SOYO COMPUTER CO., LTD.
486 VESA MAINBOARD
|
Processor |
CX486S/80486SX/CX486S2/80487SX/CX486DX/80486DX/CX486DX2/ 80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
ALI |
|
Max. Onboard DRAM |
128MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
254mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (2) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Power LED & keylock |
J17 |
Turbo switch |
J21 |
|
Speaker |
J18 |
Turbo LED |
J22 |
|
Reset switch |
J19 |
32-bit VESA local bus slots |
SL1 & SL2 |
|
External battery |
J20 | ||
|
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 | |
|
» |
Factory configured - do not alter |
JP18 |
Open |
|
» |
Factory configured - do not alter |
JP19 |
Open |
|
» |
Battery type select internal |
JP20 |
pins 1 & 2 closed |
|
Battery type select external |
JP20 |
pins 2 & 3 closed | |
|
» |
CPU type select PGA |
JP30 |
Closed |
|
CPU type select PQFP |
JP30 |
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 |
JP16 |
JP22 |
JP23 |
|
64KB |
N/A |
N/A |
N/A |
|
128KB |
N/A |
N/A |
N/A |
|
256KB |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
Note: The jumper settings for 64KB & 128KB are unavailable from manufacturer. | |||
|
CPU TYPE CONFIGURATION | ||||||
|
Type |
JP1 |
JP6 |
JP7 |
JP8 |
JP9 |
JP10 |
|
CX486S |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
Open |
Open |
|
80486SX |
1 & 2 |
1 & 2 |
Open |
1 & 2 |
Closed |
Closed |
|
CX486S2 |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
Open |
Open |
|
80487SX |
1 & 2 |
1 & 2 |
Open |
2 & 3 |
Closed |
Closed |
|
CX486DX |
1 & 2 |
1 & 2 |
Open |
2 & 3 |
Closed |
Closed |
|
CX486DX2 |
1 & 2 |
1 & 2 |
Open |
2 & 3 |
Closed |
Closed |
|
80486DX/DX2 |
1 & 2 |
1 & 2 |
Open |
2 & 3 |
Closed |
Closed |
|
Pentium Overdrive |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
Closed |
Closed |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU TYPE CONFIGURATION (CON’T) | ||||||
|
Type |
JP11 |
JP12 |
JP13 |
JP14 |
JP17 |
JP31 |
|
CX486S |
3 & 4 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
Open |
|
80486SX |
Open |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
|
CX486S2 |
3 & 4 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
Closed |
|
80487SX |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
|
CX486DX |
2 & 3 |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
Open |
|
CX486DX2 |
2 & 3 |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
Closed |
|
80486DX/DX2 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
|
Pentium Overdrive |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
Open |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU SPEED CONFIGURATION | ||||
|
Speed |
JP24 |
JP25 |
JP26 |
JP27 |
|
25MHz |
Open |
Open |
Closed |
Open |
|
33MHz |
Closed |
Open |
Closed |
Closed |
|
40MHz |
Open |
Closed |
Open |
Open |
|
50iMHz |
Open |
Open |
Closed |
Open |
|
50MHz |
Open |
Open |
Closed |
Open |
|
66iMHz |
Closed |
Open |
Closed |
Closed |
|
CPU CLOCK SPEED CONFIGURATION | |||
|
Speed |
JP15 |
JP21 |
JP33 |
|
25MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
33MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
40MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
50iMHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
50MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
66iMHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
VESA WAIT STATE CONFIGURATION | |
|
Wait states |
JP28 |
|
0 wait states |
pins 1 & 2 closed |
|
1 wait state |
pins 2 & 3 closed |
|
BUS SPEED CONFIGURATION | |
|
CPU speed |
JP29 |
|
<= 33MHz |
pins 1 & 2 closed |
|
> 33MHz |
pins 2 & 3 closed |