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# AST RESEARCH, INC.
PREMMIA SYSTEM BOARD (P/N202514-00X)
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set ATI
Max. Onboard 128MB
DRAM
Cache 64/256KB (Located on the external cache module)
BIOS AST
Dimensions 355mm x 304mm
I/O Options Cache/Pentium upgrade module, floppy drive
interface (2), IDE interface,
parallel port, PS/2 mouse port, serial ports (2),
VGA feature connector,
video port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
|Purpose |Location |Purpose |Location|
|--------------------+---------+--------------------+--------|
|Bus mouse port | J12 |Manufacturer’s test | J23 |
| | |header | |
|--------------------+---------+--------------------+--------|
|Parallel port | J13 |Floppy drive | J24 |
| | |interface 1 & 2 | |
|--------------------+---------+--------------------+--------|
|Serial port 1 | J14 |Floppy drive | J25 |
| | |interface 3 | |
|--------------------+---------+--------------------+--------|
|Personality/feature | J15 |External battery | J26 |
|connector | | | |
|--------------------+---------+--------------------+--------|
|Personality/feature | J16 |Speaker | J27 |
|connector | | | |
|--------------------+---------+--------------------+--------|
|Pentium/Cache module| J17 |Chassis fan power | J28 |
|upgrade | | | |
|--------------------+---------+--------------------+--------|
|SVGA monitor port | J18 |Front console header| J29 |
|--------------------+---------+--------------------+--------|
|VGA port | J19 |Manufacturer’s test | J30 |
| | |header | |
|--------------------+---------+--------------------+--------|
|Serial port 2 | J20 |IDE interface LED | J35 |
|--------------------+---------+--------------------+--------|
|IDE interface | J22 |Personality/feature | J46 |
| | |connector | |
|------------------------------------------------------------|
|Note:The personality/feature connectors alow various network|
|modules to be added to the system. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Factory configured - do | E2 | Open |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Pariity checking enabled | E3 | Closed |
|---+---------------------------+---------------+------------|
| | Pariity checking disabled | E3 | Open |
|---+---------------------------+---------------+------------|
| » | Flash BIOS voltage 12V | E5 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Flash BIOS voltage 5V | E5 | pins 1 & 2 |
| | | | open |
|---+---------------------------+---------------+------------|
| » | VGA enabled | SW1/switch 1 | On |
|---+---------------------------+---------------+------------|
| | VGA disabled | SW1/switch 1 | Off |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 2 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | CMOS memory normal | SW1/switch 3 | Off |
| | operation | | |
|---+---------------------------+---------------+------------|
| | CMOS memory clear | SW1/switch 3 | On |
|---+---------------------------+---------------+------------|
| » | BIOS normal operation | SW1/switch 4 | Off |
|---+---------------------------+---------------+------------|
| | BIOS forced update | SW1/switch 4 | On |
|---+---------------------------+---------------+------------|
| » | Password override | SW1/switch 5 | Off |
|---+---------------------------+---------------+------------|
| | Password inhibited | SW1/switch 5 | On |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 6 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 7 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 8 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW1/switch 9 | Off |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Monitor type select color | SW1/switch 10 | On |
|---+---------------------------+---------------+------------|
| | Monitor type select | SW1/switch 10 | Off |
| | monochrome | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 2MB | (1) 1M x 36 | (1) 1M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 4MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 4MB | (1) 2M x 36 | (1) 2M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 6MB | (1) 1M x 36 | (1) 1M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 8MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 8MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 12MB | (1) 2M x 36 | (1) 2M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 18MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 20MB | (1) 2M x 36 | (1) 2M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 16M x | (1) 16M x | NONE | NONE |
| | 36 | 9 | | |
|-------+-------------+------------+------------+------------|
| 34MB | (1) 1M x 36 | (1) 1M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 2M x 36 | (1) 2M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 8M x 36 | (1) 8M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 32M x | (1) 32M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 66MB | (1) 1M x 36 | (1) 1M x | (1) 32M x | (1) 32M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 2M x 36 | (1) 2M x | (1) 32M x | (1) 32M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 4M x 36 | (1) 4M x | (1) 32M x | (1) 32M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 8M x 36 | (1) 8M x | (1) 32M x | (1) 32M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 16M x | (1) 16M x | (1) 32M x | (1) 32M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 32M x | (1) 32M x | (1) 32M x | (1) 32M x |
| | 36 | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| PQFP | PGA |Pentium | E1 | E4 | E6 | E7 |
|--------+----------------+--------+------+------+-----+-----|
|80486SX | None | None |pins 2|pins 1|pins |pins |
| | | | & 3 | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
|80486SX | 80487SX | None |pins 2|pins 1|pins |pins |
| | | | & 3 | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
|80486SX | ODP486SX | None |pins 2|pins 1|pins |pins |
| | | | & 3 | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
|80486SX |80486DX/80486DX2| None |pins 1|pins 2|pins |pins |
| | | | & 2 | & 3 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
|80486DX | None | None |pins 2|pins 1|pins |pins |
| | | | & 3 | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
|80486DX |80486DX/80486DX2| None |pins 1|pins 2|pins |pins |
| | | | & 2 | & 3 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
|80486DX | ODP486SX | None |pins 2|pins 1|pins |pins |
| | | | & 3 | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
| None | 80486SX | None | Open | Open |pins |pins |
| | | | | |2 & 3|2 & 3|
|--------+----------------+--------+------+------+-----+-----|
| None |80486DX/80486DX2| None | Open |pins 2|pins |pins |
| | | | | & 3 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
| None | ODP486SX | None | Open |pins 1|pins |pins |
| | | | | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
| Any | None | Yes |pins 2|pins 1|pins |pins |
| | | | & 3 | & 2 |1 & 2|1 & 2|
|--------+----------------+--------+------+------+-----+-----|
| None | None | Yes | Open |pins 1|pins |pins |
| | | | | & 2 |1 & 2|1 & 2|
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
| |
|Before installing the Pentium upgrade board, remove the |
|processor in the ZIF socket at U13. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (2) 46256 | (2) 46256 |
|------------------+--------------------+--------------------|
| 2MB | (2) 46256 | (2) 46256 |
+------------------------------------------------------------+