LASER 486 MODULAR EISA Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	16/20/25/33/50(internal)/66(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	96MB (with two memory cards installed)
Cache	64/128KB
BIOS	Unidentified
Dimensions	330mm x 220mm
I/O Options	External memory cards (2), external CPU card, PS/2 mouse port
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
PS/2 mouse connector	J7	Diagnostic connector	J32
Speaker	J9	External memory cards	SL1 & SL2
Front panel connector	J10	External CPU card	SL3
External battery	J12

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	EISA bus controller speed select 25MHz	JP1	Closed
	EISA bus controller speed select 33MHz	JP1	Open
»	BIOS type select 27512	JP2	Closed
	BIOS type select 27010	JP2	Open
»	Battery type select internal	JP3	pins 2 & 3 closed
	Battery type select external	JP3	pins 1 & 2 closed
»	Real time clock select MC146818A	JP4	Closed
	Real time clock select MC146818 or HD146818	JP4	Open
»	Parity check enabled	JP5	Closed
	Parity check disabled	JP5	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
1MB	(4) 256K x 9	NONE	NONE
2MB	(4) 256K x 9	(4) 256K x 9	NONE
3MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE	NONE
5MB	(4) 256K x 9	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE
9MB	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE	NONE
16MB	(4) 4M x 9	NONE	NONE
17MB	(4) 256K x 9	(4) 4M x 9	NONE
20MB	(4) 1M x 9	(4) 4M x 9	NONE
20MB	(4) 4M x 9	(4) 1M x 9	NONE
24MB	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9	NONE

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2
33MB	(4) 256K x 9	(4) 4M x 9	(4) 4M x 9
36MB	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9
48MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9
Note: In order to have 96MB, use two memory cards.

CONNECTIONS
Purpose	Location
Chassis fan power	J2

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	JP2	N/A

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
128KB	(4) 32K x 8	NONE
Note: The orientation of the cache banks are unidentified.

CPU TYPE CONFIGURATION
Type	JP1
80486SX	pins 5 & 6 closed
80487SX	pins 2 & 3, 4 & 5, 6 & 7 closed
80486DX	pins 1 & 2, 4 & 5, 6 & 7 closed
80486DX2	pins 1 & 2, 4 & 5, 6 & 7 closed

CPU SPEED CONFIGURATION
Speed	JP3	JP4	JP5
16MHz	Closed	Closed	Closed
20MHz	Closed	Closed	Open
25MHz	Closed	Open	Closed
33MHz	Closed	Open	Open
50iMHz	Closed	Open	Closed
66iMHz	Closed	Open	Open