S26361-D756-X 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	64/128/256KB
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), video feature connector, VGA port, riser slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Front panel connector	CN1	Serial port 2	J20
Speaker	J13	Parallel port	J21
PS/2 mouse port	J15	Video feature connector	J23
IDE interface	J17	VGA port	J24
Floppy drive interface	J18	External battery	JP8
Serial port 1	J19	Riser slot	SL1

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Internal battery enabled	JP8	Pins 1 & 2 closed
	Internal battery disabled (CMOS memory clear)	JP8	Pins 2 & 3 closed
»	Monitor type select color	JP10	Open
	Monitor type select monochrome	JP10	Closed
»	PS/2 mouse IRQ12 enabled	JP11	Closed
	PS/2 mouse IRQ12 disabled	JP11	Open
»	On board video enabled	JP25	Pins 1 & 2 closed
	On board video disabled	JP25	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	None
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

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
128KB	(4) 32K x 8	None
256KB	(4) 32K x 8	(4) 32K x 8
Note: The locations of banks 0 & 1 are unidentified.

CACHE TAG CONFIGURATION
Size	U48	U49	U50
64KB	(1) 8K x 8	None	(1) 16K x 8
128KB	(1) 8K x 8	None	(1) 16K x 8
256KB	(1) 8K x 8	(1) 8K x 8	(1) 16K x 8
Note: The locations of U48, U49 & U50 are unidentified.

CACHE JUMPER CONFIGURATION
Size	JP12	JP13	JP14	JP15	JP16	JP17
None	2 & 3	2 & 3	Open	Open	Open	Open
64KB	2 & 3	2 & 3	Open	Open	Open	Open
128KB	1 & 2	1 & 2	Closed	Open	Open	Closed
256KB	2 & 3	2 & 3	Closed	Closed	Closed	Closed
Note: Pins designated should be in the closed position.

VIDEO MEMORY CONFIGURATION
Size	Bank 0	Bank 1
512KB	512KB	None
1MB	512KB	512KB
Note: The chips sizes are unidentified.

CPU SPEED SELECTION
Speed	JP5	JP6
25MHz	Closed	Open
33MHz	Open	Closed
50iMHz	Closed	Open
66iMHz	Open	Closed

CPU TYPE SELECTION
Type	JP1	JP2	JP3
80486SX	Open	Pins 1 & 2 closed	Open
80487SX	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
80486DX	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
80486DX2	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
Note: If upgrade socket is filled, JP1 must be open.

MISCELLANEOUS TECHNICAL NOTE

Note: The location of pin 1 on the jumpers and connectors are unidentified.