SOYO COMPUTER CO., LTD.
486 VESA GREEN MAINBOARD
|
Processor |
CX486S/80486SX/CX486DX/80486DX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
128MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
254mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (2), green PC connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Green PC connector |
J4 |
Turbo switch |
J21 |
|
Power LED & keylock |
J17 |
Turbo LED |
J22 |
|
Speaker |
J18 |
Green PC connector |
JP28 |
|
Reset switch |
J19 |
Green PC connector |
JP34 |
|
External battery |
J20 |
32-bit VESA local bus slots |
SL1 & SL2 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
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 | |
|
|
CPU type select PGA |
JP18 |
Closed |
|
CPU type select PQFP |
JP18 |
Open | |
|
|
Factory configured - do not alter |
JP23 |
Open |
|
|
Factory configured - do not alter |
JP31 |
Open |
|
|
Factory configured - do not alter |
JP32 |
Open |
|
|
Factory configured - do not alter |
JP35 |
Open |
|
|
Factory configured - do not alter |
JP36 |
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 |
|
64MB |
(4) 16M x 9 |
NONE |
|
68MB |
(4) 1M x 9 |
(4) 16M x 9 |
|
80MB |
(4) 4M x 9 |
(4) 16M x 9 |
|
128MB |
(4) 16M x 9 |
(4) 16M x 9 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |||
|
Size |
JP24 |
JP25 |
JP26 |
|
64KB |
Open |
pins 1 & 2 closed |
Open |
|
128KB |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
256KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
CPU TYPE CONFIGURATION | |||||
|
Type |
JP1 |
JP4 |
JP6 |
JP8 |
JP9 |
|
CX486SX |
1 & 2 |
2 & 3 |
Open |
Open |
2 & 3 |
|
80486SX |
2 & 3 |
1 & 2 |
Closed |
Open |
2 & 3 |
|
CX486DX |
1 & 2 |
2 & 3 |
Open |
Closed |
1 & 2 |
|
80486DX |
2 & 3 |
1 & 2 |
Closed |
Closed |
1 & 2 |
|
80486DX2 |
2 & 3 |
1 & 2 |
Closed |
Closed |
1 & 2 |
|
Pentium Overdrive |
1 & 2 |
1 & 2 |
Open |
Closed |
1 & 2 |
|
Note: Pins designated should be in the closed position. | |||||
|
CPU TYPE CONFIGURATION (CONT) | ||||
|
Type |
JP10 |
JP11 |
JP12 |
JP13 |
|
CX486SX |
2 & 3 |
2 & 3 |
2 & 3 |
Open |
|
80486SX |
4 & 5 |
Open |
Open |
Open |
|
CX486DX |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
80486DX |
4 & 5 |
Open |
Open |
Open |
|
80486DX2 |
4 & 5 |
Open |
Open |
Open |
|
Pentium Overdrive |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
|
Note: Pins designated should be in the closed position. | ||||
|
CPU TYPE CONFIGURATION (CONT) | ||||
|
Type |
JP16 |
JP17 |
JP29 |
JP33 |
|
CX486SX |
1 & 2, 3 & 4 |
1 & 2, 3 & 4 |
2 & 3 |
2 & 3 |
|
80486SX |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
|
CX486DX |
1 & 2, 3 & 4 |
1 & 2, 3 & 4 |
1 & 2 |
2 & 3 |
|
80486DX |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
|
80486DX2 |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
|
Pentium Overdrive |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
|
Note: Pins designated should be in the closed position. | ||||
|
CPU SPEED CONFIGURATION | |||
|
Speed |
JP20 |
JP21 |
JP22 |
|
25MHz |
Closed |
Open |
Closed |
|
33MHz |
Open |
Closed |
Closed |
|
40MHz |
Closed |
Open |
Open |
|
50MHz |
Open |
Closed |
Open |
|
50MHz (Pentium Overdrive only) |
Closed |
Open |
Closed |
|
50iMHz |
Closed |
Open |
Closed |
|
66iMHz |
Open |
Closed |
Closed |