286/12 Motherboard Settings and Configuration

Processor	80286
Processor Speed	12/16/20MHz
Chip Set	C & T
Max. Onboard DRAM	1MB
Cache	None
BIOS	Phoenix
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo switch	J1	Power LED & keylock	J6
External battery	J3	Reset switch	J15
Speaker	J5	Turbo LED	J16

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	CPU speed select 12MHz	J1	pins 1 & 2 closed
	CPU speed select 8MHz	J1	pins 2 & 3 closed
»	CPU Speed select switchable at turbo switch	J2	pins 1 & 2 closed
	CPU Speed select switchable at keyboard	J2	pins 2 & 3 closed
»	DMA clock speed select iOSC/2	J4	pins 2 & 3 closed
	DMA clock speed select iOSC/1	J4	pins 1 & 2 closed
»	DRAM access speed select 8MHz	J10	pins 1 & 2 closed
	DRAM access speed select 12MHz	J10	pins 2 & 3 closed
»	BIOS access speed select 8MHz	J11	pins 2 & 3 closed
	BIOS access speed select 12MHz	J11	pins 1 & 2 closed
»	DMA clock slow down enabled	J12	pins 1 & 2 closed
	DMA clock slow down disabled	J12	pins 2 & 3 closed
»	Keyboard controller speed select 8MHz	J13	pins 1 & 2 closed
	Keyboard controller speed select 4MHz	J13	pins 2 & 3 closed
»	NPU speed select 8MHz	J14	pins 2 & 3 closed
	NPU speed select 4.77MHz	J14	pins 1 & 2 closed
»	Battery type select internal	J17	Closed
	Battery type select external	J17	Open
»	Battery charge mode select normal	J18	Open
	Battery charge mode select fast	J18	Closed
»	Monitor type select color	S1/3	On
	Monitor type select monochrome	S1/3	Off

DRAM CONFIGURATION
Size	Bank 0	Bank 1
256KB	(18) 4164	(18) 4164
512KB	(18) 41256	NONE
640KB	(18) 41256	(18) 4164
1MB	(18) 41256	(18) 41256

DRAM SWITCH CONFIGURATION
Size	S1/1	S1/2	S1/4
256KB	On	On	Off
512KB	Off	On	Off
640KB	On	Off	Off
1MB (512KB base)	Off	Off	Off
1MB (640KB base)	Off	Off	On