DECPC LPX Motherboard Settings and Configuration

DIGITAL EQUIPMENT CORPORATION

DECPC LPX

Processor
80486SX/80486DX/80486DX2
Processor Speed
25/33/40/50(internal)/50/66(internal)MHz
Chip Set
Unidentified
Video Chip Set
None
Maximum Onboard Memory
64MB
Maximum Video Memory
None
Cache
128/256KB
BIOS
Unidentified
Dimensions
254mm x 218mm
I/O Options
32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Parallel port
CN1
IDE interface
CN5
Serial port
CN2
Floppy drive interface
CN6
Serial port
CN3
32-bit VESA local bus slots
SL1 & SL2
PS/2 mouse port
CN4

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
Flash BIOS normal operation
J14
Open

Flash BIOS recovery mode
J14
Closed
»
Monitor type select monochrome
J15
Open

Monitor type select color
J15
Closed
»
Factory configured – do not alter
J16
Open
»
VLRDY >CPURDY connects to CPU bus ready
J28
Pins 1 & 2 closed

VLRDY >LRDY synchronized through chipset
J28
Pins 2 & 3 closed
»
Reset switch enabled
J33
Closed

Reset switch disabled
J33
Open

DRAM CONFIGURATION
Size
Bank 0
Bank 1
4MB
(2) 256K x 36
(2) 256K x 36
4MB
(2) 512K x 36
None
8MB
(2) 1M x 36
None
16MB
(2) 2M x 36
None
16MB
(2) 1M x 36
(2) 1M x 36
24MB
(2) 2M x 36
(2) 1M x 36
32MB
(2) 4M x 36
None
32MB
(2) 2M x 36
(2) 2M x 36
40MB
(2) 4M x 36
(2) 1M x 36
48MB
(2) 4M x 36
(2) 2M x 36
64MB
(2) 4M x 36
(2) 4M x 36
Note: The location of banks 0 & 1 are unidentified.

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
128KB
(4) 32K x 8
None
(3) 16K x 4
256KB
(4) 32K x 8
(4) 32K x 8
(3) 16K x 4

CACHE JUMPER CONFIGURATION
Size
J35
J36
J37
J38
None
Open
Open
Open
Open
128KB
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
Pins 1 & 2 closed
256KB
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed
Pins 2 & 3 closed

CPU SPEED SELECTION
Speed
J24
J25
J26
25MHz
Closed
Closed
Open
33MHz
Closed
Open
Closed
40MHz
Open
Open
Closed
50iMHz
Closed
Closed
Open
50MHz
Open
Open
Open
66iMHz
Closed
Open
Closed

VL BUS WAIT STATE SELECTION
Setting
J27
»
0
Pins 1 & 2 closed

1
Pins 2 & 3 closed

Headaches Begone! A Systemic Approach To Healing Your Headaches

Don't Let Your Bike Seat Ruin Your Sex Life Book

DECPC LPX Motherboard Settings and Configuration

Search

My Books

Discover

Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	64MB
Maximum Video Memory	None
Cache	128/256KB
BIOS	Unidentified
Dimensions	254mm x 218mm
I/O Options	32-bit VESA local bus slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Parallel port	CN1	IDE interface	CN5
Serial port	CN2	Floppy drive interface	CN6
Serial port	CN3	32-bit VESA local bus slots	SL1 & SL2
PS/2 mouse port	CN4

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Flash BIOS normal operation	J14	Open
	Flash BIOS recovery mode	J14	Closed
»	Monitor type select monochrome	J15	Open
	Monitor type select color	J15	Closed
»	Factory configured – do not alter	J16	Open
»	VLRDY >CPURDY connects to CPU bus ready	J28	Pins 1 & 2 closed
	VLRDY >LRDY synchronized through chipset	J28	Pins 2 & 3 closed
»	Reset switch enabled	J33	Closed
	Reset switch disabled	J33	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(2) 256K x 36	(2) 256K x 36
4MB	(2) 512K x 36	None
8MB	(2) 1M x 36	None
16MB	(2) 2M x 36	None
16MB	(2) 1M x 36	(2) 1M x 36
24MB	(2) 2M x 36	(2) 1M x 36
32MB	(2) 4M x 36	None
32MB	(2) 2M x 36	(2) 2M x 36
40MB	(2) 4M x 36	(2) 1M x 36
48MB	(2) 4M x 36	(2) 2M x 36
64MB	(2) 4M x 36	(2) 4M x 36
Note: The location of banks 0 & 1 are unidentified.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	None	(3) 16K x 4
256KB	(4) 32K x 8	(4) 32K x 8	(3) 16K x 4

CACHE JUMPER CONFIGURATION
Size	J35	J36	J37	J38
None	Open	Open	Open	Open
128KB	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
256KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed

CPU SPEED SELECTION
Speed	J24	J25	J26
25MHz	Closed	Closed	Open
33MHz	Closed	Open	Closed
40MHz	Open	Open	Closed
50iMHz	Closed	Closed	Open
50MHz	Open	Open	Open
66iMHz	Closed	Open	Closed

VL BUS WAIT STATE SELECTION
Setting		J27
»	0	Pins 1 & 2 closed
	1	Pins 2 & 3 closed