486 LOCAL BUS MAINBOARD Motherboard Settings and Configuration

ATEN RESEARCH, INC.

486 LOCAL BUS MAINBOARD

Processor
80486SX/80486DX/80486DX2
Processor Speed
20/25/33/50(internal)/50/66(internal)MHz
Chip Set
OPTI
Max. Onboard DRAM
64MB
Cache
64/256KB
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
32-bit local bus card slot
NPU Options
4167

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J2 pins 1 & 4
Speaker
J6
Turbo switch
J3
Power LED & keylock
J7
Reset switch
J4
32-bit local bus card
S1
Turbo LED
J5

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Battery type select internal
J2
pins 2 & 3 closed

Battery type select external
J2
pins 1 & 4 connected
»
Monitor type select color
JP1
closed

Monitor type select monochrome
JP1
open
»
CMOS memory normal operation
JP2
pins 1 & 2 closed

CMOS memory clear
JP2
pins 2 & 3 closed
»
VGA card type select ISA
JP3
JP4
pins 1 & 2 closed
pins 1 & 2 closed

VGA card type select local bus with ET 4000 chipset
JP3
JP4
pins 2 & 3 closed
pins 2 & 3 closed

VGA card type select local bus with S3 chipset
JP3
JP4
pins 2 & 3 closed
pins 1 & 2 closed
»
I/O Bus speed select ATCLK/4
JP5
open

I/O Bus speed select ATCLK/6
JP5
closed
»
CPU speed select iOSC/2
JP9
pins 2 & 3 closed

CPU speed select iOSC/1
JP9
pins 1 & 2 closed

CPU CONFIGURATION
CPU Type
JP6
JP7
JP8
80486DX2
pins 1 & 2 closed
pins 2 & 3 closed
closed
80486DX
pins 1 & 2 closed
pins 2 & 3 closed
closed
80486SX
pins 2 & 3 closed
open
open

SRAM JUMPER CONFIGURATION
Size
JP10
JP11
JP12
JP13
64KB
open
open
open
open
256KB
closed
closed
open
closed

SRAM CONFIGURATION
Size
Cache SRAM
TAG (U46)
TAG (U47)
64KB
(8) 8K x 8
(1) 64K x 1
(1) 8K x 8
256KB
(8) 32K x 8
(1) 64K x 1
(1) 32K x 8
Note:Locations of U46 and U47 are unknown.

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
3MB
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
NONE
4MB
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
5MB
(4) 1M x 9
(4) 256K x 9
NONE
NONE
6MB
(4) 256K x 9
(4) 256K x 9
(4) 1M x 9
NONE
7MB
(4) 256K x 9
(4) 256K x 9
(4) 256K x 9
(4) 1M x 9
8MB
(4) 1M x 9
(4) 1M x 9
NONE
NONE
9MB
(4) 256K x 9
(4) 1M x 9
(4) 1M x 9
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
13MB
(4) 256K x 9
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
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
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
28MB
(4) 1M x 9
(4) 1M x 9
(4) 1M x 9
(4) 4M x 9
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
52MB
(4) 1M x 9
(4) 4M 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

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486 LOCAL BUS MAINBOARD Motherboard Settings and Configuration

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Processor	80486SX/80486DX/80486DX2
Processor Speed	20/25/33/50(internal)/50/66(internal)MHz
Chip Set	OPTI
Max. Onboard DRAM	64MB
Cache	64/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit local bus card slot
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J2 pins 1 & 4	Speaker	J6
Turbo switch	J3	Power LED & keylock	J7
Reset switch	J4	32-bit local bus card	S1
Turbo LED	J5

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Battery type select internal	J2	pins 2 & 3 closed
	Battery type select external	J2	pins 1 & 4 connected
»	Monitor type select color	JP1	closed
	Monitor type select monochrome	JP1	open
»	CMOS memory normal operation	JP2	pins 1 & 2 closed
	CMOS memory clear	JP2	pins 2 & 3 closed
»	VGA card type select ISA	JP3 JP4	pins 1 & 2 closed pins 1 & 2 closed
	VGA card type select local bus with ET 4000 chipset	JP3 JP4	pins 2 & 3 closed pins 2 & 3 closed
	VGA card type select local bus with S3 chipset	JP3 JP4	pins 2 & 3 closed pins 1 & 2 closed
»	I/O Bus speed select ATCLK/4	JP5	open
	I/O Bus speed select ATCLK/6	JP5	closed
»	CPU speed select iOSC/2	JP9	pins 2 & 3 closed
	CPU speed select iOSC/1	JP9	pins 1 & 2 closed

CPU CONFIGURATION
CPU Type	JP6	JP7	JP8
80486DX2	pins 1 & 2 closed	pins 2 & 3 closed	closed
80486DX	pins 1 & 2 closed	pins 2 & 3 closed	closed
80486SX	pins 2 & 3 closed	open	open

SRAM JUMPER CONFIGURATION
Size	JP10	JP11	JP12	JP13
64KB	open	open	open	open
256KB	closed	closed	open	closed

SRAM CONFIGURATION
Size	Cache SRAM	TAG (U46)	TAG (U47)
64KB	(8) 8K x 8	(1) 64K x 1	(1) 8K x 8
256KB	(8) 32K x 8	(1) 64K x 1	(1) 32K x 8
Note:Locations of U46 and U47 are unknown.

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
3MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	NONE
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9
5MB	(4) 1M x 9	(4) 256K x 9	NONE	NONE
6MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	NONE
7MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE
9MB	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9	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
13MB	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9
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
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
28MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 4M x 9
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
52MB	(4) 1M x 9	(4) 4M 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