PREMIUM 386C Motherboard Settings and Configuration
AST RESEARCH, INC.
PREMIUM 386C
Processor | 80386DX |
Processor Speed | 20MHz |
Chip Set | AST |
Max. Onboard DRAM | None (16MB on 32-bit external memory card) |
Cache | None (64KB on 32-bit external memory card) |
BIOS | AST |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit external memory card slot, parallel port, serial ports (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 (odd) | U89 |
Third floppy drive interface | P4 | Optional ROM (even) | U88 |
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 | Position | |
| » | Parity check enabled | SW1/switch 7 | closed |
Parity check disabled | SW1/switch 7 | open | |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB 1 | (4) 256K x 9 | NONE | NONE | NONE |
2MB 1 | (4) 256K x 9 | (4) 256K x 9 | NONE | NONE |
3MB 1 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | NONE |
4MB 1 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 |
4MB 2 | (4) 1M x 9 | NONE | NONE | NONE |
5MB 1 | (4) 256K x 9 | (4) 1M x 9 | NONE | NONE |
6MB 1 | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 | NONE |
7MB 1 | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 |
8MB 2 | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
9MB 1 | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
10MB 1 | (4) 256K x 9 | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 |
12MB 2 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
13MB 1 | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
16MB 2 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
Notes 1 & 2 :Please see the next table for the proper switch settings for this configuration. | ||||
DRAM SWITCH CONFIGURATION | ||||||||
Size | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 | SW1/7 | SW1/8 |
1MB 1 | open | open | open | open | open | open | closed | open |
2MB 1 | open | closed | open | open | open | open | closed | open |
3MB 1 | open | closed | open | closed | open | open | closed | open |
4MB 1 | open | closed | open | closed | open | closed | closed | open |
4MB 2 | open | open | open | closed | open | closed | closed | closed |
5MB 1 | closed | open | open | open | open | open | closed | open |
6MB 1 | open | closed | closed | open | open | open | closed | open |
7MB 1 | open | closed | open | closed | closed | open | closed | open |
8MB 2 | closed | open | open | open | open | open | closed | closed |
9MB 1 | closed | open | closed | open | open | open | closed | open |
10MB 1 | open | closed | closed | open | closed | open | closed | open |
12MB 2 | closed | open | closed | open | open | open | closed | closed |
13MB 1 | closed | open | closed | open | closed | open | closed | open |
16MB 2 | closed | open | closed | open | closed | open | closed | closed |
Notes 1 & 2 :Please see the previous table for the proper configuration for these switch settings. | ||||||||
SRAM CONFIGURATION | |
Size | Cache SRAM |
64KB | (8) 8K x 8 on a SIMM-type module (AST Part# 202303-001) |
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