486 SERIES (MINI CASE) ASIC II (3 VESA SLOTS) Motherboard Settings and Configuration

Processor	80486SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	32MB
Cache	128/256KB
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (3), PS/2 mouse connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Front panel connector	J1	PS/2 mouse connector	J27
External battery	J3	Speaker	J29
Processor power connector	J10	32-bit VESA local bus slots	SL1 - SL3

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Battery type select internal	JP8	pins 1 & 2 closed
	Battery type select external	JP8	pins 2 & 3 closed
»	VESA card select supports write back cache	JP10	pins 1 & 2 closed
	VESA card select does not support write back cache	JP10	pins 2 & 3 closed
»	Factory configured - do not alter	JP14	pins 1 & 2 closed
»	Monitor type select CGA/EGA/VGA	JP19	Closed
	Monitor type select MDA/EGA/VGA	JP19	Open
»	CMOS memory normal operation	JP20	pins 1 & 2 closed
	CMOS memory clear	JP20	pins 2 & 3 closed
»	Mouse IRQ12 disabled	JP21	Open
	Mouse IRQ12 enabled	JP21	Closed
»	CPU type select all	JP32	Open
	CPU type select Pentium Overdrive	JP32	pins 2 & 3 closed
»	Factory configured - do not alter	JP33	pins 1 & 2 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
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 (Bank 0)	TAG (Bank 1)
128KB	(4) 32K x 8	NONE	(2) 8K x 8	(2) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(2) 8K x 8	(2) 8K x 8

CACHE JUMPER CONFIGURATION
Size	JP2
128KB	pins 1 & 2 closed
256KB	pins 2 & 3 closed

CPU UPGRADE CONFIGURATION
Type	JP1
None installed	pins 1 & 2 closed
SX/DX/DX2 series installed	pins 2 & 3, 4 & 5 closed
Overdrive series installed	pins 1 & 2, 5 & 6 closed
Note: There is a PQFP CPU installed but the location is unidentified. These CPU types are installed in the PGA socket.

CPU SPEED CONFIGURATION
Speed	JP13
25MHz	pins 5 & 6 closed
33MHz	pins 1 & 2, 3 & 4 closed
50iMHz	pins 5 & 6 closed
66iMHz	pins 1 & 2, 3 & 4 closed

CPU SPEED CONFIGURATION
Speed	JP11
2x	pins 1 & 2 closed
2.5x	pins 2 & 3 closed
3x	Open

BUS SPEED CONFIGURATION
CPU speed	JP9
<= 33MHz	pins 1 & 2 closed
> 33MHz	pins 2 & 3 closed

KEYBOARD CONFIGURATION
Type	JP12	JP15	JP16	JP17	JP18
Internal	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
External	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.