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# AXIOM TECHNOLOGY, INC.
SBC8251
Processor Cyrix/Pentium
Processor Speed 75/90/100/120/133/150/166/180/200MHz
Chip Set Intel
Video Chip Set Chips and Technology
Maximum Onboard 64MB
Memory
Maximum Video 2MB
Memory
Cache 256/512KB
BIOS Unidentified
Dimensions 185mm x 122mm
I/O Options Floppy drive interface, IDE interface,
parallel port, PS/2 mouse port, PS/2 mouse
interface, serial ports (2), VGA port, PC/104
connectors (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+-----------------+-------------|
| PS/2 mouse port | CN1 | Internal buzzer | JP12/pins |
| | | | 1- 3 |
|-----------------+----------+-----------------+-------------|
| VGA port | CN2 | Power LED & | JP12/pins 2 |
| | | keylock | - 10 |
|-----------------+----------+-----------------+-------------|
| Serial port 1 | CN3 | External | JP12/pins 4 |
| | | speaker | - 7 |
|-----------------+----------+-----------------+-------------|
| Parallel port | CN4 | Green PC | JP12/pins 5 |
| | | connector | & 9 |
|-----------------+----------+-----------------+-------------|
| Floppy drive | CN5 | Reset switch | JP12/pins |
| interface | | | 11 & 12 |
|-----------------+----------+-----------------+-------------|
| IDE interface | CN6 | IDE interface | JP12/pins |
| | | LED | 17 & 18 |
|-----------------+----------+-----------------+-------------|
| Serial port 2 | CN7 | Watchdog timer | JP3/pins 19 |
| | | | & 20 |
|-----------------+----------+-----------------+-------------|
| Power connector | J1 | PC/104 | P1 |
| | | connector | |
|-----------------+----------+-----------------+-------------|
| Power connector | J3 | PC/104 | P2 |
| | | connector | |
|-----------------+----------+-----------------+-------------|
| Keyboard, PS/2 | J4 | | |
| mouse | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | J2 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | SHFCLK normal operation | JP5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | SHFCLK inverted | JP5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS write protect | JP7 | Pins 1 & 2 |
| | disabled | | closed |
|---+---------------------------------+-------+--------------|
| | Flash BIOS write protect | JP7 | Pins 2 & 3 |
| | enabled | | closed |
|---+---------------------------------+-------+--------------|
| » | CMOS memory normal operation | JP8 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | JP8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Cache type select write back | JP10 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Cache type select write through | JP10 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | System clock = PCI clock/4 | JP13 | Open |
|---+---------------------------------+-------+--------------|
| | System clock = PCI clock/3 | JP13 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 8MB | (2) 1M x 36 |
|----------------------------+-------------------------------|
| 16MB | (2) 2M x 36 |
|----------------------------+-------------------------------|
| 32MB | (2) 4M x 36 |
|----------------------------+-------------------------------|
| 64MB | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM REFRESH RATE CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP16/pins 1 & 2 |
|----------------------------+-------------------------------|
| 60MHz | Closed |
|----------------------------+-------------------------------|
| 66MHz | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: The location of the cache is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP16 |
|----------------------------+-------------------------------|
| 256KB | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 512KB | Pins 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Note: The location of the video memory is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU BUS SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP18 |
|----------------------------+-------------------------------|
| 50MHz | Pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 55MHz | Open |
|----------------------------+-------------------------------|
| 60MHz | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 66MHz | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU BUS/CORE SELECTION |
|------------------------------------------------------------|
| Bus/Core | JP16 |
|----------------------------+-------------------------------|
| 2/5 | Pins 7 & 8, 9 & 10 closed |
|----------------------------+-------------------------------|
| 1/3 | Pins 9 & 10 closed |
|----------------------------+-------------------------------|
| 1/2 | Pins 7 & 8closed |
|----------------------------+-------------------------------|
| 2/3 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP9 |
|----------------------------+-------------------------------|
| Cyrix | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Intel | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (SINGLE) |
|------------------------------------------------------------|
| Voltage | JP1 |
|----------------------------+-------------------------------|
| 3.3v | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3.6v | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION (DUAL) |
|------------------------------------------------------------|
| Voltage | JP2 |
|----------------------------+-------------------------------|
| 2.7v | Pins 4 & 6 closed |
|----------------------------+-------------------------------|
| 2.9v | Pins 2 & 4 closed |
|----------------------------+-------------------------------|
| 3.3v | Pins 1 & 3 closed |
|----------------------------+-------------------------------|
| 3.45v | Pins 3 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 SELECTION |
|------------------------------------------------------------|
| Setting | JP11 | JP17 |
|--------------+-----------+---------------------------------|
| RS232 | 5 & 6 | 3 & 5, 4 & 6, 9 & 11, 10 & 12 |
|--------------+-----------+---------------------------------|
| RS422 | 3 & 4 | 1 & 3, 2 & 4, 7 & 9, 8 & 10 |
|--------------+-----------+---------------------------------|
| RS485 | 1 & 2 | 1 & 3, 2 & 4, 7 & 9, 8 & 10 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LCD PANEL INTERFACE SELECTION |
|------------------------------------------------------------|
| Setting | JP6 | JP15 |
|--------------------+------------------+--------------------|
| 3.3v panel | Closed | Pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 5v panel | Open | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LCD PANEL TYPE SELECTION |
|------------------------------------------------------------|
| Note: Pins 9 & 10, 11 & 12, 13 & 14, 15 & 16 on JP3 are |
| used to select up to 16 typed of LED BIOS. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISK ON CHIP ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | JP3 |
|----------------------------+-------------------------------|
| C0000 – C7FFF | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| C8000 – CFFFF | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| D0000 – D7FFF | Pins 5 & 6 closed |
|----------------------------+-------------------------------|
| D8000 – DFFFF | Pins 7 & 8 closed |
+------------------------------------------------------------+