Viper 2.08 User's Guide download pdf (Page 12)

Changlng the

error-trap

to

provide

a

dynamic,

r4ther

than static,

display can

reveal

"iffy"

address

lines.

fhis

change flashes

the

error

location

continuously"

and the

tone

is suppressed since

havlng hardware

problems

is

annoying

enoughl

oo6c

o? FB Fr

30

6c

(rast

byte @

oo?1)

In

ny

case, this

revealed nultiple

simultaneous access

within

the

1K under

test

I

it can be determj.ned from

the screen

which IVIA

lines

are

fadlty.

Not trapping

errors is

also

us'eful

in

observing

overall behavior

in

the

tK

under

testr

x€v€Bling

faulty

add,ress

linesr,

un-€h&bled

chlpsr oF

chips not

write-enabled'

or

which fail to

respond

to

signals. These

failures

are

observed

as

vertical solid

lines

coiresponding

to

the bit-width

of

the

chip

(4

uits

tor

2714s,

I

for 21O1sr

etc.)

for

enable

problems.

Dead

address

lines

will

show as

horizontal lines;

a combination

of enable

and

address

problems

will

show as

squares

or

cross-hatch. To disable

the

trap, change 0054

to

'38'.

Fortunately, my

board

is rururing

nicely,

thank

youi

with the

ex-

ception of

t-2114

with

a bad

bit,

all

problems

were

bad connections'

either

sold.eredr or the

more

insidious

pin-to-socket

contact"

-

P. V. Piescik, Cuddly

Software

A

LETIER

TO PIPS

ITI

OWNERS

from

Tom

Swan

Welt,

it's humble

pie

time.

ltrlhen

I

wrote the

Reversi type

game

VIP-FLOP

for

PIPS

FOn VfpS III,

I

thoueht

I

knew

how to-pfaf tfre

game.

I

have

a

good

friend

who used

to teIl

me,

"Tom,

!flgl

assume

that

you

lorow anything."

(Roy

--

you

were

rigfrt-Eg4ln.)

Not

having the

box

version

down here

in Burro

Land, I

relied

on

a

sketchy

Creative

Computing

article

and

one

match

played

at a

computer

show as

the basis for

the

game

rules.

As

many

of

you

have

rightly

pointed

out,

I made

one

lovely

boo-boo.

My head

hangs

d.own

in'sharne and

I

print

here

one of Terry

laudereau's

farnous

"sighhhh's

"

a

long'n

.

My

mistake

was

to assume

that moves

only need

to be ad.iacent to

any

piece

in

order

to be counted

as

Iegal.

The correct

rules

require

that at

least

one

opponent

piece

be

flipped

for the

nove

to

be legal.

When

there are no 1ega1 moves

possible,

the

player

must

forfeit

the turn.

Now

for

the

good

n€ws.

CARMELO CORTES

TO

THE RESCIIE

!

(con't)

2,OB/O7,A2

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