Processor	80486SX/80486DX/80486DX2
Processor Speed	20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	64MB
Cache	64/128/256KB
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (2), floppy drive interface, green PC connector, green VGA connector, IDE interface, SCSI connector, parallel port, PS/2 mouse port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	CO1	Chassis fan power	J9
Serial port 2	CO2	LED connector	J10
External battery	J3	Optional keyboard/mouse	J11
Green VGA connector	J4	IDE interface LED	J12
Green PC connector	J5	PS/2 mouse port	JX2
SCSI interface	J6	Parallel port	PT1
IDE interface	J7	32-bit VESA local bus slots	SL1 & SL2
Floppy drive interface	J8

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Password disabled	JP1	pins 2 & 3 closed
	Password enabled	JP1	pins 1 & 2 closed
»	Acer copyright enabled	JP2	pins 1 & 2 closed
	Acer copyright disabled	JP2	pins 2 & 3 closed
»	SCSI I/O address select 340-35F	JP6	Open
	SCSI I/O address select 140-15F	JP6	Closed
»	M5105 enabled	JP7	Closed
	M5105 disabled	JP7	Open
»	Bidirectional parallel port enabled	JP8	Closed
	Bidirectional parallel port disabled	JP8	Open
»	Battery type select internal	JP9	Closed
	Battery type select external	JP9	Open
»	Reset key enabled	JP23	Closed
	Reset key disabled	JP23	Open
»	Keylock disabled	JP24	Closed
	Keylock enabled	JP24	Open

DRAM CONFIGURATION
Size	On board	Bank 0	Bank 1	Bank 2	Bank 3
4MB	4MB	NONE	NONE	NONE	NONE
8MB	4MB	NONE	(1) 1M x 36	NONE	NONE
12MB	4MB	NONE	(1) 1M x 36	(1) 1M x 36	NONE
16MB	4MB	NONE	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	Disabled	(1) 4M x 36	NONE	NONE	NONE
20MB	4MB	NONE	(1) 4M x 36	NONE	NONE
24MB	4MB	NONE	(1) 1M x 36	(1) 4M x 36	NONE
32MB	Disabled	(1) 4M x 36	(1) 4M x 36	NONE	NONE
36MB	4MB	NONE	(1) 4M x 36	(1) 4M x 36	NONE
40MB	4MB	NONE	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
48MB	Disabled	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
64MB	Disabled	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
Note: This board has 4MB of memory factory installed. If memory is disabled, use the DRAM jumper configuration table.

DRAM JUMPER CONFIGURATION
Type	JP15
On board 4MB RAM enabled	pins 2 & 3 closed
On board 4MB RAM disabled	pins 1 & 2 closed

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG	TAG (DIRTY)
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8 or 32K x 8	(1) 16K x 4
128KB	(4) 32K x 8	NONE	(1) 8K x 8 or 32K x 8	(1) 16K x 4
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8	(1) 16K x 4
Note: The orientation of the cache banks and TAG banks are unidentified.

CACHE JUMPER CONFIGURATION
Size	JP20	JP21	JP22
64KB	pins 2 & 3 closed	Open	Open
128KB	pins 1 & 2 closed	Closed	Open
256KB	pins 2 & 3 closed	Closed	Closed

CPU SPEED CONFIGURATION
Speed	JP10
20MHz	pins 1 & 6 closed
25MHz	pins 2 & 7 closed
33MHz	pins 3 & 8 closed
40MHz	pins 4 & 9 closed
50iMHz	pins 2 & 7 closed
50MHz	pins 5 & 10 closed
66iMHz	pins 3 & 8 closed

VESA WAIT STATE CONFIGURATION
Wait state	JP11
0 wait states	Open
1 wait state	Closed

SCSI IRQ CONFIGURATION
IRQ	JP3
Disabled	Open
IRQ10	pins 1 & 2 closed
IRQ11	pins 2 & 3 closed

SCSI DMA CONFIGURATION
DMA	JP4	JP5
Disabled	Open	Open
DMA 5	pins 1 & 2 closed	pins 1 & 2 closed
DMA 6	pins 2 & 3 closed	pins 2 & 3 closed