FOREX 386/486 (REV. B2/B3) Motherboard Settings and Configuration

Processor	80386DX/80486SX/80487SX/80486DX /80486DX2
Processor Speed	20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set	FOREX
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387DX/3167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP2	Speaker	JP10
Reset switch	JP8	Turbo switch	JP15
Power LED & keylock	JP9	Turbo LED	JP16

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	2E	N/A
»	Factory configured - do not alter	JP5	N/A
»	CMOS memory normal operation	JP6	Open
	CMOS memory clear	JP6	Closed
Note: The location of JP5 is unidentified.

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	NONE
2MB	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE
5MB	(4) 256K x 9	(4) 1M 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

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

CACHE JUMPER CONFIGURATION
Size	JP8A	JP8B	JP8C	JP8E	JP8F
64KB	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2
128KB	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2
256KB	2 & 3	1 & 2	1 & 2	1 & 2	2 & 3
Note: Pins desingated should be in the closed position.

CPU TYPE CONFIGURATION
Type	JP12	JP13	JP30
80486SX	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
80487SX	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
80486DX	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	1A	1C	1D	1E	1F	1G	2A
80386	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
80486	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
Note: Pins designated should be in the closed position. The location of W1X & W2X are unidentified.

CPU TYPE CONFIGURATION (CON’T)
Type	2C	2D	2G	2H	W1B	W1X	W2X
80386	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
80486	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
Note: Pins designated should be in the closed position. The location of W1X & W2X are unidentified.

CPU CLOCK SPEED CONFIGURATION
Speed	JP7A	JP7B	JP7C	JP7D
20MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
25MHz	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
33MHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
40MHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
50iMHz	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
50MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
66iMHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
80MHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed