Commodore MPS-803 User's Guide download pdf (Page 23)

5.

Print

Position

Determination

CHRSO6);

"nHnL"

With

the

POSCode

^CHRS(IG)]

you

can

determine

the

print

start

position.

This

is

done

by

assigning

a 2-digit

number

following

the

CH

RS{16)

(see

the

examples

below).

EXAMPLE

1:

ClO--.-SET

PRINT

POSITION

100

REM

C

1U3

-

120

OPEN

4,4

:REM

PRINT

IN

GRflPHIC

MODE

140

FOR

1=1

TO

4

150

PRINT#4,"B1234367&9"I

160

NEXT

T

170

PRIHT#4

LB0

PRINT#4>PO*;"08";"COMMODORE";

190

PRIHT#4j

PO*.;

":":8".:

"PRINTER";

20©

;

21©

FOP

J=l

TO

:=:-PRINT#4

-

HT

\T

1

226

CL0SE4

RUN

01234'?67oSl£i

1

234^6^8901

23415«57S901

2345578?

COMMODORE

PRINTER

The

two

numbers

following the

CHRS(16)

codes

are

the

print

start

position

of

your

standard

characters.

This

can

be

proven

using

the following

example.

EXAMPLE

2:

190

REtf

CVHR*<16>

SET

PRINT

POSITION

110

120

OPEN

4,4

--REM

PRINT

IN

GPRFKIC

MODE

L40

FOR

1=1.

TO

4

1

5©

PR

I

NTS

4,

"

@

1234567S911

i

[SB

MEKT

I

170

PRIHT#4

L75

PRIMT#4,EH$;

i

30

PR

I

NT*M

,

PO*.-

"

OS

"

.■

1f

CDnH'

p|'-"!!.:i

■

sa

NOTE:

If

you

want

to

change

a

printer

device

numbsr,

you

can

have

it

changed

by

DIP

switch

(you

might

want

to

have

a

printer's

device

number

changed

if

you

have

two

printers

attached

to

your

computer.

You

need

to

refer

to

each

of

the

individually;

hence, the

need

to

change one

of

the device

numbers.)

Is

the

secondary

addre&s,

a

unique

way

of

instructing

your

Printer's

internal

microprocessor

to

perform

certain

specific

tasks.

More

about

this

important

feature

later.

2.

The

PRINT*

Command;

This

cammand

works

just

like

the

BASIC

PRtNT

cammand

except

that

it

directs

the

output

to

the

Primer

instead

of

the

video

screen.

The

abbreviation

for

PRINTS

is

pR

(unshifted

p

and

shifted

RL

There

must

be

no

space

before

the

#,

and

spaces

after

the

#

are

ignored.

The

format

is

as

fol

lows:

PRINT;

Ifn

<,

variable/data

>

where:

Ifn

Is

the

logical

file

Ifniber

{any

number

from

1

to

255).

This

number

must

correspond

to

a

given

OPEN

command.

Oariableydata

>

will

be

discussed

in

detail

later

in

this

user's

guide.

3,

The

CLOSE

Command:

Careful

use

of

this

command

is

important

because

you

may

only

have

a

maxi

mum

of

ten

files

open

at

any

one

time.

Programming

your

Printer

may

require

that

you

keep

several

files

open

simultaneously.

Always

close

files

when

you

are

finished

using

them.

The

format

is

as

follows:

CLOSE

Ifn

where:

Ifn

is

the

logical

file

number

of

the

file

being

closed,

this

number

must

correspond

\o

a

given

OPEN

command.

4.

The

CMD

Command:

Good

programming

practice

dictates

never

using

this

statement

wcthin

a

pro

gram;

use

this

statement

in

direct

mode

only.

This

statement

transfers

the

primary

output

device

(TV

screen)

to

the

logical

file

number

specified

in

the

command.

The

file

must

have

been

previously

OPENed.

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