AMERICAN MEGATRENDS, INC.
486 GEMINI
|
Processor |
80486DX |
|
Processor Speed |
25/33MHz |
|
Chip Set |
C & T |
|
Max. Onboard DRAM |
20MB |
|
Cache |
64KB |
|
BIOS |
AMI |
|
Dimensions |
355.6mm x 304mm |
|
I/O Options |
32-bit external memory card slot |
|
NPU Options |
3167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo LED |
J1 |
Power LED & keylock |
J8 |
|
Reset switch |
J2 |
External battery |
J9 |
|
Speaker |
J7 |
32-bit external memory card |
S1 |
|
USER CONFIGURABLE SETTINGS | ||||
|
Function |
Switch |
Position | ||
|
Factory configured - do not alter |
SW1/1 |
Off | ||
|
Monitor type select monochrome |
SW1/2 |
Off | ||
|
Monitor type select color |
SW1/2 |
On | ||
|
Note : Cache is factory installed and is not configurable. The size and location of cache and tag are unidentified. | ||||
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(36) 41256 |
NONE |
|
1MB |
NONE |
(4) 256K x 9 |
|
2MB |
(36) 41256 |
(4) 256K x 9 |
|
4MB |
(36) 411000 |
NONE |
|
4MB |
NONE |
(4) 1M x 9 |
|
5MB |
(36) 41256 |
(4) 1M x 9 |
|
5MB |
(36) 411000 |
(4) 256K x 9 |
|
8MB |
(36) 411000 |
(4) 1M x 9 |
|
16MB |
NONE |
(4) 4M x 9 |
|
17MB |
(36) 41256 |
(4) 4M x 9 |
|
20MB |
(36) 411000 |
(4) 4M x 9 |
|
Note : There were two versions of this board made, one that had 1MB of DIPP DRAM installed and one that had 4MB of DIPP DRAM installed. The 1MB version could be upgraded by the factory to support 4MB of DIPP DRAM. | ||
|
DRAM JUMPER CONFIGURATION | ||
|
Size |
J26 |
J27 |
|
1MB |
Open |
pins 1 & 2 and 3 & 4 closed |
|
1MB |
Open |
pins 2 & 3 and 4 & 5 closed |
|
2MB |
Open |
pins 1 & 2 and 3 & 4 closed |
|
4MB |
Open |
pins 1 & 2 and 3 & 4 closed |
|
4MB |
Open |
pins 2 & 3 and 4 & 5 closed |
|
5MB |
Open |
pins 1 & 2 and 3 & 4 closed |
|
5MB |
Open |
pins 2 & 3 and 4 & 5 closed |
|
8MB |
Open |
pins 2 & 3 and 4 & 5 closed |
|
16MB |
pins 1 & 2 closed |
pins 2 & 3 and 4 & 5 closed |
|
17MB |
pins 1 & 2 closed |
pins 1 & 2 and 3 & 4 closed |
|
20MB |
pins 1 & 2 closed |
pins 1 & 2 and 3 & 4 closed |