IT486EX VER. 1 Motherboard Settings and Configuration

Processor	80486SX/80486DX
Processor Speed	25/33MHz
Chip Set	Intel
Max. Onboard DRAM	64MB
Cache	64/128KB (with external cache card)
BIOS	Phoenix
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo switch	P1	Reset switch	P4
Turbo LED	P2	Power LED & keylock	P5
Speaker	P3	External battery	P20

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Cache write protect disabled	J5	Closed
	Cache write protect enabled	J5	Open
»	On board DRAM access enabled	J8	Closed
	On board DRAM access disabled	J8	Open
»	I/O recovery time select 8-bit = 11BLCK, 16-bit = 3BLCK	J16	Closed
	No recovery time	J16	Open
»	80486 internal cache enabled	J17	Closed
	80486 internal cache disabled	J17	Open
»	Turbocache486 enabled	J20	Closed
	Turbocache486 disabled	J20	Open
»	BIOS duplicated (to 00FF0000 hex)	J36	Closed
	BIOS not duplicated	J36	Open
»	Turbo mode enabled	P1	Open
	Turbo mode disabled	P1	Closed
»	Factory configured - do not alter	SW1/7	Off
»	Monitor type select monochrome	SW1/8	Off
	Monitor type select color	SW1/8	On

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
10MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9
10MB	(4) 1M x 9	(4) 1M x 9	(4) 256K x 9	(4) 256K x 9
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9	NONE	NONE
34MB	(4) 4M x 9	(4) 4M x 9	(4) 256K x 9	(4) 256K x 9
34MB	(4) 256K x 9	(4) 256K x 9	(4) 4M x 9	(4) 4M x 9
40MB	(4) 4M x 9	(4) 4M x 9	(4) 1M x 9	(4) 1M x 9
40MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9
64MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9

MEMORY BANK CONFIGURATION (BANK 0 & 1)
SIMM Type	SW1/1	SW1/2
No memory installed	Off	Off
256KB	On	Off
1MB	Off	On
4MB	On	On

MEMORY BANK CONFIGURATION (BANK 2 & 3)
SIMM Type	SW1/3	SW1/4
No memory installed	Off	Off
256KB	On	Off
1MB	Off	On
4MB	On	On

MEMORY SPEED/CPU MHZ CONFIGURATION (25MHZ)
SIMM Type	SW1/5	SW1/6
256KB	Off	Off
1MB	On	On
4MB	On	On
Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2 & 3.

MEMORY SPEED/CPU MHZ CONFIGURATION (33MHZ)
SIMM Type	SW1/5	SW1/6
256KB	Off	Off
1MB	On	On
4MB	Off	Off
Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2 & 3.

TURBOCACHE486 CONFIGURATION
Module	J17	J18	J19
82485ES	Open	Open	Open
82485MA/MB	Closed	Closed	Closed

TURBOCACHE486 JUMPER CONFIGURATION
Module	J1	J2	J29	J63
82485ES	Open	Open	Open	Open
82485MA/MB	Closed	Closed	Closed	Closed

CPU SPEED CONFIGURATION
Speed	J3	J15
25MHz	pins 2 & 3 closed	Closed
33MHz	pins 1 & 2 closed	Open

BATTERY TYPE CONFIGURATION
Battery type	J64
4.5V (without internal current limiting resistor)	pins 3 & 4 closed
3.6V-4.5V (with internal current limiting resistor)	pins 1 & 3 closed
6V (without internal current limiting resistor)	pins 2 & 4 closed
6V (with internal current limiting resistor)	pins 1 & 2 closed

BIOS CONTROL CONFIGURATION
ROM type	J25	J35
28F512	Closed	Closed
28F010	Closed	Open
27C512	Open	Closed
27C010	Open	Open