Campbell 21X Manuale dell'Operatore Scaricare il pdf (Pagina 176)

APPENDIX

E. CHANGING

RAM OR

PROM

CHIPS

The earliest

21Xs

were shipped

with only

two

4K RAM chips.

Current

software does

not

check

for this

condition;

if

an

old 21X

is being

upgraded

to

new sottware

PROMS,

five 8K

RAM chips

(CSl

Modelnumber

EMXS) should

also

be

installed.

The

older 21X

has

iumpers

at

locations M15,

W2O, and

W27

(Figure

E-l).

With

8K

RAM

chips

installed,

Ml5 should

be

jumpered

on

the

right

set of

pins

and

W20 and

W27

should be

jumpered

on

the

left

set

of

Pins.

After changing

RAM chips

reassemble

the

21X,

turn on

the

power

and confirm

that the

power-up

check

shows allgood

RAM.

E.3 CHANGING

PROM CHIPS

PROMs are

installed at

locations

6,

7,

and

8

in

Figure E-l.

The

procedure

for changing

a

PROM

is the same

as

for a

RAM chip,

carefully

pry

out

the old chip

and

insert

the

new one,

being

certain that

the notch

on

the

chip

is

toward

the close

edge of the

card and that

all

pins

are

correctly

seated

in the sockets.

In

general,

the

PROM

chip

with

the

lowest

number

is

inserted

in socket

I

and

the PROM

with

the

highest

number

in

socket

6,

but check

the documentation

received

with the

PROM

update

to be sure.

Afterchanging

PROMS,

reassemble

the

21X

and

turn

on

the

power.

Confirm

that

the

power-

up check

indicates

that

all PROMS

and

RAM

are

good.

Then

check

the

signature

in

the

*B

Mode to be

certain

that they

match

those

sent

with

the

documentation

forthe

PROMS.

E-2

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