mirror of
https://github.com/AppleWin/AppleWin.git
synced 2024-12-28 02:32:08 +00:00
54 lines
1.5 KiB
HTML
54 lines
1.5 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>Introduction to Disk Images</title>
|
|
</head>
|
|
|
|
|
|
<body style="background-color: rgb(255, 255, 255); font-family: verdana;" alink="#008000" link="#008000" vlink="#008000">
|
|
|
|
|
|
<h2 style="color: rgb(0, 128, 0);">Introduction
|
|
to Disk
|
|
Images</h2>
|
|
|
|
|
|
<hr size="4">
|
|
<p>Everyone who once used an
|
|
Apple II and now
|
|
uses an IBM-compatible PC has the same problem: How can you
|
|
make
|
|
the PC read Apple floppy disks? Unfortunately, without special
|
|
hardware, you can't. </p>
|
|
|
|
|
|
<p>Floppy disks are analog
|
|
devices, much like
|
|
cassette tapes. For a computer to store digital data on a floppy
|
|
disk, it must "encode" the data into an analog format.
|
|
The Apple II used a method of encoding called Group Code
|
|
Recording (GCR), while IBM-compatible PC's use the much more
|
|
standard Modified Frequency Modulation (MFM) encoding. Since this
|
|
is all done in hardware and cannot be bypassed, it is not
|
|
possible for a PC program to "reprogram" the floppy
|
|
drive in such a way that it could read Apple-formatted floppy diskettes. </p>
|
|
|
|
|
|
<p>Therefore, instead of reading
|
|
and writing
|
|
disks directly, AppleWin uses disk images. A disk image is a
|
|
single file, which you can store on your hard drive or on a PC
|
|
floppy diskette, which contains all of the data from an entire Apple
|
|
diskette. AppleWin treats an image exactly as if it were a real
|
|
floppy disk. </p>
|
|
|
|
|
|
</body>
|
|
</html>
|