CHAINTECH COMPUTER COMPANY, LTD.
VESA MAINBOARD SIS 486 (REV. 2)
|
Processor |
80486SX/CX486M7/80486DX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
SIS |
|
Max. Onboard DRAM |
128MB |
|
Cache |
128/256/512KB |
|
BIOS |
AMI/Award |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit VESA local bus slots (3), green PC connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J1 |
Reset switch |
J6 |
|
Turbo switch |
J3 |
Power LED & keylock |
J7 |
|
Turbo LED |
J4 |
Green PC connector |
JP26 |
|
Speaker |
J5 |
32-bit VESA local bus slots |
SL1 - SL3 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
SMOUT type select normal mode |
J2 |
Closed |
|
SMOUT type select standby mode |
J2 |
Open | |
|
|
CMOS memory normal operation |
JP16 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP16 |
pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP18 |
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 |
|
65MB |
(4) 256K x 9 |
(4) 16M x 9 |
|
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 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
512KB |
(4) 128K x 8 |
NONE |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
JP1 |
JP2 |
JP3 |
JP4 |
|
128KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2, 3 & 4 closed |
pins 1 & 2 closed |
|
256KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3, 4 & 5 closed |
pins 1 & 2 closed |
|
512KB |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2, 3 & 4 closed |
pins 2 & 3 closed |
|
CPU TYPE CONFIGURATION | |||||||
|
Type |
JP8 |
JP9 |
JP10 |
JP11 |
JP12 |
JP13 |
JP14 |
|
80486SX |
2 & 3 |
Open |
2 & 3 |
Open |
3 & 4 |
1 & 2 |
2 & 3 |
|
CX486M7 |
1 & 2 |
Closed |
2 & 3 |
2 & 3 |
2 & 3 |
Open |
1 & 2 |
|
80486DX/DX2 |
1 & 2 |
Closed |
2 & 3 |
2 & 3 |
3 & 4 |
1 & 2 |
2 & 3 |
|
P23S |
2 & 3 |
Open |
2 & 3 |
Open |
3 & 4 |
1 & 2 |
2 & 3 |
|
P24D |
1 & 2 |
Closed |
1 & 2 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
|
P24S |
1 & 2 |
Closed |
2 & 3 |
2 & 3 |
3 & 4 |
1 & 2 |
2 & 3 |
|
P24T |
1 & 2 |
Closed |
1 & 2 |
1 & 2 |
3 & 4 |
Open |
1 & 2 |
|
Note: Pins designated should be in the closed position. | |||||||
|
CPU TYPE CONFIGURATION (CONT) | ||||||
|
Type |
JP15 |
JP21 |
JP22 |
JP24 |
JP25 |
JP30 |
|
80486SX |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
Open |
|
CX486M7 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
Open |
|
80486DX/DX2 |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
Open |
|
P23S |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
Open |
|
P24D |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
1 & 2 |
Closed |
|
P24S |
4 & 5 |
2 & 3 |
1 & 2 |
Open |
Open |
Open |
|
P24T |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
|
Note: Pins designated should be in the closed position. | ||||||
|
CPU SPEED CONFIGURATION | |||
|
Speed |
JP5 |
JP6 |
JP7 |
|
25MHz |
Open |
Closed |
Open |
|
33MHz |
Closed |
Closed |
Closed |
|
40MHz |
Open |
Closed |
Closed |
|
50iMHz |
Open |
Closed |
Open |
|
50MHz |
Closed |
Open |
Open |
|
66iMHz |
Closed |
Closed |
Closed |
|
CPU CLOCK DELAY CONFIGURATION | |
|
Delay |
JP20 |
|
0 delay |
pins 1 & 2 closed |
|
1 gate buffer delay |
pins 2 & 3 closed |
|
CPU INPUT FREQUENCY CONFIGURATION | |
|
input |
JP23 |
|
Single input |
pins 1 & 2 closed |
|
Double input |
pins 2 & 3 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 |