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MICROFRAME 486M

MONOLITHIC SYSTEMS, INC. (COLORADO MSI)

MICROFRAME 486M

   

Processor

80486DX

Processor Speed

25MHz

Chip Set

C & T

Max. Onboard DRAM

8MB

Cache

None

BIOS

Quadtel

Dimensions

330.2mm x 221mm

I/O Options

32-bit external memory card slot

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo LED

J10

Drive active LED

J3

CPU ready LED

J11

Front panel ribbon cable

J6

Speaker

J19

Reset switch

J7

Power LED & keylock

J40

Auxiliary keyboard

J8

32-bit external memory card

S1

Note:If the front panel Drive LED is to be used, the drive active signal from the drive or drive controller

must be connected to J3/pins 1 & 2 or J3/pins 2 & 3.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

J2

Open

 

CMOS memory clear

J2

Closed

DMA active signal select high

J12

Closed

 

DMA active signal select low

J12

Open

NPU parity check enabled

J13

Closed

 

NPU parity check disabled

J13

Open

Internal CPU cache enabled

J16

Closed

 

Internal CPU cache disabled

J16

Open

NPU zero wait state enabled

J17

Closed

 

NPU zero wait state disabled

J17

Open

Internal CPU caching of BIOS disabled

J18

pins 1 & 2 open

 

Internal CPU caching of BIOS enabled

J18

pins 1 & 2 closed

 

Í Factory test jumper- do not alter

J24

Closed

POST enabled

J25

Closed

 

POST disabled

J25

Open

Factory test jumper - do not alter

J26

Closed

NPU disabled

J33

Open

 

NPU enabled

J33

Closed

Factory test jumper - do not alter

J34

Closed

Factory test jumper - do not alter

J35

Closed

Factory test jumper - do not alter

J36

Closed

Monitor type select color

J39

pins 2 & 3 closed

 

Monitor type select monochrome

J39

pins 1 & 2 closed

Note:Locations of J18, J34, J35, & J36 are unknown.

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

J6 - RIBBON CABLE CONNECTOR

PIN ASSIGNMENTS