UNIDENTIFIED
A486SX/DX
Processor | 80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 25/33/50(internal)/50/66(internal)MHz |
Chip Set | ALI |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 254mm x 220mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | JP10 | Power LED & keylock | JP21 |
Reset switch | JP17 | Turbo switch | JP22 |
Speaker | JP20 | Turbo LED | JP23 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select color | JP4 | pins 2 & 3 closed |
Monitor type select monochrome | JP4 | Open | |
» | Factory configured - do not alter | JP6 | N/A |
» | Battery type select DS1287 | JP11 | Closed |
Battery type select 146818 | JP11 | Open | |
» | Clock input select 2x | JP12 | pins 1 & 2 closed |
Clock input select 1x | JP12 | pins 2 & 3 closed | |
» | Parity check enabled | JP13 | pins 1 & 2 closed |
Parity check disabled | JP13 | pins 2 & 3 closed | |
» | Factory configured - do not alter | JP18 | N/A |
» | PQFP CPU disabled | JP29 | Closed |
PQFP CPU enabled | JP29 | 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 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CACHE CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | TAG (U9) | TAG (U11) |
64KB | (4) 8K x 8 | (4) 8K x 8 | NONE | (1) 8K x 8 |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
128KB | (4) 32K x 8 | NONE | NONE | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 8K x 8 | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | NONE | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||||||||
Size | JP5 | JP7 | JP8 | JP9 | JP24 | JP25 | JP26 | JP27 | JP28 |
64KB | 1 & 2 | 1 & 2 | 1 & 2 | Open | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
64KB | 1 & 2 | 1 & 2 | Open | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
128KB | 2 & 3 | 1 & 2 | 1 & 2 | Open | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
256KB | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
256KB | 1 & 2 | 2 & 3 | 1 & 2 | Open | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
Note: Pins designated should be in the closed position. |
CPU TYPE CONFIGURATION | |||
Type | JP14 | JP15 | JP16 |
80486SX | pins 1 & 2 closed | pins 1 & 2 closed | Open |
80487SX | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
80486DX | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
80486DX2 | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |