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 |