MB386SX Motherboard Settings and Configuration

Processor	80386SX
Processor Speed	16/20/25MHz
Chip Set	VLSI
Max. Onboard DRAM	4MB
Cache	None
BIOS	AMI
Dimensions	220mm x 220mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	JP20	Turbo switch	JP52
Power LED & keylock	JP30	Turbo LED	JP56
Reset switch	JP51

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Pipeline mode enabled	JP10	closed
	Pipeline mode disabled	JP10	open
»	BIOS type select 27256	JP23 JP24	open closed
	BIOS type select 27128	JP23 JP24	open open
	BIOS type select 27512	JP23 JP24	closed closed
»	Parity check enabled	JP25	closed
	Parity check disabled	JP25	open
»	Monitor type select color	JP31	closed
	Monitor type select monochrome	JP31	open
»	Power good signal detect from board	JP55	pins 1 & 2 closed
	Power good signal detect from power supply	JP55	pins 2 & 3 closed
»	CMOS memory normal operation	JP58	pins 1 & 2 closed
	CMOS memory clear	JP58	pins 3 & 4 closed
»	Factory configured - do not alter	JP59	N/A

DRAM CONFIGURATION
Size	Bank 0	Parity (P-0)	Bank 1	Parity (P-1)	Bank 2	Bank 3
512KB	(4) 44256	(2) 41256	NONE	NONE	NONE	NONE
1MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	NONE	NONE
1.5MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 256K x 9	NONE
2MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 256K x 9	(2) 256K x 9
2MB	NONE	NONE	NONE	NONE	(2) 1M x 9	NONE
3MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 1M x 9	NONE
4MB	NONE	NONE	NONE	NONE	(2) 1M x 9	(2) 1M x 9