AST RESEARCH, INC.
BRAVO LC 4/100T
|
Processor |
80486SX/SL80486DX/SL80486DX2/SL80486DX4/P24T |
|
Processor Speed |
25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
Cirrus Logic |
|
Maximum Onboard Memory |
64MB |
|
Maximum Video Memory |
1MB |
|
Cache |
64/256KB |
|
BIOS |
Unidentified |
|
Dimensions |
355mm x 304mm |
|
I/O Options |
32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), 8514 video pass through connector, VGA port |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
PS/2 mouse port |
CN1 |
IDE interface |
J22 |
|
Serial port |
CN2 |
Floppy drive interface |
J24 |
|
Serial port |
CN3 |
Speaker |
J27 |
|
Parallel port |
CN4 |
Chassis fan power |
J28 |
|
VGA port |
CN5 |
Front panel LEDs |
J29 |
|
8514 video pass through connector |
J19 |
32-bit VESA local bus slot |
SL1 |
|
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 36 |
None |
None |
None |
|
2MB |
(1) 256K x 36 |
(1) 256K x 36 |
None |
None |
|
3MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
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 |
|
5MB |
(1) 1M x 36 |
(1) 256K x 36 |
None |
None |
|
6MB |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
None |
|
7MB |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
None |
None |
|
9MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
None |
|
10MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
12MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
13MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
|
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 |
|
17MB |
(1) 4M x 36 |
(1) 256K x 36 |
None |
None |
|
18MB |
(1) 4M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
None |
|
19MB |
(1) 4M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 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 36 |
None |
|
22MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
24MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
25MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
|
28MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
None |
None |
|
33MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 256K x 36 |
None |
|
34MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
36MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
None |
|
37MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 256K x 36 |
|
40MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
48MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
None |
|
49MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 256K x 36 |
|
52MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 1M x 36 |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 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 closed |
Pins 1 & 2 closed |
Open |
|
Write back |
Pins 2 & 3 closed |
Pins 2 & 3 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 (PQFP) |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Open |
|
80486SX (PGA) |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Closed |
|
SL80486DX |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Closed |
|
SL80486DX2 |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Closed |
|
SL80486DX4 |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Closed |
|
P24T |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Closed |
|
CPU TYPE SELECTION | |||
|
Type |
E17 |
E18 |
E19 |
|
Cyrix |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
Intel |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 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. | |||