UNIDENTIFIED
SIS 486
Processor | CX486SX/80486SX/80487SX/CX486DX/80486DX/80486DX2 |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | SIS |
Max. Onboard DRAM | 64MB |
Cache | 128/256KB |
BIOS | AMI |
Dimensions | 254mm x 220mm |
I/O Options | 32-bit VESA local bus slots (3) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Auxiliary keyboard connector | CN1 | Turbo switch | JP22 pins 15 - 17 |
External battery | CN3 | Reset switch | JP22 pins 19 - 20 |
Power LED & keylock | JP22 pins 1 - 5 | Bus mouse port | JP22 pins 19 - 20 |
Speaker | JP22 pins 6 - 10 | 32-bit VESA local bus slots | SL1 - SL3 |
Turbo LED | JP22 pins 12 - 13 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Battery type select internal | CN3 | pins 2 & 3 closed |
Battery type select external | CN3 | Closed | |
» | Factory configured - do not alter | JGPC | N/A |
» | Monitor type select monochrome | JP1 | Open |
Monitor type select color | JP1 | Closed | |
» | PQFP CPU disabled | JP5 | Closed |
PQFP CPU enabled | JP5 | Open | |
» | CPU speed select 50MHz (Cyrix only) | JP6 | pins 1 & 2 closed |
CPU speed select <50MHz (Cyrix only) | JP6 | pins 2 & 3 closed | |
» | CPU type select all | JP16 | pins 2 & 3 closed |
CPU type select 80486DX-40/50 only | JP16 | pins 1 & 2 closed | |
» | VESA card select normal | JP23 | Open |
VESA card select Genoa | JP23 | Closed |
DRAM CONFIGURATION | |||
Size | Bank 0 | Bank 1 | Bank 2 |
4MB | (4) 256K x 9 | (1) 256K x 36 | (1) 512K x 36 |
4MB | NONE | (1) 512K x 36 | (1) 512K x 36 |
8MB | (4) 1M x 9 | (1) 512K x 36 | (1) 512K x 36 |
20MB | (4) 4M x 9 | (1) 512K x 36 | (1) 512K x 36 |
4MB | (4) 1M x 9 | NONE | NONE |
8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
16MB | NONE | (1) 4M x 36 | NONE |
16MB | (4) 4M x 9 | NONE | NONE |
32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
64MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
DRAM CONFIGURATION | |||
Size | JPA | JPB | JPC |
4MB | pins 1 & 2 closed | pins 4 & 5 closed | pins 1 & 2 closed |
4MB | pins 2 & 3 closed | Open | Open |
8MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
20MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
4MB | Open | Open | pins 2 & 3 closed |
8MB | pins 2 & 3 closed | Open | Open |
8MB | Open | pins 4 & 5 closed | pins 1 & 2 closed |
12MB | pins 1 & 2 closed | pins 4 & 5 closed | pins 1 & 2 closed |
16MB | Open | Open | Open |
16MB | Open | Open | pins 2 & 3 closed |
32MB | pins 2 & 3 closed | Open | Open |
64MB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
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 |
CACHE JUMPER CONFIGURATION | |||
Size | JP2 | JP3 | JP4 |
128KB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
256KB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
CPU TYPE CONFIGURATION | |||
Type | JP12 | JP13 | JP15 |
80486SX | Open | pins 2 & 3 closed | Open |
80487SX | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
CPU SPEED CONFIGURATION | |||
Speed | JS0 | JS1 | JS2 |
25MHz | Open | Open | Closed |
33MHz | Closed | Open | Open |
40MHz | Closed | Closed | Open |
50iMHz | Open | Open | Closed |
50MHz | Open | Closed | pins 1 & 2 closed |
66iMHz | Closed | Open | Open |
VESA WAIT STATE CONFIGURATION | |
Wait states | JP8 |
0 wait states | pins 1 & 2 closed |
1 wait state | pins 2 & 3 closed |
BUS SPEED CONFIGURATION | |
CPU speed | JP9 |
<= 33MHz | pins 1 & 2 closed |
> 33MHz | pins 2 & 3 closed |