UNIDENTIFIED
80486
| 
 Processor  | 
 80486SX/80487SX/ODP486SX/80486DX/80486DX2  | 
| 
 Processor Speed  | 
 20/25/33/40/50(internal)/66(internal)MHz  | 
| 
 Chip Set  | 
 OPTI  | 
| 
 Max. Onboard DRAM  | 
 32MB  | 
| 
 Cache  | 
 None  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 254mm x 218mm  | 
| 
 I/O Options  | 
 None  | 
| 
 NPU Options  | 
 None  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Power LED & keylock  | 
 J17  | 
 External battery  | 
 J20  | 
| 
 Speaker  | 
 J18  | 
 Turbo switch  | 
 J21  | 
| 
 Reset switch  | 
 J19  | 
 Turbo LED  | 
 J22  | 
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| 
 »  | 
 CPU type select PGA or PQFP installed  | 
 J23  | 
 Open  | 
| 
 CPU type select PQFP disabled & PGA enabled  | 
 J23  | 
 Closed  | |
| 
 »  | 
 Monitor type select monochrome  | 
 JP3  | 
 Open  | 
| 
 Monitor type select color/EGA/VGA  | 
 JP3  | 
 Closed  | |
| 
 »  | 
 CMOS memory normal operation  | 
 JP5  | 
 pins 1 & 2 closed  | 
| 
 CMOS memory clear  | 
 JP5  | 
 pins 2 & 3 closed  | |
| 
 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  | 
| 
 32MB  | 
 (4) 4M x 9  | 
 (4) 4M x 9  | 
| 
 CPU TYPE CONFIGURATION  | ||||
| 
 Type  | 
 JP101  | 
 JP102  | 
 JP103  | 
 JP104  | 
| 
 80486SX  | 
 Open  | 
 pins 2 & 3 closed  | 
 Open  | 
 pins 2 & 3 closed  | 
| 
 80487SX  | 
 Closed  | 
 pins 1 & 2 closed  | 
 pins 2 & 3 closed  | 
 pins 2 & 3 closed  | 
| 
 ODP486SX  | 
 Closed  | 
 pins 1 & 2 closed  | 
 pins 2 & 3 closed  | 
 pins 2 & 3 closed  | 
| 
 80486DX/DX2  | 
 Closed  | 
 pins 1 & 2 closed  | 
 pins 1 & 2 closed  | 
 pins 2 & 3 closed  | 
| 
 CPU SPEED CONFIGURATION  | |||
| 
 Speed  | 
 J24  | 
 J25  | 
 J26  | 
| 
 20MHz  | 
 Open  | 
 Closed  | 
 Closed  | 
| 
 25MHz  | 
 Closed  | 
 Open  | 
 Closed  | 
| 
 33MHz  | 
 Closed  | 
 Closed  | 
 Open  | 
| 
 50iMHz  | 
 Closed  | 
 Open  | 
 Closed  | 
| 
 66iMHz  | 
 Closed  | 
 Closed  | 
 Open  |