FIRST INTERNATIONAL COMPUTER, INC.
486-20/25/33/50SC (REV. A)
|
Processor |
80486SX/80486DX |
|
Processor Speed |
20/25/33/50MHz |
|
Chip Set |
Symphony |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/128/256/1024KB |
|
BIOS |
AMI |
|
Dimensions |
330.2mm x 218.4mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo switch |
JP12 |
Speaker |
JP18 |
|
Turbo LED |
JP14 |
Power LED & keylock |
JP19 |
|
Reset switch |
JP17 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper/Switch |
Position | |
|
Factory configured - do not alter |
JP4 |
pins 2 & 3 closed | |
|
CPU speed select iOSC/2 |
JP5/6 |
Off | |
|
CPU speed select iOSC/1 |
JP5/6 |
On | |
|
Monitor type select monochrome |
JP5/8 |
Off | |
|
Monitor type select color |
JP5/8 |
On | |
|
Factory configured - do not alter |
JP20 |
pins 1 & 2 closed | |
|
Factory configured - do not alter |
JP21 |
pins 1 & 2 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) 1M x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 4M x 9 |
(4) 1M 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 | ||||||||||
|
Size |
JP3 |
JP6 |
JP7 |
JP8 |
JP9 |
JP10 |
JP11 |
JP13 |
JP15 |
JP16 |
|
64KB |
1 & 2 |
2 & 3 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
|
128KB |
1 & 2 |
1 & 2 |
Open |
1 & 2 |
1 & 2 |
1 & 2 |
2 & 3 |
open |
1 & 2 |
1 & 2 |
|
256KB |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
1024KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note:Pins designated should be in the closed position. | ||||||||||
|
CACHE SWITCH CONFIGURATION | ||||
|
Size |
JP5/3 |
JP5/4 |
JP5/5 |
JP5/7 |
|
64KB |
Off |
Off |
Off |
On |
|
128KB |
On |
On |
On |
Off |
|
256KB |
Off |
Off |
Off |
On |
|
1024KB |
Off |
Off |
Off |
On |
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP2 |
JP5/1 |
JP5/2 |
|
80486SX |
pins 2 & 3 closed |
Off |
Off |
|
80486DX |
pins 1 & 2 closed |
On |
On |