PREMIUM/386 Motherboard Settings and Configuration
AST RESEARCH, INC.
PREMIUM/386
Processor | 80386DX |
Processor Speed | 20MHz |
Chip Set | AST |
Max. Onboard DRAM | None |
Cache | None |
BIOS | AST |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit external memory card slot Parallel port Serial port (2) SMART expansion/16-bit ISA expansion slots (3) |
NPU Options | 80287/80387 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
32-bit external memory card | J7 | Front panel switches & LEDs | P5 |
SMART expansion or 16-bit ISA | S1, S2 & S3 | Speaker | P6 |
Serial port 2 header | P2 | External battery | P8 |
Floppy drive interface (A: and B:) | P3 | Optional ROM (even) | U88 |
Third floppy drive interface | P4 | Optional ROM (odd) | U89 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Serial port 1 | COM1 | Parallel port | LPT1 |
Serial port 2 | COM2 | Keyboard | KYBD |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
| » | Factory configured - do not alter | E1 | closed |
| » | Factory configured - do not alter | E2 | closed |
| » | Factory configured - do not alter | E3 | closed |
| » | Factory configured - do not alter | E4 | open |
| » | Factory configured - do not alter | E5 | closed |
| » | Factory configured - do not alter | E6 | open |
Note:Jumper E6 may not appear on all board revisions. | |||
USER CONFIGURABLE SETTINGS | |||
Function | Switch SW1 | Position | |
| » | Parity check enabled | switch 7 | closed |
Parity check disabled | switch 7 | open | |
| » | Factory configured - do not alter | switch 8 | open |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (4) 256K x 9 | NONE | NONE | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 | NONE | NONE |
3MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | NONE |
4MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 |
5MB | (4) 256K x 9 | (4) 1M x 9 | NONE | NONE |
6MB | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 | NONE |
7MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 |
9MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
10MB | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 |
13MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
Note:Bank 0 must be populated with 256KB SIMMs. | ||||
DRAM SWITCH CONFIGURATION | ||||||
Size | SW1/switch 1 | SW1/switch 2 | SW1/switch 3 | SW1/switch 4 | SW1/switch 5 | SW1/switch 6 |
1MB | open | open | open | open | open | open |
2MB | open | closed | open | open | open | open |
3MB | open | closed | open | closed | open | open |
4MB | open | closed | open | closed | open | closed |
5MB | closed | open | open | open | open | open |
6MB | open | closed | closed | open | open | open |
7MB | open | closed | open | closed | closed | open |
9MB | closed | open | closed | open | open | open |
10MB | open | closed | closed | open | closed | open |
13MB | closed | open | closed | open | open | open |
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