SILICON STAR INTERNATIONAL, INC.
AT420/AT425/AT433/AT450
Processor | 80486SX/80486DX |
Processor Speed | 20/25/33/50MHz |
Chip Set | SIS |
Max. Onboard DRAM | 32MB |
Cache | 32/64/128/256/512/1024KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Speaker | CN1 | Turbo switch | JP1 |
Power LED & keylock | CN2 | Turbo LED | JP2 |
External battery | CN3 | Reset switch | SW1 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | CMOS memory normal operation | JP5 | pins 1 & 2 closed |
CMOS memory clear | JP5 | pins 2 & 3 closed | |
» | Monitor type select monochrome | JP7 | Open |
Monitor type select color | JP7 | Closed | |
» | Factory configured - do not alter | JP8 | Open |
Note:Jumper JPX3 is closed using an 8-pin terminating resistor. |
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 | Location |
32KB | (4) 8K x 8 | NONE | (1) 8K x 8 | T-1 |
32KB | (4) 8K x 8 | (4) 8K x 8 | (2) 16K x 4 | T-2 |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | T-1 |
64KB | (4) 8K x 8 | (4) 8K x 8 | (2) 16K x 4 | T-2 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | T-1 |
128KB | (4) 32K x 8 | NONE | (2) 16K x 4 | T-2 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 16K x 4 | T-2 |
512KB | (4) 128K x 8 | NONE | (1) 32K x 8 | T-1 |
512KB | (4) 128K x 8 | NONE | (2) 64K x 4 | T-2 |
1024KB | (4) 128K x 8 | (4) 128K x 8 | (1) 128K x 8 | T-1 |
1024KB | (4) 128K x 8 | (4) 128K x 8 | (2) 64K x 4 | T-2 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP3 | JP4 | JPX4 | JPX5 |
32KB | Open | Open | pins 1 - 8 closed | pins 1 - 8 closed |
64KB | Open | Open | pins 9 - 16 closed | pins 3 - 10 closed |
128KB | Open | Closed | pins 1 - 8 closed | pins 5 - 12 closed |
256KB | Open | Closed | pins 9 - 16 closed | pins 7 - 14 closed |
512KB | Open | Closed | pins 1 - 8 closed | pins 9 - 16 closed |
1024KB | Closed | Closed | pins 9 - 16 closed | pins 9 - 16 closed |
Note:Jumpers JPX4 & JPX5 are closed using 8-pin terminating resistors. |
CACHE JUMPER CONFIGURATION | ||
Type | JP6 | JPX3 |
80486SX | Closed | Open |
80486DX | Open | Closed |