4825 SX Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Unidentified
Video Chip Set	Unidentified
Maximum Onboard Memory	32MB
Maximum Video Memory	1MB
Cache	None
BIOS	Unidentified
Dimensions	394mm x 381mm
I/O Options	Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
VGA port	CN1	IDE interface	CN8
PS/2 mouse port	CN2	External battery	J1
Parallel port	CN3	Speaker	J2
Serial port 2	CN4	Reset switch	J3
Serial port 1	CN5	Power LED	J4
VGA feature connector	CN6	Riser slot	SL1
Floppy drive interface	CN7

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	CMOS memory normal operation	JP1	Open
	CMOS memory clear	JP1	Closed
»	Monitor frequency select 31KHz	SW1/5	Off
	Monitor frequency select 40KHz	SW1/5	On
»	Monitor type select color	SW2/3	Off
	Monitor type select monochrome	SW2/3	On

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	None
5MB	(4) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	None
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9

VIDEO MEMORY CONFIGURATION
Size	Bank 0	Bank 1
512KB	512KB	None
1MB	512KB	512KB
Note: The location of banks 0 & 1 are unidentified. The size of the video memory chips are unidentified.

VIDEO MEMORY SWITCH CONFIGURATION
Size	SW1/6
512KB	On
1MB	Off

CPU TYPE SELECTION
Type	SW2/1	SW2/2
80486SX	Off	Off
80487SX	On	Off
80486DX	Off	Off
80486DX2	Off	Off

VIDEO RESOLUTION SELECTION (800 X 600)
Frequency		SW1/1	SW1/2
»	56Hz	Off	Off
	60Hz	Off	On
	72Hz	On	Off
	56Hz	On	On

VIDEO RESOLUTION SELECTION (1024 X 768)
Frequency		SW1/3	SW1/4
»	Interlaced	Off	Off
	60HZ non-interlaced	Off	On
	70HZ non-interlaced	On	Off
	Interlaced	On	On

ON BOARD VIDEO SELECTION
Setting		SW1/7	SW1/8
»	Enabled	On	Off
	Disabled	Off	On