Processor	80486SX/ODP486/80487SX/80486DX/80486DX2
Processor Speed	16/20/25/33/50(internal)/66(internal)MHz
Chip Set	OPTI
Video Chip Set	None
Maximum Onboard Memory	64MB
Maximum Video Memory	None
Cache	64/128/256KB
BIOS	Phoenix
Dimensions	426mm x 416mm
I/O Options	32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, serial ports (2)
NPU Options	None

CONNECTIONS
Function	Label	Function	Label
Chassis fan power	CN1	Serial port 2	J18
External battery	CN2	Parallel port	J19
Floppy drive interface	J13	Front panel connector	J25
IDE interface	J14	32-bit VESA local bus slot	SL1
Serial port 1	J16

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Flash BIOS normal boot	J3	Pins 2 & 3 closed
	Flash BIOS recovery mode boot	J3	Pins 1 & 2 closed
»	On board I/O enabled	J4	Pins 1 & 2 closed
	On board I/O disabled	J4	Pins 2 & 3 closed
»	Password normal operation	J7	Pins 2 & 3 closed
	Password clear	J7	Pins 1 & 2 closed
»	Parallel port direction select output	J9	Pins 1 & 2 closed
	Parallel port direction select input	J9	Pins 2 & 3 closed
»	Parallel port direction select hardware for redirection	J11	Pins 2 & 3 closed
	Parallel port direction select software hardware for redirection	J11	Pins 1 & 2 closed
»	Battery type select 3.6v/4.5v	J17	Pins 2 & 3 closed
	Battery type select 6v	J17	Pins 1 & 2 closed
»	CMOS memory normal operation	J25 pins 17 & 18	Closed
	CMOS memory clear	J25 pins 17 & 18	Open
»	Fan enabled	J29	Pins 2 & 3 closed
	Fan disabled	J29	Pins 1 & 2 closed
»	12v flash BIOS enabled	J30	Pins 1 & 2 closed
	12v flash BIOS disabled	J30	Pins 2 & 3 closed
»	Local bus ready select delayed	J31	Pins 1 & 2 closed
	Local bus ready select normal operation	J31	Pins 2 & 3 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) 1M x 36	None	None	None
4MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
5MB	(1) 1M x 36	(1) 256K x 36	None	None
5MB	(1) 256K x 36	(1) 1M 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) 256K x 36	(1) 1M x 36	(1) 1M x 36	None

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	None
13MB	(1) 256K x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 4M x 36	None	None	None
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
17MB	(1) 4M x 36	(1) 256K x 36	None	None
17MB	(1) 256K x 36	(1) 4M 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
20MB	(1) 1M x 36	(1) 4M x 36	None	None
24MB	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36	None
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) 256K x 36	(1) 4M x 36	(1) 4M x 36	None
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	None
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	None
49MB	(1) 256K x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
52MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
Note: The orientation of the banks is unidentified.

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
128KB	(4) 32K x 8	None
256KB	(4) 32K x 8	(4) 32K x 8
Note: The chip sizes of the TAG and DIRTY bit are unidentified.

CACHE JUMPER CONFIGURATION
Size	J34
None	Open
64KB	Open
128KB	Pins 1 & 2, 5 & 6 closed
256KB	Pins 1 & 2, 3 & 4, 7 & 8 closed

CPU SPEED SELECTION
Speed	J5	J6
16MHz	Pins 1 & 2 closed	Pins 1 & 2 closed
20MHz	Pins 2 & 3 closed	Pins 1 & 2 closed
25MHz	Pins 1 & 2 closed	Pins 2 & 3 closed
33MHz	Pins 2 & 3 closed	Pins 2 & 3 closed
50iMHz	Pins 1 & 2 closed	Pins 2 & 3 closed
66iMHz	Pins 2 & 3 closed	Pins 2 & 3 closed

CPU TYPE SELECTION
Type	J32	J33
80486SX	Pins 3 & 4 closed	Pins 4 & 6 closed
80487SX	Pins 1 & 2, 5 & 6 closed	Pins 1 & 3, 2 & 4 closed
ODP486	Pins 1 & 2, 5 & 6 closed	Pins 1 & 3, 2 & 4 closed
80486DX	Pins 1 & 2, 5 & 6 closed	Pins 3 & 5, 4 & 6 closed
80486DX2	Pins 1 & 2, 5 & 6 closed	Pins 3 & 5, 4 & 6 closed

MISCELLANEOUS TECHNICAL NOTE

The location of pin 1 on all jumpers is unidentified.