80386SX VLSI Motherboard Settings and Configuration

Device Type	Mainboard
Processor	80386SX
Processor Speed	16MHz
Chip Set	VLSI
Video Chip Set	None
Maximum Onboard Memory	4MB
Maximum Video Memory	None
Cache	None
BIOS	AMI, Award, Phoenix
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	JP2	Speaker	JP5
Reset switch	JP3	Turbo switch	JP6
Turbo LED	JP4	External battery	JP22

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	BIOS type select 27256	JP1	Pins 1 & 2 closed
	BIOS type select 27128	JP1	Pins 2 & 3 closed
»	Factory configured - do not alter (shadow RAM)	JP14	Open
»	Power good signal detect from power supply	JP24	Pins 1 & 2 closed
	Power good signal detect from board	JP24	Pins 2 & 3 closed
	Monitor type select CGA/EGA/VGA	JP25	Pins 1 & 2 closed
	Monitor type select monochrome	JP25	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 0A
512KB	None	None	(4) 44256
640KB	None	None	(4) 44256
1MB	None	None	(4) 44256
2MB	(18) 41100	None	None
4MB	(18) 41100	(18) 41100	None

DRAM CONFIGURATION (CON’T)
Size	Bank 1A	Bank 1B	P 0	P 1
512KB	None	None	(2) 41256	None
640KB	(4) 4464	None	(2) 41256	(2) 4164
1MB	None	(4) 44256	(2) 41256	(2) 41256
2MB	None	None	None	None
4MB	None	None	None	None

DRAM JUMPER CONFIGURATION
Size	JP15	JP16	JP23
512KB	Closed	Open	Closed
640KB	Open	Closed	Closed
1MB	Open	Closed	Closed
2MB	Closed	Open	Open
4MB	Open	Closed	Open

DRAM WAIT STATE SELECTION
Wait state	JP10	JP11
0	Closed	Closed
1	Open	Open

KEYBOARD PIN CONTROLLER SELECTION
Pin	JP17	JP18	JP19	JP20
23	Closed	Open	Open	Open
27	Open	Closed	Open	Open
30	Open	Open	Closed	Open
32	Open	Open	Open	Closed