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7.8 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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<title> Blanks </title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="canonical" href="index.html">
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</head>
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<body>
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<div>
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<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../../index.html">minivmac</a>/<a href="../index.html">extras</a>/blanks
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- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
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</div>
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<hr>
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<h2 align=center>
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Blanks
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</h2>
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<hr>
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<p> Download </p>
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<blockquote>
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<p> <a href="https://www.gryphel.com/d/minivmac/extras/blanks/blanks-1.0.0.zip">blanks-1.0.0.zip</a>
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(52K) </p>
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</blockquote>
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<p>
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“blanks-1.0.0.zip” is a zip archive containing a folder
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of zipped empty Macintosh disk image files of various sizes and formats.
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</p>
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<p>
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First unzip “blanks-1.0.0.zip” to get the folder
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“blanks”.
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Then when you need a blank disk image, unzip one of the files
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in this folder. For example, unzip “800K.zip”
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to get “800K.dsk”, an 800K blank disk image, the size of
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a floppy disk normally used by a real Macintosh Plus.
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</p>
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<p> For information about using disk images in Mini vMac,
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see the '<a href="../../hardware.html#floppy_drives">Floppy Drive</a>'
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section of the Hardware Reference.
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To transfer files from your real
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computer into and out of disk image files, see the utilities
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<a href="../importfl/index.html">ImportFl</a> and
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<a href="../exportfl/index.html">ExportFl</a>.
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</p>
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<p> The top level of the blanks folder contains 2 other disk images
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in the sizes of standard Macintosh floppy disks: 400K and
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1440K. A real Macintosh Plus floppy drive could use 400K disks,
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but not 1440K, which came later. But Mini vMac doesn't
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emulate the real floppy drive, replacing the disk driver
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in ROM, and so can use any size disk image, not just 400K and 800K. </p>
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<p> The “K” folder contains disk images smaller than 1 megabyte,
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in powers of 2 starting at 128K (the smallest that works),
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and also multiples 1.25, 1.50, and 1.75 of those powers. </p>
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<p> The “M” folder contains disk images larger or equal to
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1 megabyte, up to 224M. In general, it may not a good idea to
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use the largest sizes, for reasons described below. </p>
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<p>
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The “mfs” folder contains disk images in the
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MFS format (Macintosh File System).
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All the other disk images in Blanks are in “HFS” format
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(Hierarchical File System), the standard for a Macintosh Plus.
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MFS preceded HFS. The original Macintosh 128K and 512K can only use MFS
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and not HFS. A Macintosh Plus can use either.
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</p>
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<p> The “dc42” folder contains disk images with
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the Disk Copy 4.2 header, and having file
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tags and checksums. (All the other disk images in Blanks are
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“raw”, containing just image data with no header
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or trailer.)
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Mini vMac can support
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file tags with the build system option
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“<a href="../../options.html#option_sony_tag">-sony-tag 1</a>”,
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and can support checksums with the build system option
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“<a href="../../options.html#option_sony_sum">-sony-sum 1</a>”. </p>
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<p> If you're thinking of using large disk images, keep in mind
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that it is not a good idea to create one giant disk image for
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all your work. One reason is that the HFS file system is limited to a maximum
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of 65535 allocation blocks. So the minimum block size increases for
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larger disks, meaning more wasted space. (HFS Plus fixed this
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problem, but isn't supported on a Macintosh Plus.) Another reason
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it is bad idea is that a Macintosh Plus doesn't have the memory
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protection of modern computers, so that a bug in any program
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can potentially corrupt mounted disks. It is safer to have separate
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disk images for separate purposes. This way Mini vMac gives
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the same benefits of memory protection, and more. No matter what program
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you run in the emulated machine, nothing can be harmed except
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the disk images that are mounted at the time. (Unless there
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was a major bug in Mini vMac, of course.) </p>
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<p> If you're using Mini vMac on a Macintosh, you might
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want to set the file type and creator of your
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new disk image file, using
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“<a href="../setftype/index.html">SetFType</a>”.
