2500 SX/20 Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	20MHz
Chip Set	Unidentified
Video Chip Set	Unidentified
Maximum Onboard Memory	5MB
Maximum Video Memory	Unidentified
Cache	None
BIOS	Unidentified
Dimensions	254mm x 218mm
I/O Options	Floppy drive interface, IDE interface, serial port, parallel port, PS/2 mouse port, riser slot
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Floppy drive interface	CN1	IDE interface LED	J1
IDE interface	CN2	Riser slot	SL1
The location of the serial port, parallel port and PS/2 mouse port is unidentified.

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Audio input source select microphone	JP1	Pins 1 & 2 closed
	Audio input source select line level	JP1	Pins 2 & 3 closed
»	Audio output source select headphone	JP2	Pins 1 & 2 closed
	Audio output source select line level	JP2	Pins 2 & 3 closed
»	Monitor type select VGA analog or standard multiple frequency	JP3	Pins 1 & 2 closed
	Monitor type select non standard multiple frequency	JP3	Pins 2 & 3 closed
»	VGA BIOS select PS/2 mode	JP4	Pins 2 & 3 closed
	VGA BIOS select AT mode	JP4	Pins 1 & 2 closed
»	Video IRQ9 disabled	JP5	Open
	Video IRQ9 enabled	JP5	Pins 1 & 2 closed
»	On board video enabled	JP6	Pins 1 & 2 closed
	On board video disabled	JP6	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
1.5MB	1MB	(2) 256K x 9	None
2MB	1MB	(2) 256K x 9	(2) 256K x 9
3MB	1MB	(2) 1M x 9	None
5MB	1MB	(2) 1M x 9	(2) 1M x 9
Note: Bank 0 is factory installed and is not configurable. The location is unidentified.