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a Mini vMac Extra


dc42chk-1.0.0.zip (info) a zipped hfs disk image and checksum file. The disk image can be mounted with Mini vMac. Includes source code.

DC42Chk is an application to use in Mini vMac (version 3.0.0 or later) to check that disk image files in the format used by Disk Copy 4.2 have correct checksums.

Mini vMac versions before 3.2.2 by default will mount and write to Disk Copy 4.2 images without updating the checksums, resulting in an invalid image. Mini vMac 3.2.2 and later by default will mount such images read only, but can be compiled to be able to write to such images, in which case the checksums will be updated when the image is unmounted. It does not verify the checksums before mounting. Hence this utility.

DC42Chk works similar to ImportFl. The image to check is on the host computer, not the emulated one. Upon scanning a valid image, DC42Chk will display the message : "Good - I think that is a valid Disk Copy 4.2 disk image." Otherwise some other message will be displayed indicating the problem.

See the Compiling page for instructions on compiling DC42Chk from the source code.

You can redistribute DC42Chk and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation. See the included file COPYING.

DC42Chk is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the license for more details.


If you find DC42Chk useful, please consider helping the Gryphel Project, of which it is a part.

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copyright (c) 2011 Paul C. Pratt - last update 4/22/2011