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54 lines
1.5 KiB
HTML
54 lines
1.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<title>Introduction to Disk Images</title>
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</head>
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<body style="background-color: rgb(255, 255, 255); font-family: verdana;" alink="#008000" link="#008000" vlink="#008000">
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<h2 style="color: rgb(0, 128, 0);">Introduction
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to Disk
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Images</h2>
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<hr size="4">
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<p>Everyone who once used an
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Apple II and now
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uses an IBM-compatible PC has the same problem: How can you
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make
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the PC read Apple floppy disks? Unfortunately, without special
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hardware, you can't. </p>
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<p>Floppy disks are analog
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devices, much like
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cassette tapes. For a computer to store digital data on a floppy
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disk, it must "encode" the data into an analog format.
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The Apple II used a method of encoding called Group Code
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Recording (GCR), while IBM-compatible PC's use the much more
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standard Modified Frequency Modulation (MFM) encoding. Since this
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is all done in hardware and cannot be bypassed, it is not
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possible for a PC program to "reprogram" the floppy
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drive in such a way that it could read Apple-formatted floppy diskettes. </p>
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<p>Therefore, instead of reading
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and writing
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disks directly, AppleWin uses disk images. A disk image is a
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single file, which you can store on your hard drive or on a PC
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floppy diskette, which contains all of the data from an entire Apple
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diskette. AppleWin treats an image exactly as if it were a real
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floppy disk. </p>
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</body>
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</html>
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