T386-25 Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	25MHz
Chip Set	ACT
Max. Onboard DRAM	16MB
Cache	None
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387/3167

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo LED	JP3	External battery	JP13
Power LED & Keylock	JP7	Speaker	JP16
Reset switch	JP12	Turbo switch	JP17

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	BIOS type select 27512	JP6	pins 1 & 2 closed
	BIOS type select 27256	JP6	pins 2 & 3 closed
»	Monitor type select color	JP8	pins 2 & 3 closed
	Monitor type select monochrome	JP8	pins 1 & 2 closed
»	Battery select internal	JP14	pins 2 & 3 closed
	Battery select external	JP14	pins 1 & 2 closed
»	Power good signal detect from power supply	JP15	pins 1 & 2 closed
	Power good signal detect from board	JP15	pins 2 & 3 closed
»	Refresh timing select normal	JP18	pins 1 & 2 closed
	Refresh timing select fast	JP18	pins 2 & 3 closed
»	Parity check enabled	JP19	pins 1 & 2 closed
	Parity check disabled	JP19	pins 2 & 3 closed
»	Page mode select normal 1, 2 wait state	JP20	pins 1 & 2 closed
	Page mode select page interleave	JP20	pins 2 & 3 closed
»	SIMM wait state select 2 wait states (non-page mode)	JP21	pins 2 & 3 closed
	SIMM wait state select 1 wait state (non-page mode)	JP21	pins 1 & 2 closed
»	DIP RAM wait state select 2 wait states (non-page mode)	JP22	pins 2 & 3 closed
	DIP RAM wait state select 1 wait state (non-page mode)	JP22	pins 1 & 2 closed
»	Interleave factor banks 0-3 four way interleave disabled	SW1/3	Off
	Interleave factor banks 0-3 four way interleave enabled	SW1/3	On
»	Interleave factor banks 2 and 3 interleave disabled	SW1/4	Off
	Interleave factor banks 2 and 3 two way interleave enabled	SW1/4	On
»	Interleave factor banks 0 and 1 interleave disabled	SW1/5	Off
	Interleave factor banks 0 and 1 two way interleave enabled	SW1/5	On
Note:SW1/switch 5 should be open if 1MB is installed, if memory is greater it should be closed. SW1/switch 4 should be closed if 10MB is installed. SW1/switch 3 should be closed if 4MB is installed. JP20 pins 1 & 2 must be closed if 4M x 9 SIMMs are used.

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3	P-0	P-1
1MB	(8) 44256	NONE	NONE	NONE	(4) 41256	NONE
2MB	(8) 44256	(8) 44256	NONE	NONE	(4) 41256	(4) 41256
3MB	(8) 44256	(8) 44256	(4) 256K x 9	NONE	(4) 41256	(4) 41256
4MB	(8) 44256	(8) 44256	(4) 256K x 9	(4) 256K x 9	(4) 41256	(4) 41256
6MB	(8) 44256	(8) 44256	(4) 1M x 9	NONE	(4) 41256	(4) 41256
10MB	(8) 44256	(8) 44256	(4) 1M x 9	(4) 1M x 9	(4) 41256	(4) 41256
16MB	NONE	NONE	(4) 4M x 9	(4) 4M x 9	NONE	NONE

DRAM JUMPER/SWITCH CONFIGURATION
Size	SW1/6	SW1/7	SW1/8	JP23
1MB	Off	Off	Off	pins 2 & 3 closed
2MB	Off	Off	On	pins 2 & 3 closed
3MB	Off	On	Off	pins 2 & 3 closed
4MB	Off	On	On	pins 2 & 3 closed
6MB	On	On	Off	pins 2 & 3 closed
10MB	On	On	On	pins 2 & 3 closed
16MB	Off	Off	Off	pins 1 & 2 closed

DRAM REFRESH RATE CONFIGURATION
Size	SW1/1	SW1/2
Refreshes per hold cycle select 1	Off	Off
Refreshes per hold cycle select 2	Off	On
Refreshes per hold cycle select 4	On	Off
Refreshes per hold cycle select 8	On	On

NPU TYPE CONFIGURATION
Type	JP2	JP4
80387	pins 1 & 2 closed	pins 2 & 3 closed
3167	pins 2 & 3 closed	pins 1 & 2 closed