SOYO COMPUTER CO., LTD.
486 MAINBOARD
|
Processor |
80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
20/25/33/50/66(internal)MHz |
|
Chip Set |
ETEQ |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
240mm x 220mm |
|
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 | |
|
Monitor type select monochrome |
JP3 |
Open | |
|
Monitor type select color |
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 |
|
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 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 |
JP21 |
JP22 |
JP23 |
JP24 |
JP25 |
JP26 |
JP27 |
|
64KB |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
2 & 3 |
|
128KB |
1 & 2 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||||
|
CPU TYPE CONFIGURATION | |||||
|
Type |
Crystal OSC1 |
JP9 |
JP11 |
JP12 |
JP13 |
|
80486SX-20MHz |
40MHz |
2 & 3 |
Open |
2 & 3 |
2 & 3 |
|
80486SX-25MHz |
25MHz |
1 & 2 |
Open |
2 & 3 |
2 & 3 |
|
80487SX-20MHz |
40MHz |
2 & 3 |
Closed |
2 & 3 |
1 & 2 |
|
80486DX-25MHz |
25MHz |
1 & 2 |
Closed |
1 & 2 |
1 & 2 |
|
80486DX-33MHz |
33MHz |
1 & 2 |
Closed |
1 & 2 |
1 & 2 |
|
80486DX-50MHz |
50MHz |
1 & 2 |
Closed |
1 & 2 |
1 & 2 |
|
80486DX2-50MHz |
33MHz |
1 & 2 |
Closed |
1 & 2 |
1 & 2 |
|
80486DX2-66MHz |
33MHz |
1 & 2 |
Closed |
1 & 2 |
1 & 2 |
|
Note: Pins designated should be in the closed position. | |||||