US3486-33/50C(USAi) Motherboard Settings and Configuration

Processor	80386SX/80386DX/CX486DLC/80486SX/80486DX/80486DX2
Processor Speed	20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Chip Set	USAi
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	230mm x 218mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	80387

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J2	External battery	J7
Turbo switch	J4	Speaker	J100
Turbo LED	J5	32-bit VESA Local bus slots	SL1 & SL2
Reset switch	J6

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	J3	Open
	Monitor type select color	J3	Closed
»	CMOS memory normal operation (Internal Battery)	JMP3	pins 2 & 3 closed
	CMOS memory normal operation (External Battery)	JMP3	pins 1 & 2 closed
	CMOS memory clear	JMP3	pins 2 & 4 closed
»	NPU disabled	JMP4	pins 2 & 3 closed
	NPU enabled	JMP4	pins 1 & 2 closed
»	CPU type select 80386DX not installed	JMP5	Open
	CPU type select 80386DX installed	JMP5	Closed
»	CPU type select 80486DX-50 not installed	JMP7	Open
	CPU type select 80486DX-50 installed	JMP7	Closed

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
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
32MB	(4) 4M x 9	(4) 4M x 9

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

CACHE JUMPER CONFIGURATION
Size	JMP1	JMP8
64KB	pins 1 & 2, 4 & 5, 7 & 8 closed	pins 1 & 2, 4 & 5 closed
128KB	pins 2 & 3, 5 & 6, 8 & 9 closed	pins 2 & 3, 5 & 6 closed
256KB	pins 2 & 3, 5 & 6, 8 & 9 closed	pins 2 & 3, 5 & 6 closed

CPU TYPE CONFIGURATION
Type	JMP10	JMP12
80386	pins 2 & 5, 3 & 6 closed	Open
80486	Open	Closed

CPU TYPE CONFIGURATION
Type	JMP2
80486SX	pins 1 & 2 closed
80486DX	pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	JMP9
20MHz	pins 2 & 6, 3 & 7 closed
25MHz	pins 2 & 6, 4 & 8 closed
33MHz	pins 3 & 7, 4 & 8 closed
40MHz	pins 2 & 6 closed
50MHz	pins 3 & 7 closed
66iMHz	pins 1 & 5, 3 & 7, 4 & 8 closed

VESA BUS SPEED CONFIGURATION
Speed	JMP6
80486DX-33/DX2-66	pins 1 & 4, 3 & 6 closed
80486DX-50	pins 1 & 4 closed