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 |