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M-421

UNIDENTIFIED

M-421

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.