![]() You can createzeroed files in the terminal of Mac OS X,or Linux, with commands such as: dd if=/dev/zero of=my_image.dsk count=14336 Choosing 'Initialize' will makea perfectly good disk image. If you try to mount a file in Mini vMacwhich isn't a disk image (preferably allzeroes) the operating system of the emulatedmachine will ask if you want to initializeit. You can also create your own blank disk images of anysize. This canmake a difference if you use “Aliases” in System 7.The Macintosh system software can mistakenly decidethat an already mounted disk is the disk it is looking for,particularly if it has the same creation date as the correct disk.If you might encounter this problem, before using one of the blank disk imagesyou can erase it(with the “Erase Disk.” command in the Special menu of the Finder)to make sure it has a unique creation date. (The name ofthe disk which you see in the emulated machineis completely separate from the name of thedisk image file).Īnother issue is that when youmake multiple copies of these blank disk images,they will have the same creation date. Because if twodifferent mounted disks have the same name,some programs can become confused. It is a good idea to rename the disksinside the emulated machine, instead of leavingthe default name “untitled”. If you're using Mini vMac on a Macintosh, you mightwant to set the file type and creator of yournew disk image file, using“ SetFType”. (Unless therewas a major bug in Mini vMac, of course.) No matter what programyou run in the emulated machine, nothing can be harmed exceptthe disk images that are mounted at the time. This way Mini vMac givesthe same benefits of memory protection, and more. It is safer to have separatedisk images for separate purposes. (HFS Plus fixed thisproblem, but isn't supported on a Macintosh Plus.) Another reasonit is a bad idea is that a Macintosh Plus doesn't have the memoryprotection of modern computers, so that a bug in any programcan potentially corrupt mounted disks. So the minimum block size increases forlarger disks, meaning more wasted space. One reason is that the HFS file system is limited to a maximumof 65535 allocation blocks. If you're thinking of using large disk images, keep in mindthat it is not a good idea to create one giant disk image forall your work. (All the other disk images in Blanks are“raw”, containing just image data with no headeror trailer.)Mini vMac can supportfile tags with the build system option “ -sony-tag 1”,and can support checksums with the build system option“ -sony-sum 1”. The “dc42” folder contains disk images withthe Disk Copy 4.2 header, and having filetags and checksums. The original Macintosh 128K and 512K can only use MFSand not HFS. The “mfs” folder contains disk images in theMFS format (Macintosh File System).All the other disk images in Blanks are in “HFS” format (Hierarchical File System), the standard for a Macintosh Plus.MFS preceded HFS. In general, it may not a good idea touse the largest sizes, for reasons described below. The “M” folder contains disk images larger or equal to1 megabyte, up to 224M. The “K” folder contains disk images smaller than 1 megabyte,in powers of 2 starting at 128K (the smallest that works),and also multiples 1.25, 1.50, and 1.75 of those powers. But Mini vMac doesn'temulate the real floppy drive, replacing the disk driverin ROM, and so can use any size disk image, not just 400K and 800K. A real Macintosh Plus floppy drive could use 400K disks,but not 1440K, which came later. The top level of the blanks folder contains 2 other disk imagesin the sizes of standard Macintosh floppy disks: 400K and1440K. For example, unzip “800K.zip”to get “800K.dsk”, an 800K blank disk image, the size ofa floppy disk normally used by a real Macintosh Plus.įor information about using disk images in Mini vMac,see the ' Floppy Drive'section of the Hardware Reference.To transfer files from your realcomputer into and out of disk image files, see the utilities ImportFl and ExportFl. Product type OS Vendor Apple Release date 1994 Minimum CPU 68000/601 User interface GUI Platform MacOS Download count 76 (31 for release) Downloads Download nameĪpple Mac OS 7.5 (''Capone'' 7.5.5C3) (3.5-1.44mb)Īpple Mac OS 7.5 (''Mozart'' 7.5.B2C2) (1994) (beta) (ISO)Īpple Mac OS 7.5 (ISO)Īpple Mac OS 7.5 (ISO)Īpple Mac OS 7.5.1 (ISO)Īpple Mac OS 7.5.3 (''Unity'' 7.5.3.A3C3 A) (SIT)Īpple Mac OS 7.5.3 Revision 2 (3.5-1.44mb)Īpple Mac OS 7.5.3 (ISO)Īpple Mac OS 7.5.3 (HD Image)Īpple Mac OS 7.5.3 (Bad?)Īpple Mac OS 7.5.3 (HD Image)Īpple Mac OS 7.5.“blanks-1.1.zip” is a zip archive containing a folderof zipped empty Macintosh disk image files of various sizes and formats.įirst unzip “blanks-1.1.zip” to get the folder“blanks”.Then when you need a blank disk image, unzip one of the filesin this folder. ![]()
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