Multimac 1260 User Manual download pdf (Page 23)

ADAPTING AN aD-COLUMN CARD TO

WIZARDRY

'-'by

Steven

Pearce

Several

months

ago

I purchased the first Wizardry disk

("Proving Grounds

the Mad Overlord"), after hearing what a

great game it

is.

The

fIrSt

thing 1 found

was

that

did

not

properly use the 80-column card

/Ie.

It turned the 80-

column card on, but then did not use the auxiliary

memory.

The

result

was

40 columns

80-column

mode.

After doing

some

reading, I

found

the

reason

for

this. The program

uses

the

"Run-time" Apple Pascal operating system. This

abbreviated version

Apple Pascal

1.1

designed to be

used

machines with only 48K of

RAM

(i.e.

Apple ][ "minus").

This system would let anyone with

Apple

computer (even

without the

16K

RAM

card) play the game. Normally, Apple

Pascal requires

64K

RAM.

The problem occurs because

the

operating system "turns

on"

80-column card but

does

not

use

it. With a Videx Videoterm,

there

no output

the

screen at all unless the card

physically removed. Since

the

disk

copy-protected, it can't (easily) be moved to the

standard Pascal

system.

The solution to the problem

patch the operating

system so that it won't find

80-column card (you only need

40 columns

play the game). Bill Cook (alternate SYSOP

76703,1030) on CompuServe, came

with

this patch: "Use

a disk utility

to search

the

boot disk for the following

'-"

sequence of

bytes:

38.

Change

the

fIrSt

either 00 or FF (actually

any

value will

but

there

are

some

new,

strange signature bytes out there

and

don't

know

them all, but 00 and FF can't be used).

the

board

still

turns

then

change

the

last18

well."

The sequence

bytes

found

block

167

the

boot

side, starting

with

byte number 218. This

occurs

the

file

WBV2.l:RTSTRP.APPLE. To make

the

process automatic,

1 wrote a program (listed below) which will

the

patch. 1

assume that

the

user either

has

the Apple Pascal operating

system, or

has

access

First, make a copy

the

Wizardry disk using

any

the

standard bit-copy prograrns

used

Copy ][ Plus). Type

and

compile

the

program, then

insert the Wizardry disk

one

the disk drives and

run

the

program. The

fIrSt

byte

will

be changed

there

are

still

problems,

run

the

program again

and

the

second

byte

will

changed. Remember that the boot side or the

disk must have a write-protect

tab on it. Part

the

copy-protection scheme

used

Wizardry

checks

see

the

disk

write-protected

and

crashes

it isn't

Wizardry disk

works

fine

40-columns

now.

PROGRAM

WIZ

PATCH;

TYPE

BYTE

.. 0

255;

VAR

F:FILE;

BUFFER:PACKED

ARRAY

511]

BYTE;

BLOCK,BLOCK

XFER:INTEGER;

'-"

BEGIN

WRlTELN(CHR(12»;

WRITELN(,INSERT

WIZARDRY

DISK.

REMOVE

WRITE-PROTECT

TAB

FIRST.');

WRITELN;

WRITE('PRESS

RETURN

WHEN

READY.');

READLN';

{$I-}

RESET(F,WBV2.1:RTSTRP.APPLE);

IORESUL

<>0

TIffiN

BEGIN

WRITELN('INSERT

FLIP

SIDE

AND

TRY

AGAIN.');

EXlT(PROGRAM);

END;

{$I+}

BLOCK

XFER:=BLOCKREAD(F,BUFFER,I,18);

BUFFER[218]

<>0

TIlEN

BEGIN

BUFFER[218]:=0;

WRITELN('IF

8O-COLUMN

CARD

STILL

GETS

TURNED

ON,

RUN

TIllS

PROGRAM

AGAIN.'};

END

ELSE

BUFFER

[222]:=0;

BLOCK

XFER:=BLOCKWRITE(F,BUFFER,I,18);

CLOSE(F,LOCK);

WRITELN('DONE.');

END.

APPLE TEAS

Amy

Billingsley

Washington Apple Pi

Apple Tea

Wednesday, February

19,

7 - 9

501 Hawkesbury Lane •

Silver Spring,

MD 20904

Would

you

have a Question & Answer session

those so helpful at our monthly meetings, only

a smaller

setting

within

home

atmosphere,

with

refreshments?

R.S.V.P.

above address or 622-2203

(be

prepared

leave message). Mention what

you

would like

discuss

and

what you're interested

learning

about, what your

expertise

is,

and

what software

you

are using.

Also,

you

can't

make

this Tea, would

you

interested

one another

time?

Would

you

willing

host

Apple Tea

your

home.

• Directions: Take

Route

495

New

Hampshire

Avenue

North

exit.

Drive 4

miles

Randolph

Road.

Tum

left.

Drive

1st

traffic light, Locksley Lane,

and

tum

right.

Drive

112

mile

elementary school (Hawkesbury Lane).

Tum left.

501

1st house, righthand side,

comer after

Whittingham

Drive. @

Washington

Apple

February

1986

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 75 76

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