Bravo LC 4/66D Motherboard Settings and Configuration
AST RESEARCH, INC.
Bravo LC 4/66D
Processor | 80486SX/80486DX2 (on external CPU/Cache module) |
Processor Speed | 25/66I MHz (only with external CPU/Cache module) |
Chip Set | AST |
Max. Onboard DRAM | 64MB |
SRAM 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 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Serial port 2 (COM2) | J12 | Floppy drive interface | J24 |
Parallel port | J13 | External speaker | J27 |
Bus mouse port | J14 | Fan power | J28 |
LAN module | J15 & J16 | Front panel switches & LEDs | J29 |
Serial port 1 (COM1) | J17 | Feature connector | J46 |
VGA port | J18 | CPU/Cache upgrade module | J50, J51, J52, J53 |
VGA pass-through | J19 | IDE interface LED | J100 |
IDE interface | J22 |
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USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Factory configured - do not alter | E1 | open |
» | Factory configured - do not alter | E2 | pins 2 & 3 closed |
» | Parallel port interrupt select IRQ7 | E5 | pins 2 & 3 closed |
| Parallel port interrupt select IRQ5 | E5 | pins 1 & 2 closed |
» | CMOS memory normal operation | E6 | open |
| 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 not alter | SW1/switch 3 | open |
» | Factory configured - do not alter | SW1/switch 4 | open |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
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 |
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 |
VRAM CONFIGURATION | |
Size | VRAM |
512KB | (4) 44256 |
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 E7 | Jumper E8 | |
| CPU only | open | closed | closed | closed |
| Cache only | closed | open | open | open |
» | CPU and Cache | closed | closed | open | open |
Note:These settings are given for information only and should not be changed. | |||||
CPU SPEED CONFIGURATION | |||||
Internal | External | Jumper E1 | Jumper E3 | Jumper 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 E10 | Jumper E11 | |
» | 80486DX2 | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | closed |
| ODP486SX | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed | closed |
| 80486DX | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | closed |
| 80487SX | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | closed |
| 80486SX | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | open |
| None | open | open | open | open |
Note:These settings are given for information only and should not be changed. | |||||
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