System 486D Motherboard Settings and Configuration

DELL COMPUTER CORPORATION

System 486D

Processor
80486SX/80487SX/80486DX
Processor Speed
16/20/25/33
Chip Set
VLSI
Max. Onboard DRAM
64MB
Cache
None
BIOS
AMI
Dimensions
329mm x 334mm
I/O Options
Bus mouse, floppy interface, IDE interface, parallel port, serial ports (2), VGA port
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
VGA port
CN1
External battery
JBAT
Parallel port
CN2
Cooling fan
JFAN
Serial port 2
CN3
VGA pass-through
JFEAT
Serial port 1
CN4
Primary floppy drive interface
JFLOP
Bus mouse port
CN5
IDE interface
JIDE
Board ground points
GND
Front panel status LCD
JVIEW
IDE interface LED
JLED

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Boot EEPROM select normal operation
CLRB
Open

Boot EEPROM clear
CLRB
Closed
»
VGA interrupt request select none
JP5 pins 1 & 2
Open

VGA interrupt request select IRQ9
JP5 pins 1 & 2
Closed
»
Factory configured - do not alter
JP5 pins 3 & 4
Open
»
Monitor type select color
JP5 pins 5 & 6
Closed

Monitor type select monochrome
JP5 pins 5 & 6
Closed
»
Factory configured - do not alter
JP5 pins 7 & 8
Open
»
Password check disabled
JP5 pins 9 & 10
Open

Password check enabled
JP5 pins 9 & 10
Closed
»
Monitor type select standard VGA
JP5 pins 11 & 12
Open

Monitor type select Multifrequency (MultiSync) VGA
JP5 pins 11 & 12
Closed
»
IOCHRDY wait state(s) disabled
JP5 pins 17 & 18
Closed

IOCHRDY wait state(s) enabled
JP5 pins 17 & 18
Open
»
Boot source select normal (floppy or hard drive)
JP5 pins 19 & 20
Open

Boot source select Boot EEPROM on AT bus
JP5 pins 19 & 20
Closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
1MB
(1) 256K x 36
NONE
NONE
NONE
2MB
(1) 256K x 36
(1) 256K x 36
NONE
NONE
3MB
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
NONE
4MB
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
4MB
(1) 1M x 36
NONE
NONE
NONE
5MB
(1) 1M x 36
(1) 256K x 36
NONE
NONE
6MB
(1) 1M x 36
(1) 256K x 36
(1) 256K x 36
NONE
7MB
(1) 1M x 36
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
8MB
(1) 1M x 36
(1) 1M x 36
NONE
NONE
9MB
(1) 1M x 36
(1) 1M x 36
(1) 256K x 36
NONE
10MB
(1) 1M x 36
(1) 1M x 36
(1) 256K x 36
(1) 256K x 36
12MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
NONE
13MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
(1) 256K x 36
16MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36

DRAM CONFIGURATION (CON’T)
Size
Bank 0
Bank 1
Bank 2
Bank 3
16MB
(1) 4M x 36
NONE
NONE
NONE
17MB
(1) 4M x 36
(1) 256K x 36
NONE
NONE
18MB
(1) 4M x 36
(1) 256K x 36
(1) 256K x 36
NONE
19MB
(1) 4M x 36
(1) 256K x 36
(1) 256K x 36
(1) 256K x 36
20MB
(1) 4M x 36
(1) 1M x 36
NONE
NONE
21MB
(1) 4M x 36
(1) 1M x 36
(1) 256K x 36
NONE
22MB
(1) 4M x 36
(1) 1M x 36
(1) 256K x 36
(1) 256K x 36
24MB
(1) 4M x 36
(1) 1M x 36
(1) 1M x 36
NONE
25MB
(1) 4M x 36
(1) 1M x 36
(1) 1M x 36
(1) 256K x 36
28MB
(1) 4M x 36
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
32MB
(1) 4M x 36
(1) 4M x 36
NONE
NONE
33MB
(1) 4M x 36
(1) 4M x 36
(1) 256K x 36
NONE
34MB
(1) 4M x 36
(1) 4M x 36
(1) 256K x 36
(1) 256K x 36
36MB
(1) 4M x 36
(1) 4M x 36
(1) 1M x 36
NONE
37MB
(1) 4M x 36
(1) 4M x 36
(1) 1M x 36
(1) 256K x 36
40MB
(1) 4M x 36
(1) 4M x 36
(1) 1M x 36
(1) 1M x 36
48MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
NONE
49MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
(1) 256K x 36
52MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
(1) 1M x 36
64MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36

