486-GT Motherboard Settings and Configuration

FIRST INTERNATIONAL COMPUTER, INC.

486-GT

Processor
CX486S/CX487S/80486SL/80486SX/CX486DX/80486DX/ODP486SX/ 80486DX2/Pentium Overdrive
Processor Speed
25/33/40/50(internal)/50/66(internal)MHz
Chip Set
VIA
Max. Onboard DRAM
96MB
Cache
64/128/256KB
BIOS
Award
Dimensions
330mm x 218mm
I/O Options
None
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J1
Reset switch
J8
Turbo switch
J2
Speaker
J9
Green Power supply connector
J3
Power LED & keylock
J10
Turbo LED
J6

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Monitor type select monochrome, EGA or VGA
J4
Open

Monitor type select color
J4
Closed
»
Adaptec ISA master installed
J5
Closed

Adaptec ISA master not installed
J5
Open
»
CMOS memory normal operation
J7
Open

CMOS memory clear
J7
Closed
»
Cyrix clock 2 x mode
JC8
pins 1 & 2 closed

Cyrix clock 1 x mode
JC8
pins 2 & 3 closed
»
Factory configured - do not alter
JP1
pins 1 & 2 closed
»
Factory configured - do not alter
JP3
pins 1 & 2 closed
»
Pentium Overdrive write-back CPU installed
JT1
pins 1 & 2 closed

Pentium Overdrive write-through CPU installed
JT1
pins 2 & 3 closed
»
Factory configured - do not alter
JX1
pins 1 & 2 closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
1MB
(4) 256K x 9
NONE
NONE
1MB
NONE
(1) 1M x 36
NONE
1MB
NONE
NONE
(1) 1M x 36
2MB
(4) 256K x 9
(1) 1M x 36
NONE
2MB
NONE
(1) 1M x 36
(1) 1M x 36
2MB
(4) 256K x 9
NONE
(1) 1M x 36
3MB
(4) 256K x 9
(1) 1M x 36
(1) 1M x 36
4MB
(4) 1M x 9
NONE
NONE
4MB
NONE
(1) 4M x 36
NONE
4MB
NONE
NONE
(1) 4M x 36
5MB
(4) 256K x 9
(1) 4M x 36
NONE
5MB
(4) 256K x 9
NONE
(1) 4M x 36
5MB
(4) 1M x 9
(1) 1M x 36
NONE
5MB
(1) 1M x 9
NONE
(1) 1M x 36
5MB
NONE
(1) 1M x 36
(1) 4M x 36
5MB
NONE
(1) 4M x 36
(1) 1M x 36
6MB
(4) 256K x 9
(1) 4M x 36
(1) 1M x 36
6MB
(4) 256K x 9
(1) 1M x 36
(1) 4M x 36
6MB
(1) 1M x 9
(1) 1M x 36
(1) 1M x 36
8MB
(1) 1M x 9
(1) 4M x 36
NONE
8MB
(1) 1M x 9
NONE
(1) 4M x 36
8MB
NONE
(1) 4M x 36
(1) 4M x 36
9MB
(4) 256K x 9
(1) 4M x 36
(1) 4M x 36
9MB
(1) 1M x 9
(1) 1M x 36
(1) 4M x 36
9MB
(1) 1M x 9
(1) 4M x 36
(1) 1M x 36
12MB
(1) 1M x 9
(1) 4M x 36
(1) 4M x 36
16MB
(1) 4M x 9
NONE
NONE
16MB
NONE
(1) 16M x 36
NONE
16MB
NONE
NONE
(1) 16M x 36

