Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33/50MHz
Chip Set	OPTI
Max. Onboard DRAM	128MB
SRAM Cache	64/128/256/512KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J4	Reset switch	S9
Power LED & keylock	J5

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	EISA cards configured as ISA	JP1	Closed
	EISA cards configured as EISA	JP1	Open
»	I/O bus speed select synchronous with chipset	JP4	pins 1 & 2 closed
	I/O bus speed select 8MHz	JP4	pins 2 & 3 closed
»	Monitor type select color	JP5	Closed
	Monitor type select monochrome	JP5	Open
»	Reserved for future applications	JP7	N/A
»	Clock frequency select single	JP9	pins 1 & 2 closed
	Clock frequency select double	JP9	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	NONE
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
64MB	(4) 16M x 9	NONE
128MB	(4) 16M x 9	(4) 16M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	U51	U52	U53	U66
64KB	(4) 8K x 8	(4) 8K x 8	(1) 64K x 1	(1) 8K x 8	NONE	(1) 16K x 1
128KB	(4) 32K x 8	NONE	(1) 64K x 1	(1) 8K x 8	NONE	(1) 16K x 1
256KB	(4) 32K x 8	(4) 32K x 8	(1) 64K x 1	(1) 8K x 8	(1) 8K x 8	(1) 16K x 1
512KB	(4) 128K x 8	NONE	(1) 64K x 1	(1) 32K x 8	NONE	(1) 64K x 1

CACHE JUMPER CONFIGURATION
Size	JP11	JP12	JP13	JP14	JP15	JP16
64KB	Open	Open	Open	Open	Open	Open
128KB	Open	Open	Closed	Open	Closed	Open
256KB	Open	Closed	Closed	Closed	Closed	Open
512KB	Closed	Closed	Closed	Closed	Closed	Closed

CPU TYPE CONFIGURATION
Type	JP8	JP10
80486SX	pins 2 & 3 closed	open
80487SX	pins 1 & 2, 3 & 4 closed	pins 1 & 2 closed
80486DX	pins 1 & 2, 3 & 4 closed	pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	JP2	JP3
25MHz	Open	Open
33MHz	Closed	Open
40MHz	Open	Closed
50MHz	Closed	Closed