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# AST RESEARCH, INC.
PREMIUM II 386SX/20 (MH Version 1)
MODELS 202373-001 & 202373-002
Processor 80386SX(on external CPU/Memory module)
Processor Speed 20MHz
Chip Set AST
Max. Onboard DRAM None (16MB on external CPU/Memory module)
Cache None (16KB on external CPU/Memory module)
BIOS AST
Dimensions 344mm x 250mm
I/O Options 16-bit external CPU/Memory module slot
16-bit external Memory module slot (2)
bus mouse port, floppy drive interface
IDE interface, parallel port, serial port
(2), SVGA port
NPU Options 80387SX(on external CPU/Memory module)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| SVGA port | CN1 | Front panel | P5 |
| | | switches & LEDs | |
|--------------------+----------+-----------------+----------|
| Bus mouse port | CN2 | Speaker | P6 |
|--------------------+----------+-----------------+----------|
| Serial port 1 | CN3 | External | P8 |
| | | battery | |
|--------------------+----------+-----------------+----------|
| Parallel port | CN4 | IDE interface | P11 |
|--------------------+----------+-----------------+----------|
| Serial port 2 | J15 | Fan power | P101 |
|--------------------+----------+-----------------+----------|
| VGA pass-through | J18 | 16-bit external | S1 |
| | | CPU/Memory | |
| | | module | |
|--------------------+----------+-----------------+----------|
| Floppy drive | P3 | 16-bit external | S2 |
| interface | | Memory module | |
| | | slot | |
|--------------------+----------+-----------------+----------|
| Third floppy drive | P4 | 16-bit external | S3 |
| interface | | Memory module | |
| | | slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|------------------------------------+------------+----------|
| » | VGA port enabled | SW1/switch | Closed |
| | | 1 | |
|---+--------------------------------+------------+----------|
| | VGA port disabled | SW1/switch | Open |
| | | 1 | |
|---+--------------------------------+------------+----------|
| » | Password check enabled | SW1/switch | Open |
| | | 2 | |
|---+--------------------------------+------------+----------|
| | Password check disabled | SW1/switch | Closed |
| | | 2 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW1/switch | Open |
| | alter | 3 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW1/switch | open |
| | alter | 4 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW1/switch | Closed |
| | alter | 5 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW1/switch | Closed |
| | alter | 6 | |
|---+--------------------------------+------------+----------|
| » | Monitor type select PS/2 style | SW1/switch | Closed |
| | | 7 | |
|---+--------------------------------+------------+----------|
| | Monitor type select AT style | SW1/switch | Open |
| | | 7 | |
|---+--------------------------------+------------+----------|
| » | Monitor type select VGA or | SW1/switch | Open |
| | fixed-frequency | 8 | |
|---+--------------------------------+------------+----------|
| | Monitor type select | SW1/switch | Closed |
| | multi-frequency | 8 | |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+----------+------------|
| » | Parity check enabled | E1 | Closed |
|-------+----------------------------+----------+------------|
| | Parity check disabled | E1 | Open |
|------------------------------------------------------------|
| Note: AST CPU/Memory module part number is 202337-001 or |
| 202337-002. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+-------------+------------+------------+-----------|
| 1MB | (1) 1M x 9 | NONE | NONE | NONE |
|--------+-------------+------------+------------+-----------|
| 2MB | (1) 1M x 9 | (1) 1M x 9 | NONE | NONE |
|--------+-------------+------------+------------+-----------|
| 3MB | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x 9 | NONE |
|--------+-------------+------------+------------+-----------|
| 4MB | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x |
| | | | | 9 |
|--------+-------------+------------+------------+-----------|
| 4MB | (1) 4M x 9 | NONE | NONE | NONE |
|--------+-------------+------------+------------+-----------|
| 5MB | (1) 1M x 9 | (1) 4M x 9 | NONE | NONE |
|--------+-------------+------------+------------+-----------|
| 6MB | (1) 1M x 9 | (1) 1M x 9 | (1) 4M x 9 | NONE |
|--------+-------------+------------+------------+-----------|
| 7MB | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x 9 | (1) 4M x |
| | | | | 9 |
|--------+-------------+------------+------------+-----------|
| 8MB | (1) 4M x 9 | (1) 4M x 9 | NONE | NONE |
|--------+-------------+------------+------------+-----------|
| 9MB | (1) 1M x 9 | (1) 4M x 9 | (1) 4M x 9 | NONE |
|--------+-------------+------------+------------+-----------|
| 10MB | (1) 1M x 9 | (1) 1M x 9 | (1) 4M x 9 | (1) 4M x |
| | | | | 9 |
|--------+-------------+------------+------------+-----------|
| 12MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x 9 | NONE |
|--------+-------------+------------+------------+-----------|
| 13MB | (1) 1M x 9 | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x |
| | | | | 9 |
|--------+-------------+------------+------------+-----------|
| 16MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x |
| | | | | 9 |
|------------------------------------------------------------|
| Notes: 16KB of SRAM Cache is on the CPU/Memory module. |
| |
| 128KB of DRAM is reserved for System and VGA BIOS |
| shadowing and cannot be disabled. |
| |
| Up to two of the following memory boards may be installed |
| in addition to the CPU/Memory module: AST part numbers |
| 202275-004, 202275-006, 202387-001, or 202387-005. |
+------------------------------------------------------------+