PREMIUM/486-25 Motherboard Settings and Configuration
AST RESEARCH, INC.
PREMIUM/486-25
Processor | 80486DX |
Processor Speed | 25MHz |
Chip Set | AST |
Max. Onboard DRAM | None (36MB total on 32-bit external cards) |
Cache | None |
BIOS | AST |
Dimensions | 355mm x 251mm |
I/O Options | Parallel port, serial ports (2), floppy drive interface, IDE interface, 32-bit external CPU/NPU card slot, 32-bit external memory card slots (2), 16-bit external expansion card slot |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
32-bit external CPU/NPU card | CN1 | Auxiliary floppy drive interface | P4 |
32-bit external memory card | CN2 | Power LED & reset switch | P5 |
32-bit external memory card | CN3 | Speaker | P6 |
16-bit external expansion card | CN4 | External battery | P8 |
Primary floppy drive interface | P3 | IDE interface | P11 |
Note:Expansion card slots CN1 through CN4 will accept standard 8 or 16-bit ISA cards. | |||
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
| » | Password check enabled | E1 | pins 1 & 2 closed |
Password check disabled | E1 | pins 2 & 3 closed | |
| » | Factory configured - do not alter | E2 | Open |
| » | Factory configured - do not alter | E3 | Open |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
| » | Parity check enabled | E1 | Closed |
Parity check disabled | E1 | Open | |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
2MB | (2) 256K x 36 | NONE |
4MB | (2) 256K x 36 | (2) 256K x 36 |
USER CONFIGURABLE SETTINGS | |||
Function | SW1 | Position | |
| » | Parity check enabled | SW1/1 | On |
Parity check disabled | SW1/1 | Off | |
| » | Total system memory is less than 16MB | SW1/2 | Off |
Total system memory is 16MB or more | SW1/2 | On | |
| » | Factory configured - do not alter | SW1/3 | Off |
DRAM SWITCH CONFIGURATION | ||||||
Total memory | SW1/4 | SW1/5 | SW1/6 | SW1/7 | SW1/8 | |
1MB | On | On | On | On | Off | |
2MB | On | On | On | Off | On | |
3MB | On | On | On | Off | Off | |
| » | 4MB | On | On | Off | On | On |
5MB | On | On | Off | On | Off | |
6MB | On | On | Off | Off | On | |
7MB | On | On | Off | Off | Off | |
8MB | On | Off | On | On | On | |
9MB | On | Off | On | On | Off | |
10MB | On | Off | On | Off | On | |
11MB | On | Off | On | Off | Off | |
12MB | On | Off | Off | On | On | |
13MB | On | Off | Off | On | Off | |
14MB | On | Off | Off | Off | On | |
15MB | On | Off | Off | Off | Off | |
16MB | Off | On | On | On | On | |
17MB | Off | On | On | On | Off | |
18MB | Off | On | On | Off | On | |
19MB | Off | On | On | Off | Off | |
20MB | Off | On | Off | On | On | |
Note:Set the switches to the total amount of system memory installed not including this card.
A setting of more than 4MB means that this card is the second memory card that is installed. | ||||||
DRAM CONFIGURATION | ||||||||||||||||
Size | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
0MB | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None |
1MB | Filled | None | None | None | None | None | None | None | None | None | None | None | None | None | None | None |
2MB | Filled | Filled | None | None | None | None | None | None | None | None | None | None | None | None | None | None |
3MB | Filled | Filled | Filled | None | None | None | None | None | None | None | None | None | None | None | None | None |
4MB | Filled | Filled | Filled | Filled | None | None | None | None | None | None | None | None | None | None | None | None |
5MB | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None | None | None | None | None | None | None |
6MB | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None | None | None | None | None | None |
7MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None | None | None | None | None |
Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None | None | None | None |
9MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None | None | None |
10MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None | None |
11MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None | None |
12MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None | None |
13MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None | None |
14MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None | None |
15MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | None |
16MB | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled | Filled |
Note:Banks (0 through 15) are filled using (1) 256K x 36 SIMMs. This table is for a single card only. | ||||||||||||||||
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