4DX2-66 Motherboard Settings and Configuration

Processor	80486DX/ODP486DX/80486DX2/80486DX4/P24D/P24T
Processor Speed	25/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Chip Set	Unidentified
Video Chip Set	Cirrus Logic
Maximum Onboard Memory	64MB
Maximum Video Memory	1MB
Cache	128KB
BIOS	Phoenix
Dimensions	254mm x 218mm
I/O Options	32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VESA feature connector, VGA port
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
VESA feature connector	CN1	IDE interface 1	J21
PS/2 mouse port	J1	Power LED & keylock	J29
VGA port	J4	Reset switch	J32
Serial port 1	J12	IDE interface LED	J34
Serial port 2	J13	Speaker	J37
Parallel port	J17	Turbo LED	J40
Floppy drive interface	J18	Chassis fan power	J41
IDE interface 2	J19	32-bit PCI slots	PC1 - PC3

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Secondary IDE DMA disabled	J26	Pins 2 & 3 closed
	Secondary IDE DMA enabled	J26	Pins 1 & 2 closed
»	Password normal operation	J31	Open
	Password clear	J31	Closed
»	Boot block normal operation	J35	Pins 2 & 3 closed
	Boot block boot from floppy	J35	Pins 1 & 2 closed
»	On board I/O enabled	J36	Pins 2 & 3 closed
	On board I/O disabled	J36	Pins 1 & 2 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(1) 1M x 36	None
8MB	(1) 1M x 36	(1) 1M x 36
8MB	(1) 2M x 36	None
12MB	(1) 2M x 36	(1) 1M x 36
16MB	(1) 2M x 36	(1) 2M x 36
16MB	(1) 4M x 36	None
20MB	(1) 4M x 36	(1) 1M x 36
24MB	(1) 4M x 36	(1) 2M x 36
32MB	(1) 4M x 36	(1) 4M x 36
32MB	(1) 8M x 36	None
36MB	(1) 1M x 36	(1) 8M x 36
40MB	(1) 2M x 36	(1) 8M x 36
48MB	(1) 4M x 36	(1) 8M x 36
64MB	(1) 8M x 36	(1) 8M x 36
Note: Board also accepts x 32 SIMMs. Banks are interchangeable.

DRAM TYPE CONFIGURATION
Type	J30
x 32 SIMMs	Pins 2 & 3 closed
x 36 SIMMs	Pins 1 & 2 closed

CACHE CONFIGURATION
Size	Bank 0
128KB	128KB
Note: The location of bank 0 is unidentified. The size of the cache chips are unidentified.

CACHE JUMPER CONFIGURATION
Size	J24	J25
128KB	Pins 2 & 3 closed	Pins 2 & 3 closed

VIDEO MEMORY CONFIGURATION

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

CPU SPEED SELECTION
Speed	J39
25MHz	Pins 2 & 3 closed
50iMHz	Pins 2 & 3 closed
66iMHz	Pins 1 & 2 closed
75iMHz	Pins 2 & 3 closed
100iMHz	Pins 1 & 2 closed

CPU TYPE SELECTION
Type	J38
80486DX	Pins 3 & 4 closed
ODP486DX	Pins 1 & 2 closed
80486DX2	Pins 3 & 4 closed
8086DX4	Pins 3 & 4 closed
P24D	Pins 5 & 6 closed
P24T	Pins 5 & 6 closed

CPU TYPE SELECTION
Type		J27
»	SL-series	Pins 2 & 3 closed
	Non SL-series	Pins 1 & 2 closed
Note: Do not change this from the default setting.

CPU MULTIPLIER SELECTION
Multiplier		J33
	Reserved	Pins 1 & 2 closed
	2x	Pins 2 & 3 closed
»	3x	Open

CPU VOLTAGE SELECTION
Voltage		J3
	3.3v	Pins 1 & 3, 2 & 4 closed
»	5v	Pins 3 & 5, 4 & 6 closed

DMA CHANNEL SELECTION
Channel		J22	J23
»	1	Pins 1 & 2 closed	Pins 1 & 2 closed
	3	Pins 2 & 3 closed	Pins 2 & 3 closed