CELEBRIS 486 Motherboard Settings and Configuration

Device Type	Mainboard
Processor	80486SX/80486DX/80486DX2/P24D/P24T/P24CT
Processor Speed	25/33/50(internal)/66(internal)/100(internal)MHz
Chip Set	Unidentified
Video Chip Set	Unidentified
Maximum Onboard Memory	128MB
Maximum Video Memory	1MB
Cache	256KB
BIOS	Unidentified
Dimensions	254mm x 218mm
I/O Options	Floppy drive interface, IDE interface, PS/2 mouse port, riser slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Chassis fan power	C1	PS/2 mouse port	CN4
Speaker	C2	Floppy drive interface	CN5
VGA port	CN1	IDE interface	CN6
Serial port	CN2	Riser slot	SL1
Parallel port	CN3
Note: VGA & serial port are shown for informational purposes only. The location may not be exact.

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	EEPROM write control disabled	J24	Pins 2 & 3 closed
	EEPROM write control enabled	J24	Pins 1 & 2 closed
»	Setup control disabled	J25	Pins 2 & 3 closed
	Setup control enabled	J25	Pins 1 & 2 closed
»	Floppy drive write control disabled	J26	Pins 2 & 3 closed
	Floppy drive write control enabled	J26	Pins 1 & 2 closed

SIMM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
8MB	(1) 2M x 36	None	None	None
16MB	(1) 4M x 36	None	None	None
16MB	(1) 2M x 36	(1) 2M x 36	None	None
24MB	(1) 4M x 36	(1) 2M x 36	None	None
24MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	None
24MB	(1) 2M x 36	(1) 4M x 36	None	None
32MB	(1) 8M x 36	None	None	None
32MB	(1) 4M x 36	(1) 2M x 36	(1) 2M x 36	None
32MB	(1) 4M x 36	(1) 4M x 36	None	None
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
40MB	(1) 8M x 36	(1) 2M x 36	None	None
40MB	(1) 4M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
40MB	(1) 2M x 36	(1) 4M x 36	(1) 4M x 36	None
40MB	(1) 2M x 36	(1) 8M x 36	None	None
48MB	(1) 8M x 36	(1) 2M x 36	(1) 2M x 36	None
48MB	(1) 8M x 36	(1) 4M x 36	None	None
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	None

SIMM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
48MB	(1) 4M x 36	(1) 8M x 36	None	None
56MB	(1) 8M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
56MB	(1) 2M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 8M x 36	(1) 4M x 36	(1) 4M x 36	None
64MB	(1) 8M x 36	(1) 8M x 36	None	None
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
72MB	(1) 2M x 36	(1) 8M x 36	(1) 8M x 36	None
80MB	(1) 8M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
80MB	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36	None
96MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	None
104MB	(1) 2M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
112MB	(1) 4M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
128MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36

CACHE CONFIGURATION

Note: 256KB cache is factory installed and is not configurable. The location is unidentified.

VIDEO MEMORY CONFIGURATION

Note: 1MB video memory is factory installed and is not configurable. The location is unidentified.

CPU SPEED SELECTION
Speed	J6
25MHz	Pins 2 & 3 closed
33MHz	Pins 1 & 2 closed
50iMHz	Pins 2 & 3 closed
66iMHz	Pins 1 & 2 closed
100iMHz	Pins 1 & 2 closed

CPU TYPE SELECTION
Type	J50
80486SX	Open
80486DX	Open
80486DX2	Open
P24D	Closed
P24T	Closed
P24CT	Closed

SERIAL BOOT CONTROL SELECTION
Setting	J7	J8
Disabled	Pins 2 & 3 closed	Pins 2 & 3 closed
Enabled	Pins 1 & 2 closed	Pins 1 & 2 closed