SYSTEM 486P Motherboard Settings and Configuration

DELL COMPUTER CORPORATION

SYSTEM 486P

Processor
80486DX
Processor Speed
16/20/25/33MHz
Chip Set
VLSI
Max. Onboard DRAM
64MB
Cache
None
BIOS
Phoenix
Dimensions
349mm x 185mm
I/O Options
Bus mouse port, floppy interface, IDE interface, parallel port, riser card slot, serial ports (2), video upgrade socket, VGA port
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
16-bit riser card
EXP1
Auxiliary ground points
GND
IDE interface LED
JHDLED
IDE interface
JIDE
External battery
JBAT
Power LED & turbo LED
JLED
Serial port 1
JCOM1
Parallel port
JLPT1
Serial port 2
JCOM2
Bus mouse port
JMOUSE
Cooling fan power
JFAN
VGA memory upgrade socket
JVDB
VGA pass-through
JFEAT
Front panel status LCD
JVIEW
Floppy drive interface
JFLOP
VGA port
JVGA

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
VGA interrupt request select none
JP5 pins 1 & 2
Closed

VGA interrupt request select IRQ9
JP5 pins 1 & 2
Open
»
Monitor type select color
JP5 pins 3 & 4
Closed

Monitor type select monochrome
JP5 pins 3 & 4
Open
»
Factory configured - do not alter
JP5 pins 5 & 6
Open
»
Factory configured - do not alter
JP5 pins 7 & 8
Open
»
Password check enabled
JP5 pins 9 & 10
Closed

Password check disabled
JP5 pins 9 & 10
Open
»
Mouse port enabled (uses IRQ12)
JP5 pins 11 & 12
Closed

Mouse port disabled (IRQ12 not used)
JP5 pins 11 & 12
Open
»
IOCHRDY signal disabled to IDE drive(s)
JP5 pins 13 & 14
JP5 pins 15 & 16
Closed
Open

IOCHRDY signal enabled to IDE drive(s)
JP5 pins 13 & 14
JP5 pins 15 & 16
Open
Closed
»
Bus wait states select none
JP5 pins 17 & 18
Closed

Bus wait state select one
JP5 pins 17 & 18
Open
»
Factory configured - do not alter
JP5 pins 19 & 20
Open
»
Factory configured - do not alter
CLRB
Open

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
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

DRAM CONFIGURATION (CON’T)
Size
Bank 0
Bank 1
Bank 2
Bank 3
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
Closed
Open
Open
Open
20MHz
Open
Closed
Open
Open
25MHz
Open
Open
Closed
Open
33MHz
Open
Open
Open
Closed

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SYSTEM 486P Motherboard Settings and Configuration

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Processor	80486DX
Processor Speed	16/20/25/33MHz
Chip Set	VLSI
Max. Onboard DRAM	64MB
Cache	None
BIOS	Phoenix
Dimensions	349mm x 185mm
I/O Options	Bus mouse port, floppy interface, IDE interface, parallel port, riser card slot, serial ports (2), video upgrade socket, VGA port
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
16-bit riser card	EXP1	Auxiliary ground points	GND
IDE interface LED	JHDLED	IDE interface	JIDE
External battery	JBAT	Power LED & turbo LED	JLED
Serial port 1	JCOM1	Parallel port	JLPT1
Serial port 2	JCOM2	Bus mouse port	JMOUSE
Cooling fan power	JFAN	VGA memory upgrade socket	JVDB
VGA pass-through	JFEAT	Front panel status LCD	JVIEW
Floppy drive interface	JFLOP	VGA port	JVGA

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	VGA interrupt request select none	JP5 pins 1 & 2	Closed
	VGA interrupt request select IRQ9	JP5 pins 1 & 2	Open
»	Monitor type select color	JP5 pins 3 & 4	Closed
	Monitor type select monochrome	JP5 pins 3 & 4	Open
»	Factory configured - do not alter	JP5 pins 5 & 6	Open
»	Factory configured - do not alter	JP5 pins 7 & 8	Open
»	Password check enabled	JP5 pins 9 & 10	Closed
	Password check disabled	JP5 pins 9 & 10	Open
»	Mouse port enabled (uses IRQ12)	JP5 pins 11 & 12	Closed
	Mouse port disabled (IRQ12 not used)	JP5 pins 11 & 12	Open
»	IOCHRDY signal disabled to IDE drive(s)	JP5 pins 13 & 14 JP5 pins 15 & 16	Closed Open
	IOCHRDY signal enabled to IDE drive(s)	JP5 pins 13 & 14 JP5 pins 15 & 16	Open Closed
»	Bus wait states select none	JP5 pins 17 & 18	Closed
	Bus wait state select one	JP5 pins 17 & 18	Open
»	Factory configured - do not alter	JP5 pins 19 & 20	Open
»	Factory configured - do not alter	CLRB	Open

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
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

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
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	Closed	Open	Open	Open
20MHz	Open	Closed	Open	Open
25MHz	Open	Open	Closed	Open
33MHz	Open	Open	Open	Closed