DIMENSION 386SX/25 Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	25MHz
Chip Set	VLSI Topcat
Max. Onboard DRAM	16MB
SRAM Cache	None
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	Floppy drive interface, IDE interface, Bus mouse port parallel port, serial port (2), VGA port
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port (COM A)	P3	VGA port	P10
Parallel port	P4	Reset switch	P11
Floppy drive interface	P5	Speaker	P12
IDE interface	P6	Power LED & keylock	P13
Serial port (COM B)	P7	Turbo LED	P14
Bus mouse	P9	IDE interface LED	P15

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	VGA port enabled	JP1 JP2	pins 2 & 3 closed pins 1 & 2 closed
	VGA port disabled	JP1 JP2	pins 1 & 2 closed pins 2 & 3 closed
»	Single IDE drive installed	JP3	pins 1 & 2 closed
	Dual IDE drive installed	JP3	pins 2 & 3 closed
»	Pipeline mode enabled	JP4	pins 2 & 3 closed
	Pipeline mode disabled	JP4	pins 1 & 2 closed
»	Floppy drive disk change signal disabled	JP5	pins 1 & 2 closed
	Floppy drive disk change signal enabled	JP5	pins 2 & 3 closed
»	Monitor type select color	JP6	pins 1 & 2 closed
	Monitor type select monochrome	JP6	pins 2 & 3 closed
»	CMOS memory normal operation	JP7	pins 2 & 3 closed
	CMOS memory clear	JP7	pins 1 & 2 closed
»	Monitor type select Non-MultiSync I	SW1/switch 1	open
	Monitor type select MultiSync I	SW1/switch 1	closed
»	VGA style select PS/2	SW1/switch 2	closed
	VGA style select AT	SW1/switch 2	open
»	Select 1024 x 768 interlaced	SW1/switch 5	open
	Select 1024 x 768 non-interlaced	SW1/switch 5	closed

REFRESH RATE CONFIGURATION
Mode 800 x 600	SW1/switch 3	SW1/switch 4
16 colors @ 72Hz/256 colors @ 60Hz	open	open
16 colors @ 60Hz/256 colors @ 60Hz	open	closed
16 colors @ 72Hz/256 colors @ 56Hz	closed	open
16 colors @ 56Hz/256 colors @ 56 Hz	closed	closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(2) 256K x 9	(2) 256K x 9
2MB	(2) 1M x 9	NONE
4MB	(2) 1M x 9	(2) 1M x 9
8MB	(2) 4M x 9	NONE
10MB	(2) 4M x 9	(2) 1M x 9
16MB	(2) 4M x 9	(2) 4M x 9