FIRST INTERNATIONAL COMPUTER, INC.
486SX-20 & DX-25/33 SC (REV. D)
|
Processor |
80486SX/80486DX |
|
Processor Speed |
20/25/33MHz |
|
Chip Set |
Symphony |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/128/256/1024KB |
|
BIOS |
AMI/MR/Phoenix |
|
Dimensions |
355mm x 304mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Speaker |
JP1 |
Turbo switch |
JP10 |
|
Reset switch |
JP2 |
Turbo LED |
JP11 |
|
Power LED & keylock |
JP5 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Factory configured - do not alter |
JP3 |
pins 2 & 3 closed | |
|
Monitor type select monochrome |
JP6 |
Open | |
|
Monitor type select color |
JP6 |
Closed | |
|
CPU speed select iOSC/1 |
JP27 |
Closed | |
|
CPU speed select iOSC/2 |
JP27 |
Open | |
|
Cache write select 0 wait states |
JP32 |
Closed | |
|
Cache write select 1 wait state |
JP32 |
Open | |
|
Factory configured - do not alter |
JP33 |
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 |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
17MB |
(4) 256K x 9 |
(4) 4M x 9 |
|
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) 32K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
1024KB |
(4) 128K x 8 |
(4) 128K x 8 |
(1) 128K x 8 |
|
CACHE JUMPER CONFIGURATION (CONT) | |||||
|
Size |
JP22 |
JP23 |
JP24 |
JP25 |
JP26 |
|
64KB |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
Open |
|
128KB |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
Closed |
|
256KB |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
Open |
|
1MB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
Open |
|
Note: Pins designated should be in the closed position. | |||||
|
CACHE JUMPER CONFIGURATION (CONT) | |||||
|
Size |
JP28 |
JP34 |
JP35 |
JP36 |
JP37 |
|
64KB |
Closed |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
|
128KB |
Open |
Open |
1 & 2 |
1 & 2 |
1 & 2 |
|
256KB |
Closed |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
1MB |
Closed |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||
|
CACHE JUMPER CONFIGURATION (CONT) | |||||
|
Size |
JP38 |
JP39 |
JP40 |
JP41 |
JP42 |
|
64KB |
Open |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
|
128KB |
Closed |
Open |
1 & 2 |
Closed |
2 & 3 |
|
256KB |
Open |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
|
1MB |
Open |
2 & 3 |
2 & 3 |
Open |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP12 |
JP13 |
JP14 |
|
80486SX |
Open |
pins 2 & 3 closed |
Open |
|
80486DX |
Closed |
pins 1 & 2 closed |
Closed |