DRAM CONFIGURATION (CONT.)
Size
Bank 0
Bank 1
Bank 2
17MB
(4) 256K x 9
(1) 16M x 36
NONE
17MB
(4) 256K x 9
NONE
(1) 16M x 36
17MB
NONE
(1) 1M x 36
(1) 16M x 36
17MB
NONE
(1) 16M x 36
(1) 1M x 36
17MB
(1) 4M x 9
(1) 1M x 36
NONE
17MB
(1) 4M x 9
NONE
(1) 1M x 36
18MB
(4) 256K x 9
(1) 1M x 36
(1) 16M x 36
18MB
(4) 256K x 9
(1) 16M x 36
(1) 1M x 36
18MB
(1) 4M x 9
(1) 1M x 36
(1) 1M x 36
20MB
(1) 1M x 9
(1) 16M x 36
NONE
20MB
(1) 1M x 9
NONE
(1) 16M x 36
20MB
(1) 4M x 9
(1) 4M x 36
NONE
20MB
(1) 4M x 9
NONE
(1) 4M x 36
20MB
NONE
(1) 4M x 36
(1) 16M x 36
20MB
NONE
(1) 16M x 36
(1) 4M x 36
21MB
(4) 256K x 9
(1) 4M x 36
(1) 16M x 36
21MB
(4) 256K x 9
(1) 16M x 36
(1) 4M x 36
21MB
(1) 1M x 9
(1) 1M x 36
(1) 16M x 36
21MB
(1) 1M x 9
(1) 16M x 36
(1) 1M x 36
21MB
(1) 4M x 9
(1) 1M x 36
(1) 4M x 36
21MB
(1) 4M x 9
(1) 4M x 36
(1) 1M x 36
24MB
(1) 1M x 9
(1) 4M x 36
(1) 16M x 36
24MB
(1) 1M x 9
(1) 16M x 36
(1) 4M x 36
24MB
(1) 4M x 9
(1) 4M x 36
(1) 4M x 36
32MB
(1) 4M x 9
(1) 16M x 36
NONE
32MB
(1) 4M x 9
NONE
(1) 16M x 36
32MB
NONE
(1) 16M x 36
(1) 16M x 36
32MB
NONE
(1) 32M x 36
NONE
32MB
NONE
NONE
(1) 32M x 36
33MB
(4) 256K x 9
(1) 16M x 36
(1) 16M x 36
33MB
(1) 4M x 9
(1) 1M x 36
(1) 16M x 36
33MB
(1) 4M x 9
(1) 16M x 36
(1) 1M x 36
36MB
(1) 1M x 9
(1) 16M x 36
(1) 16M x 36
36MB
(1) 4M x 9
(1) 4M x 36
(1) 16M x 36
36MB
(1) 4M x 9
(1) 16M x 36
(1) 4M x 36
48MB
(1) 4M x 9
(1) 16M x 36
(1) 16M x 36
64MB
(1) 16M x 9
NONE
NONE
64MB
NONE
(1) 32M x 36
(1) 32M x 36
65MB
(1) 16M x 9
(1) 1M x 36
NONE
65MB
(1) 16M x 9
NONE
(1) 1M x 36
66MB
(1) 16M x 9
(1) 1M x 36
(1) 1M x 36
68MB
(1) 16M x 9
(1) 4M x 36
NONE
68MB
(1) 16M x 9
NONE
(1) 4M x 36
69MB
(1) 16M x 9
(1) 1M x 36
(1) 4M x 36
69MB
(1) 16M x 9
(1) 4M x 36
(1) 1M x 36

DRAM CONFIGURATION (CONT.)
Size
Bank 0
Bank 1
Bank 2
72MB
(1) 16M x 9
(1) 4M x 36
(1) 4M x 36
80MB
(1) 16M x 9
(1) 16M x 36
NONE
80MB
(1) 16M x 9
NONE
(1) 16M x 36
81MB
(1) 16M x 9
(1) 1M x 36
(1) 16M x 36
81MB
(1) 16M x 9
(1) 16M x 36
(1) 1M x 36
84MB
(1) 16M x 9
(1) 4M x 36
(1) 16M x 36
84MB
(1) 16M x 9
(1) 16M x 36
(1) 4M x 36
96MB
(1) 16M x 9
(1) 16M x 36
(1) 16M x 36

