS |
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|
Purpose |
Location |
|
CPU/Cache upgrade module |
J50, J51, J52, J53 |
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Note: Connections are on the backside of the module and correspond to the connector with the same label on the motherboard. |
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CPU/CACHE MODULE TYPE CONFIGURATION |
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Module Type |
Jumper E4 |
Jumper E5 |
Jumper E7 |
Jumper E8 |
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|
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CPU only |
open |
closed |
closed |
closed |
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Cache only |
closed |
open |
open |
open |
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CPU and Cache |
closed |
closed |
open |
open |
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Note: These settings are given for information only and should not be changed. |
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CPU SPEED CONFIGURATION |
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Internal |
External |
Jumper E1 |
Jumper E3 |
Jumper E6 |
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25MHz |
25MHz |
closed |
closed |
open |
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33MHz |
33MHz |
open |
closed |
open |
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|
50MHz |
25MHz |
closed |
closed |
open |
|
|
66MHz |
33MHz |
open |
closed |
open |
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Note: These settings are given for information only and should not be changed. |
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CPU TYPE CONFIGURATION |
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CPU Type |
Jumper E2 |
Jumper E9 |
Jumper E10 |
Jumper E11 |
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80486DX2 |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
closed |
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ODP486SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
closed |
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80486DX |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
closed |
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80487SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
closed |
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80486SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
open |
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|
None |
open |
open |
open |
open |
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Note: These settings are given for information only and should not be changed. |
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