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SBC8251

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 Memory

64MB

Maximum Video Memory

2MB

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

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

CN1

Internal buzzer

JP12/pins 1- 3

VGA port

CN2

Power LED & keylock

JP12/pins 2 - 10

Serial port 1

CN3

External speaker

JP12/pins 4 - 7

Parallel port

CN4

Green PC connector

JP12/pins 5 & 9

Floppy drive interface

CN5

Reset switch

JP12/pins 11 & 12

IDE interface

CN6

IDE interface LED

JP12/pins 17 & 18

Serial port 2

CN7

Watchdog timer

JP3/pins 19 & 20

Power connector

J1

PC/104 connector

P1

Power connector

J3

PC/104 connector

P2

Keyboard, PS/2 mouse

J4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter

J2

Unidentified

SHFCLK normal operation

JP5

Pins 2 & 3 closed

 

SHFCLK inverted

JP5

Pins 1 & 2 closed

 

Flash BIOS write protect disabled

JP7

Pins 1 & 2 closed

 

Flash BIOS write protect enabled

JP7

Pins 2 & 3 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