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
64KB
(4) 8K x 8
(4) 8K x 8
(1) 8K x 8
128KB
(4) 32K x 8
NONE
(1) 8K x 8
256KB
(4) 32K x 8
(4) 32K x 8
(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size
JS1
JS2
JS3
64KB
pins 1 & 2 closed
pins 1 & 2 closed
pins 1 & 2 closed
128KB
pins 1 & 2 closed
pins 2 & 3 closed
pins 2 & 3 closed
256KB
pins 2 & 3 closed
pins 2 & 3 closed
pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type
JC1
JC2
JC3
JC4
JC5
JC7
JCX1
CX486S
2 & 3
2 & 3
Closed
Open
Open
1 & 2
Open
CX486S/CX487S
1 & 2
1 & 2
Closed
Open
Open
1 & 2
Closed
CX487S
1 & 2
1 & 2
Closed
Open
Open
1 & 2
Closed
80486SL
1 & 2
1 & 2
Closed
Open
Closed
1 & 2
Open
80486SX
2 & 3
2 & 3
Open
Open
Closed
1 & 2
Open
CX486DX
1 & 2
1 & 2
Closed
Open
Open
1 & 2
Closed
80486DX
1 & 2
1 & 2
Closed
Open
Closed
1 & 2
Open
ODP486SX
1 & 2
1 & 2
Closed
Open
Closed
1 & 2
Open
80486DX2
1 & 2
1 & 2
Closed
Open
Closed
1 & 2
Open
Pentium Overdrive
1 & 2
1 & 2
Open
Closed
Open
2 & 3
Open
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CONT.)
Type
JCX2
JP2
JX2
RN12
RN13
CX486S
pins 2 & 3
pins 2 & 3
pins 2 & 3
Not installed
Installed
80486SL
pins 1 & 2
pins 2 & 3
pins 2 & 3
Installed
Not installed
80486SX
pins 1 & 2
pins 2 & 3
pins 2 & 3
Not installed
Not installed
CX486DX
pins 1 & 2
pins 2 & 3
pins 2 & 3
Not installed
Installed
80486DX
pins 1 & 2
pins 1 & 2
pins 1 & 2
Not installed
Not installed
ODP486SX
pins 1 & 2
pins 2 & 3
pins 2 & 3
Installed
Not installed
80486DX2
pins 1 & 2
pins 1 & 2
pins 1 & 2
Not installed
Not installed
Pentium Overdrive
pins 1 & 2
pins 1 & 2
pins 1 & 2
Installed
Not installed
Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed
JK1
JK2
JK3
JK4
25MHz
pins 2 & 3 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 1 & 2 closed
33MHz
pins 2 & 3 closed
pins 2 & 3 closed
pins 1 & 2 closed
pins 1 & 2 closed
40MHz
pins 1 & 2 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 1 & 2 closed
50iMHz
pins 2 & 3 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 1 & 2 closed
50MHz
pins 2 & 3 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 2 & 3 closed
66iMHz
pins 2 & 3 closed
pins 2 & 3 closed
pins 1 & 2 closed
pins 1 & 2 closed

KEYBOARD CONTROL SELECT
Keyboard
JX3
RN1
RN2
Internal
pins 2 & 3 closed
Not installed
Installed
External
pins 1 & 2 closed
Installed
Not installed

MISCELLANEOUS TECHNICAL NOTES
When U15 is installed JP5 and JP6 should be set to pins 2 & 3 closed.
When U15 is not installed, JP5 and JP6 should be set to pins 1 & 2 closed.
The exact location for U15 is unknown.
The exact function of X2 is unknown.

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Processor	CX486S/CX487S/80486SL/80486SX/CX486DX/80486DX/ODP486SX/ 80486DX2/Pentium Overdrive
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	VIA
Max. Onboard DRAM	96MB
Cache	64/128/256KB
BIOS	Award
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Reset switch	J8
Turbo switch	J2	Speaker	J9
Green Power supply connector	J3	Power LED & keylock	J10
Turbo LED	J6

