286/12 (EV-1815) - (SIMM VERSION) Motherboard Settings and Configuration

Processor

80286

Processor Speed

12MHz

Chip Set

None

Max. Onboard DRAM

1MB

Cache

None

BIOS

AMI

Dimensions

355mm x 304mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Front panel display

J1

External battery

J4

Speaker

J2

Note: NPU speed must equal the speed of oscillator Y5 divided by 3. The location of jumper J4 is unidentified.

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Monitor type select monochrome

SW1/1

Off

Monitor type select color

SW1/1

On

»

Factory configured - do not alter

W1

N/A

»

Expansion bus (8-bit) speed select 6 wait states

W2

pins 5 & 6 closed

»

Expansion bus (8-bit) speed select 5 wait states

W2

pins 3 & 4 closed

Expansion bus (8-bit) speed select 4 wait states

W2

pins 1 & 2 closed

»

Expansion bus (16-bit) speed select 2 wait states

W3

pins 5 & 6 closed

Expansion bus (16-bit) speed select 1 wait states

W3

pins 7 & 8 closed

Expansion bus (16-bit) speed select 3 wait states

W3

pins 3 & 4 closed

Expansion bus (16-bit) speed select 4 wait states

W3

pins 1 & 2 closed

»

Factory configured - do not alter

W4

N/A

»

Factory configured - do not alter

W5

N/A

»

Factory configured - do not alter

W6

pins 1 & 2 open

»

Factory configured - do not alter

W6

pins 5 & 6 open

»

Factory configured - do not alter

W6

pins 7 & 8 closed

»

Factory configured - do not alter

W7

pins 1 & 2 closed

»

Factory configured - do not alter

W8

pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

512KB

(2) 256K x 9

NONE

1MB

(2) 256K x 9

(2) 256K x 9

DRAM JUMPER CONFIGURATION

Size

W6

512KB

pins 3 & 4 closed

1MB

pins 3 & 4 open