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# AST RESEARCH, INC.
POWER PREMIUM 486SX/25 (MODEL 202441-001)
Processor 80486SX/80487SX (on external CPU/Memory
module)
Processor Speed 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 | 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 | 32-bit external | S1 |
| | | CPU/Memory | |
| | | module | |
|-------------------+----------+------------------+----------|
| Floppy drive | J24 | 32-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 |
|---+------------------------------------+--------+----------|
| » | Factory configured - do not alter | E2 | closed |
|------------------------------------------------------------|
| Note:AST CPU/Memory module part number is 202439-002. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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. |
+------------------------------------------------------------+