Viper 2.08 User's Guide download pdf (Page 38)

fhe

following

information

is

useful for

programs

r

,

maehine

language

f)

The

Ml,

subroutine

program

counter

is

register

5.

Z) Use

only

registers

R?, RA,

RB, RC, RD,

RE,

and

RF

3)

R5.1

conti

be

"rt"""ii""tlt8olage

address of

the

variables

and

must

not

4)

fhe

display

starts

at

location

1OOO

(one

page)

5)

The'variables A-Z

start at

location

ttU?

(two'bytes

per

variable)

6)

The

aruay A

starts

as the

free

address

in

11BE

7)

The

stack

occupies

the

last

page

of

memory

and

the

low order

portion

may be

used

for storage.

(Page

address

RZ.1)

8)

The BASIC

source

program

starts

at

IZOA,

LITTLE

LOOPS

by

Tom Swan

PRII\M

TIIIIE

They

just

finished building a bul-lring

right

below

our

window

it's

painted

bright

red

and

yellow

and

orange,

and

it's the

icing on

the

cake

of our

now brown

Mexican

countryside.

Here

they

do not have bloody Spanish

bullfights

'chey

are

more like

rodeos

though

there

is far more

drinking,

taco

eati-ng,

laughing

and

shouti-ng

in

the stands than ther:e

is

action

in

the

ring.

-

This

has

absolutely

nothing to d.o

with

this

month's

column,

unl-ess

you

want

to

compare a

Mexican's interest

in rodeos with

my

interest

in

BASIC

language

programming.

Every

eouple of

weeks

they

have a

rod.eo,

then

everybody

goes

back

to

normaL. Every

once

in

a

while, I write a

program

in

BASIC

(even

on our

new

"baby"

in

the

house, a^n

APPLE

II,

I'm more

interested

in

machine

language

progiamrning.

)

Problem

is,

I seldom

go

back to

normaL.

I donlt

want

to

sound too

"ho-hum"

about

BASIC.

It

offers a

good

way

to learn

prograrnming

and

judging

from

the

number

of

read.ers

letters

and

articles

this

month,

a

lot

of

you

own

VfP Tiny BASIC

Board.s.

iHtp-8

is

also an

excellent

languige for cutting-your

programming,teeth.

Though

it

lacks

the

readability

of a

d.ocumented

BASIC

program,

it

is more

suitable

for

use

on a

VIP computer.

.

the

following

program

is

straight from

an

algorithm

(that

means

a

procedure

or

plan

for a

programming

task)

from Vol

1

of The

Art of'

Computer

Programming

by Donald E.

I(nuth

r

page

143, It

generates

a

list

of

prime

numbers

as

many

as

you

ask

for

up

to

the

limits

of

your

il€rrorlr variables size,

and

patience.

One

interesting

line

(#ttto)

gives

the

remainder

after a

division

provi.ding

the

function X

MOD Y which

is

not in

Tiny

BASIC's vocabulary.

You

may

leave the

REM's

(remarks)

out

without

affeeting

the

program

Notice that

the

little

b's

with

lines

through them

are spaees

(b).

writing

2,OB/ag,

38

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