STEP 486 EISA VL (EV-3605) Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX
Processor Speed	20/25/33MHZ
Chip Set	C & T
Max. Onboard DRAM	64MB
SRAM Cache	256/512/1024KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slot, keyboard controller/daughter card
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Keyboard controller/daughter card	C1	Turbo LED	JP16
LED front panel connector	CN1	Turbo switch	JP17
Speaker	J19	Reset switch	JP18
Power LED & keylock	J22	32-bit VESA Local bus slot	S1

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Factory configured - do not alter	J1	Closed
»	Factory configured - do not alter	JP9	pins 2 & 3 closed
»	Factory configured - do not alter	JP21	pins 2 & 3 closed
»	Factory configured - do not alter	JP23	Closed
»	Monitor type select color	JP24	Open
	Monitor type select monochrome	JP24	Closed
»	CMOS memory normal operation	JP25	Open
	CMOS memory clear	JP25	Closed
»	Factory configured - do not alter	JP31	Closed
»	Factory configured - do not alter	JP32	Closed
»	Factory configured - do not alter	JP33	Closed
»	Factory configured - do not alter	JP100	pins 2 & 3 closed
»	Factory configured - do not alter	JP101	Closed
»	Factory configured - do not alter	JP102	Closed
»	Factory configured - do not alter	JP103	Closed
»	Factory configured - do not alter	JP104	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(4) 256K x 9	NONE	NONE	NONE
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
4MB	(4) 1M x 9	NONE	NONE	NONE
6MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	NONE
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
12MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	NONE
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE	NONE	NONE
18MB	(4) 256K x 9	(4) 256K x 9	(4) 4M x 9	NONE
20MB	(4) 1M x 9	(4) 4M x 9	NONE	NONE
24MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	NONE
32MB	(4) 4M x 9	(4) 4M x 9	NONE	NONE
36MB	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9	NONE
40MB	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9	(4) 4M x 9
48MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	NONE
64MB	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9	(4) 4M x 9
64MB	(4) 16M x 9	NONE	NONE	NONE
128MB	(4) 16M x 9	(4) 16M x 9	NONE	NONE
192MB	(4) 16M x 9	(4) 16M x 9	(4) 16M x 9	NONE
256MB	(4) 16M x 9	(4) 16M x 9	(4) 16M x 9	(4) 16M x 9

CACHE JUMPER CONFIGURATION
Size	JP1	JP3	JP4	JP12	JP13
256KB	pins 1 & 2	pins 1 & 2	pins 1 & 2	pins 1 & 2	pins 1 & 2
512KB	pins 2 & 3	pins 2 & 3	pins 1 & 2	pins 1 & 2	pins 2 & 3
1024KB	pins 2 & 3	pins 2 & 3	pins 2 & 3	pins 2 & 3	pins 2 & 3
Note:pins designated should be in the closed position.

CACHE CONFIGURATION
Size	Cache	Location	TAG
64KB	(8) 8K x 8	Banks 0 & 1	(2) 16K x 4
128KB	(4) 32K x 8	Bank 0	(2) 16K x 4
256KB	(8) 32K x 8	Banks 0 & 1	(2) 16K x 4

CPU TYPE CONFIGURATION
Type	JP15	JP5	JP7
80486SX	Open	Open	pins 1 & 2 closed
80487SX	Closed	pins 1 & 2 closed	pins 2 & 3 closed
80486DX	Closed	pins 2 & 3 closed	pins 2 & 3 closed