CPU SPEED CONFIGURATION
Speed
JP1
JP2
JP3
JP4
16MHz
Open
Open
Open
Closed
20MHz
Open
Open
Closed
Open
25MHz
Open
Closed
Open
Open
33MHz
Closed
Open
Open
Open

IOCHRDY CONFIGURATION
Setting
JP5 pins 13 & 14
Signal disabled to IDE drive(s)
Closed
Signal enabled to IDE drive(s)
Open

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System 486D Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX
Processor Speed	16/20/25/33
Chip Set	VLSI
Max. Onboard DRAM	64MB
Cache	None
BIOS	AMI
Dimensions	329mm x 334mm
I/O Options	Bus mouse, floppy interface, IDE interface, parallel port, serial ports (2), VGA port
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
VGA port	CN1	External battery	JBAT
Parallel port	CN2	Cooling fan	JFAN
Serial port 2	CN3	VGA pass-through	JFEAT
Serial port 1	CN4	Primary floppy drive interface	JFLOP
Bus mouse port	CN5	IDE interface	JIDE
Board ground points	GND	Front panel status LCD	JVIEW
IDE interface LED	JLED

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Boot EEPROM select normal operation	CLRB	Open
	Boot EEPROM clear	CLRB	Closed
»	VGA interrupt request select none	JP5 pins 1 & 2	Open
	VGA interrupt request select IRQ9	JP5 pins 1 & 2	Closed
»	Factory configured - do not alter	JP5 pins 3 & 4	Open
»	Monitor type select color	JP5 pins 5 & 6	Closed
	Monitor type select monochrome	JP5 pins 5 & 6	Closed
»	Factory configured - do not alter	JP5 pins 7 & 8	Open
»	Password check disabled	JP5 pins 9 & 10	Open
	Password check enabled	JP5 pins 9 & 10	Closed
»	Monitor type select standard VGA	JP5 pins 11 & 12	Open
	Monitor type select Multifrequency (MultiSync) VGA	JP5 pins 11 & 12	Closed
»	IOCHRDY wait state(s) disabled	JP5 pins 17 & 18	Closed
	IOCHRDY wait state(s) enabled	JP5 pins 17 & 18	Open
»	Boot source select normal (floppy or hard drive)	JP5 pins 19 & 20	Open
	Boot source select Boot EEPROM on AT bus	JP5 pins 19 & 20	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	NONE	NONE	NONE
2MB	(1) 256K x 36	(1) 256K x 36	NONE	NONE
3MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	NONE
4MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
4MB	(1) 1M x 36	NONE	NONE	NONE
5MB	(1) 1M x 36	(1) 256K x 36	NONE	NONE
6MB	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36	NONE
7MB	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
9MB	(1) 1M x 36	(1) 1M x 36	(1) 256K x 36	NONE
10MB	(1) 1M x 36	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
13MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 256K x 36
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
16MB	(1) 4M x 36	NONE	NONE	NONE
17MB	(1) 4M x 36	(1) 256K x 36	NONE	NONE
18MB	(1) 4M x 36	(1) 256K x 36	(1) 256K x 36	NONE
19MB	(1) 4M x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
20MB	(1) 4M x 36	(1) 1M x 36	NONE	NONE
21MB	(1) 4M x 36	(1) 1M x 36	(1) 256K x 36	NONE
22MB	(1) 4M x 36	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36
24MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	NONE
25MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	(1) 256K x 36
28MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
33MB	(1) 4M x 36	(1) 4M x 36	(1) 256K x 36	NONE
34MB	(1) 4M x 36	(1) 4M x 36	(1) 256K x 36	(1) 256K x 36
36MB	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36	NONE
37MB	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36	(1) 256K x 36
40MB	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
49MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 256K x 36
52MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36

CPU SPEED CONFIGURATION
Speed	JP1	JP2	JP3	JP4
16MHz	Open	Open	Open	Closed
20MHz	Open	Open	Closed	Open
25MHz	Open	Closed	Open	Open
33MHz	Closed	Open	Open	Open

IOCHRDY CONFIGURATION
Setting	JP5 pins 13 & 14
Signal disabled to IDE drive(s)	Closed
Signal enabled to IDE drive(s)	Open