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# AST RESEARCH, INC.
PREMIUM II 486SX/20 & 486SX/25
MODELS 202373-001 & 202373-002
Processor 80486SX/80487SX (on external CPU/Memory
module)
Processor Speed 20/25MHz
Chip Set AST
Max. Onboard DRAM None (16MB on external CPU/Memory module)
Cache None
BIOS AST
Dimensions 344mm x 250mm
I/O Options 32-bit external CPU/Memory module slot
32-bit external Memory module slot (2)
bus mouse port, floppy drive interface
IDE interface, parallel port, serial port
(2), SVGA port
NPU Options 4167 (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 |
| (COM1) | | battery | |
|--------------------+----------+-----------------+----------|
| Parallel port | CN4 | IDE interface | P11 |
|--------------------+----------+-----------------+----------|
| Serial port 2 | J15 | Fan power | P101 |
| (COM2) | | | |
|--------------------+----------+-----------------+----------|
| VGA pass-through | J18 | 32-bit external | S1 |
| | | CPU/Memory | |
| | | module | |
|--------------------+----------+-----------------+----------|
| Floppy drive | P3 | 32-bit external | S2 |
| interface | | Memory module | |
| | | slot | |
|--------------------+----------+-----------------+----------|
| Third floppy drive | P4 | 32-bit external | S3 |
| interface | | Memory module | |
| | | slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
| | SW1 | |
|-------------------------------------+-----------+----------|
| » | VGA port enabled | switch 1 | closed |
|---+---------------------------------+-----------+----------|
| | VGA port disabled | switch 1 | open |
|---+---------------------------------+-----------+----------|
| » | Password check enabled | switch 2 | open |
|---+---------------------------------+-----------+----------|
| | Password check disabled | switch 2 | closed |
|---+---------------------------------+-----------+----------|
| » | Factory configured - do not | switch 3 | open |
| | alter | | |
|---+---------------------------------+-----------+----------|
| » | Factory configured - do not | switch 4 | open |
| | alter | | |
|---+---------------------------------+-----------+----------|
| » | Factory configured - do not | switch 5 | closed |
| | alter | | |
|---+---------------------------------+-----------+----------|
| » | Factory configured - do not | switch 6 | closed |
| | alter | | |
|---+---------------------------------+-----------+----------|
| » | Monitor type select PS/2 style | switch 7 | closed |
|---+---------------------------------+-----------+----------|
| | Monitor type select AT style | switch 7 | open |
|---+---------------------------------+-----------+----------|
| » | Monitor type select VGA or | switch 8 | open |
| | fixed-frequency | | |
|---+---------------------------------+-----------+----------|
| | Monitor type select | switch 8 | closed |
| | multi-frequency | | |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
| » | Parity check enabled | E1 | closed |
|---+------------------------------------+--------+----------|
| | Parity check disabled | E1 | open |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | E2 | closed |
|------------------------------------------------------------|
| Note:AST CPU/Memory module part number is 202436-001. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+----------------------+---------------------|
| 2MB | (2) 1M x 9 | NONE |
|---------------+----------------------+---------------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 |
|---------------+----------------------+---------------------|
| 8MB | (2) 4M x 9 | NONE |
|---------------+----------------------+---------------------|
| 10MB | (2) 1M x 9 | (2) 4M x 9 |
|---------------+----------------------+---------------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 |
|------------------------------------------------------------|
| Notes: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. |
+------------------------------------------------------------+