EVEREX SYSTEMS, INC.
STEP 286
| 
 Processor  | 
 80286  | 
| 
 Processor Speed  | 
 12/16MHz  | 
| 
 Chip Set  | 
 C & T  | 
| 
 Max. Onboard DRAM  | 
 4MB  | 
| 
 Cache  | 
 None  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 246mm x 216mm  | 
| 
 I/O Options  | 
 None  | 
| 
 NPU Options  | 
 80287  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Turbo LED  | 
 P1  | 
 Speaker  | 
 P4  | 
| 
 Turbo Switch  | 
 P2  | 
 Power LED & Keylock  | 
 P5  | 
| 
 Reset switch  | 
 P3  | ||
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| » | 
 Monitor type select monochrome  | 
 SW3  | 
 Closed  | 
| 
 Monitor type select color  | 
 SW3  | 
 Open  | |
| » | 
 DRAM access time 100ns  | 
 W2  | 
 Closed  | 
| 
 DRAM access time 70ns  | 
 W2  | 
 Open  | |
| » | 
 CPU select 0 wait states  | 
 W3  | 
 Closed  | 
| 
 CPU select 1 wait state  | 
 W3  | 
 Open  | |
| » | 
 Factory configured - do not alter  | 
 W4 - W11  | 
 N/A  | 
| » | 
 DRAM access time 80ns  | 
 W15  | 
 closed  | 
| 
 DRAM access time 60ns to 70ns  | 
 W15  | 
 open  | |
| 
 Note:On 12MHz board W2 controls DRAM access time and W15 must remain closed. On 16MHz board W15 controls DRAM access time and W2 must remain open.  | |||
| 
 DRAM CONFIGURATION  | ||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
| 
 512KB  | 
 (18) 41256  | 
 NONE  | 
| 
 1MB  | 
 (18) 41256  | 
 (18) 41256  | 
| 
 2MB  | 
 (18) 411000  | 
 NONE  | 
| 
 2.5MB  | 
 (18) 411000  | 
 (18) 41256  | 
| 
 4MB  | 
 (18) 411000  | 
 (18) 411000  | 
| 
 DRAM SWITCH CONFIGURATION  | |||
| 
 Size  | 
 SW2/2  | 
 SW2/3  | 
 SW2/4  | 
| 
 512KB  | 
 On  | 
 On  | 
 On  | 
| 
 1MB  | 
 On  | 
 On  | 
 Off  | 
| 
 2MB  | 
 Off  | 
 On  | 
 On  | 
| 
 2.5MB  | 
 On  | 
 Off  | 
 On  | 
| 
 4MB  | 
 On  | 
 On  | 
 On  | 
| 
 NPU SPEED CONFIGURATION  | ||
| 
 Speed  | 
 W12  | 
 W13  | 
| 
 5MHz or disabled  | 
 pins 2 & 3, 5 & 6 closed  | 
 pins 2 & 3, 5 & 6 closed  | 
| 
 8 or 10MHz  | 
 pins 1 & 2, 4 & 5 closed  | 
 pins 1 & 2, 4 & 5 closed  |