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# AAEON TECHNOLOGY, INC.
SBC-490
Device Mainboard
Type
Processor 80486SX/SL80486SX/80486DX/SL80486DX/CX486DX2/SGS486DX2/ TI486DX2/
IBM486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/(SL)AM486DX4/
SL80486DX4/ P24D/CXMISC/CX 5X86/IBM 5X86/SGS 5X86/AM X5
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set ALI 1489
Video Chip Trident
Set
Maximum 128MB (EDO supported)
Onboard
Memory
Maximum 2MB
Video
Memory
Cache 128/256/512KB
BIOS Award
Dimensions 338mm x 122mm
I/O Floppy drive interface, green PC connector, IDE interfaces (2),
Options parallel port, PS/2 mouse port, serial ports (2), VGA feature
connector, VGA port, IR connector, PC/104connectors (2)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| Power LED & | C1 | Auxiliary keyboard | CN5 |
| keylock | | connector | |
|-----------------+----------+--------------------+----------|
| Speaker | C2 | PC/104 connector | CN6 |
|-----------------+----------+--------------------+----------|
| Reset switch | C3 | PC/104 connector | CN7 |
|-----------------+----------+--------------------+----------|
| Green PC | C4 | IDE interface 2 | CN8 |
| connector | | | |
|-----------------+----------+--------------------+----------|
| Green PC | C5 | IDE interface 1 | CN9 |
| connector | | | |
|-----------------+----------+--------------------+----------|
| Turbo LED | C6 | Floppy drive | CN10 |
| | | interface | |
|-----------------+----------+--------------------+----------|
| Turbo switch | C7 | Parallel port | CN11 |
|-----------------+----------+--------------------+----------|
| CPU fan power | C8 | VGA feature | CN12 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Power connector | CN1 | Serial port 2 | CN13 |
|-----------------+----------+--------------------+----------|
| Serial port 1 | CN2 | IDE interface LED | JP2 |
|-----------------+----------+--------------------+----------|
| VGA port | CN3 | IDE interface LED | JP3 |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | CN4 | IR connector | JP17 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+--------+-----------|
| | Flash BIOS write protect enabled | JP11 | Closed |
|---+-----------------------------------+--------+-----------|
| | Flash BIOS write protect disabled | JP11 | Open |
|---+-----------------------------------+--------+-----------|
| ยป | CMOS memory normal operation | JP15 | Open |
|---+-----------------------------------+--------+-----------|
| | CMOS memory clear | JP15 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | None | None | None |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | None | None |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | None |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 1M x 36 | (1) 256K x | None | None |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | None |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 7MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 2M x 36 | (1) 256K x | None | None |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 2M x 36 | (1) 256K x | (1) 256K x | None |
| | | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 11MB | (1) 2M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+--------------+------------+----------|
| 17MB | (1) 4M x 36 | (1) 256K x | None | None |
| | | 36 | | |
|-------+-------------+--------------+------------+----------|
| 18MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | None |
| | | 36 | 36 | |
|-------+-------------+--------------+------------+----------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 | None | None |
|-------+-------------+--------------+------------+----------|
| 20MB | (1) 2M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|-------+-------------+--------------+------------+----------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 32MB | (1) 8M x 36 | None | None | None |
|-------+-------------+--------------+------------+----------|
| 32MB | (1) 4M x 36 | (1) 2M x 36 | (1) 2M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | None | None |
|-------+-------------+--------------+------------+----------|
| 34MB | (1) 8M x 36 | (1) 512K x | None | None |
| | | 36 | | |
|-------+-------------+--------------+------------+----------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 36MB | (1) 1M x 36 | (1) 8M x 36 | None | None |
|-------+-------------+--------------+------------+----------|
| 40MB | (1) 8M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 40MB | (1) 8M x 36 | (1) 2M x 36 | None | None |
|-------+-------------+--------------+------------+----------|
| 40MB | (1) 4M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|-------+-------------+--------------+------------+----------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 | None | None |
|-------+-------------+--------------+------------+----------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 56MB | (1) 8M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|-------+-------------+--------------+------------+----------|
| 64MB | (1) 8M x 36 | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | None | None |
|-------+-------------+--------------+------------+----------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|-------+-------------+--------------+------------+----------|
| 80MB | (1) 8M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|-------+-------------+--------------+------------+----------|
| 96MB | (1) 8M x 36 | (1) 8M x 36 | (1) 8M x | None |
| | | | 36 | |
|-------+-------------+--------------+------------+----------|
| 128MB | (1) 8M x 36 | (1) 8M x 36 | (1) 8M x | (1) 8M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (4) 64K x 8 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (4) 128K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP12 |
|----------------------------+-------------------------------|
| 128KB | Open |
|----------------------------+-------------------------------|
| 256KB | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 512KB | Pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (2) 256K x 16 | None |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 16 | (2) 256K x 16 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP13 | JP14 |