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome, EGA or VGA	J4	Open
	Monitor type select color	J4	Closed
»	Adaptec ISA master installed	J5	Closed
	Adaptec ISA master not installed	J5	Open
»	CMOS memory normal operation	J7	Open
	CMOS memory clear	J7	Closed
»	Cyrix clock 2 x mode	JC8	pins 1 & 2 closed
	Cyrix clock 1 x mode	JC8	pins 2 & 3 closed
»	Factory configured - do not alter	JP1	pins 1 & 2 closed
»	Factory configured - do not alter	JP3	pins 1 & 2 closed
»	Pentium Overdrive write-back CPU installed	JT1	pins 1 & 2 closed
	Pentium Overdrive write-through CPU installed	JT1	pins 2 & 3 closed
»	Factory configured - do not alter	JX1	pins 1 & 2 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
1MB	(4) 256K x 9	NONE	NONE
1MB	NONE	(1) 1M x 36	NONE
1MB	NONE	NONE	(1) 1M x 36
2MB	(4) 256K x 9	(1) 1M x 36	NONE
2MB	NONE	(1) 1M x 36	(1) 1M x 36
2MB	(4) 256K x 9	NONE	(1) 1M x 36
3MB	(4) 256K x 9	(1) 1M x 36	(1) 1M x 36
4MB	(4) 1M x 9	NONE	NONE
4MB	NONE	(1) 4M x 36	NONE
4MB	NONE	NONE	(1) 4M x 36
5MB	(4) 256K x 9	(1) 4M x 36	NONE
5MB	(4) 256K x 9	NONE	(1) 4M x 36
5MB	(4) 1M x 9	(1) 1M x 36	NONE
5MB	(1) 1M x 9	NONE	(1) 1M x 36
5MB	NONE	(1) 1M x 36	(1) 4M x 36
5MB	NONE	(1) 4M x 36	(1) 1M x 36
6MB	(4) 256K x 9	(1) 4M x 36	(1) 1M x 36
6MB	(4) 256K x 9	(1) 1M x 36	(1) 4M x 36
6MB	(1) 1M x 9	(1) 1M x 36	(1) 1M x 36
8MB	(1) 1M x 9	(1) 4M x 36	NONE
8MB	(1) 1M x 9	NONE	(1) 4M x 36
8MB	NONE	(1) 4M x 36	(1) 4M x 36
9MB	(4) 256K x 9	(1) 4M x 36	(1) 4M x 36
9MB	(1) 1M x 9	(1) 1M x 36	(1) 4M x 36
9MB	(1) 1M x 9	(1) 4M x 36	(1) 1M x 36
12MB	(1) 1M x 9	(1) 4M x 36	(1) 4M x 36
16MB	(1) 4M x 9	NONE	NONE
16MB	NONE	(1) 16M x 36	NONE
16MB	NONE	NONE	(1) 16M x 36

