BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-1420/1425/1433V
|
Processor |
80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive |
|
Processor Speed |
20/25/33/50(internal)/50/66(internal)MHz |
|
Chip Set |
VLSI |
|
Max. Onboard DRAM |
32MB |
|
Cache |
None |
|
BIOS |
Award |
|
Dimensions |
230mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Speaker |
J1 |
Turbo switch |
J5 |
|
Power LED & keylock |
J2 |
5v DC ground |
J6 |
|
Turbo LED |
J3 |
External battery |
CN2 |
|
Reset switch |
J4 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Keyboard type select BTC keyboard |
JP1 |
Closed |
|
Normal operation |
JP1 |
Open | |
|
|
AT bus clock mode select asynchronous |
JP2 |
pins 1 & 2 closed |
|
AT bus clock mode select synchronous |
JP2 |
pins 2 & 3 closed | |
|
|
Monitor type select monochrome |
JP3 |
Open |
|
Monitor type select color |
JP3 |
Closed | |
|
|
8042 turbo control pin select pin 30 closed |
JP4 |
pins 1 & 2 closed |
|
8042 turbo control pin select pin 23 closed |
JP4 |
pins 2 & 3 closed | |
|
|
CMOS memory normal operation |
JP5 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP5 |
pins 3 & 4 closed | |
|
|
On board keyboard fuse enabled |
JP9 |
Open |
|
On board keyboard fuse disabled |
JP9 |
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) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
17MB |
(4) 256K x 9 |
(4) 4M x 9 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CPU TYPE CONFIGURATION (PQFP CPU INSTALLED) | ||||
|
Type |
JP7 |
JP8 |
JP14 |
JP15 |
|
80486SX (PQFP) & upgrade to DX/DX2 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
|
80486SX (PQFP) & upgrade to Overdrive |
open |
1 & 2 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | ||||
|
CPU TYPE CONFIGURATION (PGA ONLY CPU INSTALLED) | ||||
|
Type |
JP7 |
JP8 |
JP14 |
JP15 |
|
80487SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
Open |
|
80486DX/DX2 |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
Open |
|
Note: The PQFP CPU is optional and may not be present. If there is no PQFP, use the above settings. | ||||