|------------+--------------------------+--------------------|
| 25MHz | Open | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 33MHz | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 40MHz | Pins 3 & 4, 5 & 6 closed | Pins 2 & 3 closed |
|------------+--------------------------+--------------------|
| 50iMHz | Open | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 50MHz | Pins 1 & 2, 5 & 6 closed | Pins 2 & 3 closed |
|------------+--------------------------+--------------------|
| 66iMHz | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 75iMHz | Open | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 100iMHz | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP8 |
|--------------+---------------------------------------------|
| 80486SX | 1 & 2, 19 & 20, 23 & 24, 25 & 26 |
|--------------+---------------------------------------------|
| SL80486SX | 1 & 4, 2 & 5, 7 & 10, 8 & 9, 14 & 17, 15 & |
| | 18, 19 & 20, 22 & 23, 26 & 27 |
|--------------+---------------------------------------------|
| 80486DX | 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| CX486DX2 | 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & |
| | 21, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| SGS486DX2 | 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & |
| | 21, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| TI486DX2 | 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & |
| | 21, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| IBM486DX2 | 1 & 4, 2 & 3, 5 & 8, 7 & 10, 11 & 14, 18 & |
| | 21, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| 80486DX2 | 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| AM486DX4 | 1 & 2, 3 & 6, 13 & 16, 18 & 21, 19 & 20, 22 |
| | & 23, 25 & 26 |
|--------------+---------------------------------------------|
| (SL)AM486DX4 | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & |
| | 21, 19 & 20, 22 & 23, 26 & 27 |
|--------------+---------------------------------------------|
| P24D | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & |
| | 21, 19 & 20, 22 & 23, 26 & 27 |
|--------------+---------------------------------------------|
| P24T | 1 & 4, 2 & 5, 7 & 10, 8 & 9, 14 & 17, 15 & |
| | 18, 19 & 20, 22 & 23, 26 & 27 |
|--------------+---------------------------------------------|
| CX 5X86 | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & |
| | 21, 19 & 20, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| IBM 5X86 | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & |
| | 21, 19 & 20, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| SGS 5X86 | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & |
| | 21, 19 & 20, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| CX MISC | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 14 & 17, 18 & |
| | 21, 19 & 20, 23 & 24, 25 & 26 |
|--------------+---------------------------------------------|
| AM | 1 & 4, 2 & 5, 8 & 9, 10 & 11, 13, & 16, 14 |
| X5-133/150 | & 17, 18 & 21, 19 & 20, 22 & 23, 26 & 27 |
|--------------+---------------------------------------------|
| AM X5-160 | 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 |
|--------------+---------------------------------------------|
| AM DE2 | 1 & 2, 18 & 21, 19 & 20, 22 & 23, 25 & 26 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP1 | JP7 |
|------------+--------------------------+--------------------|
| 3.3v | Pins 1 & 3, 2 & 4 closed | Pins 1 & 3 closed |
|------------+--------------------------+--------------------|
| 3.45v | Pins 1 & 3, 2 & 4 closed | Pins 4 & 6 closed |
|------------+--------------------------+--------------------|
| 3.6v | Pins 1 & 3, 2 & 4 closed | Pins 3 & 5 closed |
|------------+--------------------------+--------------------|
| 4v | Pins 3 & 5, 4 & 6 closed | Open |
|------------+--------------------------+--------------------|
| 5v | Pins 1 & 3, 2 & 4 closed | Pins 2 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 INTERRUPT SELECTION |
|------------------------------------------------------------|
| Serial port 1 | Serial port 2 | JP18 |
|----------------+----------------+--------------------------|
| IRQ3 | IRQ4 | Pins 1 & 2, 3 & 4 closed |
|----------------+----------------+--------------------------|
| IRQ4 | IRQ3 | Pins 1 & 3, 2 & 4 closed |
|----------------+----------------+--------------------------|
| IRQ11 | IRQ10 | Pins 5 & 7, 6 & 8 closed |
|----------------+----------------+--------------------------|
| IRQ10 | IRQ11 | Pins 5 & 6, 7 & 8 closed |
|----------------+----------------+--------------------------|
| IRQ4 | IRQ10 | Pins 1 & 3, 7 & 8 closed |
|----------------+----------------+--------------------------|
| IRQ4 | IRQ11 | Pins 1 & 3, 6 & 8 closed |
|----------------+----------------+--------------------------|
| IRQ3 | IRQ10 | Pins 1 & 2, 7 & 8 closed |
|----------------+----------------+--------------------------|
| IRQ3 | IRQ11 | Pins 1 & 2, 5 & 7 closed |
|----------------+----------------+--------------------------|
| IRQ11 | IRQ3 | Pins 2 & 4, 5 & 6 closed |
|----------------+----------------+--------------------------|
| IRQ11 | IRQ4 | Pins 3 & 4, 5 & 6 closed |
|----------------+----------------+--------------------------|
| IRQ10 | IRQ3 | Pins 2 & 4, 5 & 7 closed |
|----------------+----------------+--------------------------|
| IRQ10 | IRQ4 | Pins 3 & 4, 5 & 7 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON BOARD VGA SELECTION |
|------------------------------------------------------------|
| Setting | JP4 | JP5 | JP6 |
|---------------+--------------+--------------+--------------|
| Enabled | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| Disabled | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WATCHDOG TIMER SELECTION |
|------------------------------------------------------------|
| Setting | JP16 |
|----------------------------+-------------------------------|
| Disabled | Open |
|----------------------------+-------------------------------|
| Reset | Pins 5 & 6 closed |
|----------------------------+-------------------------------|
| IRQ15 | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| NMI | Pins 1 & 2 closed |
+------------------------------------------------------------+