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</p>
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<p> It is a good idea to rename the disks
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inside the emulated machine, instead of leaving
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the default name “untitled”. Because if two
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different mounted disks have the same name,
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some programs can become confused. (The name of
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the disk which you see in the emulated machine
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is completely separate from the name of the
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disk image file). </p>
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<p> Another issue is that when you
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make multiple copies of these blank disk images,
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they will have the same creation date. This can
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make a difference if you use “Aliases” in System 7.
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The Macintosh system software can mistakenly decide
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that an already mounted disk is the disk it is looking for,
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particularly if it has the same creation date as the correct disk.
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If you might encounter this problem, before using one of the blank disk images
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you can erase it
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(with the “Erase Disk...” command in the Special menu of the Finder)
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to make sure it has a unique creation date. </p>
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<p> You can also create your own blank disk images of any
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size. If you try to mount a file in Mini vMac
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which isn't a disk image (preferably all
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zeroes) the operating system of the emulated
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machine will ask if you want to initialize
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it. Choosing 'Initialize' will make
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a perfectly good disk image. You can create
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zeroed files in the terminal of Mac OS X,
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or Linux, with commands such as: </p>
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<pre>
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dd if=/dev/zero of=my_image.dsk count=14336
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</pre>
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<p> This creates a 7 Megabyte file, named 'my_image.dsk',
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in the current directory. 'count'
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is the number of 512 byte blocks. </p>
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<p> For Microsoft Windows, it is
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<a href="http://sourceforge.net/forum/forum.php?thread_id=1901083&forum_id=68723">reported</a>
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that the command line utility
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<a href="http://www.emulators.com/download.htm#UTILITIES">MAKEDSK</a>
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will make zero-filled files. The same archive also contains
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MAKEIMG which generates formatted disk images. However, according
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to Disk First Aid and Norton Utilities, the disk images it generates
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are not quite in standard HFS format, so it may be safer just to
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use MAKEDSK, and let Mac OS in the emulated computer do the formatting. </p>
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<p> If you create a zeroed disk image file on a Macintosh,
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and wish to set the file type and creator with
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<a href="../setftype/index.html">SetFType</a>, you should
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first mount the zeroed file in Mini vMac to initialize
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it, unmount it, and then use SetFType. If you use
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SetFType before initializing the file, it won't
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know that the file is supposed to be a disk image. </p>
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<p>
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Here is the md5 checksum for the download, signed with
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<a href="https://www.gryphel.com/c/keys/k5.html">Gryphel Key 5</a>:
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</p>
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<blockquote>
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<pre>
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--------- GRY SIGNED TEXT ---------
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f78c53f9e86c6061873fd98adcd241b8 blanks-1.0.0.zip
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------- BEGIN GRY SIGNATURE -------
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Gry/4Xa8CFcUzxdN/IB38d7nDSuDT9lxjw08hoB+Vz6ZqMoP/ZlCYeD9dnz7LJ0x
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vD0hYY5XP1vl3XIM/uaAeduoT3vTTIC4mdf7NDZ3YYCgXUrhR9dH8qeetY0KTjxI
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E+4K/mOQN6/4I0noT+edEnsebC0hZTYzOAesFwohb2hYyZDS2oCffisVJ4YQXCU0
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-------- END GRY SIGNATURE --------
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</pre>
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</blockquote>
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<p> : </p>
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<p> If you find Blanks useful, please consider
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<a href="https://www.gryphel.com/c/help/index.html">helping the Gryphel Project</A>,
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of which it is a part. </p>
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<a href="https://www.gryphel.com/index.html">
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<img src="https://www.gryphel.com/d/gryphel-32.gif" width=32 height=32 border=0
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alt="gryphel logo, 1K"
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>
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</a>
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<hr>
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<div>
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<i> <a href="https://www.gryphel.com/index.html">www.gryphel.com</a>/c/<a href="../../index.html">minivmac</a>/<a href="../index.html">extras</a>/blanks
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- <a href="https://www.gryphel.com/c/feedback.html">feedback</a> </i>
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<br>
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copyright (c) 2010 Paul C. Pratt - last update 10/21/2010
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</div>
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</body>
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</html>
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