80386 SX Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	16/20MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	4MB
Maximum Video Memory	None
Cache	None
BIOS	AMI
Dimensions	330mm x 217mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo LED	JP1	Turbo switch	JP4
Speaker	JP2	Power LED & keylock	JP5
Reset switch	JP3	External battery	JP15
Note: JP4 may be a 2-pin jumper.

USER CONFIGURABLE SETTINGS
Function		Label	Position
	ROM wait state select 2 wait states (16MHz CPU)	J1	Pins 2 & 3 closed
	ROM wait state select 3 wait states (20MHz CPU)	J1	Pins 1 & 2 closed
	Turbo enabled	JP4	Pins 2 & 3 closed
	Turbo disabled	JP4	Pins 1 & 2 closed
	NPU not installed	JP6	Pins 2 & 3 closed
	NPU installed	JP6	Pins 1 & 2 closed
	Parity disabled	JP7	Open
	Parity enabled	JP7	Closed
	RAM wait state select 0 wait states (only if JP9 is open)	JP8	Pins 1 & 2 closed
	RAM wait state select 1 wait state (only if JP9 is open)	JP8	Pins 2 & 3 closed
	JP8 enabled	JP9	Open
	8042 keyboard controller pin 29	JP9	Closed
»	Factory configured - do not alter (for AMI BIOS & 8042)	JP10	Open
	Monitor type select color	JP11	Pins 2 & 3 closed
	Monitor type select monochrome	JP11	Pins 1 & 2 closed
	Power good signal detect from power supply	JP13	Pins 2 & 3 closed
	Power good signal detect from board	JP13	Pins 1 & 2 closed
	12v battery charge disabled	JP14	Pins 1 & 2 closed
	12v battery charge enabled	JP14	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
512KB	(18) 41256	None
640KB	(18) 41256	(18) 4164
1MB	(18) 41256	(18) 41256
2MB	(18) 411000	None
4MB	(18) 411000	(18) 411000

DRAM JUMPER CONFIGURATION
Size	J3
512KB	Pins 1 & 2, 3 & 4 closed
640KB	Pins 2 & 4, 3 & 5 closed
1MB	Pins 3 & 5, 4 & 6 closed
2MB	Pins 1 & 3, 4 & 6 closed
4MB	Pins 1 & 3, 4 & 6 closed

CPU SPEED SELECTION
Speed	J2
16MHz	Pins 3 & 4, 7 & 8 closed
20MHz	Pins 3 & 4, 5 & 6 closed