mirror of
https://github.com/AppleWin/AppleWin.git
synced 2024-11-03 09:05:23 +00:00
56 lines
2.0 KiB
HTML
56 lines
2.0 KiB
HTML
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
|
||
|
|
<title>Copy Protected Disks</title>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
|
||
|
|
<body style="background-color: rgb(255, 255, 255); font-family: verdana;" alink="#008000" link="#008000" vlink="#008000">
|
||
|
|
|
||
|
|
<h2><font color="#008000">Copy Protected Disks</font></h2>
|
||
|
|
|
||
|
|
<hr size="4">
|
||
|
|
<p>The process of transferring disk images is complicated by the fact
|
||
|
|
that much of the software published for the Apple II was copy protected.</p>
|
||
|
|
|
||
|
|
<p>Software publishers have
|
||
|
|
always looked for
|
||
|
|
ways to prevent people from making unauthorized copies of their
|
||
|
|
software. Today, when you buy a game, it might ask you for a word
|
||
|
|
from a random page of the manual, to ensure that you have
|
||
|
|
purchased the game (complete with manual) and not just copied the
|
||
|
|
disk. Back in the days of the Apple II, publishers were much more
|
||
|
|
direct: they simply tried to make it physically impossible to
|
||
|
|
copy the disk. </p>
|
||
|
|
|
||
|
|
<p>Unlike the PC, the Apple II
|
||
|
|
had to perform
|
||
|
|
much of its disk encoding in software. If programmers wanted to
|
||
|
|
get tricky, they could bypass the operating system and do their
|
||
|
|
own encoding, possibly changing the size of the sectors on the
|
||
|
|
disk or the way in which the sectors were identified or stored.
|
||
|
|
This prevented standard operating systems like DOS, along with
|
||
|
|
their standard copying utilities, from accessing the disk. </p>
|
||
|
|
|
||
|
|
<p>However, programs which were
|
||
|
|
copy protected
|
||
|
|
in this manner could still be copied with more sophisticated
|
||
|
|
"nibble copiers", which copied each track on the disk
|
||
|
|
bit for bit, rather than copying a sector at a time. Similarly,
|
||
|
|
to get a program like this to run under AppleWin, all you need to
|
||
|
|
do is make a nibble image of the disk. </p>
|
||
|
|
|
||
|
|
<p>After nibble copiers became
|
||
|
|
prevalent on
|
||
|
|
the Apple, some software publishers developed tricky new ways of
|
||
|
|
creating disks that even nibble copiers could not copy. It is
|
||
|
|
unlikely that such a disk could be successfully transferred into
|
||
|
|
a disk image. </p>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|