Viper 2.08 User's Guide download pdf (Page 29)

PROGRAUIMING

HINTS

by H.C,

I1UiII

IV

Record

(in

voice) on

tape,

before

each

program,

the

pr.ogran

narne,

number

of

pages

and the

place

where

documentation

and/or

directions

cart

be

found

(tfris

aids

in

the

location

and

use

of

taped

programs

and the

VIP

Monitor

overtooks

peoples

voices)..

When

debugging

CHIP-8

programs

put

a D//f

instruction

in

place

of

a current

instruction

to see if it is

being

executed. If

the

instruction is being

executed,

junk

will

appear on

the scr€€rrr

This

i-nstruction

can also

be followed

by a

"jump

to

itself"

instructi.on.

This

type of debugging aid

is helpful

when trying

to

find

out

which

instructions

are

being

executed,

if they

are

being

executed and

in what

order they

are

being

executed. It

also aids

in

finding

out

whether

"SKIP"

instructions

are

"SKIP"ing

or

not.

A

jump

to

the beginning

(or

end)

of

the

prograrn

can

also

provid.e

the

same

results.

An

even

more interesting

implementation

of

this debugging

tool

is

to

call an

assemb-l,y

language

subroutine

that

in

turn

does a

jurnp

to

the

monitor

(89f,9)

so

that

you

can

look

at

where the CHIP:-8

variables

are stored.

This

"tool"

is

referred to as a

breakpoint.

SPACE WARS SPEED

UP

by

Tom

Swan

The

following

modifications

to Space

Wars

in

PIPS

FOR VIPS I

will cause

the

phasor

fire

to

go

faster.

It

also speeds

up

the

target's ability to take evasive

action, so watch

out!

038E

1582

--

o3Bl+

I58B

osie FB oo

7A

AC

AF

o5B2 05?6

84

663F

85

Dgo

88

0576

BA

OOEE

;

Go

to

Patch

#t

r

Go

t

o

Patch

#Z

BF

FB

r

IULS

TOGGLE

subroutine

switches

0F

FB

;

CHIP,

B

interpretQr

between

D4

oo

;

h

Lgt/I

ow

speed,.

r

CALL

TOGGLE

MLS

-

switch

to

high

speed

;Patched

instrueti-on

from

phasor

sub

;

Return

from

Patch

#t

-

go

f

ire

phasors

r

CALL

TOGGLE

MLS

-

switch

to

low

speed

r

Return

from

subroutine

(

instead

of

iumping

back

2,OB/09

,

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