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M280

OLIVETTI

M280

Processor

80286

Processor Speed

12MHz

Chip Set

Unidentified

Max. Onboard DRAM

1MB

Cache

None

BIOS

Unidentified

Dimensions

355mm x 304mm

I/O Options

Floppy drive interface, parallel port, serial port

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

CN1

Floppy drive interface

CN3

Serial port

CN2

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Memory size select 1MB

JU1 pins 1 & 9

Open

 

Memory size select 512KB

JU1 pins 1 & 9

Closed

»

Parallel port enabled

JU1 pins 6 & 14

Closed

 

Parallel port disabled

JU1 pins 6 & 14

Open

»

Serial port enabled

JU1 pins 7 & 15

Closed

 

Serial port disabled

JU1 pins 7 & 15

Open

»

Factory configured - do not alter

JU1 pins 8 & 16

Open

»

System clock source select 24MHz on board clock

JU2 pins 7 & 15

Open

 

System clock source select external clock

JU2 pins 7 & 15

Closed

»

NPU wait state select 3 wait states

JU2 pins 8 & 16

Closed

 

NPU wait state select 10 wait states

JU2 pins 8 & 16

Open

»

Burn in enabled

JU3 pins 1 & 5

Open

 

Burn in disabled

JU3 pins 1 & 5

Closed

»

Monitor type select color/Olivetti monochrome

JU3 pins 2 & 6

Closed

 

Monitor type select monochrome

JU3 pins 2 & 6

Open

»

32KHz clock enabled

JU3 pins 3 & 7

Closed

 

32KHz clock disabled

JU3 pins 3 & 7

Open

»

Factory configured - do not alter

JU3 pins 4 & 8

Open

»

14MHz clock enabled

JU4

Closed

 

14MHz clock disabled

JU4

Open

»

1.8MHz clock enabled

JU5

Closed

 

1.8MHz clock disabled

JU5

Open

»

Factory configured - do not alter

JU8

Closed

»

Factory configured - do not alter

JU9

Closed

Note: The locations of JU4, JU5, JU8 & JU9 are unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(18) 41256

NONE

1MB

(18) 41256

(18) 41256

CPU SPEED CONFIGURATION

Speed

JU6

JU7

8MHz

Open

Closed

12MHz

Closed

Open

Note: The locations of JU6 & JU7 aare unidentified.

NPU SPEED CONFIGURATION

Speed

JU2 pins 1 & 9

JU2 pins 2 & 10

JU2 pins 3 & 11

JU2 pins 4 & 12

8MHz

Open

Open

Open

Open

12MHz

Closed

Closed

Closed

Closed

NPU SPEED CONFIGURATION (CON’T)

Speed

JU10

JU11

JU12

8MHz

Open

Open

Open

12MHz

Closed

Closed

Closed

Note: The locations of JU10, JU11 & JU12 aare unidentified.

BIOS CONFIGURATION

Type

JU1 pins 2 & 10

JU1 pins 3 & 11

JU1 pins 4 & 12

JU1 pins 5 & 13

27128

Closed

Open

Closed

Open

27256

Open

Closed

Open

Closed

SCROLL MODE CONFIGURATION

Setting

JU2 pins 5 & 13

JU2 pins 6 & 14

Fast scroll

Open

Open

Flicker scroll

Closed

Closed