AMERICAN DIGITAL DATA ASSOCIATES
Precision 486-25
| 
 Processor  | 
 80486DX  | 
| 
 Processor Speed  | 
 25MHz  | 
| 
 Chip Set  | 
 OPTI  | 
| 
 Max. Onboard DRAM  | 
 32MB  | 
| 
 Cache  | 
 64/128KB (on 32-bit external cache card)  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 32-bit external memory card slot, 32-bit external cache card slot  | 
| 
 NPU Options  | 
 4167  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 External battery  | 
 BAT  | 
 Speaker  | 
 J25  | 
| 
 32-bit external memory card  | 
 CN1  | 
 Power LED & keylock  | 
 J26  | 
| 
 32-bit external cache card  | 
 CN2  | 
 Reset switch  | 
 SW1  | 
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| » | 
 Monitor type select color  | 
 JP1  | 
 Closed  | 
| 
 Monitor type select monochrome  | 
 JP1  | 
 Open  | |
| 
 DRAM CONFIGURATION  | ||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
| 
 1MB  | 
 (4) 256K x 9  | 
 NONE  | 
| 
 2MB  | 
 (4) 256K x 9  | 
 (4) 256K x 9  | 
| 
 4MB  | 
 (4) 1M x 9  | 
 NONE  | 
| 
 5MB  | 
 (4) 256K x 9  | 
 (4) 1M x 9  | 
| 
 8MB  | 
 (4) 1M x 9  | 
 (4) 1M x 9  | 
| 
 16MB  | 
 (4) 4M x 9  | 
 NONE  | 
| 
 17MB  | 
 (4) 256K x 9  | 
 (4) 4M x 9  | 
| 
 20MB  | 
 (4) 1M x 9  | 
 (4) 4M x 9  | 
| 
 32MB  | 
 (4) 4M x 9  | 
 (4) 4M x 9  | 
| 
 CACHE CARD CONFIGURATION  | ||
| 
 Setting  | 
 JP3  | 
 JP4  | 
| 
 Disabled  | 
 Closed  | 
 Closed  | 
| 
 Enabled  | 
 Open  | 
 Open  | 
| 
 CACHE CONFIGURATION  | ||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
| 
 64KB  | 
 (8) 8K x 8  | 
 NONE  | 
| 
 128KB  | 
 (8) 8K x 8  | 
 (8) 8K x 8  | 
| 
 CACHE JUMPER CONFIGURATION  | |||||
| 
 Size  | 
 JP1  | 
 JP2  | 
 JP3  | 
 JP4  | 
 JP5  | 
| 
 64KB  | 
 1 & 2  | 
 Open  | 
 Open  | 
 1 & 2  | 
 1 & 2  | 
| 
 128KB  | 
 2 & 3  | 
 Closed  | 
 Closed  | 
 2 & 3  | 
 2 & 3  | 
| 
 Note: Pins designated should be in the closed position.  | |||||