SYSTEM 486/T Motherboard Settings and Configuration

DELL COMPUTER CORPORATION

SYSTEM 486/T

Processor
80486SX/80487SX/80486DX/ODP486SX/80486DX2/ODP586SX
Processor Speed
16/20/25/32(internal)/33/40(internal)/40/50(internal)/66(internal)
Chip Set
Headland
Max. Onboard DRAM
64MB
SRAM Cache
128KB (on optional card)
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
Floppy drive interface, IDE interface, bus mouse port
parallel port, serial port (2), VGA feature connector, VGA port
video memory module connection
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
VGA port
C1
External cache card
S1
Bus mouse
C2
External battery
J1
Parallel port
JPAR
IDE interface LED
J2
Serial port 1 & 2
JCOM
Speaker
J3
Floppy drive interface
JFLOP
Fan
J4
IDE drive interface
JIDE
Video memory upgrade module
JVMEM1
VGA feature connector
JFEAT
Video memory upgrade module
JVMEM2

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
External cache enabled
JCACHE
closed

External cache disabled
JCACHE
open
»
Password option enabled
EPWD
closed

Password option disabled
EPWD
open
»
Factory configured - do not alter
IOALT
open
»
Flash BIOS upgrade enabled
EFLU
closed

Flash BIOS upgrade disabled (BIOS write protected)
EFLU
open
»
On board VGA interface enabled
EVGA
closed

On board VGA interface disabled
EVGA
open

CPU SPEED CONFIGURATION (JP1)
Speed
pins 1 & 2
pins 3 & 4
pins 5 & 6
pins 7 & 8
pins 9 & 10
16MHz
closed
open
open
open
open
20MHz
open
closed
open
open
open
25MHz
open
open
closed
open
open
33MHz
open
open
open
closed
open
40MHz
open
open
open
open
closed

DRAM CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
Bank 3
4MB
(1) 1M x 36
NONE
NONE
NONE
8MB
(1) 1M x 36
(1) 1M x 36
NONE
NONE
12MB
(1) 1M x 36
(1) 1M x 36
(1) 1M x 36
NONE
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
20MB
(1) 4M x 36
(1) 1M x 36
NONE
NONE
24MB
(1) 4M x 36
(1) 1M x 36
(1) 1M x 36
NONE
32MB
(1) 4M x 36
(1) 4M x 36
NONE
NONE
36MB
(1) 4M x 36
(1) 4M x 36
(1) 1M x 36
NONE
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
64MB
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36
(1) 4M x 36

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SYSTEM 486/T Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2/ODP586SX
Processor Speed	16/20/25/32(internal)/33/40(internal)/40/50(internal)/66(internal)
Chip Set	Headland
Max. Onboard DRAM	64MB
SRAM Cache	128KB (on optional card)
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	Floppy drive interface, IDE interface, bus mouse port parallel port, serial port (2), VGA feature connector, VGA port video memory module connection
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
VGA port	C1	External cache card	S1
Bus mouse	C2	External battery	J1
Parallel port	JPAR	IDE interface LED	J2
Serial port 1 & 2	JCOM	Speaker	J3
Floppy drive interface	JFLOP	Fan	J4
IDE drive interface	JIDE	Video memory upgrade module	JVMEM1
VGA feature connector	JFEAT	Video memory upgrade module	JVMEM2

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	External cache enabled	JCACHE	closed
	External cache disabled	JCACHE	open
»	Password option enabled	EPWD	closed
	Password option disabled	EPWD	open
»	Factory configured - do not alter	IOALT	open
»	Flash BIOS upgrade enabled	EFLU	closed
	Flash BIOS upgrade disabled (BIOS write protected)	EFLU	open
»	On board VGA interface enabled	EVGA	closed
	On board VGA interface disabled	EVGA	open

CPU SPEED CONFIGURATION (JP1)
Speed	pins 1 & 2	pins 3 & 4	pins 5 & 6	pins 7 & 8	pins 9 & 10
16MHz	closed	open	open	open	open
20MHz	open	closed	open	open	open
25MHz	open	open	closed	open	open
33MHz	open	open	open	closed	open
40MHz	open	open	open	open	closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
4MB	(1) 1M x 36	NONE	NONE	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
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
20MB	(1) 4M x 36	(1) 1M x 36	NONE	NONE
24MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	NONE
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
36MB	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36	NONE
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
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36