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# AST RESEARCH, INC.
PREMIUM 386C
Processor 80386DX
Processor Speed 20MHz
Chip Set AST
Max. Onboard None (16MB on 32-bit external memory card)
DRAM
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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| 32-bit external | J7 | Front panel | P5 |
| memory card | | switches & LEDs | |
|-------------------+----------+------------------+----------|
| SMART expansion | S1, S2 & | Speaker | P6 |
| or 16-bit ISA | S3 | | |
|-------------------+----------+------------------+----------|
| Serial port 2 | P2 | External battery | P8 |
| header | | | |
|-------------------+----------+------------------+----------|
| Floppy drive | P3 | Optional ROM | U89 |
| interface (A: and | | (odd) | |
| B:) | | | |
|-------------------+----------+------------------+----------|
| Third floppy | P4 | Optional ROM | U88 |
| drive interface | | (even) | |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+
IMG IMG 3
+------------------------------------------------------------+
| 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 | NONE | NONE |
| | | x 9 | | |
|---------+-----------------+----------+----------+----------|
| 3MB 1 | (4) 256K x 9 | (4) 256K | (4) 256K | NONE |
| | | x 9 | x 9 | |
|---------+-----------------+----------+----------+----------|
| 4MB 1 | (4) 256K x 9 | (4) 256K | (4) 256K | (4) 256K |
| | | x 9 | x 9 | x 9 |
|---------+-----------------+----------+----------+----------|
| 4MB 2 | (4) 1M x 9 | NONE | NONE | NONE |
|---------+-----------------+----------+----------+----------|
| 5MB 1 | (4) 256K x 9 | (4) 1M x | NONE | NONE |
| | | 9 | | |
|---------+-----------------+----------+----------+----------|
| 6MB 1 | (4) 256K x 9 | (4) 256K | (4) 1M x | NONE |
| | | x 9 | 9 | |
|---------+-----------------+----------+----------+----------|
| 7MB 1 | (4) 256K x 9 | (4) 256K | (4) 256K | (4) 1M x |
| | | x 9 | x 9 | 9 |
|---------+-----------------+----------+----------+----------|
| 8MB 2 | (4) 1M x 9 | (4) 1M x | NONE | NONE |
| | | 9 | | |
|---------+-----------------+----------+----------+----------|
| 9MB 1 | (4) 256K x 9 | (4) 1M x | (4) 1M x | NONE |
| | | 9 | 9 | |
|---------+-----------------+----------+----------+----------|
| 10MB 1 | (4) 256K x 9 | (4) 256K | (4) 1M x | (4) 1M x |
| | | x 9 | 9 | 9 |
|---------+-----------------+----------+----------+----------|
| 12MB 2 | (4) 1M x 9 | (4) 1M x | (4) 1M x | NONE |
| | | 9 | 9 | |
|---------+-----------------+----------+----------+----------|
| 13MB 1 | (4) 256K x 9 | (4) 1M x | (4) 1M x | (4) 1M x |
| | | 9 | 9 | 9 |
|---------+-----------------+----------+----------+----------|
| 16MB 2 | (4) 1M x 9 | (4) 1M x | (4) 1M x | (4) 1M x |
| | | 9 | 9 | 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 | open | open | open | open | open | open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|2MB | open |closed| open | open | open | open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|3MB | open |closed| open |closed| open | open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|4MB | open |closed| open |closed| open |closed|closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|4MB | open | open | open |closed| open |closed|closed|closed|
| 2 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|5MB |closed| open | open | open | open | open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|6MB | open |closed|closed| open | open | open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|7MB | open |closed| open |closed|closed| open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|8MB |closed| open | open | open | open | open |closed|closed|
| 2 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|9MB |closed| open |closed| open | open | open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|10MB| open |closed|closed| open |closed| open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|12MB|closed| open |closed| open | open | open |closed|closed|
| 2 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|13MB|closed| open |closed| open |closed| open |closed| open |
| 1 | | | | | | | | |
|----+------+------+------+------+------+------+------+------|
|16MB|closed| open |closed| open |closed| open |closed|closed|
| 2 | | | | | | | | |
|------------------------------------------------------------|
|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) |
+------------------------------------------------------------+