M-421 Motherboard Settings and Configuration

Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	PC Chips
Video Chip Set	None
Maximum Onboard Memory	32MB
Maximum Video Memory	None
Cache	None
BIOS	AMI
Dimensions	220mm x 220mm
I/O Options	None
NPU Options	4167

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J1	Turbo switch	J4
Power LED & keylock	J2	Reset switch	J5
Turbo LED	J3	External battery	JP4

USER CONFIGURABLE SETTINGS
Function		Label	Position
	Battery type select internal	JP4	Pins 2 & 3 closed
	Battery type select external	JP4	Open
	CMOS memory clear	JP4	Pins 3 & 4 closed
»	Monitor type select monochrome	JP5	Open
	Monitor type select color	JP5	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	None
2MB	(4) 256K x 9	(4) 256K x 9
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
32MB	(4) 4M x 9	(4) 4M x 9

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

NPU SELECTION

Note: To install a 4167 NPU, install the Math Coprocessor Daughterboard over the CPU socket.