DRAM CONFIGURATION (CONT.)
Size	Bank 0	Bank 1	Bank 2
17MB	(4) 256K x 9	(1) 16M x 36	NONE
17MB	(4) 256K x 9	NONE	(1) 16M x 36
17MB	NONE	(1) 1M x 36	(1) 16M x 36
17MB	NONE	(1) 16M x 36	(1) 1M x 36
17MB	(1) 4M x 9	(1) 1M x 36	NONE
17MB	(1) 4M x 9	NONE	(1) 1M x 36
18MB	(4) 256K x 9	(1) 1M x 36	(1) 16M x 36
18MB	(4) 256K x 9	(1) 16M x 36	(1) 1M x 36
18MB	(1) 4M x 9	(1) 1M x 36	(1) 1M x 36
20MB	(1) 1M x 9	(1) 16M x 36	NONE
20MB	(1) 1M x 9	NONE	(1) 16M x 36
20MB	(1) 4M x 9	(1) 4M x 36	NONE
20MB	(1) 4M x 9	NONE	(1) 4M x 36
20MB	NONE	(1) 4M x 36	(1) 16M x 36
20MB	NONE	(1) 16M x 36	(1) 4M x 36
21MB	(4) 256K x 9	(1) 4M x 36	(1) 16M x 36
21MB	(4) 256K x 9	(1) 16M x 36	(1) 4M x 36
21MB	(1) 1M x 9	(1) 1M x 36	(1) 16M x 36
21MB	(1) 1M x 9	(1) 16M x 36	(1) 1M x 36
21MB	(1) 4M x 9	(1) 1M x 36	(1) 4M x 36
21MB	(1) 4M x 9	(1) 4M x 36	(1) 1M x 36
24MB	(1) 1M x 9	(1) 4M x 36	(1) 16M x 36
24MB	(1) 1M x 9	(1) 16M x 36	(1) 4M x 36
24MB	(1) 4M x 9	(1) 4M x 36	(1) 4M x 36
32MB	(1) 4M x 9	(1) 16M x 36	NONE
32MB	(1) 4M x 9	NONE	(1) 16M x 36
32MB	NONE	(1) 16M x 36	(1) 16M x 36
32MB	NONE	(1) 32M x 36	NONE
32MB	NONE	NONE	(1) 32M x 36
33MB	(4) 256K x 9	(1) 16M x 36	(1) 16M x 36
33MB	(1) 4M x 9	(1) 1M x 36	(1) 16M x 36
33MB	(1) 4M x 9	(1) 16M x 36	(1) 1M x 36
36MB	(1) 1M x 9	(1) 16M x 36	(1) 16M x 36
36MB	(1) 4M x 9	(1) 4M x 36	(1) 16M x 36
36MB	(1) 4M x 9	(1) 16M x 36	(1) 4M x 36
48MB	(1) 4M x 9	(1) 16M x 36	(1) 16M x 36
64MB	(1) 16M x 9	NONE	NONE
64MB	NONE	(1) 32M x 36	(1) 32M x 36
65MB	(1) 16M x 9	(1) 1M x 36	NONE
65MB	(1) 16M x 9	NONE	(1) 1M x 36
66MB	(1) 16M x 9	(1) 1M x 36	(1) 1M x 36
68MB	(1) 16M x 9	(1) 4M x 36	NONE
68MB	(1) 16M x 9	NONE	(1) 4M x 36
69MB	(1) 16M x 9	(1) 1M x 36	(1) 4M x 36
69MB	(1) 16M x 9	(1) 4M x 36	(1) 1M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8
128KB	(4) 32K x 8	NONE	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JS1	JS2	JS3
64KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
128KB	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
256KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	JC1	JC2	JC3	JC4	JC5	JC7	JCX1
CX486S	2 & 3	2 & 3	Closed	Open	Open	1 & 2	Open
CX486S/CX487S	1 & 2	1 & 2	Closed	Open	Open	1 & 2	Closed
CX487S	1 & 2	1 & 2	Closed	Open	Open	1 & 2	Closed
80486SL	1 & 2	1 & 2	Closed	Open	Closed	1 & 2	Open
80486SX	2 & 3	2 & 3	Open	Open	Closed	1 & 2	Open
CX486DX	1 & 2	1 & 2	Closed	Open	Open	1 & 2	Closed
80486DX	1 & 2	1 & 2	Closed	Open	Closed	1 & 2	Open
ODP486SX	1 & 2	1 & 2	Closed	Open	Closed	1 & 2	Open
80486DX2	1 & 2	1 & 2	Closed	Open	Closed	1 & 2	Open
Pentium Overdrive	1 & 2	1 & 2	Open	Closed	Open	2 & 3	Open
Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CONT.)
Type	JCX2	JP2	JX2	RN12	RN13
CX486S	pins 2 & 3	pins 2 & 3	pins 2 & 3	Not installed	Installed
80486SL	pins 1 & 2	pins 2 & 3	pins 2 & 3	Installed	Not installed
80486SX	pins 1 & 2	pins 2 & 3	pins 2 & 3	Not installed	Not installed
CX486DX	pins 1 & 2	pins 2 & 3	pins 2 & 3	Not installed	Installed
80486DX	pins 1 & 2	pins 1 & 2	pins 1 & 2	Not installed	Not installed
ODP486SX	pins 1 & 2	pins 2 & 3	pins 2 & 3	Installed	Not installed
80486DX2	pins 1 & 2	pins 1 & 2	pins 1 & 2	Not installed	Not installed
Pentium Overdrive	pins 1 & 2	pins 1 & 2	pins 1 & 2	Installed	Not installed
Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	JK1	JK2	JK3	JK4
25MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
33MHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed
40MHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
50iMHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
50MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
66iMHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed

KEYBOARD CONTROL SELECT
Keyboard	JX3	RN1	RN2
Internal	pins 2 & 3 closed	Not installed	Installed
External	pins 1 & 2 closed	Installed	Not installed