IT286SB Motherboard Settings and Configuration

Processor	80286
Processor Speed	5/6/8/10MHz
Chip Set	C & T
Max. Onboard DRAM	1MB
SRAM Cache	None
BIOS	Unknown
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J13	External battery	J18
Power LED & keylock	J16	Turbo LED	J20
Reset switch	J17

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Power good signal detect from power supply	J23	pins 1 & 2 closed
	Power good signal detect from board	J23	pins 2 & 3 closed
»	CPU speed software selectable	SW1	pins 2 & 3 closed
	CPU speed select 5.33/6.7MHz	SW1	pins 1 & 2 closed
	CPU speed select 8/10MHz	SW1	open
»	Monitor type select monochrome	SW2	pins 2 & 3 closed
	Monitor type select color	SW2	pins 1 & 2 closed

DRAM CONFIGURATION
Size		Bank 0	Bank 1	Jumper W4	Jumper W5
	256KB	(18) 4164	(18) 4164	pins 1 & 2 closed	pins 1 & 2 closed
	512KB	(18) 41256	NONE	pins 2 & 3 closed	pins 1 & 2 closed
»	640KB	(18) 41256	(18) 4164	pins 1 & 2 closed	pins 2 & 3 closed
	1024KB	(18) 41256	(18) 41256	pins 2 & 3 closed	pins 2 & 3 closed

NPU CLOCK RATE CONFIGUARATION
NPU	Clock Rate	Jumper W7	Jumper W8
80287-6	3.6/5.33MHz	closed	pins 1 & 2 closed
80287-6	4.46MHz	closed	pins 1 & 2 closed
80287-8	5.33/8MHz	open	pins 2 & 3 closed
80287-8	4.46/6.67MHz	closed	pins 1 & 2 closed
80287-10	6.67/10MHz	open	pins 2 & 3 closed

BIOS TYPE CONFIGURATION
BIOS		Size	Jumper W2	Jumper W3
»	27128	32K EPROM	pins 2 & 3 closed	pins 1 & 2 closed
	27256	64K EPROM	pins 1 & 2 closed	pins 1 & 2 closed
	23128	32K MASK ROM	pins 2 & 3 closed	pins 2 & 3 closed
	23256	64K MASK ROM	pins 1 & 2 closed	pins 2 & 3 closed

BATTERY TYPE CONFIGUARATION
Battery		J21	J22
»	Internal lithium (2 x 3VDC)	pins 1 & 2 closed	open
	External lithium (6VDC)	open	closed
	External alkaline (6VDC)	open	open