Commodore MPS-803 User's Guide download pdf (Page 27)

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3.

Reverse

ON/OFF

CHRS(18)/CHRS(146}

By

sending

the

code

[CHRSMBJ]

to

your

printer,

vOu

have

turned

on

the

REVERSE

FIELD

mode.

This

prints

white

letters

on

a

black

background.

By

sending

the

code

[CHRS(146>]

to

your

printer

turns

off

the

REVERSE

FIELD

mode.

32

D.

Printing

Under

Program

Control

You

have seen

how

to

print

a

listing

of

a

simple

BASIC

program

directty

from

the

keyboard.

Although

it is

not

good

programming

practice,

the

following

ex

ample

shows

how

to

prim

a listing

of

a

BASIC

program

under

control

of

the

pro

gram

itself.

First,

enter

the

following

simple

program

into

your

computer's

memory:

10

OPEN

3,

4

20CMD3

30

PRINT

"PROGRAM

CONTROL"

40

UST

H

you

typed

List

on

your

keyboard,

the

program

you

just

entered

would

be

listed

on

your

video

monitor.

Enter

the

RUN

command.

The

following

should

be

printed

on

your

Printer:

PROGRAM

CONTROL

10

OPEN

3,4

20CMD3

30

PRINT

"PROGRAM

CONTROL"

40

LIST

READY.

Now,

entef

the

following

PRINTS

(UnHsten

the

channel)

CLOSE3

(Close

the

channel)

The

RUN

command

instructed

the

computer

tD

execute

the

program

in

its

memory.

First,

file#3

(device#4)

was

opened.

Next,

the

CMD

command

instruc

ted the

computer

to

direct

ail

subsequent

output

to

file#3.

The

program

then

PRINTed

PROGRAM

CONTROL

on

file

^.

The

LIST commar>d

instructed

the

computer

to

print

a

listing

of

the

program

in

its

memory

on

REMEMBER

-

when

using

the

LIST

command

within

a

program,

you

must

type

the

PRINTS

Ifn

command

to

unlisten

the

printer

Then

you

must

type

in

the

CLOSE

Ifn

command

to

cfose the

file.

Both

of these

commands

can

be

entered

into

the

program

or

after

you

have

RUN

the

Program.

Using

the

LIST

command

or the

CMD

command

in

a

program

fs

generally

not

a

good

program

ming

practice.

It

is

suggested

that

you

only

use

them

in

DIRECT

mode.

E,

Secondary

Address

Earlier

in

this

guide,

you

were

introduced

to the

secondary

address

concept

in

the

discussion

of

the

OPEN

statement.

This

unique

feature

allows

you

to

in

struct

your

new

Printer

to

do

following

operations:

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