Re: Program Changing Disk Byte Values on a IIgs?

["Michael J. Mahon" <mjmahon@aol.com>]

Tempest wrote:
> I found my Copy II Plus disk, but I'm not sure how to go about editing
> the disk.  The file is stored on the HD, so I'm not sure if the program
> can access it.

To edit a disk *image* file, as opposed to a disk itself, you need
to block edit the file, *not* the hard disk (something to be avoided).

Even then, converting from ProDOS 5.25" disk block numbers to relative
bytes in a disk image file is potentially very error prone.  (The
instructions for disk edits that you have refer to the blocks of
a physical 5.25" disk, not to an image file.)

I'd recommend using a program (DiskMaker, DSK2FILE, etc.) to create
a real 5.25" disk from the image file, then block edit that as
prescribed, then, if you wish, re-image the patched disk.

Alternatively, run an emulator, mount the disk image, and use your
block editor on the image.

-michael

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