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# AST RESEARCH, INC.
PREMMIA MX 4/66D, PREMMIA MX 4/100T
Processor 80486SX/486
Overdrive/80486DX/80486DX2/80486DX4/P24T
Processor 25/33/50(internal)/66(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Video Chip ATI
Set
Maximum 128MB
Onboard
Memory
Maximum Video 4MB
Memory
Cache 64/256KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), riser slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| PS/2 mouse port | CN2 | External battery | J26 |
|-------------------+----------+------------------+----------|
| Serial port | CN3 | Speaker | J27 |
|-------------------+----------+------------------+----------|
| Serial port | CN4 | Chassis fan | J28 |
| | | power | |
|-------------------+----------+------------------+----------|
| Parallel port | CN5 | Front console | J29 pins |
| | | LED | 1 - 4 |
|-------------------+----------+------------------+----------|
| IDE interface 1 | J22 | Chassis fan | J32 |
| | | power | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | J23 | IDE interface | J40 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Floppy drive | J24 | Riser slot | SL1 |
| interface | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | Factory configured - do not alter | E6 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | CMOS memory normal operation | E8 | Open |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | E8 | Closed |
|---+-----------------------------------+-------+------------|
| » | Flash BIOS normal operation | SW1/1 | Off |
|---+-----------------------------------+-------+------------|
| | Flash BIOS force update at boot | SW1/1 | On |
|---+-----------------------------------+-------+------------|
| » | Password normal operation | SW1/2 | On |
|---+-----------------------------------+-------+------------|
| | Password clear | SW1/2 | Off |
|---+-----------------------------------+-------+------------|
| » | Monitor type select color | SW1/3 | On |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | SW1/3 | Off |
|---+-----------------------------------+-------+------------|
| » | Setup access enabled | SW1/4 | Off |
|---+-----------------------------------+-------+------------|
| | Setup access disabled | SW1/4 | On |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | SW1/5 | Off |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | SW1/6 | On |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | SW1/7 | On |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | SW1/8 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 32 | None | None | None |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 32 | None | None | None |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 32 | (1) 1M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 32 | None | None | None |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 2M x 32 | (1) 2M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 2M x 32 | (1) 2M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 2M x 32 | (1) 2M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 32 | (1) 2M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+----------+--------------+------------|
| 24MB | (1) 2M x 32 | (1) 2M x | (1) 2M x 32 | None |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 32MB | (1) 2M x 32 | (1) 2M x | (1) 2M x 32 | (1) 2M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 32MB | (1) 8M x 32 | None | None | None |
|-------+-------------+----------+--------------+------------|
| 32MB | (1) 4M x 32 | (1) 4M x | None | None |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 33MB | (1) 4M x 32 | (1) 4M x | (1) 256K x | NONE |
| | | 32 | 32 | |
|-------+-------------+----------+--------------+------------|
| 34MB | (1) 4M x 32 | (1) 4M x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|-------+-------------+----------+--------------+------------|
| 36MB | (1) 4M x 32 | (1) 4M x | (1) 1M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 40MB | (1) 4M x 32 | (1) 4M x | (1) 1M x 32 | (1) 1M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 40MB | (1) 4M x 32 | (1) 4M x | (1) 2M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 48MB | (1) 4M x 32 | (1) 4M x | (1) 2M x 32 | (1) 2M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 48MB | (1) 4M x 32 | (1) 4M x | (1) 4M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 64MB | (1) 4M x 32 | (1) 4M x | (1) 4M x 32 | (1) 4M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 64MB | (1) 8M x 32 | (1) 8M x | NONE | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 66MB | (1) 8M x 32 | (1) 8M x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|-------+-------------+----------+--------------+------------|
| 68MB | (1) 8M x 32 | (1) 8M x | (1) 1M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 72MB | (1) 8M x 32 | (1) 8M x | (1) 1M x 32 | (1) 1M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 72MB | (1) 8M x 32 | (1) 8M x | (1) 2M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 80MB | (1) 8M x 32 | (1) 8M x | (1) 2M x 32 | (1) 2M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 80MB | (1) 8M x 32 | (1) 8M x | (1) 4M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 96MB | (1) 8M x 32 | (1) 8M x | (1) 4M x 32 | (1) 4M x |
| | | 32 | | 32 |
|-------+-------------+----------+--------------+------------|
| 96MB | (1) 8M x 32 | (1) 8M x | (1) 8M x 32 | NONE |
| | | 32 | | |
|-------+-------------+----------+--------------+------------|
| 128MB | (1) 8M x 32 | (1) 8M x | (1) 8M x 32 | (1) 8M x |
| | | 32 | | 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 9 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | E5 |
|-----------------------------+------------------------------|
| 64KB | Open |
|-----------------------------+------------------------------|
| 256KB | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | E7 | E9 |
|-------------------+-----------------------+----------------|
| 25MHz | Pins 1 & 2 closed | Closed |
|-------------------+-----------------------+----------------|
| 33MHz | Pins 2 & 3 closed | Open |
|-------------------+-----------------------+----------------|
| 50iMHz | Pins 1 & 2 closed | Closed |
|-------------------+-----------------------+----------------|
| 66iMHz | Pins 2 & 3 closed | Open |
|-------------------+-----------------------+----------------|
| 100iMHz | Pins 1 & 2 closed | Closed |
|------------------------------------------------------------|
| Note: If 100iMHz is used, jumper E4 must be open. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Voltage | E4 |
|----------------------------+-------------------------------|
| 2x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 2.5x | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | E1 | E2 | E3 | E10 |
|-------------+--------+-------------+------------+----------|
| 80486SX | Open | Pins 2 & 3 | Pins 1 & 2 | Closed |
| (PQFP) | | closed | closed | |
|-------------+--------+-------------+------------+----------|
| 486 | Open | Pins 2 & 3 | Pins 1 & 2 | Closed |
| Overdrive | | closed | closed | |
|-------------+--------+-------------+------------+----------|
| 80486DX | Open | Pins 1 & 2 | Pins 1 & 2 | Closed |
| | | closed | closed | |
|-------------+--------+-------------+------------+----------|
| 80486DX2 | Open | Pins 1 & 2 | Pins 1 & 2 | Closed |
| | | closed | closed | |
|-------------+--------+-------------+------------+----------|
| 80486DX2 | Open | Pins 1 & 2 | Pins 2 & 3 | Open |
| (WB) | | closed | closed | |
|-------------+--------+-------------+------------+----------|
| 80486DX4 | Open | Pins 1 & 2 | Pins 1 & 2 | Closed |
| | | closed | closed | |
|-------------+--------+-------------+------------+----------|
| P24T | Open | Pins 2 & 3 | Pins 2 & 3 | Open |
| | | closed | closed | |
|------------------------------------------------------------|
| Note: E10 may not be present not on all boards. To |
| use write through cache on P24T, set E1 to the closed |
| position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | E11 | E12 | E13 | E14 | E15 | E16 |
|---------+--------+-------+-------+-------+--------+--------|
| 3v | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | Open | 1 & 2 |
| Cyrix | | | | | | |
|---------+--------+-------+-------+-------+--------+--------|
| 3v | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | Closed | 2 & 3 |
| Intel | | | | | | |
|---------+--------+-------+-------+-------+--------+--------|
| 5v | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
| Cyrix | | | | | | |
|---------+--------+-------+-------+-------+--------+--------|
| 5v | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Open |
| Intel | | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed |
| position. The location of E12 is unidentified. The |
| above jumpers may not be present on all boards. If |
| these jumpers are not present, only Intel CPUs may be |
| used. |
+------------------------------------------------------------+