486 VESA Motherboard Settings and Configuration
SOYO COMPUTER CO., LTD.
486 VESA
Processor | 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | SIS |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 230mm x 218mm |
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 |
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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 |
» | Factory configured - do not alter | JP6 | 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 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
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 | JP14 | JP15 | JP21 |
64KB | pins 1 & 2 closed | Open | pins 2 & 3 closed |
128KB | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed |
256KB | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
CPU TYPE CONFIGURATION | ||||
Type | JP8 | JP9 | JP12 | JP13 |
80486SX (PQFP) | Open | Open | Open | pins 2 & 3 closed |
80486SX (PGA) | Open | Closed | Open | pins 2 & 3 closed |
80487SX | Closed | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
80846DX/DX2 | Closed | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
Overdrive | Closed | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
CPU SPEED CONFIGURATION | |||
Speed | JP16 | JP17 | JP18 |
25MHz | Closed | Open | Closed |
33MHz | Open | Closed | Closed |
40MHz | Closed | Open | Open |
50iMHz | Closed | Open | Closed |
50MHz | Open | Closed | Open |
66iMHz | Open | Closed | Closed |
VESA WAIT STATE/BUS SPEED CONFIGURATION | |||
CPU speed | Wait states | JP19 | JP20 |
£ 33MHz | 0 wait states | pins 1 & 2 closed | pins 1 & 2 closed |
> 33MHz | 1 wait state | pins 2 & 3 closed | pins 2 & 3 closed |
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