AMERICAN MEGATRENDS, INC.
286 MOTHERBOARD
| 
 Processor  | 
 80286  | 
| 
 Processor Speed  | 
 8/10/12MHz  | 
| 
 Chip Set  | 
 Unidentified  | 
| 
 Video Chip Set  | 
 None  | 
| 
 Maximum Onboard Memory  | 
 1MB  | 
| 
 Maximum Video Memory  | 
 None  | 
| 
 Cache  | 
 None  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 None  | 
| 
 NPU Options  | 
 80287  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Speaker  | 
 J24  | 
 Reset switch  | 
 J29 pins 1 & 2  | 
| 
 Power LED & keylock  | 
 J26  | 
 Turbo LED  | 
 J29 pins 3 & 4  | 
| 
 Reset switch  | 
 J28  | ||
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Label  | 
 Position  | |
| 
 »  | 
 Factory configured - do not alter  | 
 J15  | 
 Unidentified  | 
| 
 ROM wait state select 2 wait states  | 
 J17  | 
 Closed  | |
| 
 ROM wait state select 1 wait state  | 
 J17  | 
 Open  | |
| 
 Monitor type select color  | 
 J23  | 
 Closed  | |
| 
 Monitor type select monochrome  | 
 J23  | 
 Open  | |
| 
 I/O wait state enabled  | 
 J27  | 
 Closed  | |
| 
 I/O wait state disabled  | 
 J27  | 
 Open  | |
| 
 DRAM CONFIGURATION  | ||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
| 
 512KB  | 
 (18) 41256  | 
 None  | 
| 
 640KB  | 
 (18) 41256  | 
 (18) 4164  | 
| 
 1MB  | 
 (18) 41256  | 
 (18) 41256  | 
| 
 Note: The location of banks 0 & 1 are unidentified.  | ||
| 
 DRAM JUMPER CONFIGURATION  | ||
| 
 Size  | 
 J21  | 
 J22  | 
| 
 512KB  | 
 Closed  | 
 Closed  | 
| 
 640KB  | 
 Open  | 
 Closed  | 
| 
 1MB  | 
 Closed  | 
 Open  | 
| 
 RAM WAIT STATE SELECTION  | ||
| 
 Wait state  | 
 J16  | 
 J18  | 
| 
 0  | 
 Open  | 
 Closed  | 
| 
 1  | 
 Closed  | 
 Open  | 
| 
 BIOS SELECTION  | ||
| 
 Type  | 
 J30  | 
 J31  | 
| 
 27128  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
| 
 27256  | 
 Open  | 
 Pins 1 & 2 closed  | 
| 
 27512  | 
 Pins 2 & 3 closed  | 
 Pins 2 & 3 closed  |