AMERICAN MEGATRENDS, INC.
386 AT MARK II SYSTEM MOTHERBOARD
|
Processor |
80386 |
|
Processor Speed |
16/20/25/33MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
16MB (8MB on external memory card) |
|
Maximum Video Memory |
None |
|
Cache |
None |
|
BIOS |
AMI |
|
Dimensions |
355mm x 304mm |
|
I/O Options |
External memory card |
|
NPU Options |
80387/3167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo LED |
J1 |
Power LED & keylock |
J8 |
|
Reset switch |
J2 |
External battery |
J9 |
|
Speaker |
J7 |
External memory card |
SL1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Factory configured - do not alter |
J26 |
Unidentified |
|
Factory configured - do not alter |
SW/1 |
Off | |
|
Monitor type select color |
SW/2 |
On | |
|
Monitor type select monochrome |
SW/2 |
Off | |
|
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 |
|
Note: Board will accept 441000 chips but the configuration was not available. | ||
|
DRAM JUMPER CONFIGURATION | ||
|
Bank 0 chips |
Bank 1 chips |
J27 |
|
Installed |
Not installed |
Pins 1 & 2, 3 & 4 closed |
|
Not installed |
Installed |
Pins 2 & 3, 4 & 5 closed |
|
41256 |
256K/1M |
Pins 1 & 2, 3 & 4 closed |
|
411000 |
256K/1M |
Pins 2 & 3, 4 & 5 closed |
|
441000 |
Any chip type |
Pins 1 & 2, 3 & 4 closed |
|
Any chip type |
4M |
Pins 2 & 3, 4 & 5 closed |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 2 |
Bank 3 |
|
8MB |
(18) 411000 |
(18) 411000 |
|
DRAM SWITCH CONFIGURATION | ||||
|
Mark II memory |
BASE board memory |
SW/1 |
SW/2 |
SW/3 |
|
640KB |
1 bank |
Off |
On |
On |
|
896KB |
2 banks |
On |
On |
On |
|
1664KB |
1 bank |
Off |
Off |
On |
|
1920KB |
2 banks |
On |
Off |
On |
|
3712KB |
1 bank |
Off |
On |
On |
|
3968KB |
2 banks |
On |
On |
On |
|
4736KB |
1 bank |
Off |
On |
Off |
|
4992KB |
2 banks |
On |
On |
Off |
|
7808KB |
1 bank |
Off |
Off |
On |
|
8064KB |
2 banks |
On |
Off |
On |
|
N/A* |
2 banks |
On |
Off |
Off |
|
Note: * = Memory configuration in the 14MB & 15MB region is enabled. For all other configurations, the region is disabled. | ||||