SYSTEM BOARD PCD-4LDX Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Unidentified
Video Chip Set	Unidentified
Maximum Onboard Memory	32MB
Maximum Video Memory	2MB
Cache	64/128/256KB
BIOS	Unidentified
Dimensions	330mm x 218mm
I/O Options	Ethernet 10Base5 connector, Ethernet 10BaseT connector, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
VGA port	CN1	Floppy drive interface	CN8
Parallel port	CN2	IDE interface	CN9
Serial port 2	CN3	VGA feature connector	CN10
Serial port 1	CN4	External battery	CN11
PS/2 mouse port	CN5	Speaker	J13
Ethernet 10Base5 connector	CN6	Front panel connector	JP30
Ethernet 10BaseT connector	CN7	Riser slot	SL1

USER CONFIGURABLE SETTINGS
Function		Label	Position
?	Factory configured - do not alter	CN12	Unidentified
?	Factory configured - do not alter	CN13	Unidentified
?	Factory configured - do not alter	CN14	Unidentified
?	Internal speaker enabled	J13	Pins 1 & 2 closed
	Internal speaker disabled	J13	Open
	External speaker enabled	J13	Closed
?	Monitor type select color	JP10	Closed
	Monitor type select monochrome	JP10	Open
?	PS/2 mouse IRQ12 enabled	JP11	Closed
	PS/2 mouse IRQ12 disabled	JP11	Open
?	On board video enabled	JP25	Closed
	On board video disabled	JP25	Open
?	LAN interface enabled	JP31	Open
	LAN interface disabled	JP31	Closed
?	System booted from hard drive	JP32	Open
	System booted from network	JP32	Closed
?	LAN type select 10BaseT	JP37	Pins 1 & 2 closed
	LAN type select 10Base5	JP37	Pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(4) 1M x 9	None
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	None
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 (U48)	TAG (U49)	TAG (U50)
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8	None	(1) 16K x 4
128KB	(4) 32K x 8	None	(1) 8K x 8	None	(1) 16K x 4
256KB	(4) 32K x 8	(4) 32K x 8	(1) 8K x 8	(1) 8K x 8	(1) 16K x 4
Note: The location of banks 0 & 1 and the TAG are unidentified.

CACHE JUMPER CONFIGURATION
Size	JP12	JP13	JP14	JP15	JP16	JP17
None	2 & 3	2 & 3	Open	Open	Open	Open
64KB	2 & 3	2 & 3	Open	Open	Open	Open
128KB	1 & 2	1 & 2	Closed	Open	Open	Closed
256KB	2 & 3	2 & 3	Closed	Closed	Closed	Closed
Note: Pins designated should be in the closed position.

VIDEO MEMORY CONFIGURATION
Size	Bank 0	Bank 1
1MB	1MB	None
2MB	1MB	1MB
Note: The size of the video memory chips is unidentified.

CPU SPEED SELECTION
Speed	JP5	JP6
25MHz	Closed	Open
33MHz	Open	Closed
50iMHz	Closed	Open
66iMHz	Open	Closed

CPU TYPE SELECTION
Type	JP1	JP2	JP3
80486SX	Open	Pins 1 & 2 closed	Open
80486DX	Pins 1 & 2 closed	Pins 2 & 3 closed	Closed
80486DX2	Pins 1 & 2 closed	Pins 2 & 3 closed	Closed

LAN DMA CHANNEL SELECTION
Channel		JP35	JP36
»	5	Pins 1 & 2 closed	Pins 1 & 2 closed
	6	Pins 3 & 4 closed	Pins 3 & 4 closed

LAN IRQ SELECTION
IRQ		JP34
	None	Open
»	IRQ5	Pins 1 & 2 closed
	IRQ9	Pins 3 & 4 closed
	IRQ10	Pins 5 & 6 closed
	IRQ11	Pins 7 & 8 closed

LAN I/O ADDRESS SELECTION
Setting		JP33
»	300H	Pins 1 & 2, 3 & 4 closed
	320H	Pins 3 & 4 closed
	340H	Pins 1 & 2 closed
	360H	Open