Atari Software Protection Techniques - Alpha Systems.pdf - !Książki i datasheety - voyssgdial

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ATARI SOFTWARE PROTECTION TECHNIQUES

by George Morrison

Forward by Ed Stewart

(Author of Letterman)

AN ALPHA SYSTEMS PRODUCT

SOFTWARE PROTECTION TECHNIQUES

DISK UTILITIES

<C> COPYWRITE 1933

FROM ALPHA SYSTEMS

ATARI is a registered trademark of Atari, Inc.

Atari Software Protections Techinques Disk Utilities is a

utility package designed -for use by software writers to help

protect your software from, illegal copying. The theory is

described in the book <Atari Software Protection Techniques)

that is included in this package, but this disk utility should

help even the beginner use some of the methods described.

A menu of options will automatically appear on your screen

when the disk is loaded (with the BASIC cartridge in), or just

type RUM "DzMENU" from BASIC. Each of the utilities and options

contain instructions which appear on the screen when the program

is run. For your convenience, most of the programs are listable,

and are well documented to help you understand them. I suggest

you LIST or RUN each one to see the instructions, but type NO

when asked if you wish to execute the program. Also all the

program listings from the book are contained on this disk. For

example, Figure 4.4 from the book is called aFIG44" on the disk.

The following information will help you better understand some

of the programs on the disk

Directory Hider (called HIDER on the disk)

The directory Hider is used to help prevent DOS copies. It

is especially useful for menu driven programs, or programs which

must—epeiv- files or run other programs from the disk. The

Directory Hider hides your disk directory in a new location on

the disk. Your programs will automatically use the hidden

directory (because this program changes DOS to point to it). But

others trying to copy your programs will see 787 free sectors.

WARNING - Make a back-up of the disk you wish to protect

before running this program.

SETSCAN - This program will scan the sectors on the disk for

bad or misassigned sectors. It asks for the starting and ending

sectors you wish to scan, and then displays a message for each

sector.

SECTLOOK - This displays the contents of a sector in

character format. Just enter the sector you wish to read, and it

will be displayed on the screen.

VTOCER - This program has two parts. Option One shows you

which sectors on the disk are used and which are free (according

to the VTOC).

Option Two is used to reserve space on a disk for a hidden

directory. As indicated in the book, the directory should be

hidden in a certain range of sectors. If HIDER can't find the

space to hide your directory, a message will be displayed

telling you to run this program- Complete instructions are

displayed on the screen.

BADWRITE - This program enables you to protect your disks

with bad-sectoring. The methods used to have your program check'

for the bad sectors are explained in the book. This utility lets

you create bad sectors on your disk. There are two simple ways

to create a bad sector on a disk using only standard hardware.

This utility will do both.

Bad Sector Writer Option One requires that you slow down

your disk speed, but is much quicker than Option Two. Some types

of disk drives cannot be slowed down enough to write bad

sectors, so if yours is one of those, you must use Option Two.

USING OPTION 1. The first step in using Option 1 is to

adjust your drive speed down to 228 +-10 RPMS. Before changing

your drive speed, go to option 3 - ADJUST DRIVE SPEED. This

option will help you get your speed properly adjusted. To write

bad sectors adjust your speed to aprox. 228 +-18 RPMs. Try to

write the bad sectors at the slowest possible speed without

getting I/O errors. To get the best bad sectors, your disk

should just barely be able to write.

Adjustino Your Drive Speed

To adjust your disk drive speed, it is necessary to remove the

top cover and adjust one screw. To remove the cover, just pry

off the four little tabs on the top of the drive with any sharp

instrument. Then with a standard phi 1 lips head screwdriver,

loosen the four screws (under the tabs) that hold the cover on,

and gently lift off the cover. There are two basic types of

ATARI 818 disk drives around. The newer drives have a circuit

board across the top (see diagram "A"). The older drives have no

circuit board across the top and have a large white plastic

screw in the back left corner of the drive (see diagram "B") .

This large white screw can be turned by hand to adjust your

speed. It is ^ery sensitive so a quarter turn may be all you

need.

The newer drives are a bit trickier to adjust. To find the

speed adjustment, look for a small green box with a tiny silver

screw on it. It is located in toward the rear and a little left

of center in _Jfche_ drive. It is very smaJ_Lfeyi^carv_j3e jyAJALsied

"using a micro-screwdriver. The speed adjustment on the newer

drive is not \/ery precise. It may take as many as 8 complete

revolutions to properly adjust your speed.

The next step is to write the sectors. Use option 1 to do

this. Just enter the sectors you wish to create then press

return. After all your bad sectors are complete, return to

option 3 to adjust your speed back to normal.

USING OPTION 2

This method provides an alternate method of writing bad

sectors. I still recommend option 1 as a faster and easier

method, however if your disk drive was purchased after Jan 83,

or you own a non-Atari disk drive, you may need to use option 2.

To use this method, you must attach two long pieces of tape

(folded over onto themselves) firmly to the top of the disk you

wish to write bad sectors on (see Diagram 1). Then insert the

disk in your drive, so that the tape sticks out when the door is

closed (be sure tape is long enough to get a grip on when the

disk door is closed). Next, enter the destination disk drive

number (the disk drive you wish to write bad sectors on) and the

sector number. Then be sure everything is set and type return.

The screen will now prompt you to shake the tape. You can gently

move the tape back and forth, and alternately push on one piece

while pulling on the other. The computer will beep and signal

you when the bad sector is written. Then stop pulling while it

rechecks the sector. Note that until you get good at it, it can

take 18 minutes or more to write a single bad sector. So keep at

it, and wait for the computer to signal you that it is done. If

you wish to abort the process, hit any key.

DIAGRAM A

DIAGRAM B

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DIAGRAM 1

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