GMB-486UN (VER. 3.00) Motherboard Settings and Configuration

Device Type	Mainboard
Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/50/66MHz
Chip Set	Unidentified
Maximum Onboard Memory	32MB DRAM
Cache	32/64/128/256KB
BIOS	Acer
I/O Options	None

CONNECTIONS
External battery	JP1	Turbo LED	JP16
Reset switch	JP14	Speaker	JP17
Turbo switch	JP15	Power LED & keylock	JP18

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	CMOS memory normal operation	JP2	Pins 1 & 2 closed
	CMOS memory clear	JP2	Pins 2 & 3 closed
»	Hardware emulate KBGA20	JP10	Pins 1 & 2 closed
	Keyboard controller 8042	JP10	Pins 2 & 3 closed
»	Color display enabled	JP12	Closed
	Monochrome display enabled	JP12	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256KB x 9	None
2MB	(4) 256KB x 9	(4) 256KB x 9
4MB	(4) 1MB x 9	None
5MB	(4) 1MB x 9	(4) 256KB x 9
8MB	(4) 1MB x 9	(4) 1MB x 9
16MB	(4) 4MB x 9	None
17MB	(4) 4MB x 9	(4) 256KB x 9
20MB	(4) 4MB x 9	(4) 1KB x 9
32MB	(4) 4MB x 9	(4) 4MB x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
32KB	(4) 8K x 8	None	(1) 8K x 8
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	JP22	JP23	JP25	JP26
32KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
64KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
128KB	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
256KB	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed

CACHE JUMPER CONFIGURATION (CONT.)
Size	JP27	JP28	JP29	JP30
32KB	Closed	Open	Open	Open
64KB	Open	Closed	Open	Open
128KB	Open	Open	Closed	Open
256KB	Open	Open	Open	Closed

CPU SPEED SELECTION
Speed	JP3	JP7	JP9	JP13
25MHz	2 & 3	Open	2 & 3	2 & 3
33MHz	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
50MHz (DX)	2 & 3	1 & 2	1 & 2, 3 & 4	1 & 2
50MHz (DX2)	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
66MHz	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2