Viper 2.08 User's Guide download pdf (Page 39)

But

what

lf

you

don't have

the BASIC board?

In

that case

you

will

nscd

to

progran

in

either 1802

machine

language

or

CIIIP-8

probably.

In

fact'

that

brlnge

ne

to the

point

I would

llke

to

make. There

arc

tont

of BASIC

programs

out

"there"

and only a

few klLos

of

CHIP-8

prograns

(we're

doing

our best

to

change

that).

.Because

BASIC

ls fairly easy

to

read

and.

understand,

even if

you

don't

have

the board,

you

should try

to

pick

apart

a

few

BASIC

programs.

One thlng that

may

surprise

you

is how easily

a

BASIC

listing

tranel,ates

into

CHIP-8|

At

first

this

may

seem to be awkward,

eepecially

if

CHfp-8

j.s

new

to

your

Here

are

a

few

suggestions

to

help.

BASIC

-

PRINT

CHIP-8-

Printing

numbers

is not

difficult but

words

are

another thing.

Those of

you

with PIPS FOR VIPS

Vol-

I

can use

Messager

to translate

PRINT

statements

to

CHIP-8.

Otherrlrrise

just

leave

the

PRINT lines

out

or

simplify them

graphically

using DXYIII instructj-ons.

BASIC

-

Less

apd

greater

thal

cHrP-B-

VF:-:-33"tli'iil:*i::J:

;::';u:tt";

Ti.rTnSl

J33l*r""

(x:Y).

BASIC

-

Subscripted

variables

(e.g.

A(N))

CHIP-8-

Define

a

memory.area.to

hold

the aruay

of

nr:mbers

ti:ii:ll:i:

$i'I,ffi}'

"#

3?l:ixii*H?i;?ii:,

instruction

which

sets

Yi

=

A(N)

Insert

Y/

=

VX into

A(N)

*tiil-toSS

instruction,

BASIC

-

MuLtiply and divide

CHIP-8-

\rlpite-

sirbroutines

in CHIP-8

or

machine

language

for

these

functions.

l^lith

these

four suggestions

and

your

VIP

manual,

you

should be

able

to convert

PRIME

IIME to CHIP-8. One

problem

still

remains,

however'

When

you

PRINT

something

in BASIC, everything

else

scrol-ls

gP

to

naEe room for the

new line.

That

is not.so

easy

to

simulate

in CHIP-8,

so

next

month I suppose I

have

my work

cut-

out

for

me!

Good

luckl

PROJECfS

r

1) Convert

PRIIUE

IIME to

CHIP-8.

il

Speed

up

the

BASIC

LISTING

by

using TVON, TVOFF

instructions.

After

all

primes

have been calculated,

print

out

a

neatly formatted

list

from

the

amay

(A(N)

instead

of one

at

a time.

z,08/09

,

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