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# AST RESEARCH, INC.
Power Premium 386SX/25
(Model 202441-001)
Processor 80386SX (on external CPU/Memory module)
Processor Speed 25MHz
Chip Set AST
Max. Onboard None (16MB on external CPU/Memory module)
DRAM
SRAM 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 | Third floppy | J25 |
| | | drive interface | |
|-------------------+----------+------------------+----------|
| Bus mouse port | CN2 | External battery | J26 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN3 | Speaker | J27 |
| (COM1) | | | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN4 | Fan power | J28 |
| (COM2) | | | |
|-------------------+----------+------------------+----------|
| Parallel port | J13 | Front panel | J29 |
| | | switches & LEDs | |
|-------------------+----------+------------------+----------|
| VGA pass-through | J19 | IDE interface | J40 |
| | | LED | |
|-------------------+----------+------------------+----------|
| IDE interface | J22 | 16-bit external | S1 |
| | | CPU/Memory | |
| | | module | |
|-------------------+----------+------------------+----------|
| Floppy drive | J24 | 16-bit external | S2 & S3 |
| interface | | Memory module | |
| | | slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | CMOS memory normal | SW1/switch 1 | open |
| | operation | | |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | SW1/switch 1 | closed |
|---+---------------------------+---------------+------------|
| » | Password check enabled | SW1/switch 2 | open |
|---+---------------------------+---------------+------------|
| | Password check disabled | SW1/switch 2 | closed |
|---+---------------------------+---------------+------------|
| » | Flash BIOS write disabled | SW1/switch 3 | open |
|---+---------------------------+---------------+------------|
| | Flash BIOS write enabled | SW1/switch 3 | closed |
|---+---------------------------+---------------+------------|
| » | VGA port enabled | SW1/switch 4 | closed |
|---+---------------------------+---------------+------------|
| | VGA port disabled | SW1/switch 4 | open |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E1 | closed |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E2 | pins 1 & 2 |
| | not alter | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E3 | closed |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E4 | open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | E5 | open |
| | not alter | | |
+------------------------------------------------------------+
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 202438-004. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | NONE |
| | | | 9 | |
|---------+-------------+------------+-----------+-----------|
| 4MB | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x | (1) 1M x |
| | | | 9 | 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 | NONE |
| | | | 9 | |
|---------+-------------+------------+-----------+-----------|
| 7MB | (1) 1M x 9 | (1) 1M x 9 | (1) 1M x | (1) 4M x |
| | | | 9 | 9 |
|---------+-------------+------------+-----------+-----------|
| 8MB | (1) 4M x 9 | (1) 4M x 9 | NONE | NONE |
|---------+-------------+------------+-----------+-----------|
| 9MB | (1) 1M x 9 | (1) 4M x 9 | (1) 4M x | NONE |
| | | | 9 | |
|---------+-------------+------------+-----------+-----------|
| 10MB | (1) 1M x 9 | (1) 1M x 9 | (1) 4M x | (1) 4M x |
| | | | 9 | 9 |
|---------+-------------+------------+-----------+-----------|
| 12MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x | NONE |
| | | | 9 | |
|---------+-------------+------------+-----------+-----------|
| 13MB | (1) 1M x 9 | (1) 4M x 9 | (1) 4M x | (1) 4M x |
| | | | 9 | 9 |
|---------+-------------+------------+-----------+-----------|
| 16MB | (1) 4M x 9 | (1) 4M x 9 | (1) 4M x | (1) 4M x |
| | | | 9 | 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 202275-001, 202275-004, |
| 202275-006, 202387-001 |
| |
| or 202387-005. |
+------------------------------------------------------------+