Commodore A 2091-40 - Page 30

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3-24

Installing

the

A2091-40/A2091

2.

insert

the

RAM

chips

NOTE:

Be

careful

to

properly

align

the

chips

before

inserting

them.

Do

not

force

them

or

bend

the

pins.

Place

the

A2091

on

a

flat

surface.

Turn

the

A2091

so

that

it

matches

the

illustration

on

page

3-25.

It

is

important

that

the

chips

be

inserted

properly.

Each

chip

has

a

notch

or

dot

on

one

end

to

show

the

location

of

pin

1.

When

the

end

with

the

notch

or

dot

is

held

to

the

left,

pin

1

will

be

in

the

lower

left

corner.

The

chip

should

then

be

inserted

so

that

the

notched

end

is

towards

the

left

of

the

board,

as

shown

below.

The

location

for pin

1

is

circled

in

the

Illustration

below.

Align

the

chip

with

the

socket

and

insert

it

with

slight

pressure.

If

you

are

installing

512

kilobytes

of

memory

(4

chips),

insert

them

in

the

four

sockets

labeled

512K.

If

you

are

installing

1

megabyte

of

memory

(8

chips),

insert

them

in

the

eight

sockets

labeled

512K

and

1

MEG.

If

you

are

installing

2

megabytes

of

memory

(16

chips),

insert

them

in

all

16

sockets.

3.

set

the

jumper

You

must

set

a

jumper

on

the

board

to

match

the

amount

of

RAM

installed.

As

shipped,

the

jumper

is

set

to

0/K,

or

no

RAM

installed.

Lift

the

jumper

straight

off

and

replace

it

on

the

set

of

pins

labeled

the

same

as

the

amount

of

RAM

installed

Reconnect

the

A2091

following

the

previously

described

installation

procedure.

After

the

A2091

is

reinstalled,

run

the

RAM

Test,

included

on

the

A2091

Installation

Software

disk,

as

described

on

page

5-7.

I

your

system

fails

to

boot

once

the

RAM

chips

are

installed,

there

is

most

likely

a

problem

in

the

first

512K

of

memory.

Make

sure

that

all

the

RAM

chips

are

installed

in

the

right

direction

and

that

all

the

pins

are

straight,

Check

to

see

if

any

pins

are

curled

under

or

not

fully

inserted.

If

you

find

a

bent

pin,

remove

the

chip,

carefully

straighten

the

pin,

and

then

reinsert

the

chip.

Run

the

RAM

Test

again

to

see

if

the

problem

has

been

corrected.

If

you

cannot

resolve

a

failure,

contact

an

authorized

Commodore

service

center.

—r

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