VEXTREC TECHNOLOGY, INC.
GMB-486UN (VER. 3.00)
|
Device Type |
Mainboard |
|
Processor |
80486SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/50/66MHz |
|
Chip Set |
Unidentified |
|
Maximum Onboard Memory |
32MB DRAM |
|
Cache |
32/64/128/256KB |
|
BIOS |
Acer |
|
I/O Options |
None |
|
CONNECTIONS | |||
|
External battery |
JP1 |
Turbo LED |
JP16 |
|
Reset switch |
JP14 |
Speaker |
JP17 |
|
Turbo switch |
JP15 |
Power LED & keylock |
JP18 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
CMOS memory normal operation |
JP2 |
Pins 1 & 2 closed |
|
CMOS memory clear |
JP2 |
Pins 2 & 3 closed | |
|
|
Hardware emulate KBGA20 |
JP10 |
Pins 1 & 2 closed |
|
Keyboard controller 8042 |
JP10 |
Pins 2 & 3 closed | |
|
|
Color display enabled |
JP12 |
Closed |
|
Monochrome display enabled |
JP12 |
Open | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256KB x 9 |
None |
|
2MB |
(4) 256KB x 9 |
(4) 256KB x 9 |
|
4MB |
(4) 1MB x 9 |
None |
|
5MB |
(4) 1MB x 9 |
(4) 256KB x 9 |
|
8MB |
(4) 1MB x 9 |
(4) 1MB x 9 |
|
16MB |
(4) 4MB x 9 |
None |
|
17MB |
(4) 4MB x 9 |
(4) 256KB x 9 |
|
20MB |
(4) 4MB x 9 |
(4) 1KB x 9 |
|
32MB |
(4) 4MB x 9 |
(4) 4MB x 9 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
32KB |
(4) 8K x 8 |
None |
(1) 8K x 8 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
None |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
JP22 |
JP23 |
JP25 |
JP26 |
|
32KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
64KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
128KB |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
256KB |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
CACHE JUMPER CONFIGURATION (CONT.) | ||||
|
Size |
JP27 |
JP28 |
JP29 |
JP30 |
|
32KB |
Closed |
Open |
Open |
Open |
|
64KB |
Open |
Closed |
Open |
Open |
|
128KB |
Open |
Open |
Closed |
Open |
|
256KB |
Open |
Open |
Open |
Closed |
|
CPU SPEED SELECTION | ||||
|
Speed |
JP3 |
JP7 |
JP9 |
JP13 |
|
25MHz |
2 & 3 |
Open |
2 & 3 |
2 & 3 |
|
33MHz |
1 & 2 |
1 & 2 |
1 & 2, 3 & 4 |
1 & 2 |
|
50MHz (DX) |
2 & 3 |
1 & 2 |
1 & 2, 3 & 4 |
1 & 2 |
|
50MHz (DX2) |
1 & 2 |
1 & 2 |
1 & 2, 3 & 4 |
1 & 2 |
|
66MHz |
1 & 2 |
1 & 2 |
1 & 2, 3 & 4 |
1 & 2 |