UNIDENTIFIED
5/486 MOTHERBOARD
| 
 Processor  | 
 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive  | 
| 
 Processor Speed  | 
 25/33/40/50(internal)/50/66(internal)MHz  | 
| 
 Chip Set  | 
 Unknown  | 
| 
 Max. Onboard DRAM  | 
 128MB  | 
| 
 Cache  | 
 128/256KB  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 32-bit VESA local bus slots (3)  | 
| 
 NPU Options  | 
 None  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 External battery  | 
 J2  | 
 Power LED & keylock  | 
 JP123  | 
| 
 Reset switch  | 
 JP119  | 
 32-bit memory expansion slot  | 
 S1  | 
| 
 Turbo switch  | 
 JP120  | 
 32-bit memory expansion slot  | 
 S2  | 
| 
 Turbo LED  | 
 JP121  | 
 32-bit memory expansion slot  | 
 S3  | 
| 
 Speaker  | 
 JP122  | ||
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| 
 »  | 
 Monitor type select color  | 
 JP31  | 
 Closed  | 
| 
 Monitor type select monochrome  | 
 JP31  | 
 Open  | |
| 
 »  | 
 CMOS memory normal operation  | 
 JP33  | 
 pins 1 & 2 closed  | 
| 
 CMOS memory clear  | 
 JP33  | 
 pins 2 & 3 closed  | |
| 
 »  | 
 VESA clock normal  | 
 JP118  | 
 pins 1 & 2 closed  | 
| 
 VESA clock adjusted  | 
 JP118  | 
 pins 2 & 3 closed  | |
| 
 CPU SPEED  | |||
| 
 Speed  | 
 JP34  | 
 JP35  | 
 JP36  | 
| 
 25MHz  | 
 Closed  | 
 Open  | 
 Closed  | 
| 
 33MHz  | 
 Closed  | 
 Closed  | 
 Open  | 
| 
 40MHz  | 
 Open  | 
 Open  | 
 Closed  | 
| 
 50iMHz  | 
 Closed  | 
 Open  | 
 Closed  | 
| 
 50MHz  | 
 Open  | 
 Closed  | 
 Open  | 
| 
 66iMHz  | 
 Closed  | 
 Closed  | 
 Open  | 
| 
 CPU TYPE CONFIGURATION  | |
| 
 Type  | 
 JP30  | 
| 
 80486SX  | 
 pins 5 & 6 closed  | 
| 
 80487SX  | 
 pins 1 & 2, 4 & 5, 6 & 7 closed  | 
| 
 80486DX  | 
 pins 2 & 3, 4 & 5, 6 & 7 closed  | 
| 
 80486DX2  | 
 pins 2 & 3, 4 & 5, 6 & 7 closed  | 
| 
 Pentium Overdrive  | 
 pins 1 & 2, 4 & 5, 6 & 7 closed  | 
| 
 CACHE CONFIGURATION  | ||||
| 
 Size  | 
 U51, U52, U53, U54  | 
 U55, U56, U57, U58  | 
 TAG  | 
 JP58  | 
| 
 128KB  | 
 (4) 32K x 8  | 
 NONE  | 
 (1) 8K x 8  | 
 Pins 1 & 2 closed  | 
| 
 256KB  | 
 (4) 32K x 8  | 
 (4) 32K x 8  | 
 (1) 32K x 8  | 
 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) 1M x 9  | 
 (4) 256K x 9  | 
| 
 8MB  | 
 (4) 1M x 9  | 
 (4) 1M x 9  | 
| 
 16MB  | 
 (4) 4M x 9  | 
 NONE  | 
| 
 17MB  | 
 (4) 4M x 9  | 
 (4) 256K x 9  | 
| 
 20MB  | 
 (4) 4M x 9  | 
 (4) 1M x 9  | 
| 
 32MB  | 
 (4) 4M x 9  | 
 (4) 4M x 9  | 
| 
 64MB  | 
 (4) 16M x 9  | 
 NONE  | 
| 
 65MB  | 
 (4) 16M x 9  | 
 (4) 256K x 9  | 
| 
 68MB  | 
 (4) 16M x 9  | 
 (4) 1M x 9  | 
| 
 80MB  | 
 (4) 16M x 9  | 
 (4) 4M x 9  | 
| 
 128MB  | 
 (4) 16M x 9  | 
 (4) 16M x 9  |