80486SX/DX/DX2 (SYMPHONY) Motherboard Settings and Configuration

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80486SX/DX/DX2 (SYMPHONY)

Processor
80486SX/80486DX/80486DX2
Processor Speed
25/33/50(internal)/50/66(internal)MHz
Chip Set
Symphony
Max. Onboard DRAM
32MB
Cache
64/128/256/1024KB
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
Floppy drive interface, IDE interface, parallel port, serial ports (2)
NPU Options
4167 (not present on all boards)

CONNECTIONS
Purpose
Location
Purpose
Location
IDE interface
CN1
Turbo LED
JP5
Floppy drive interface
CN2
Speaker
JP7
Parallel port
CN3
Power LED & keylock
JP9
Serial port 2
CN4
Reset switch
JP11
Serial port 1
CN5
IDE interface LED
JP12

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
I/O bus speed select CPUCLK=CCLK2
JP2
pins 1 & 2 closed

I/O bus speed select CPUCLK=PCLK
JP2
pins 2 & 3 closed
»
Cache support enabled
JP6
Open

Cache support disabled
JP6
Closed
»
Monitor type select color
JP10
Closed

Monitor type select monochrome
JP10
Open
»
On board I/O enabled
JP18
pins 2 & 3 closed

On board I/O disabled
JP18
pins 1 & 2 closed
»
Parallel port IRQ sleect IRQ7
JP19
pins 2 & 3 closed

Parallel port IRQ sleect IRQ5
JP19
pins 1 & 2 closed
»
Cache controller timing select 1
JP30
pins 1 & 2 closed

Cache controller timing select 2
JP30
pins 2 & 3 closed
»
CPU oscillator matches CPU speed
JP36
Closed

CPU oscillator matches 2x CPU speed
JP36
Open
»
CPU algorithm select 3-2-2-2
JP37
Closed

CPU algorithm select 2-1-1-1
JP37
Open
»
Cache wait state select 0 wait states
JP38
Open

Cache wait state select 1 wait state
JP38
Closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
1MB
(4) 256K x 9
NONE
2MB
(4) 256K x 9
(4) 256K x 9
4MB
(4) 1M x 9
NONE
5MB
(4) 256K x 9
(4) 1M x 9
5MB
(4) 1M x 9
(4) 256K x 9
8MB
(4) 1M x 9
(4) 1M x 9
16MB
(4) 4M x 9
NONE
17MB
(4) 256K x 9
(4) 4M x 9
17MB
(4) 4M x 9
(4) 256K x 9
20MB
(4) 1M x 9
(4) 4M x 9
20MB
(4) 4M x 9
(4) 1M x 9
32MB
(4) 4M x 9
(4) 4M x 9

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
1MB
(4) 128K x 8
(4) 128K x 8
(1) 128K x 8

CACHE JUMPER CONFIGURATION
Size
JP20
JP21
JP22
JP23
JP24
JP25
64KB
2 & 3
2 & 3
2 & 3
Open
2 & 3
2 & 3
128KB
1 & 2
Open
1 & 2
Closed
1 & 2
1 & 2
256KB
2 & 3
1 & 2
2 & 3
Open
2 & 3
2 & 3
1MB
2 & 3
1 & 2
2 & 3
Open
2 & 3
2 & 3
Note: Pins designated should be in the closed positon.

CACHE JUMPER CONFIGURATION (CON’T)
Size
JP26
JP27
JP31
JP32
JP33
JP34
JP35
64KB
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
Closed
128KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
Closed
256KB
2 & 3
2 & 3
1 & 2
2 & 3
2 & 3
1 & 2
Closed
1MB
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
Closed
Note: Pins designated should be in the closed positon.

CPU TYPE CONFIGURATION
Type
JP1
JP3
JP4
80486SX
pins 2 & 3 closed
Open
Open
80486DX
pins 1 & 2 closed
Closed
Closed
80486DX2
pins 1 & 2 closed
Closed
Closed

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80486SX/DX/DX2 (SYMPHONY) Motherboard Settings and Configuration

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Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/50/66(internal)MHz
Chip Set	Symphony
Max. Onboard DRAM	32MB
Cache	64/128/256/1024KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	Floppy drive interface, IDE interface, parallel port, serial ports (2)
NPU Options	4167 (not present on all boards)

CONNECTIONS
Purpose	Location	Purpose	Location
IDE interface	CN1	Turbo LED	JP5
Floppy drive interface	CN2	Speaker	JP7
Parallel port	CN3	Power LED & keylock	JP9
Serial port 2	CN4	Reset switch	JP11
Serial port 1	CN5	IDE interface LED	JP12

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	I/O bus speed select CPUCLK=CCLK2	JP2	pins 1 & 2 closed
	I/O bus speed select CPUCLK=PCLK	JP2	pins 2 & 3 closed
»	Cache support enabled	JP6	Open
	Cache support disabled	JP6	Closed
»	Monitor type select color	JP10	Closed
	Monitor type select monochrome	JP10	Open
»	On board I/O enabled	JP18	pins 2 & 3 closed
	On board I/O disabled	JP18	pins 1 & 2 closed
»	Parallel port IRQ sleect IRQ7	JP19	pins 2 & 3 closed
	Parallel port IRQ sleect IRQ5	JP19	pins 1 & 2 closed
»	Cache controller timing select 1	JP30	pins 1 & 2 closed
	Cache controller timing select 2	JP30	pins 2 & 3 closed
»	CPU oscillator matches CPU speed	JP36	Closed
	CPU oscillator matches 2x CPU speed	JP36	Open
»	CPU algorithm select 3-2-2-2	JP37	Closed
	CPU algorithm select 2-1-1-1	JP37	Open
»	Cache wait state select 0 wait states	JP38	Open
	Cache wait state select 1 wait state	JP38	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	NONE
2MB	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE
5MB	(4) 256K x 9	(4) 1M x 9
5MB	(4) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
17MB	(4) 256K x 9	(4) 4M x 9
17MB	(4) 4M x 9	(4) 256K x 9
20MB	(4) 1M x 9	(4) 4M x 9
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9

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
1MB	(4) 128K x 8	(4) 128K x 8	(1) 128K x 8

CACHE JUMPER CONFIGURATION
Size	JP20	JP21	JP22	JP23	JP24	JP25
64KB	2 & 3	2 & 3	2 & 3	Open	2 & 3	2 & 3
128KB	1 & 2	Open	1 & 2	Closed	1 & 2	1 & 2
256KB	2 & 3	1 & 2	2 & 3	Open	2 & 3	2 & 3
1MB	2 & 3	1 & 2	2 & 3	Open	2 & 3	2 & 3
Note: Pins designated should be in the closed positon.

CACHE JUMPER CONFIGURATION (CON’T)
Size	JP26	JP27	JP31	JP32	JP33	JP34	JP35
64KB	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2	Closed
128KB	1 & 2	1 & 2	1 & 2	1 & 2	2 & 3	1 & 2	Closed
256KB	2 & 3	2 & 3	1 & 2	2 & 3	2 & 3	1 & 2	Closed
1MB	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3	Closed
Note: Pins designated should be in the closed positon.

CPU TYPE CONFIGURATION
Type	JP1	JP3	JP4
80486SX	pins 2 & 3 closed	Open	Open
80486DX	pins 1 & 2 closed	Closed	Closed
80486DX2	pins 1 & 2 closed	Closed	Closed