YL-A05 Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	20/25MHz
Chip Set	ACC
Max. Onboard DRAM	8MB
Cache	None
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit external memory card slot
NPU Options	80387

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP2	Turbo LED	JP16
Turbo switch	JP13	Speaker	JP17
Power LED & keylock	JP14	32-bit external memory card	S1
Reset switch	JP15

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Battery select internal	JP1	pins 1 & 2 closed
	Battery select external	JP1	pins 2 & 3 closed
»	Monitor type select color	JP3	pins 2 & 3 closed
	Monitor type select monochrome	JP3	pins 1 & 2 closed
»	Factory configured - do not alter	JP4	N/A
»	Pipeline mode enabled	JP5	pins 1 & 2 closed
	Pipeline mode disabled	JP5	pins 2 & 3 closed
»	NPU mode select synchronous	JP6	pins 1 & 2 closed
	NPU mode select asynchronous	JP6	pins 2 & 3 closed
»	NPU disabled	JP12	Open
	NPU enabled	JP12	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(4) 256K x 9	NONE	NONE	NONE
1MB	NONE	NONE	(4) 256K x 9	NONE
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE
2MB	NONE	NONE	(4) 256K x 9	(4) 256K x 9
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE	NONE	NONE
4MB	NONE	NONE	(4) 1M x 9	NONE
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
8MB	NONE	NONE	(4) 1M x 9	(4) 1M x 9
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
Notes:Banks 2 & 3 are used when an external proprietary memory card is installed.

DRAM JUMPER CONFIGURATION
Size	JP7	JP8	JP9	JP10	JP11
1MB	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
1MB	1 & 2	2 & 3	2 & 3	2 & 3	2 & 3
2MB	1 & 2	1 & 2	1 & 2	1 & 2	1 & 2
2MB	1 & 2	2 & 3	2 & 3	2 & 3	2 & 3
4MB	1 & 2	2 & 3	2 & 3	2 & 3	2 & 3
4MB	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2
4MB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
8MB	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2
8MB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
16MB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Notes:Pins designated should be in the closed position.