80486L-ISA Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed	20/25/33/50(internal)/50/66(internal)MHz
Chip Set	UNI
Max. Onboard DRAM	128MB
SRAM Cache	64/128/256KB
BIOS	AMI/Award
Dimensions	254mm x 218mm
I/O Options	32-bit local bus card slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
32-bit local bus card	CN1	Speaker	H4
Turbo switch	H1	Power LED & keylock	H5
Turbo LED	H2	External battery	JP1
Reset switch	H3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP12	open
	Monitor type select monochrome	JP12	closed

CPU TYPE CONFIGURATION
U26	U51	J4	J5	J7	J8
80486DX2	80486DX	pins 1 & 2 and 3 & 4	pins 1 & 2	closed	open
80486DX	80486DX	pins 1 & 2 and 3 & 4	pins 1 & 2	closed	open
80487SX	80486DX	pins 1 & 2 and 3 & 4	pins 2 & 3	closed	open
80486SX	80486DX	pins 2 & 3	open	closed	open
NONE	80486DX	pins 1 & 2 and 3 & 4	pins 1 & 2	open	closed
Note:Pins designated should be in the closed position. U51 is a surface mounted CPU (PQFP) that may or may not have been installed at the factory. U26 is a socketed CPU (PGA) that has been installed at the factory, or can be installed by the user.

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
64MB	(4) 16M x 9	NONE
80MB	(4) 16M x 9	(4) 4M x 9
128MB	(4) 16M x 9	(4) 16M x 9

SRAM JUMPER CONFIGURATION
Size	JP2	JP3
64KB	open	open
128KB	pins 2 & 3 closed	closed
256KB	pins 1 & 2 closed	closed

SRAM CONFIGURATION
Size	Cache SRAM	Location	TAG
64KB	(8) 8K x 8	Banks 0 & 1	(1) 8K x 8
128KB	(4) 32K x 8	Bank 0	(1) 8K x 8
256KB	(8) 32K x 8	Banks 0 & 1	(1) 32K x 8