486SCSL/486SCSI Motherboard Settings and Configuration
CHAINTECH COMPUTER COMPANY, LTD.
486SCSL/486SCSI
Processor | CX486S/CX486S & CX487S/80486SX/80487SX/AMD486DX/80486DX/ ODP486SX/ 80486DX2 |
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 | 265mm x 220mm |
I/O Options | 32-bit VESA local bus slots (2) (486SCSL only) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Power LED & keylock | J5 |
Turbo LED | J2 | Reset switch | J6 |
Turbo switch | J3 | 32-bit VESA local bus slots | SL1 & SL2 |
Speaker | J4 |
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USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Turbo switch select low | J3 | Open |
| Turbo switch select high | J3 | Closed |
» | CMOS memory normal operation | JP12 | Pins 1 & 2 closed |
| CMOS memory clear | JP12 | Pins 2 & 3 closed |
» | PQFP CPU disabled | JP16 | Closed |
| PQFP CPU enabled | JP16 | 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 |
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) 16K x 8 or (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||||||
Size | JP1 | JP2 | JP3 | JP4 | JP5 | JP6 | JP7 |
64KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | Open | 1 & 2 |
128KB | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
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 | JP13 | JP14 | JP15 |
CX486S | Open | Pins 2 & 3 closed | Open |
CX486S & CX487S | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
80486SX (PQFP) | Open | Pins 2 & 3 closed | Open |
80486SX (PGA) | Open | Pins 2 & 3 closed | Open |
ODP486SX | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
80487SX | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
AMD486DX | Pins 1 & 2 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 | JP20 | JP21 | JP22 |
25MHz | Closed | Open | Open |
33MHz | Open | Open | Closed |
40MHz | Open | Closed | Closed |
50iMHz | Closed | Open | Open |
50MHz | Open | Closed | Open |
66iMHz | Open | Open | Closed |
VESA WAIT STATE CONFIGURATION (SCSL ONLY) | |
Wait states | JP9/11 |
0 wait states | Pins 1 & 2 closed |
1 wait state | Pins 2 & 3 closed |
BUS SPEED CONFIGURATION (SCSL ONLY) | |
CPU speed | JP8/10 |
<= 33MHz | Pins 1 & 2 closed |
> 33MHz | Pins 2 & 3 closed |
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