AST RESEARCH, INC.
BRAVO MS 486 (COBRA) (202612-XXX)
|
Processor |
80486SX/80486DX/ODP486SX/80486DX2/80486DX4/Pentium Overdrive |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
AST |
|
Max. Onboard DRAM |
128MB |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
CN1 |
External battery |
J26 |
|
Parallel port |
CN2 |
Speaker |
J27 |
|
Serial port 2 |
CN3 |
Chassis fan power |
J28 |
|
Serial port 1 |
CN4 |
Front panel connector |
J29 |
|
PS/2 mouse port |
CN5 |
Chassis fan power |
J32 |
|
VGA feature connector |
J19 |
IDE interface LED |
J40 |
|
IDE interface 2 |
J22 |
Video memory upgrade slot |
SL1 |
|
IDE interface 1 |
J23 |
Riser Card |
SL2 |
|
Floppy drive interface |
J24 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper/Switch |
Position | |
|
|
Cache type select write back |
E1 |
Open |
|
Cache type select write through |
E1 |
Closed | |
|
|
Factory configured - do not alter |
E6 |
pins 1 & 2 closed |
|
|
CMOS memory normal |
E8 |
Open |
|
CMOS memory clear |
E8 |
Closed | |
|
|
Video memory enabled |
E800 |
Closed |
|
Video memory disabled |
E800 |
Open | |
|
|
Flash BIOS write protect enabled |
SW1/1 |
On |
|
Flash BIOS write protect disabled |
SW1/1 |
Off | |
|
|
Password enabled |
SW1/2 |
On |
|
Password disabled |
SW1/2 |
Off | |
|
|
Monitor type select color |
SW1/3 |
On |
|
Monitor type select monochrome |
SW1/3 |
Off | |
|
|
System setup enabled |
SW1/4 |
Off |
|
system setup disabled |
SW1/4 |
On | |
|
|
On board video enabled |
SW1/5 |
On |
|
On board video disabled |
SW1/5 |
Off | |
|
|
Factory configured - do not alter |
SW1/6 |
On |
|
|
Factory configured - do not alter |
SW1/7 |
On |
|
|
Factory configured - do not alter |
SW1/8 |
On |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
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 |
|
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 |
|
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 |
|
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 |
|
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 |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
64MB |
(1) 8M x 36 |
(1) 8M x 36 |
NONE |
NONE |
|
65MB |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 256K x 36 |
NONE |
|
66MB |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
DRAM CONFIGURATION (CONT) | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
68MB |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 1M x 36 |
NONE |
|
72MB |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
96MB |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 8M x 36 |
NONE |
|
128MB |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 8M x 36 |
(1) 8M x 36 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |
|
Size |
E5 |
|
64KB |
Open |
|
256KB |
Closed |
|
CPU TYPE CONFIGURATION | ||||
|
Type |
E1 |
E2 |
E3 |
E4 |
|
80486SX (PQFP) |
Open |
pins 2 & 3 closed |
pins 1 & 2 closed |
Open |
|
ODP486SX |
Open |
pins 2 & 3 closed |
pins 1 & 2 closed |
Open |
|
80486DX (write back) |
Open |
pins 1 & 2 closed |
pins 2 & 3 closed |
Open |
|
80486DX/DX2 |
Open |
pins 1 & 2 closed |
pins 1 & 2 closed |
Open |
|
80486DX4 |
Open |
pins 1 & 2 closed |
pins 1 & 2 closed |
Open |
|
Pentium Overdrive |
Open |
pins 2 & 3 closed |
pins 2 & 3 closed |
Open |
|
CPU SPEED CONFIGURATION | ||
|
Speed |
E7 |
E9 |
|
25MHz |
pins 1 & 2 closed |
Closed |
|
33MHz |
pins 2 & 3 closed |
Open |
|
50iMHz |
pins 1 & 2 closed |
Closed |
|
66iMHz |
pins 2 & 3 closed |
Open |