BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1420/1425/1433PB REV. A
MB-1420/1425/1433PV REV. A
|
Processor |
80486SX/80487SX/P23T/80486DX/80486DX2 |
|
Processor Speed |
20/25/33/50(internal)/50/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
32MB |
|
Cache |
None |
|
BIOS |
AMI |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Power LED & keylock |
J1 |
Turbo switch |
JP6 |
|
Speaker |
J2 |
External battery |
JP8 |
|
Turbo LED |
J3 |
Reset switch |
SW1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Monitor type select color |
JP5 |
Closed |
|
Monitor type select monochrome |
JP5 |
Open | |
|
|
CMOS memory normal operation |
JP7 |
pins 2 & 3 closed |
|
CMOS memory clear |
JP7 |
pins 1 & 2 closed | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
5MB |
(4) 1M x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CPU TYPE CONFIGURATION | ||||
|
Type |
JP9 |
JP10 |
JP11 |
JP12 |
|
80486SX (PQFP) |
Open |
Open |
Closed |
Open |
|
80486SX (PGA) |
Open |
Open |
2 & 3 |
Open |
|
80487SX |
2 & 3 |
1 & 2 |
Closed |
Open |
|
80486SX (PQFP) & 80487SX |
2 & 3 |
1 & 2 |
Closed |
1 & 2 |
|
80486SX (PQFP) & P23T |
2 & 3 |
1 & 2 |
Closed |
2 & 3 |
|
80486SX (PQFP) & 80486DX/DX2 |
1 & 2 |
1 & 2 |
Closed |
2 & 3 |
|
80486DX |
1 & 2 |
1 & 2 |
Closed |
Open |
|
80486DX2 |
1 & 2 |
1 & 2 |
Closed |
Open |
|
Note: Pins designated should be in the closed position. | ||||
|
KEYBOARD BIOS CONFIGURATION | ||||
|
Type |
JP1 |
JP2 |
JP3 |
JP4 |
|
8042 (23 pins) |
Closed |
Open |
Open |
Open |
|
8042 (24 pins) |
Open |
Closed |
Open |
Open |
|
8042 (27 pins) |
Open |
Open |
Closed |
Open |
|
8042 (30 pins) |
Open |
Open |
Open |
Closed |