Nick Westgate wrote:
On Jun 3, 2:34 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:The machine will "break" almost immediately, then you can examine the code (and data) in the region $8AFA..$8BFB and I can guarantee that you will see what it does to signature check the disk. (Of course, that means accessing the disk, so there things may get more technical.)Yes, this (!) signature check is easily circumvented. The next problem is that the disk assumes volume 255. Either that needs to be worked around, or a NIB is preferable.
Hopefully, it's not too hard to patch it to accept the default volume number...(though it's also annoying that the .dsk/.do format doesn't include a volume number or means for conveying it). I wish that emulators would scan .dsk/.do filenames for the presence of, say, ".v" followed by a volume number, followed by ".", if such a substring is in the name. This would be a simple way to provide the volume number associated with an image through "out of band" signalling. Unmodified emulators would, of course, pay no attention. Requiring use of the much less appealing .nib format to convey a single byte of information is a problem that should be addressed. -michael ******** Note new website URL ******** NadaNet and AppleCrate II for Apple II parallel computing! Home page: http://home.comcast.net/~mjmahon/ "The wastebasket is our most important design tool--and it's seriously underused."