486/MV Motherboard Settings and Configuration

Device Type	Mainboard
Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Unidentified
Video Chip Set	Unidentified
Maximum Onboard Memory	40MB
Maximum Video Memory	1MB
Cache	64/128/256KB
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), riser slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Parallel port	CN1	Floppy drive interface	CN5
Serial port	CN2	IDE interface	CN6
Serial port	CN3	Riser slot	SL1
PS/2 mouse port	CN4	32-bit VESA local bus slot	SL2
Note: CN1 – CN6 are for general location purposes. The location may not be exact.

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	C1	Unidentified
»	Factory configured - do not alter	C2	Unidentified
»	Factory configured - do not alter	J2	Unidentified
»	Factory configured - do not alter	J8	Unidentified
»	Factory configured - do not alter	J9	Unidentified
»	CMOS memory normal operation	J10	Pins 2 & 3 closed
	CMOS memory clear	J10	Pins 1 & 2 closed
»	Factory configured - do not alter	J11	Unidentified
»	Password enabled	SW1/4	Off
	Password disabled	SW1/4	On
»	Monitor type select color	SW1/5	On
	Monitor type select monochrome	SW1/5	Off
»	Cache disabled	SW1/6	Off
	Cache enabled	SW1/6	On

SIMM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
4MB	4MB	None	None	None
8MB	4MB	(1) 1M x 36	None	None
12MB	4MB	(1) 1M x 36	(1) 1M x 36	None
16MB	4MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
20MB	4MB	(1) 4M x 36	None	None
24MB	4MB	(1) 1M x 36	(1) 4M x 36	None
36MB	4MB	(1) 4M x 36	(1) 4M x 36	None
40MB	4MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
Note: Bank 0 is factory installed and is not configurable.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	Unidentified
128KB	(4) 32K x 8	None	Unidentified
256KB	(4) 32K x 8	(4) 32K x 8	Unidentified

CACHE JUMPER CONFIGURATION
Size	J4	J5	J6	J7
None	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
64KB	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
128KB	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
256KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed

VIDEO MEMORY CONFIGURATION

Note: Board accepts 512KB/1MB of video memory. The location and chip sizes are unidentified.

CPU SPEED SELECTION
Speed	SW1/1	SW1/2	SW1/3
25MHz	Off	Off	On
33MHz	On	On	Off
50iMHz	Off	Off	On
66iMHz	On	On	Off

CPU TYPE SELECTION
Type	J1
80486SX	Pins 2 & 3 closed
80486DX	Pins 1 & 2 closed
80486DX2	Pins 1 & 2 closed