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.  | ||||